WO2021119793A1 - Control method and system for single-phase converter and single-phase converter - Google Patents
Control method and system for single-phase converter and single-phase converter Download PDFInfo
- Publication number
- WO2021119793A1 WO2021119793A1 PCT/BR2020/050571 BR2020050571W WO2021119793A1 WO 2021119793 A1 WO2021119793 A1 WO 2021119793A1 BR 2020050571 W BR2020050571 W BR 2020050571W WO 2021119793 A1 WO2021119793 A1 WO 2021119793A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- phase
- phase converter
- converter
- load
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4837—Flying capacitor converters
Definitions
- the present invention refers to a control system and method for a single-phase converter, which is implemented mainly, but not exclusively, by means of a drainage or injection of current signals containing odd harmonics with phase preferably of 0o in AC port, and based on an improved automatic power decoupling, aiming to perform a single-phase power factor correction, increase the life cycle of the converter and also increase its reliability.
- the present invention further relates to a single-phase converter compatible with said control system and method.
- the US patent No. US8102165B2 is related to a power factor correction circuit (PFC) that includes an inductor, a diode, a storage capacitor, a switch and a control unit, configured so that a variation of energy absorbed and released by the storage capacitor is smaller, allowing its capacitance to be significantly reduced.
- PFC power factor correction circuit
- this document describes a solution with two cascade converters, being a PFC circuit and a CC-CC converter.
- the controller used in the PFC circuit proposed in this document is conventional, that is, equipped with an input current loop and an output voltage loop.
- This solution disadvantageously presents a large voltage ripple across the output capacitor, in addition to a current containing third, fifth and seventh harmonics.
- the control circuit described herein comprises a plurality of smaller circuits and the converter is configured to allow to control a lower rms value of ripple current of an electrolytic capacitor of the converter.
- United States Patent No. US9300217B2 discloses an AC/DC converter including an output capacitor with a small capacitance and a long service life, using a surge current eliminator with a feedback control. simple tension.
- This solution also features the aforementioned ripple eliminator circuit (or active DC filter).
- This is a bidirectional converter, which can be buck, boost, buck-boost, etc., configured to inject and absorb current from the PFC converter's DC bus, having a capacitor configured to process the reactive power.
- An objective of the present invention is to provide a control system and method so that the drained odd harmonics of the AC gate preferably contain 0o phase.
- An objective of the present invention is to provide a system and method configured to reduce an output voltage ripple and converter capacitance requirement.
- An objective of the present invention is to provide a system and method configured so that the third harmonics preferably present a 0o phase.
- An objective of the present invention is to provide a single-phase converter.
- the objectives of the present invention are achieved through a control system for a single-phase converter, connected to an electrical network, which connects to two different buses: BI connected to a capacitor Cl, which is configured to be in parallel to a load Ro and whose voltage is constant; and B2 connected in parallel to another capacitor C2, whose objective is to absorb the ripples of active power coming from the single-phase electrical network.
- the objectives of the present invention are achieved by means of a control system that allows removing the voltage ripples from the Bl bus, transferring them to the B2 bus, allowing the decoupling of the power ripples between the AC port and the bus B1, with the use of the EAPD preferably.
- Figure 1 - is a state of the art Theta converter
- Figure 2 - is a buck-boost converter of two switches of the prior art
- Figure 3 - is a buck-boost converter of a switch and variable frequency of the prior art
- Figure 4 - is a graph comparing the state of the art (dashed line) and the present invention (continuous line), exemplifying a relationship between maximum voltage in a DC bus and capacitance of said DC bus.
- Figure 5 - is a table exemplifying a relationship between harmonic values drained from the network and a capacitance of a required capacitor, according to the teachings of the present invention
- Figure 6 - is a control loop according to the present invention.
- Figure 7a - is a representation of the amplitude of a third harmonic in a solid line and the dashed line represents the amplitude of a fifth harmonic drained from the current of the single-phase network;
- Figure 7b - is a comparative chart, in which the dashed line represents the amplitude of the voltage ripple across the capacitor using a sine wave and the solid line represents the ripple reduced with the implementation of the present invention.
- Figure 8 - represents a first topological state according to the teachings of the present invention.
- Figure 9 - represents a second topological state in accordance with the teachings of the present invention.
- Figure 10 - represents a third topological state in accordance with the teachings of the present invention.
- Figure 11 represents a fourth topological state in accordance with the teachings of the present invention.
- Figure 12 - is a block diagram in accordance with the teachings of the present invention.
- the present invention is based on the fact that a capacitor can be designed for a lower power and provide the same voltage ripple at rated power through the use of current harmonics.
- the present invention refers to a control system 1 for single-phase converter 2, for example, preferably theta type.
- a control system 1 for single-phase converter 2 for example, preferably theta type.
- other converters can play a similar role as, for example, the two-switch buck-boost converter or with a switch and variable switching frequency, as exemplified in figures 1 to 3.
- the converter 2 used is configured to work in at least one of the AC-DC and CC-AC directions.
- the characteristics described will preferably relate to an operation in the AC-DC direction, but can be adapted to a DC-AC direction, that is, for operation as an inverter.
- Said control system 1 object of the present invention is compatible with a specific control loop such as that illustrated in figure 6, in which system 1 comprises at least two buses B1, B2 electrically connected to a first capacitor Cl, to a second capacitor C2 and to a single-phase network.
- capacitors are preferably of the film type, as they have a longer service life.
- these components can alternatively be ceramic capacitors, for example.
- the buses B1, B2 are electrically connected respectively to the load and to a capacitor for decoupling of active power.
- the converter of the present invention is configured to have two arms, one rectifying and one neutral.
- the first capacitor Cl is configured to be in parallel with a load Ro, wherein said load Ro can be understood as any equipment or apparatus that requires a supply such as the voltage of the first capacitor Cl.
- the second capacitor C2 is configured to be connected to a load, in which this load is zero or almost zero. In other words, it must be understood that the second capacitor C2 is not connected to any load or that the load is negligible in relation to the load that is connected to bus Bl. Examples of a near zero load include: auxiliary power supply, power circuit capacitor discharge and/or voltage sensing circuit. Thus, this second capacitor C2 is configured in such a way that its voltage can fluctuate freely, so that a voltage ripple over this capacitor is high.
- a high voltage oscillation can be understood as 70% of the rms voltage on the side of the C.A. gate, for example.
- the system object of the present invention further comprises an improved automatic power decoupling module (EAPD). More specifically, the present system is configured to perform a decoupling of AC current and voltage control actions on the buses CC, for example through the use of the EAPD.
- EAPD automatic power decoupling module
- EAPD comprises only one possible configuration of the present invention, so that other components can also be used to achieve the proposed objectives.
- this specific module is preferably configured by means of at least one of a proportional-type controller and a proportional-integral controller, so that a ripple of active power absorbed from the single-phase network is injected on the second capacitor C2.
- This ripple of active power absorbed from the single-phase network and injected into the second capacitor C2 contains odd harmonics with 0o phase, preferably.
- system 1 is configured by draining current from the mains containing odd harmonics (single-phase mains signal) in which the EAPD enhanced automatic power decoupling module is configured with enough bandwidth to allow all harmonics from a reference signal can be reproduced in a current signal.
- the EAPD improved automatic power decoupling module allows to use an integral proportional or proportional controller for insertion of such harmonics, provided that the passband of such controllers is significantly greater than the harmonic to be drained from the electrical network.
- the EAPD enhanced automatic energy decoupling module is configured so that all the absorbed power ripple of the single-phase network is injected into the second capacitor C2, such that the voltage ripple over the even be high as already described.
- the EAPD enhanced automatic energy decoupling module avoids the use of resonant and repetitive controllers.
- the relationship between the capacitance value and the harmonics drained or injected into the network can be determined as follows.
- ⁇ g is the angular frequency of the single-phase network and ⁇ n represents the phase of the harmonic n in relation to the current fundamental.
- Pg is the instantaneous power drawn from the network
- p L is the reactive power exchanged with the inductor on the AC port side
- p cc is the power delivered to the converter's BI bus.
- the maximum voltage on the second capacitor C2 is:
- the capacitance of the second capacitor C2 is:
- figure 5 presents a summary of the numerical calculations.
- the voltage of the second capacitor C2 was considered to oscillate between 750 and 1000V.
- the values presented should be understood only as examples of a possible configuration of the present invention, that is, they are not limitations for it, so that other values such as, for example, those in Figure 5 can be used so that the proposed objectives are also reached.
- the relationship between values of harmonics drained from the network and a capacitance of a required capacitor is exemplified in figure 4.
- Equation X
- Equation Y Equation Y:
- Equation X allows finding:
- control can be designed in a conventional way to meet accommodation time, over-signal, etc. requirements.
- the present invention does not use resonant or repetitive controllers, being simple the design of the current controller in the AC side inductor (Lg) to follow a non-sinusoidal current reference.
- FIG. 6 An example of a control diagram referring to the system object of the present invention is shown mainly in figure 6.
- the present invention further comprises a control method for single-phase converter 2, in which the This method is compatible with the system described above and consists of at least two buses B1, B2 electrically connected to a first capacitor Cl, a second capacitor C2 and a single-phase network.
- One step of the present method comprises connecting the first capacitor Cl in parallel with a charge Ro.
- the charge Ro can be understood as any equipment or apparatus that requires a supply such as the voltage of the first capacitor Cl.
- a step of the present method further comprises connecting the second capacitor C2 to a charge, zero or almost zero.
- the second capacitor C2 is connected to no load.
- this step takes place in the sense that the second capacitor C2 is configured so that its voltage can oscillate freely, so that the amplitude of the voltage ripple over this capacitor C2 is high.
- Another step of the proposed method comprises absorbing a ripple of active power from the single-phase network, which is followed by a step of injecting the ripple of active power absorbed in the second capacitor C2.
- These steps are performed through an EAPD enhanced automatic energy decoupling module, which has already been described in detail.
- the characteristics of the EAPD enhanced automatic energy dissociation module described herein for the system object of the present invention also apply to the method proposed herein.
- the steps of absorbing the activated power ripple in the single-phase network and injecting said ripple in the second capacitor C2 are configured so that the current ripple on the AC side contains odd harmonics, preferably with 0o phase.
- the EAPD enhanced automatic energy voltage decoupling module is configured as previously described. Briefly, this is configured with enough passband to allow all harmonics of a reference signal to be reproduced in the current on the AC side.
- the proposed method comprises a step of introducing odd harmonics, preferably with 0o phase in the reference signal.
- the present invention further comprises a single-phase converter 2 comprising at least two buses Bl, B2 electrically connected to a first capacitor Cl, to a second capacitor C2 configured such as the system and method also objects of the present invention and compatible with these, which have already been described previously.
- Example 1 [0098] Considering a prior art solution, the capacitor is designed so that between 548W and lkW the voltage ripple in the decoupling capacitor is around 100V.
- the converter operates with power factor approximately 1 at power less than 548W.
- the voltage ripple across the capacitor at rated power (lkW) using sine wave is 156.6V.
- the control method object of the present invention also contemplates an adaptive insertion module of harmonic currents in the reference signal for the AC gate current controller.
- This module allows to increase the amplitude of harmonic currents with the increase of the power drained by the load , so that, with the increase in the output power of the converter, the greater the amplitude of the odd harmonic currents drained from the electrical network.
- the adaptive harmonic current insertion module generates the portion of the reference signal for the AC side current that contains the harmonics, so that the amplitude of the harmonic currents grows with increasing output power.
- Figures 7a and 7b show the preferred embodiment of the adaptive insertion module for harmonic currents.
- the present invention therefore allows an increase in the life of the converter associated with the elimination of the electrolytic capacitor.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a control method and system for a single-phase converter (2), implemented through at least two buses (BI, B2) electrically connected to a first capacitor (C1), to a second capacitor (C2) and to a single-phase network, in which the present invention is implemented mainly by draining current from the electrical network containing odd harmonics and inserting such harmonics in a reference signal of the AC current controller, aiming to perform a single-phase power factor correction, increase the life cycle of the converter (2) and also increase its reliability. The present invention also relates to a single-phase converter (2) compatible with the control method and system of the present invention.
Description
"SISTEMA E MÉTODO DE CONTROLE PARA CONVERSOR MONOFÁSICO E CONVERSOR MONOFÁSICO" "CONTROL SYSTEM AND METHOD FOR SINGLE-PHASE CONVERTER AND SINGLE-PHASE CONVERTER"
[001] A presente invenção refere-se a um sistema e método de controle para conversor monofásico, a qual é implementada principalmente, porém não exclusivamente, por meio de uma drenagem ou injeção de sinais de corrente contendo harmónicos impares com fase preferencialmente de 0º na porta C.A., e com base em um desacoplamento de potência automático melhorado, visando realizar uma correção de fator de potência monofásico, aumentar o ciclo de vida do conversor e aumentar também sua confiabilidade. A presente invenção refere-se ainda a um conversor monofásico compatível com o dito sistema e método de controle. [001] The present invention refers to a control system and method for a single-phase converter, which is implemented mainly, but not exclusively, by means of a drainage or injection of current signals containing odd harmonics with phase preferably of 0º in AC port, and based on an improved automatic power decoupling, aiming to perform a single-phase power factor correction, increase the life cycle of the converter and also increase its reliability. The present invention further relates to a single-phase converter compatible with said control system and method.
Descrição do Estado da Técnica Description of the State of the Art
[002] Atualmente, quando se trata de sistemas e métodos configurados para realizar um controle de conversor monofásico, algumas soluções são conhecidas no estado da técnica. [002] Currently, when it comes to systems and methods configured to perform a single-phase converter control, some solutions are known in the state of the art.
[003] As soluções convencionais para correção de fator de potência em conversores monofásicos estão baseadas no uso de um capacitor de elevada capacitância cujo propósito é o armazenamento de energia necessário ao desacoplamento da ondulação de potência instantânea entre portas CA e CC. [003] Conventional solutions for power factor correction in single-phase converters are based on the use of a high capacitance capacitor whose purpose is the energy storage necessary for decoupling the instantaneous power ripple between AC and DC ports.
[004]Estas soluções apresentam diversas desvantagens dentre as quais pode-se destacar principalmente uma grande ondulação de tensão em um capacitor de saída e correntes do lado CA contendo fases que aumentam a ondulação de tensão neste capacitor. [004] These solutions have several disadvantages among which we can highlight mainly a large voltage ripple in an output capacitor and currents on the AC side containing phases that increase the voltage ripple in this capacitor.
[005]Além disso, há soluções configuradas de modo que apresentam circuitos eliminadores de ondulação de tensão que, por meio de conversores bidirecionais comuns e
independentes tais como o conversor buck, boost ou buck- boost, injetam correntes com componentes específicos para processar potências reativas do circuito. [005] In addition, there are solutions configured so that they present voltage ripple eliminator circuits that, through common bidirectional converters and stand-alone units such as the buck, boost, or buck-boost converter inject currents with specific components to process the circuit's reactive powers.
[006]A patente de invenção nos Estados Unidos N° US6804127B2 divulga exemplo destas soluções, referindo-se a um conversor AC/DC/AC construído sem o uso de qualquer capacitor eletrolítico . Esta solução refere-se a uma aplicação genérica em conversor com correção passiva de fator de potência. [006] The United States patent No. US6804127B2 discloses example of these solutions, referring to an AC/DC/AC converter built without the use of any electrolytic capacitor. This solution refers to a generic application in converter with passive power factor correction.
[007] Por sua vez, a patente de invenção nos Estados Unidos N° US8102165B2 é relacionado a um circuito de correção do fator de potência (power factor correction - PFC) que inclui um indutor, um diodo, um capacitor de armazenamento, um comutador e uma unidade de controle, configurados de modo que uma variação de energia absorvida e liberada pelo capacitor de armazenamento é menor, permitindo que a capacitância do mesmo possa ser reduzida significativamente. [007] In turn, the US patent No. US8102165B2 is related to a power factor correction circuit (PFC) that includes an inductor, a diode, a storage capacitor, a switch and a control unit, configured so that a variation of energy absorbed and released by the storage capacitor is smaller, allowing its capacitance to be significantly reduced.
[008]Mais especificamente, este documento descreve uma solução dotada de dois conversores em cascata, sendo um circuito PFC e um conversor CC-CC. O controlador utilizado no circuito PFC proposto neste documento é convencional, ou seja, dotado de uma malha de corrente de entrada e de uma malha de tensão de saída. Esta solução desvantajosamente apresenta uma grande ondulação de tensão no capacitor de saída, além de corrente contendo terceira, quinta e sétima harmónicas. [008] More specifically, this document describes a solution with two cascade converters, being a PFC circuit and a CC-CC converter. The controller used in the PFC circuit proposed in this document is conventional, that is, equipped with an input current loop and an output voltage loop. This solution disadvantageously presents a large voltage ripple across the output capacitor, in addition to a current containing third, fifth and seventh harmonics.
[009] Já o pedido de patente de invenção na China N° CN104539179A divulga um método de controle e conversor configurados para atuar com um menor valor eficaz de ondulação de corrente de capacitância, em que o conversor compreende um circuito de potência principal e um circuito
de controle. [009] The patent application in China No. CN104539179A discloses a method of control and converter configured to act with a lower effective value of capacitance current ripple, in which the converter comprises a main power circuit and a circuit of control.
[0010] O circuito de controle ora descrito compreende uma pluralidade de circuitos menores e o conversor é configurado para permitir controlar um menor valor eficaz de corrente de ondulação de um capacitor eletrolitico do conversor. [0010] The control circuit described herein comprises a plurality of smaller circuits and the converter is configured to allow to control a lower rms value of ripple current of an electrolytic capacitor of the converter.
[0011] Observa-se que esta solução trata de um conversor boost PFC operando em modo de condução descontinuo (DCM). De maneira desvantajosa, o boost PFC em DCM apresenta uma corrente de entrada contendo terceira harmónica com fase de 180°, o que aumenta a ondulação de tensão no capacitor de salda. [0011] It is observed that this solution deals with a PFC boost converter operating in discontinuous conduction mode (DCM). Disadvantageously, the PFC boost in DCM features an input current containing a 180° phase third harmonic, which increases the voltage ripple in the output capacitor.
[0012] Por fim, a patente de invenção nos Estados Unidos N° US9300217B2 divulga um conversor AC/DC incluindo um capacitor de salda com uma pequena capacitância e uma vida útil longa, usando um eliminador de oscilação de corrente com um controle de realimentação de tensão simples. [0012] Finally, United States Patent No. US9300217B2 discloses an AC/DC converter including an output capacitor with a small capacitance and a long service life, using a surge current eliminator with a feedback control. simple tension.
[0013] Esta solução também apresenta o já mencionado circuito eliminador de ondulação (ou filtro ativo CC). Este é um conversor bidirecional, que pode ser o buck, boost, buck-boost, etc., configurado para injetar e absorver corrente do barramento CC do conversor PFC, possuindo um capacitor configurado para processar a potência reativa. [0013] This solution also features the aforementioned ripple eliminator circuit (or active DC filter). This is a bidirectional converter, which can be buck, boost, buck-boost, etc., configured to inject and absorb current from the PFC converter's DC bus, having a capacitor configured to process the reactive power.
[0014] Sendo assim, não se observa no estado da técnica uma solução com somente um conversor que simultaneamente apresente um capacitor dedicado exclusivamente ao desacoplamento de potência ativa, o qual não está conectado a nenhuma carga e que drena corrente contendo harmónicas impares com fase de 0º preferencialmente, da rede elétrica. [0014] Therefore, there is no solution in the state of the art with only one converter that simultaneously presents a capacitor dedicated exclusively to active power decoupling, which is not connected to any load and which drains current containing odd harmonics with phase of 0º preferably from the electrical network.
Objetivos da Invenção
[0015] Um objetivo da presente invenção é prover um sistema e método de controle para que as harmónicas impares drenadas da porta C.A. contenham fase de 0º preferencialmente . Invention Objectives [0015] An objective of the present invention is to provide a control system and method so that the drained odd harmonics of the AC gate preferably contain 0º phase.
[0016] Um objetivo da presente invenção é prover um sistema e método configurados para reduzir uma ondulação de tensão de saida e necessidade de capacitância do conversor. [0016] An objective of the present invention is to provide a system and method configured to reduce an output voltage ripple and converter capacitance requirement.
[0017] Um objetivo da presente invenção é prover um sistema e método configurados para que as terceiras harmónicas apresentem fase de 0º preferencialmente. [0017] An objective of the present invention is to provide a system and method configured so that the third harmonics preferably present a 0º phase.
[0018] Um objetivo da presente invenção é prover um conversor monofásico. [0018] An objective of the present invention is to provide a single-phase converter.
Breve Descrição da Invenção Brief Description of the Invention
[0019] Os objetivos da presente invenção são alcançados por meio de um sistema de controle para conversor monofásico, conectado a uma rede elétrica, o qual se conecta a dois barramentos distintos: BI conectado a um capacitor Cl, que está configurado para estar em paralelo a uma carga Ro e cuja tensão é constante; e B2 ligado em paralelo a um outro capacitor C2, cujo objetivo é absorver as ondulações de potência ativa oriundas da rede elétrica monofásica. [0019] The objectives of the present invention are achieved through a control system for a single-phase converter, connected to an electrical network, which connects to two different buses: BI connected to a capacitor Cl, which is configured to be in parallel to a load Ro and whose voltage is constant; and B2 connected in parallel to another capacitor C2, whose objective is to absorb the ripples of active power coming from the single-phase electrical network.
[0020] Os objetivos da presente invenção são alcançados por meio de um sistema de controle que permita remover as ondulações de tensão do barramento Bl, transferindo-as para o barramento B2, permitindo o desacoplamento das ondulações de potência entre a porta C.A. e o barramento Bl, com a utilização do EAPD preferencialmente . [0020] The objectives of the present invention are achieved by means of a control system that allows removing the voltage ripples from the Bl bus, transferring them to the B2 bus, allowing the decoupling of the power ripples between the AC port and the bus B1, with the use of the EAPD preferably.
[0021] Os objetivos da presente invenção são alcançados por meio de um método de controle para conversor monofásico compatível com o sistema de controle para
conversor monofásico citado. [0021] The objectives of the present invention are achieved by means of a control method for single-phase converter compatible with the control system for single-phase converter quoted.
[0022] Os objetivos da presente invenção são alcançados ainda por meio de um conversor monofásico compatível com o sistema e método de controle também objetos da presente invenção. [0022] The objectives of the present invention are further achieved by means of a single-phase converter compatible with the control system and method also objects of the present invention.
Breve Descrição dos Desenhos Brief Description of Drawings
[0023] A presente invenção será, a seguir, mais detalhadamente descrita com base em um exemplo de execução representado nos desenhos. As figuras mostram: [0023] The present invention will be described in more detail below, based on an example of execution represented in the drawings. The figures show:
[0024] Figura 1 - é um conversor Theta do estado da técnica; [0024] Figure 1 - is a state of the art Theta converter;
[0025] Figura 2 - é um conversor buck-boost de dois interruptores do estado da técnica; [0025] Figure 2 - is a buck-boost converter of two switches of the prior art;
[0026] Figura 3 - é um conversor buck-boost de um interruptor e frequência variável do estado da técnica; [0026] Figure 3 - is a buck-boost converter of a switch and variable frequency of the prior art;
[0027] Figura 4 - é um gráfico que compara o estado da técnica (linha tracejada) e a presente invenção (linha contínua), exemplificando uma relação entre tensão máxima em um barramento CC e capacitância do referido barramento CC. [0027] Figure 4 - is a graph comparing the state of the art (dashed line) and the present invention (continuous line), exemplifying a relationship between maximum voltage in a DC bus and capacitance of said DC bus.
[0028] Figura 5 - é uma tabela exemplificando uma relação entre valores de harmónicas drenadas da rede e uma capacitância de um capacitor requerido, conforme ensinamentos da presente invenção; [0028] Figure 5 - is a table exemplifying a relationship between harmonic values drained from the network and a capacitance of a required capacitor, according to the teachings of the present invention;
[0029] Figura 6 - é uma malha de controle de acordo com a presente invenção; [0029] Figure 6 - is a control loop according to the present invention;
[0030] Figura 7a - é uma representação da amplitude de uma terceira harmónica em linha cheia e a linha tracejada representa a amplitude de uma quinta harmónica drenadas da corrente da rede monofásica; [0030] Figure 7a - is a representation of the amplitude of a third harmonic in a solid line and the dashed line represents the amplitude of a fifth harmonic drained from the current of the single-phase network;
[0031] Figura 7b - é um gráfico comparativo, em que
a linha tracejada representa a amplitude da ondulação da tensão no capacitor usando uma senoide e a linha cheia representa a ondulação reduzida com a implementação da presente invenção. [0031] Figure 7b - is a comparative chart, in which the dashed line represents the amplitude of the voltage ripple across the capacitor using a sine wave and the solid line represents the ripple reduced with the implementation of the present invention.
[0032] Figura 8 - representa um primeiro estado topológico de acordo com os ensinamentos da presente invenção; [0032] Figure 8 - represents a first topological state according to the teachings of the present invention;
[0033] Figura 9 - representa um segundo estado topológico de acordo com os ensinamentos da presente invenção; [0033] Figure 9 - represents a second topological state in accordance with the teachings of the present invention;
[0034] Figura 10 - representa um terceiro estado topológico de acordo com os ensinamentos da presente invenção; [0034] Figure 10 - represents a third topological state in accordance with the teachings of the present invention;
[0035] Figura 11 representa um quarto estado topológico de acordo com os ensinamentos da presente invenção; [0035] Figure 11 represents a fourth topological state in accordance with the teachings of the present invention;
[0036] Figura 12 - é um diagrama de blocos de acordo com os ensinamentos da presente invenção. [0036] Figure 12 - is a block diagram in accordance with the teachings of the present invention.
Descrição Detalhada das Figuras Detailed Description of Figures
[0037] A presente invenção tem como base o fato de que um capacitor pode ser projetado para uma potência menor e proporcionar uma mesma ondulação de tensão em potência nominal através do uso de harmónicas de corrente. [0037] The present invention is based on the fact that a capacitor can be designed for a lower power and provide the same voltage ripple at rated power through the use of current harmonics.
[0038] A ondulação de tensão em um capacitor aumenta linearmente com o aumento da potência. Caso sejam utilizadas terceiras e quintas harmónicas, então a ondulação de tensão pode ser reduzida, conforme a figura 07b. [0038] The voltage ripple in a capacitor increases linearly with increasing power. If third and fifth harmonics are used, then the voltage ripple can be reduced, as shown in figure 07b.
[0039] A principio, a presente invenção refere-se a um sistema de controle 1 para conversor monofásico 2 como, por exemplo, do tipo theta preferencialmente. Alternativamente, observa-se que outros conversores podem
desempenhar papel similar como, por exemplo, o conversor buck-boost de dois interruptores ou com um interruptor e frequência de comutação variável, conforme exemplificado nas figuras 1 a 3. [0039] In principle, the present invention refers to a control system 1 for single-phase converter 2, for example, preferably theta type. Alternatively, it is noted that other converters can play a similar role as, for example, the two-switch buck-boost converter or with a switch and variable switching frequency, as exemplified in figures 1 to 3.
[0040] De todo modo, o conversor 2 utilizado é configurado para funcionar em ao menos um dentre um sentido CA-CC e CC-CA. As caracteristicas descritas serão relacionadas preferencialmente a uma operação no sentido CA- CC, mas podem ser adaptadas para um sentido CC-CA isto é, para um funcionamento como inversor. [0040] In any case, the converter 2 used is configured to work in at least one of the AC-DC and CC-AC directions. The characteristics described will preferably relate to an operation in the AC-DC direction, but can be adapted to a DC-AC direction, that is, for operation as an inverter.
[0041] O referido sistema de controle 1 objeto da presente invenção é compatível com uma malha de controle especifica tal como aquela ilustrada na figura 6, em que o sistema 1 compreende ao menos dois barramentos Bl, B2 eletricamente conectados a um primeiro capacitor Cl, a um segundo capacitor C2 e a uma rede monofásica. [0041] Said control system 1 object of the present invention is compatible with a specific control loop such as that illustrated in figure 6, in which system 1 comprises at least two buses B1, B2 electrically connected to a first capacitor Cl, to a second capacitor C2 and to a single-phase network.
[0042] Cumpre observar que redes trifásicas não possuem potência oscilatória quando estão equilibradas. Assim sendo, a presente invenção não se aplica preferencialmente a sistemas trifásicos de forma direta. [0042] It should be noted that three-phase networks do not have oscillatory power when they are balanced. Therefore, the present invention preferably does not apply to three-phase systems directly.
[0043] Ademais, outros componentes adicionais podem vir a compor a presente invenção, de modo que os componentes ora descritos não são limitantes da presente invenção, em que esta pode ser implementada utilizando componentes equivalentes que permitam atingir os mesmos objetivos propostos. A titulo de exemplo, os capacitores são preferencialmente do tipo de filme, pois estes apresentam vida útil mais elevada. Todavia, estes componentes podem alternativamente ser capacitores cerâmicos, por exemplo. [0043] In addition, other additional components may come to compose the present invention, so that the components described herein are not limiting of the present invention, in which it can be implemented using equivalent components that allow to achieve the same proposed objectives. As an example, the capacitors are preferably of the film type, as they have a longer service life. However, these components can alternatively be ceramic capacitors, for example.
[0044] Em relação aos componentes do sistema 1 objeto da presente invenção, estes serão descritos detalhadamente
a seguir. [0044] In relation to the components of system 1 object of the present invention, these will be described in detail Next.
[0045] Os barramentos Bl, B2, são eletricamente conectados respectivamente à carga e a um capacitor para desacoplamento de potência ativa. Assim, o conversor da presente invenção é configurado para possuir dois braços, sendo um de retificação e um neutro. [0045] The buses B1, B2, are electrically connected respectively to the load and to a capacitor for decoupling of active power. Thus, the converter of the present invention is configured to have two arms, one rectifying and one neutral.
[0046] Com referência especial às figuras 1 e 12 primeiro capacitor Cl é configurado para estar em paralelo com uma carga Ro, em que a referida carga Ro pode ser entendida como qualquer equipamento ou aparelho que necessite de uma alimentação tal qual a tensão do primeiro capacitor Cl. [0046] With special reference to Figures 1 and 12, the first capacitor Cl is configured to be in parallel with a load Ro, wherein said load Ro can be understood as any equipment or apparatus that requires a supply such as the voltage of the first capacitor Cl.
[0047] Já o segundo capacitor C2 é configurado para estar conectado a uma carga, em que esta carga é nula ou quase nula. Em outras palavras, deve ser entendido que o segundo capacitor C2 não está ligado a nenhuma carga ou que a carga é desprezível em relação a carga que está conectada ao barramento Bl. Exemplos de uma carga quase nula incluem: fonte de alimentação auxiliar, circuito de descarga de capacitor e/ou circuito de sensoriamento de tensão. Com isso, este segundo capacitor C2 é configurado de tal forma que sua tensão pode oscilar livremente, de modo que uma ondulação de tensão sobre este capacitor é elevada. [0047] The second capacitor C2 is configured to be connected to a load, in which this load is zero or almost zero. In other words, it must be understood that the second capacitor C2 is not connected to any load or that the load is negligible in relation to the load that is connected to bus Bl. Examples of a near zero load include: auxiliary power supply, power circuit capacitor discharge and/or voltage sensing circuit. Thus, this second capacitor C2 is configured in such a way that its voltage can fluctuate freely, so that a voltage ripple over this capacitor is high.
[0048] Neste caso, uma oscilação de tensão elevada pode ser entendida como 70% da tensão eficaz do lado da porta C.A., por exemplo. [0048] In this case, a high voltage oscillation can be understood as 70% of the rms voltage on the side of the C.A. gate, for example.
[0049] O sistema objeto da presente invenção compreende ainda um módulo de desacoplamento de potência automático melhorado (EAPD). Mais especificamente, o presente sistema é configurado para realizar uma dissociação de ações de controle de corrente CA e tensão nos barramentos
CC, por exemplo através do uso do EAPD. [0049] The system object of the present invention further comprises an improved automatic power decoupling module (EAPD). More specifically, the present system is configured to perform a decoupling of AC current and voltage control actions on the buses CC, for example through the use of the EAPD.
[0050] Cumpre notar que o uso do EAPD compreende apenas uma configuração possível da presente invenção, de maneira que outros componentes podem ser igualmente utilizados para atingir os objetivos propostos. [0050] It should be noted that the use of the EAPD comprises only one possible configuration of the present invention, so that other components can also be used to achieve the proposed objectives.
[0051] Conforme será melhor detalhado a seguir, este módulo especifico é configurado preferencialmente por meio de ao menos um dentre um controlador do tipo proporcional e um controlador do proporcional-integral, de modo que uma ondulação de potência ativa absorvida da rede monofásica seja injetada no segundo capacitor C2. [0051] As will be further detailed below, this specific module is preferably configured by means of at least one of a proportional-type controller and a proportional-integral controller, so that a ripple of active power absorbed from the single-phase network is injected on the second capacitor C2.
[0052] Esta ondulação de potência ativa absorvida da rede monofásica e injetada no segundo capacitor C2 contém harmónicas impares com fase de 0º, preferencialmente. [0052] This ripple of active power absorbed from the single-phase network and injected into the second capacitor C2 contains odd harmonics with 0º phase, preferably.
[0053] Mais especificamente, o sistema 1 é configurado por meio da drenagem de corrente da rede elétrica contendo harmónicas impares (sinal da rede monofásica) em que o módulo de desacoplamento de potência automático melhorado EAPD é configurado com banda passante suficiente para permitir que todas as harmónicas de um sinal de referência possam ser reproduzidas em um sinal de corrente. [0053] More specifically, system 1 is configured by draining current from the mains containing odd harmonics (single-phase mains signal) in which the EAPD enhanced automatic power decoupling module is configured with enough bandwidth to allow all harmonics from a reference signal can be reproduced in a current signal.
Em relação ao módulo de desacoplamento de potência automático melhorado EAPD, este permite utilizar um controlador proporcional ou proporcional integral para inserção de tais harmónicas, desde que a banda passante de tais controladores seja significativamente maior do que a harmónica a ser drenada da rede elétrica. Regarding the EAPD improved automatic power decoupling module, it allows to use an integral proportional or proportional controller for insertion of such harmonics, provided that the passband of such controllers is significantly greater than the harmonic to be drained from the electrical network.
[0054] Especialmente os sinais harmónicos impares influenciam nos sinais de salda do sistema especialmente no sentido de que os harmónicos reduzem a razão entre o valor de pico e o valor médio da potência drenada da rede. Como
consequência, para a mesma potência ativa, uma ondulação de potência menor precisa ser absorvida pelo capacitor C2. [0054] Especially the odd harmonic signals influence the system output signals especially in the sense that the harmonics reduce the ratio between the peak value and the average value of the power drained from the network. Like Consequently, for the same active power, a lower power ripple needs to be absorbed by capacitor C2.
[0055] Especialmente as correntes harmónicas impares influenciam na ondulação de tensão no capacitor C2 no sentido de que reduzem a razão entre o valor de pico e o valor médio da potência instantânea drenada da rede. Como consequência, para a mesma potência ativa, uma ondulação de potência menor precisa ser absorvida pelo capacitor C2. [0055] Especially the odd harmonic currents influence the voltage ripple in capacitor C2 in the sense that they reduce the ratio between the peak value and the average value of the instantaneous power drained from the network. As a consequence, for the same active power, a lower power ripple needs to be absorbed by capacitor C2.
[0056] Frente às caracteristicas acima, tem-se que o módulo de dissociação de energia automática aprimorada EAPD é configurado de modo que toda a ondulação de potência absorvida da rede monofásica seja injetada no segundo capacitor C2, tal que a ondulação de tensão sobre o mesmo seja elevada tal como já descrito. [0056] In view of the above characteristics, the EAPD enhanced automatic energy decoupling module is configured so that all the absorbed power ripple of the single-phase network is injected into the second capacitor C2, such that the voltage ripple over the even be high as already described.
[0057] Com isso, tem-se que o módulo de dissociação de energia automática aprimorada EAPD evita o uso de controladores ressonantes e repetitivos. [0057] With this, it has that the EAPD enhanced automatic energy decoupling module avoids the use of resonant and repetitive controllers.
[0058] Matematicamente falando, a relação entre o valor de capacitância e as harmónicas drenadas ou injetadas na rede pode ser determinada conforme segue. [0058] Mathematically speaking, the relationship between the capacitance value and the harmonics drained or injected into the network can be determined as follows.
[0059] Sejam a tensão e a corrente do lado CA respectivamente dadas pelas equações:
[0059] Let the AC side voltage and current respectively be given by the equations:
Onde Vn e In representam as amplitudes das n=l..k harmónicas de tensão e corrente da rede monofásica. ωg é a
frequência angular da rede monofásica e Φn representa a fase da harmónica n em relação à fundamental de corrente. Where V n and I n represent the amplitudes of the n=l..k voltage and current harmonics of the single-phase network. ω g is the angular frequency of the single-phase network and Φ n represents the phase of the harmonic n in relation to the current fundamental.
[0060] Os sinais drenados da rede (potência) e introduzidos ao lado da carga Ro são dadas respectivamente pelas equações:
[0060] The signals drained from the network (power) and introduced next to the load Ro are given respectively by the equations:
Onde Pg é a potência instantânea drenada da rede, pL é a potência reativa trocada com o indutor do lado da porta C.A. e pcc é a potência entregue ao barramento BI do conversor. Where Pg is the instantaneous power drawn from the network, p L is the reactive power exchanged with the inductor on the AC port side and p cc is the power delivered to the converter's BI bus.
[0061] As parcelas constante Pc e oscilatória pr da potência vista pela carga são dadas respectivamente pelas equações:
[0061] The constant P c and oscillatory p r portions of the power seen by the load are given respectively by the equations:
[0062] Sendo e(t) a energia a ser armazenada no segundo capacitor C2 de desacoplamento de potência ativa, então sua energia instantânea é dada pela equação deduzida abaixo:
[0062] Since e(t) is the energy to be stored in the second active power decoupling capacitor C2, then its instantaneous energy is given by the equation deduced below:
[0063] Dado que a função e(t) é periódica (com período igual a metade do período da rede) ela possui um valor máximo Emáx e um valor mínimo Emin, logo:
[0063] Since the function e(t) is periodic (with a period equal to half the period of the network) it has a maximum value E max and a minimum value E min , therefore:
[0064] A tensão máxima no segundo capacitor C2 é:
[0064] The maximum voltage on the second capacitor C2 is:
[0065] A capacitância do segundo capacitor C2 é:
[0065] The capacitance of the second capacitor C2 is:
[0066] As equações acima são resolvidas de forma numérica. Como exemplo, considerando um conversor com Po=lkW, Vgrms = 220V, Vo = 400V, fg = 50Hz, Lg = 466uH e tensão mínima de 750V no capacitor C2, a figura 4 mostra a relação entre a capacitância teórica e a tensão máxima no segundo capacitor C2, considerando o uso de 3a harmónica no limite da classe A da IEC61000-3-2. Esta tensão é a mesma tensão de bloqueio dos interruptores no caso do conversor theta. [0066] The above equations are solved numerically. As an example, considering a converter with Po=lkW, Vgrms = 220V, Vo = 400V, fg = 50Hz, Lg = 466uH and minimum voltage of 750V in capacitor C2, figure 4 shows the relationship between theoretical capacitance and maximum voltage in the second capacitor C2, considering the use of harmonic 3 within the limits of class a IEC61000-3-2. This voltage is the same as the blocking voltage of the switches in the case of the theta converter.
[0067] Para o mesmo conversor, considerando o uso de
outras correntes harmónicas, a figura 5 apresenta um resumodos cálculos numéricos.A tensão do segundo capacitor C2 foiconsiderada como oscilando entre 750 e 1000V. [0068] Obviamente que os valores apresentados devemser entendidos apenas como exemplos de uma possívelconfiguração da presente invenção, ou seja, não sãolimitações para a mesma de modo que outros valores como, porexemplo, os da figura 5 podem ser utilizados para que osobjetivos propostos sejam igualmente atingidos. [0069] A relação entre valores de harmónicasdrenadas da rede e uma capacitância de um capacitor requeridoé exemplificada na figura 4. [0070] Considera-se que para o conversor theta asrazões cíclicas dos estados topológicos 1, 2, 3, e 4 (taiscomo mostradas nas figuras 7, 8, 9 e 10) são dadas porde1,de2,de3 e de4 respectivamente, e que as razões cíclicas dosinterruptores S1,S2,S3 eS4 são dadas respectivamente pord1,d2,d3 Gd4. [0071] Com referência principalmente às figuras 8,9, 10 e 11, o controle EAPD aplicado ao conversor theta édescrito pelas equações abaixo. [0072] A tensão média no indutor do lado CA é dadapor:
[0073] Seja a tensão média no indutor do lado CC:
[0074] A corrente média no segundo capacitor C2:
[0067] For the same converter, considering the use of For other harmonic currents, figure 5 presents a summary of the numerical calculations. The voltage of the second capacitor C2 was considered to oscillate between 750 and 1000V. [0068] Obviously, the values presented should be understood only as examples of a possible configuration of the present invention, that is, they are not limitations for it, so that other values such as, for example, those in Figure 5 can be used so that the proposed objectives are also reached. [0069] The relationship between values of harmonics drained from the network and a capacitance of a required capacitor is exemplified in figure 4. [0070] It is considered that for the theta converter the cyclic ratios of topological states 1, 2, 3, and 4 (as shown in figures 7, 8, 9 and 10) are given by d e1 ,d e2 ,d e3 and d e4 respectively, and that the cyclic ratios of the switches S 1 ,S 2 ,S 3 andS 4 are given respectively by d 1 ,d 2 ,d 3 Gd 4 . [0071] Referring mainly to figures 8,9, 10 and 11, the EAPD control applied to the theta converter is described by the equations below. [0072] The average voltage in the AC side inductor is given by: [0073] Let the average voltage in the DC side inductor be: [0074] The average current in the second capacitor C2:
[0075] E a corrente média no primeiro capacitor Cl de saída:
[0075] And the average current in the first output capacitor Cl:
[0078] Eliminando todos os termos, exceto os da diagonal (de forma a desacoplar as plantas de controle), vem: [0078] Eliminating all terms, except those on the diagonal (in order to decouple the control plants), comes:
Equação X: Equation X:
[0079] Isolando-se as razões cíclicas d2 e d4 da equação Y vem:
[0079] Isolating the cyclic ratios d 2 and d 4 from the Y equation comes:
[0082] Como as plantas são simples (integradores e funções de transferência de primeira ordem), o controle pode ser projetado de forma convencional para atender requisitos de tempo de acomodação, sobressinal, etc. [0082] As the plants are simple (integrators and first order transfer functions), the control can be designed in a conventional way to meet accommodation time, over-signal, etc. requirements.
[0083] Além disso, conforme já mencionado, a presente invenção não utiliza controladores ressonantes nem repetitivos, sendo simples o projeto do controlador de corrente no indutor do lado CA (Lg) para seguimento de uma referência de corrente não senoidal. [0083] In addition, as already mentioned, the present invention does not use resonant or repetitive controllers, being simple the design of the current controller in the AC side inductor (Lg) to follow a non-sinusoidal current reference.
[0084] Um exemplo de diagrama de controle referente ao sistema objeto da presente invenção é mostrado principalmente na figura 6. [0084] An example of a control diagram referring to the system object of the present invention is shown mainly in figure 6.
[0085] A presente invenção compreende ainda um método de controle para conversor monofásico 2, em que o
referido método é compatível com o sistema descrito anteriormente e composto ao menos por dois barramentos Bl, B2 eletricamente conectados a um primeiro capacitor Cl, a um segundo capacitor C2 e a uma rede monofásica. [0085] The present invention further comprises a control method for single-phase converter 2, in which the This method is compatible with the system described above and consists of at least two buses B1, B2 electrically connected to a first capacitor Cl, a second capacitor C2 and a single-phase network.
[0086] Em relação aos componentes, tem-se que estes possuem as mesmas características daqueles ora descritos para o sistema também objeto da presente invenção, isto é, integradores e funções de transferência de primeira ordem. [0086] In relation to the components, they have the same characteristics as those described for the system also object of the present invention, that is, integrators and first order transfer functions.
[0087] Assim sendo, de acordo com as técnicas de controle linear e salvo devidas adaptações, estes componentes possuem as mesmas características técnico- funcionais já descritas. [0087] Therefore, according to the linear control techniques and except for due adaptations, these components have the same technical-functional characteristics already described.
[0088] Em relação ao método proposto propriamente dito, tem-se que este compreende uma pluralidade de etapas, as quais serão detalhadamente descritas a seguir. [0088] Regarding the proposed method itself, it has to comprise a plurality of steps, which will be described in detail below.
[0089] Uma etapa do presente método compreende conectar o primeiro capacitor Cl em paralelo com uma carga Ro. Resumidamente, a carga Ro pode ser entendida como qualquer equipamento ou aparelho que necessite de uma alimentação tal qual a tensão do primeiro capacitor Cl. [0089] One step of the present method comprises connecting the first capacitor Cl in parallel with a charge Ro. Briefly, the charge Ro can be understood as any equipment or apparatus that requires a supply such as the voltage of the first capacitor Cl.
[0090] Uma etapa do presente método compreende ainda conectar o segundo capacitor C2 a uma carga, nula ou quase nula. Nesta etapa, deve ser entendido que o segundo capacitor C2 é ligado a nenhuma carga. Com isso, esta etapa se dá no sentido de que o segundo capacitor C2 é configurado para que sua tensão possa oscilar livremente, de modo que a amplitude da ondulação de tensão sobre este capacitor C2 é elevada. [0090] A step of the present method further comprises connecting the second capacitor C2 to a charge, zero or almost zero. In this step, it should be understood that the second capacitor C2 is connected to no load. Thus, this step takes place in the sense that the second capacitor C2 is configured so that its voltage can oscillate freely, so that the amplitude of the voltage ripple over this capacitor C2 is high.
[0091] Uma outra etapa do método proposto compreende absorver uma ondulação de potência ativa da rede monofásica, a qual é seguida por uma etapa de injetar a ondulação de potência ativa absorvida no segundo capacitor C2.
[0092] Estas etapas são realizadas por meio de um módulo de dissociação de energia automática aprimorada EAPD, o qual já foi detalhadamente descrito. Assim, as caracteristicas do módulo de dissociação de energia automática aprimorada EAPD ora descritas para o sistema objeto da presente invenção também se aplicam ao método ora proposto. [0091] Another step of the proposed method comprises absorbing a ripple of active power from the single-phase network, which is followed by a step of injecting the ripple of active power absorbed in the second capacitor C2. [0092] These steps are performed through an EAPD enhanced automatic energy decoupling module, which has already been described in detail. Thus, the characteristics of the EAPD enhanced automatic energy dissociation module described herein for the system object of the present invention also apply to the method proposed herein.
[0093] Vale citar que as etapas de absorver a ondulação de potência ativada rede monofásica e injetar a referida ondulação no segundo capacitor C2 são configuradas de modo que a ondulação corrente do lado CA contém harmónicas impares, preferencialmente com fase de 0º. [0093] It is worth mentioning that the steps of absorbing the activated power ripple in the single-phase network and injecting said ripple in the second capacitor C2 are configured so that the current ripple on the AC side contains odd harmonics, preferably with 0º phase.
[0094] Para tal, o módulo de dissociação de tensão de energia automática aprimorada EAPD é configurado tal como já descrito previamente. Sumariamente, este é configurado com banda passante suficiente para permitir que todas as harmónicas de um sinal de referência possam ser reproduzidas na corrente do lado CA. [0094] For such, the EAPD enhanced automatic energy voltage decoupling module is configured as previously described. Briefly, this is configured with enough passband to allow all harmonics of a reference signal to be reproduced in the current on the AC side.
[0095] Assim sendo, o método proposto compreende uma etapa de introduzir harmónicas impares, preferencialmente com fase de 0º no sinal de referência. [0095] Therefore, the proposed method comprises a step of introducing odd harmonics, preferably with 0º phase in the reference signal.
[0096] Por fim, a presente invenção compreende ainda um conversor monofásico 2 compreendendo ao menos dois barramentos Bl, B2 eletricamente conectados a um primeiro capacitor Cl, a um segundo capacitor C2 configurado tal como o sistema e método também objetos da presente invenção e compatível com estes, os quais já foram descritos previamente . [0096] Finally, the present invention further comprises a single-phase converter 2 comprising at least two buses Bl, B2 electrically connected to a first capacitor Cl, to a second capacitor C2 configured such as the system and method also objects of the present invention and compatible with these, which have already been described previously.
[0097] Para exemplificar alguns cenários nos quais a presente invenção pode atuar, tem-se o exemplo que segue. [0097] To exemplify some scenarios in which the present invention can act, there is the following example.
Exemplo 1
[0098] Considerando uma solução do estado da técnica, tem-se que o capacitor é projetado para que entre 548W e lkW a ondulação de tensão no capacitor de desacoplamento seja em torno de 100V. Example 1 [0098] Considering a prior art solution, the capacitor is designed so that between 548W and lkW the voltage ripple in the decoupling capacitor is around 100V.
[0099] O conversor opera com fator de potência aproximadamente 1 em potência menor que 548W. [0099] The converter operates with power factor approximately 1 at power less than 548W.
[00100] Neste caso, a ondulação de tensão no capacitor em potência nominal (lkW) usando senoide é de 156.6V. [00100] In this case, the voltage ripple across the capacitor at rated power (lkW) using sine wave is 156.6V.
[00101] Em contrapartida, com base nos cálculos mencionados acima, tem-se que usando 3a e 5a harmónicas de corrente, a amplitude da ondulação da tensão no capacitor é de 105.8V. [00101] On the other hand, based on the calculations mentioned above, using 3 a and 5 a harmonics of current, the amplitude of the voltage ripple in the capacitor is 105.8V.
[00102] Isto é, observa-se uma redução de 32,4% no valor de ondulação de tensão, ou equivalentemente, no valor de capacitância. [00102] That is, there is a reduction of 32.4% in the voltage ripple value, or equivalently, in the capacitance value.
[00103] Este exemplo pode ser visto especialmente nos gráficos das figuras 7a e 7b. [00103] This example can be seen especially in the graphics of figures 7a and 7b.
[00104] O método de controle objeto da presente invenção contempla ainda um módulo de inserção adaptativa de correntes harmónicas no sinal de referência para o controlador da corrente da porta C.A. Este módulo permite aumentar a amplitude das correntes harmónicas com o aumento da potência drenada pela carga, de modo que, com o aumento da potência de saida do conversor, maior a amplitude das correntes harmónicas impares drenadas da rede elétrica. [00104] The control method object of the present invention also contemplates an adaptive insertion module of harmonic currents in the reference signal for the AC gate current controller. This module allows to increase the amplitude of harmonic currents with the increase of the power drained by the load , so that, with the increase in the output power of the converter, the greater the amplitude of the odd harmonic currents drained from the electrical network.
[00105] O módulo de inserção adaptativa de correntes harmónicas gera a parcela do sinal de referência para a corrente do lado C.A. que contém as harmónicas, de modo que a amplitude das correntes harmónicas cresce com o aumento da potência de saida.
[00106] As figuras 7a e 7b apresentam a realização preferida do módulo de inserção adaptativa de correntes harmónicas. [00105] The adaptive harmonic current insertion module generates the portion of the reference signal for the AC side current that contains the harmonics, so that the amplitude of the harmonic currents grows with increasing output power. [00106] Figures 7a and 7b show the preferred embodiment of the adaptive insertion module for harmonic currents.
[00107] Em concordância com o descrito acima, a presente invenção permite, portanto, um aumento no ciclo de vida do conversor associado à eliminação do capacitor eletrolitico. [00107] In accordance with the above, the present invention therefore allows an increase in the life of the converter associated with the elimination of the electrolytic capacitor.
[00108] Tendo sido descrito um exemplo de concretização preferido, deve ser entendido que o escopo da presente invenção abrange outras possíveis variações, sendo limitado tão somente pelo teor das reivindicações apensas, aí incluídos os possíveis equivalentes.
[00108] Having described an example of preferred embodiment, it should be understood that the scope of the present invention encompasses other possible variations, being limited only by the content of the appended claims, including possible equivalents.
Claims
1. Sistema de controle (1) para conversor monofásico (2) compreendendo ao menos dois barramentos (Bl, B2) eletricamente conectados a um primeiro capacitor (Cl), a um segundo capacitor (C2) e a uma rede monofásica, o sistema de controle (1) para conversor monofásico (2) de corrente sendo caracterizado pelo fato de que o primeiro capacitor (Cl) é configurado para estar em paralelo com uma carga (Ro) e o segundo capacitor (C2) é configurado para estar conectado a uma carga nula ou quase nula, em que o sistema é configurado por meio de ao menos um dentre um controlador do tipo proporcional e um controlador do tipo proporcional-integral, de modo que uma ondulação de potência ativa absorvida da rede monofásica seja absorvida e injetada no segundo capacitor (C2), em que o sistema é configurado ainda de modo que simultaneamente o segundo capacitor (C2) seja dedicado a um desacoplamento de potência ativa e para que seja drenada corrente contendo harmónicas impares, com fase de 0º preferencialmente, da rede elétrica. 1. Control system (1) for single-phase converter (2) comprising at least two buses (Bl, B2) electrically connected to a first capacitor (Cl), a second capacitor (C2) and a single-phase network, the control (1) for single-phase current (2) converter being characterized by the fact that the first capacitor (Cl) is configured to be in parallel with a load (Ro) and the second capacitor (C2) is configured to be connected to a zero or near zero load, in which the system is configured by means of at least one of a proportional-type controller and a proportional-integral type controller, so that a ripple of active power absorbed from the single-phase network is absorbed and injected into the second capacitor (C2), in which the system is further configured so that simultaneously the second capacitor (C2) is dedicated to an active power decoupling and so that current containing odd harmonics is drained, preferably with 0º phase from the electrical network.
2. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 1, caracterizado pelo fato de que o segundo capacitor (C2) é configurado de modo que sua tensão pode oscilar livremente. 2. Control system (1) for single-phase converter (2), according to claim 1, characterized in that the second capacitor (C2) is configured so that its voltage can fluctuate freely.
3. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 2, caracterizado pelo fato de que uma ondulação de tensão sobre o segundo capacitor (C2) é elevada. 3. Control system (1) for single-phase converter (2), according to claim 2, characterized in that a voltage ripple on the second capacitor (C2) is high.
4. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 3, caracterizado pelo fato de que o conversor monofásico (2) é configurado para funcionar em ao menos um dentre os sentidos CA-CC e CC-CA.
4. Control system (1) for single-phase converter (2), according to claim 3, characterized in that the single-phase converter (2) is configured to work in at least one of the CA-DC and CC- HERE.
5. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 5, caracterizado pelo fato de que é configurado com banda passante suficiente para permitir que todas as harmónicas de um sinal de referência possam ser reproduzidas em um sinal de corrente. 5. Control system (1) for single-phase converter (2), according to claim 5, characterized in that it is configured with enough passband to allow all harmonics of a reference signal to be reproduced in a signal due.
6. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 6, caracterizado pelo fato de que é configurado por meio da drenagem de harmónicas impares com fase de 0º do sinal de referência. 6. Control system (1) for single-phase converter (2), according to claim 6, characterized in that it is configured by draining odd harmonics with 0º phase of the reference signal.
7. Sistema de controle (1) para conversor monofásico (2), de acordo com a reivindicação 6, caracterizado pelo fato de que a carga é nula ou quase nula. 7. Control system (1) for single-phase converter (2), according to claim 6, characterized in that the load is zero or almost zero.
8. Método de controle para conversor monofásico (2) configurado por meio de ao menos dois barramentos (Bl, B2) eletricamente conectados a um primeiro capacitor (Cl), a um segundo capacitor (C2) e a uma rede monofásica, o método de controle para conversor monofásico (2) sendo caracterizado pelo fato de que compreende ao menos as etapas de: 8. Control method for single-phase converter (2) configured by means of at least two buses (Bl, B2) electrically connected to a first capacitor (Cl), a second capacitor (C2) and a single-phase network, the method of control for single-phase converter (2) being characterized by the fact that it comprises at least the steps of:
Conectar o primeiro capacitor (Cl) em paralelo com uma carga (Ro); Connect the first capacitor (Cl) in parallel with a load (Ro);
Conectar o segundo capacitor (C2) a uma carga nula ou quase nula; Connect the second capacitor (C2) to a zero or almost zero charge;
Absorver uma ondulação de potência ativa da rede monofásica; Absorb an active power surge from the single-phase network;
Injetar a ondulação de potência ativa no segundo capacitor (C2); em que as etapas do referido método são configuradas de modo que simultaneamente o segundo capacitor (C2) seja dedicado a um desacoplamento de potência ativa e para que seja drenada corrente contendo harmónicas impares, com fase de 0º da rede elétrica.
Inject the ripple of active power into the second capacitor (C2); in which the steps of said method are configured so that simultaneously the second capacitor (C2) is dedicated to an active power decoupling and so that current containing odd harmonics, with 0º phase of the electrical network, is drained.
9. Método de controle para conversor monofásico (2), de acordo com a reivindicação 8, caracterizado pelo fato de que a etapa de conectar o segundo capacitor (C2) a uma carga é configurada para que uma tensão no referido capacitor (C2) possa oscilar livremente. 9. Control method for single-phase converter (2), according to claim 8, characterized in that the step of connecting the second capacitor (C2) to a load is configured so that a voltage on said capacitor (C2) can swing freely.
10. Método de controle para conversor monofásico (2), de acordo com a reivindicação 9, caracterizado pelo fato de que a etapa de conectar o segundo capacitor (C2) a uma carga é configurada para que uma tensão no referido capacitor (C2) possa oscilar livremente, em que a ondulação de tensão sobre o segundo capacitor (C2) é elevada. 10. Control method for single-phase converter (2), according to claim 9, characterized in that the step of connecting the second capacitor (C2) to a load is configured so that a voltage on said capacitor (C2) can oscillate freely, where the voltage ripple over the second capacitor (C2) is high.
11. Método de controle para conversor monofásico (2), de acordo com a reivindicação 10, caracterizado pelo fato de que é configurado para funcionar em ao menos um dentre um sentido de conversão CA-CC e CC-CA. 11. Control method for single-phase converter (2), according to claim 10, characterized in that it is configured to work in at least one of a direction of conversion AC-DC and DC-AC.
12. Método de controle para conversor monofásico (2), de acordo com a reivindicação 12, caracterizado pelo fato de que é configurado com base em uma banda passante suficiente para permitir que todas as harmónicas de um sinal de referência possam ser reproduzidas em um sinal de corrente. 12. Control method for single-phase converter (2), according to claim 12, characterized in that it is configured based on a passband sufficient to allow all harmonics of a reference signal to be reproduced in a signal due.
13. Método de controle para conversor monofásico (2), de acordo com a reivindicação 13, caracterizado pelo fato de que compreende ainda uma etapa de introduzir harmónicas impares, com fase de 0º preferencialmente, no sinal de referência. 13. Control method for single-phase converter (2), according to claim 13, characterized in that it further comprises a step of introducing odd harmonics, preferably with 0º phase, in the reference signal.
14. Método de controle para conversor monofásico (2), de acordo com a reivindicação 13, caracterizado pelo fato de que a carga é nula ou quase nula. 14. Control method for single-phase converter (2), according to claim 13, characterized in that the load is zero or almost zero.
15. Conversor monofásico (2) compreendendo ao menos dois barramentos (Bl, B2) eletricamente conectados a um primeiro capacitor (Cl), a um segundo capacitor (C2) e a uma
rede monofásica caracterizado pelo fato de que o primeiro capacitor (Cl) é configurado para estar em paralelo com uma carga (Ro) e o segundo capacitor é configurado para estar conectado a uma carga de modo que a tensão do referido segundo capacitor (C2) possa oscilar livremente com oscilação elevada, em que o sistema é configurado por meio de ao menos um dentre um controlador do tipo proporcional e um controlador do proporcional-integral com banda passante suficiente para permitir que todas as harmónicas de um sinal de referência possam ser reproduzidas em um sinal de corrente, de modo que uma ondulação de potência ativa absorvida da rede monofásica seja absorvida e injetada no segundo capacitor (C2), de modo que simultaneamente o segundo capacitor (C2) seja dedicado a um desacoplamento de potência ativa e para que seja drenada corrente contendo harmónicas impares com fase de 0º da rede elétrica, em que o conversor monofásico (2) é configurado para funcionar em ao menos um dentre um sentido de conversão CA-CC e CC-CA. 15. Single-phase converter (2) comprising at least two buses (Bl, B2) electrically connected to a first capacitor (Cl), a second capacitor (C2) and a single-phase network characterized by the fact that the first capacitor (Cl) is configured to be in parallel with a load (Ro) and the second capacitor is configured to be connected to a load so that the voltage of said second capacitor (C2) can free oscillating with high oscillation, in which the system is configured by means of at least one of a proportional-type controller and a proportional-integral controller with enough passband to allow all harmonics of a reference signal to be reproduced in a current signal, so that a ripple of active power absorbed from the single-phase network is absorbed and injected into the second capacitor (C2), so that simultaneously the second capacitor (C2) is dedicated to an active power decoupling and so that it is drained current containing odd harmonics with 0º phase from the mains, in which the single-phase converter (2) is configured to work in at least one of AC-DC and CC-AC conversion rate.
16. Conversor monofásico (2), de acordo com a reivindicação 15, caracterizado pelo fato de que é compatível com o sistema e método como definidos nas reivindicações 1 a 13. 16. Single-phase converter (2), according to claim 15, characterized in that it is compatible with the system and method as defined in claims 1 to 13.
17. Conversor monofásico (2), de acordo com a reivindicação 15, caracterizado pelo fato de que a carga é nula ou quase nula.
17. Single-phase converter (2), according to claim 15, characterized in that the load is zero or almost zero.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR102019027305-4A BR102019027305A2 (en) | 2019-12-19 | 2019-12-19 | CONTROL SYSTEM AND METHOD FOR SINGLE-PHASE CONVERTER AND SINGLE-PHASE CONVERTER |
BRBR1020190273054 | 2019-12-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021119793A1 true WO2021119793A1 (en) | 2021-06-24 |
Family
ID=74504970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2020/050571 WO2021119793A1 (en) | 2019-12-19 | 2020-12-18 | Control method and system for single-phase converter and single-phase converter |
Country Status (2)
Country | Link |
---|---|
BR (1) | BR102019027305A2 (en) |
WO (1) | WO2021119793A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8102165B2 (en) * | 2008-07-17 | 2012-01-24 | Fsp Technology Inc. | Means of eliminating electrolytic capacitor as the energy storage component in the single phase AD/DC two-stage converter |
US9300217B2 (en) * | 2013-12-25 | 2016-03-29 | National Cheng Kung University | Electrolytic capacitor-less AC/DC converter and controlling method thereof |
US20170117810A1 (en) * | 2014-04-03 | 2017-04-27 | Schneider Electric It Corporation | Isolated and efficient rectifier system |
US20180219474A1 (en) * | 2015-07-21 | 2018-08-02 | Dyson Technology Limited | Battery charger |
-
2019
- 2019-12-19 BR BR102019027305-4A patent/BR102019027305A2/en unknown
-
2020
- 2020-12-18 WO PCT/BR2020/050571 patent/WO2021119793A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8102165B2 (en) * | 2008-07-17 | 2012-01-24 | Fsp Technology Inc. | Means of eliminating electrolytic capacitor as the energy storage component in the single phase AD/DC two-stage converter |
US9300217B2 (en) * | 2013-12-25 | 2016-03-29 | National Cheng Kung University | Electrolytic capacitor-less AC/DC converter and controlling method thereof |
US20170117810A1 (en) * | 2014-04-03 | 2017-04-27 | Schneider Electric It Corporation | Isolated and efficient rectifier system |
US20180219474A1 (en) * | 2015-07-21 | 2018-08-02 | Dyson Technology Limited | Battery charger |
Non-Patent Citations (5)
Title |
---|
HAN-WOONG PARK ET AL: "A Novel High-Performance Voltage Regulator for Single-Phase AC Sources", IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, IEEE SERVICE CENTER, PISCATAWAY, NJ, USA, vol. 48, no. 3, 1 June 2001 (2001-06-01), XP011023836, ISSN: 0278-0046 * |
KAI YAO ET AL: "Reducing Storage Capacitor of a DCM Boost PFC Converter", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 27, no. 1, 1 January 2012 (2012-01-01), pages 151 - 160, XP011389526, ISSN: 0885-8993, DOI: 10.1109/TPEL.2011.2105507 * |
LINLIN GU ET AL: "Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 24, no. 5, 1 May 2009 (2009-05-01), pages 1399 - 1408, XP011257265, ISSN: 0885-8993 * |
QI WENLONG ET AL: "A Single-Phase Three-Level Flying-Capacitor PFC Rectifier Without Electrolytic Capacitors", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 34, no. 7, 1 July 2019 (2019-07-01), pages 6411 - 6424, XP011722045, ISSN: 0885-8993, [retrieved on 20190430], DOI: 10.1109/TPEL.2018.2871552 * |
XINBO RUAN ET AL: "Optimum Injected Current Harmonics to Minimize Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC DC Drivers", IEEE TRANSACTIONS ON POWER ELECTRONICS, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, USA, vol. 26, no. 7, 1 July 2011 (2011-07-01), pages 1820 - 1825, XP011370778, ISSN: 0885-8993, DOI: 10.1109/TPEL.2010.2098482 * |
Also Published As
Publication number | Publication date |
---|---|
BR102019027305A2 (en) | 2021-06-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN111030152B (en) | Energy storage converter system and control method thereof | |
JP6710615B2 (en) | Bidirectional AC-DC converter | |
US10574086B2 (en) | Nonlinear control algorithm and system for a single-phase AC-AC converter with bidirectional isolated DC-DC converter | |
EP2899836B1 (en) | On-line uninterrupted power supply topology | |
AU2008360120B2 (en) | AC-DC converter, AC-DC converter control method, motor driving device, compressor driving device, air conditioner, and heat pump-type hot-water supply device | |
CN111064359A (en) | Wide-range bidirectional conversion circuit and control method | |
US20160285387A1 (en) | Converter topologies and control | |
CN109756121B (en) | MMC-based isolated DC-DC direct current converter and control method | |
US20150078045A1 (en) | Non-isolated symmetric self-coupling 18-pulse rectifier power supply system | |
JPH10174442A (en) | Converter | |
JP2012044824A (en) | Power conversion device | |
US10270328B2 (en) | Multilevel converter with energy storage | |
CN105529977B (en) | A kind of control system and method for the inhibition zero-sequence current for three phase alternating current motor | |
CN110323774B (en) | Direct-current line fault restarting method, VSC control method and device | |
Ohnuma et al. | A control method for a single-to-three-phase power converter with an active buffer and a charge circuit | |
Jayaprakash et al. | Three-phase 4-wire DSTATCOM based on H-bridge VSC with a star/hexagon transformer for power quality improvement | |
WO2021119793A1 (en) | Control method and system for single-phase converter and single-phase converter | |
Osman et al. | Development of active power filter using rectifier boost technique | |
CN112825427A (en) | Device for effective network-independent intermediate circuit conditioning | |
CN110768551A (en) | AC-DC and DC-DC conversion multiplexing line and method | |
Kong et al. | Wide-range high voltage input auxiliary power supply for modular multi-level converters | |
KR102416374B1 (en) | Apparatus for controlling dc link voltage in power cell of medium voltage inverter | |
Koushki et al. | Zero voltage switching differential inverters | |
CN211930326U (en) | UPS system of fault-tolerant inverter | |
Choi et al. | Parallel system of bidirectional DC/DC converter for improvement of transient response in DC distribution system for building applications |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20848949 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 20848949 Country of ref document: EP Kind code of ref document: A1 |