CN217848963U - Building energy router with intelligent switch array - Google Patents
Building energy router with intelligent switch array Download PDFInfo
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- CN217848963U CN217848963U CN202221531288.1U CN202221531288U CN217848963U CN 217848963 U CN217848963 U CN 217848963U CN 202221531288 U CN202221531288 U CN 202221531288U CN 217848963 U CN217848963 U CN 217848963U
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Abstract
The utility model discloses a building energy router with intelligence switch array relates to power electronic technology field. The utility model discloses to traditional building microgrid power distribution system structure be difficult to effectively utilize distributed power source's intermittent type nature, randomness and volatility and the problem of the poor scheduling problem of output electric energy quality, the switching that sets up intelligent switch array between two direct current bus comes control load and energy has been proposed. The utility model discloses compare with traditional building microgrid distribution system structure, can be through controlling switch array, carry out classification management to power consumption load and distributed generator, guaranteed the power supply electric energy quality of important load, realize the UPS function to when two bus voltage fluctuate, can control switch array, let distributed generator and direct current load participate in the busbar voltage balance. The utility model discloses improve system operation mode, the efficiency is synthesized to the lift system, realizes distributed generator nearby consumption and the high-efficient step utilization of various energy sources.
Description
Technical Field
The utility model relates to a building energy router with intelligence switch array relates to power electronic technology field.
Background
In order to deal with energy crisis and environmental deterioration, clean and environment-friendly renewable energy sources have been developed greatly under the condition of rapid development of power electronics and computer technologies at present. Renewable energy sources, however, present many challenges when incorporated into the power grid due to their randomness, volatility, and intermittency. In order to fully utilize renewable energy, the concept of "energy internet" is proposed, and its core energy router receives a great deal of attention.
The energy routers may be classified by their structures into solid-state transformer-based energy routers, multiport structure-based energy routers, and power communication line-based energy routers. Among them, the energy router based on the solid-state transformer has wide application in the regional level and the building level.
The building power supply has the characteristics of multiple load types, alternating current and direct current mixing, multiple voltage grades and the like. The traditional building power distribution network needs a large amount of DC/AC, AC/DC and DC/DC converters to meet various load power supply requirements, if an energy router is adopted to supply power for urban building buildings, the area of the top of a building can be fully utilized, the new energy can be generated and consumed in place, the energy abandoning and transmission loss can be reduced, the loss of alternating current-direct current conversion can be reduced, and the aims of flexible energy distribution and efficient energy utilization can be achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a topological structure of building energy router with intelligence switch array and the control method who corresponds power electronic device, the energy router that proposes can allow load or the energy to switch between the direct current generating line of difference, has improved the flexibility of equipment switching and the reliability of system operation.
In order to realize the purpose, the utility model discloses a technical scheme is:
a building energy router with an intelligent switch array comprises a single-phase AC/DC converter, a high-frequency isolation type DC/DC converter, a three-phase DC/AC converter and a switch array, wherein an AC port of the single-phase AC/DC converter is connected with a single-phase alternating current power grid, and a DC port of the single-phase AC/DC converter is connected with the left side of the high-frequency isolation type DC/DC converter and provides a low-voltage direct current bus; an AC port of the three-phase DC/AC converter is connected with a three-phase alternating current network, a DC port of the three-phase DC/AC converter is connected with the right side of the high-frequency isolation type DC/DC converter and provides a high-voltage direct current bus, and a switch array is arranged between the low-voltage direct current bus and the high-voltage direct current bus.
The utility model relates to a building energy router with intelligence switch array, building energy router still includes the sampling unit, and the sampling unit gathers the output voltage and the post-filter output current of single-phase AC/DC converter, high frequency isolated form DC/DC converter and three-phase DC/AC converter.
The utility model relates to a building energy router with intelligence switch array, the controller includes voltage loop regulating unit and electric current loop regulating unit, the power flow direction control unit of high frequency isolated form DCDC, the voltage regulation unit and the switch array optional unit of each one-way/two-way DCDC converter of the voltage loop regulating unit and the electric current loop regulating unit of each converter.
The utility model relates to a building energy router with intelligence switch array, switch array is used for the one-way DC converter of control connection load, the two-way DC converter of the connection energy and the being connected of direct current bus.
Due to the adoption of the technical scheme, the utility model discloses compare prior art and have following beneficial effect:
1) The utility model relates to a building energy router with intelligence switch array compares with traditional building microgrid distribution system structure, can provide multiple voltage level, the plug-and-play interface that the alternating current-direct current mixes, and the extensive access of fully promoting the clean energy of distributing type renewable and the nimble access of load satisfy source-net-load cooperative demand.
2) The utility model relates to a building energy router with intelligence switch array compares with traditional building microgrid distribution system structure, through two DC bus, select switch and two-way DC's coordinated control, improves system operation, realizes the highly reliable supply to various loads, multiple energy form, and the efficiency is synthesized to the lift system, realizes distributed power source and consumes nearby and the high-efficient step utilization of various energy sources.
3) The utility model relates to a building energy router with intelligence switch array compares with traditional building microgrid distribution system structure, and two direct current bus exist electrical isolation, and it all does not influence the opposite side not to break down when any one side of two-way DCDC converter.
4) Compared with the traditional building microgrid power distribution system structure, the building energy router with the intelligent switch array has the advantages that the switch array carries out classified management on the power load and the distributed power supply, on one hand, the power supply and electric energy quality of important loads is guaranteed, and the UPS function is realized; on the other hand, the defects of intermittent power supply, poor output electric energy quality and the like of the distributed power supply are overcome more flexibly.
5) The utility model relates to a building energy router with intelligence switch array compares with traditional building microgrid distribution system structure, when two busbar voltage fluctuation, except through controlling intermediate level converter, can also control the switch array, lets distributed generator and direct current load participate in bus voltage balance.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a topological structure of a totem pole PFC of a single-phase AC/DC converter of a building energy router with an intelligent switch array according to the present invention;
FIG. 2 is a control block diagram of a single-phase AC/DC converter of a building energy router with an intelligent switch array according to the present invention;
FIG. 3 is a topological structure of a T-NPC circuit of a three-phase DC/AC converter of a building energy router with an intelligent switch array according to the present invention;
FIG. 4 is a control block diagram of a three-phase DC/AC converter of a building energy router with an intelligent switch array according to the present invention;
fig. 5 is a block diagram of a building energy router with an intelligent switch array according to the present invention;
fig. 6 is a block diagram of a controller of a building energy router with an intelligent switch array according to the present invention;
fig. 7 is the utility model relates to a building energy router's direct current bus work subregion with intelligence switch array.
Detailed Description
In order to better understand the technical solution of the present invention, the following description is made with reference to the accompanying drawings for further describing the working principle and the embodiments of the present invention. The following examples or figures are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The first embodiment is as follows: in the building energy router with the intelligent switch array, the single-phase AC/DC converter of the building energy router needs to realize bidirectional energy flow, the physical topology of the building energy router can be a totem-pole PFC, and the bridge arm side of the PFC is connected with an LCL filter, as shown in fig. 1. When the single-phase AC/DC converter is located in an inversion mode, the inverter grid-connected operation needs to control grid-connected power, LCL capacitance current is selected as feedback quantity, active damping control is carried out, grid-connected power is controlled by controlling the magnitude of inductance current at the grid side of an LCL filter, and the method specifically comprises the following steps: calculating the amplitude I of the expected value of the grid-side inductive current according to the grid-connected power reg And collecting network side voltage U g The phase angle cos theta is obtained through the phase-locked loop and is equal to I reg Multiplying as the command current I 1 * Will command a current I 1 * And collecting network side inductive current I 1 Differencing to obtain an error signal Δ I 1 Input to the current outer ring PI regulator, output of the current outer ring PI regulator and collect the capacitance current I C Performing difference, and inputting the obtained output signal to a current inner loop PI regulator to obtain a duty ratio D; comparing the obtained duty ratio D with a carrier to obtain a single-phase AC/DC converter switch control signal for controlling single-phase AC/DC conversionThe on-off action of a power switch in the device. The control flow is shown in fig. 2.
When the single-phase AC/DC converter is in a rectification mode, the network side inductive current can be indirectly controlled to track the voltage phase of a power grid by controlling the inductive current at the side of a bridge arm.
The second embodiment: in the building energy router with the intelligent switch array, a three-phase DC/AC converter needs to realize bidirectional energy flow, the physical topology of the router can be a three-level neutral point clamped (T-NPC) converter, and the bridge arm side of the T-NPC is connected with an LCL filter, as shown in FIG. 3. When the three-phase DC/AC converter is in a rectification mode, a double closed-loop control technology is adopted, a voltage loop is used as an outer loop, and the output of the voltage loop is used as an inner loop reference value for stabilizing the voltage of a direct-current bus; the current loop is used as an inner loop and is used for tracking and controlling the voltage phase of the power grid by current. The specific method comprises the following steps: reference value U of direct current bus DC-ref And the measured value U DC Differencing to obtain an error signal Δ U DC Error signal Δ U DC Obtaining a d-axis current reference value i after the action of a voltage PI regulator 3d-ref (ii) a Reference value of q-axis current i 3q-ref Setting the current reference value of the dq axis to be 0, and respectively subtracting the obtained current reference value of the dq axis from the actually measured current value of the grid side to obtain error signals delta I d 、ΔI q Error signal Δ I d 、ΔI q And after passing through the current PI regulator, obtaining a reference value of the dq axis voltage of the alternating current side through feedforward compensation, further generating a control signal, and controlling the on-off action of a power switch in the three-phase DC/AC converter by the control signal. When the three-phase DC/AC converter is in an inversion mode, a single-loop control mode is adopted; the specific method comprises the following steps: removing electricity in rectification modePressing an outer ring to reference the q-axis current value i 3q-ref Set as a reference value i of 1,d-axis current 3d-ref And setting the current reference value of the dq axis as 0, respectively comparing the current reference value of the dq axis with the actually measured current value of the dq axis of the network side, obtaining the reference value of the voltage of the dq axis of the alternating current side through feed-forward compensation after the difference value passes through a current PI regulator, and further generating a control signal which controls the on-off action of a power switch in the three-phase DC/AC converter. The control flow is shown in fig. 4.
Example three: fig. 5 is a block diagram of a building energy router with an intelligent switch array according to this embodiment, and the building energy router of the present invention mainly includes a single-phase AC/DC converter, a high-frequency isolated DC/DC converter, a three-phase DC/AC converter, a switch array, a sampling unit, and a controller. In one working mode, single-phase alternating current is filtered by an LCL filter and rectified into direct current of 400V by a single-phase AC/DC converter to provide direct current Bus DC Bus 1; the three-phase alternating current is filtered by an LCL filter and rectified into 750V direct current by a three-phase DC/AC converter, and direct current Bus DC Bus 2 is provided. The high-frequency isolation type DC/DC is connected with the two direct current buses, and the functions of energy transfer and electrical isolation are realized. A switch array is arranged between the two direct current buses, and the switch array is used for electrically isolating the two direct current buses and switching loads and energy.
Fig. 6 is a block diagram of a controller of a building energy router with an intelligent switch array according to the embodiment. The controller is used as a control core, comprehensively coordinates the operation of the inverter and comprises a voltage loop control unit, a current loop control unit (if the voltage loop control unit and the current loop control unit exist) and a switch array selection unit of each single-phase converter. The voltage loop adjusting unit can adjust the working state of each converter and the duty ratio of the switching device at any time according to the fluctuation of input voltage, so that the output voltage stabilization of the converters is realized, and the current loop is used for improving the rapidity of response and controlling grid-connected power during grid-connected inversion. And the switch selection controller makes a decision according to the quality of the electric energy provided by the two buses and the working mode, and controls the action of the switch array.
FIG. 7 shows a building energy road with an intelligent switch array according to this embodimentWork partitioning of the router. The horizontal and vertical coordinates are the per unit value U of the bus voltage of the two buses j,pu In a manner of calculation of
Wherein j =1,2 is an energy router direct current bus, U j Is the j-th bus voltage actual value, U, of the energy router j,max Is the maximum value of the j-th bus voltage, U j,min Is the jth bus voltage minimum.
According to whether the power grid and the stored energy participate in power balance, the operation mode of the energy router can be specifically divided into 3 scenes, and 19 modes are provided. And DAB has three kinds of operating condition: migration power (voltage reference dynamic adjustment); a voltage stabilization mode in which the voltage reference value does not change once the power flow direction is determined; shutdown mode, which DAB does not migrate power. And the switch array is switched according to the working states of different equipment in different modes.
In fig. 7, the regions where both dc bus voltages of the energy router operate within the qualified range [ -1,1] are: zone A, zone B, zone C and zone D; the areas where both dc bus voltages are operating in the off-specification range are: E. f, G and H. The voltage of two direct current buses in the area E is larger than 1, which indicates that the power of the whole system of the energy router is excessive, at the moment, if the power grid and the energy storage participate in power balance, the excessive power is fed back to the power grid or the energy storage device, and if the power grid and the energy storage do not participate in power balance, the photovoltaic enters a power-limiting constant-voltage mode; and the voltages of two direct current buses in the H area are both less than-1, which indicates the power shortage of the whole system of the energy router, at the moment, if the power grid and the energy storage participate in power balance, the insufficient power is compensated by the power grid and the energy storage, and if the power grid and the energy storage do not participate in power balance, the translatable load is cut off according to the load type. DAB will not migrate power when the energy router is operating in zone E and zone H. One direct current bus voltage operates in a qualified range, and the other direct current bus voltage operates in an unqualified range in the following areas: I. j, K, L, M, N, O, P region. When the energy router operates in a zone other than an E zone and an H zone, firstly, the DAB is considered to transfer unbalanced power on two direct current buses, if the two direct current buses still operate in an unqualified range after the DAB transfers the power, the unbalanced power is transferred by a power grid and stored energy, and otherwise, the photovoltaic enters a power limiting mode or enters a load shedding mode.
The above description is only the preferred embodiments of the present invention, and these embodiments are all based on the different implementation manners of the present invention, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A building energy router having an array of intelligent switches, the building energy router comprising: the system comprises a single-phase AC/DC converter, a high-frequency isolation type DC/DC converter, a three-phase DC/AC converter and a switch array, wherein an AC port of the single-phase AC/DC converter is connected with a single-phase AC power grid, and a DC port of the single-phase AC/DC converter is connected with the left side of the high-frequency isolation type DC/DC converter and provides a low-voltage DC bus; the AC port of the three-phase DC/AC converter is connected with a three-phase alternating current network, the DC port of the three-phase DC/AC converter is connected with the right side of the high-frequency isolation type DC/DC converter and provides a high-voltage direct current bus, and a switch array is arranged between the low-voltage direct current bus and the high-voltage direct current bus.
2. The building energy router with the intelligent switch array as claimed in claim 1, further comprising a sampling unit, wherein the sampling unit collects output voltages and filtered output currents of the single-phase AC/DC converter, the high-frequency isolated DC/DC converter and the three-phase DC/AC converter.
3. The building energy router with intelligent switch arrays as claimed in claim 1, further comprising a controller, wherein the controller comprises a single-phase AC/DC converter voltage loop control unit, a single-phase AC/DC converter current loop control unit, a three-phase DC/AC converter voltage loop control unit, a three-phase DC/AC converter current loop control unit, a high frequency isolated DC/DC power flow direction control unit, each of the unidirectional, bidirectional DC/DC converter voltage loop control units and a switch array selection unit.
4. A building energy router with intelligent switch arrays as claimed in claim 1 or 3, wherein: the switch array is connected with the unidirectional DC/DC converter, the bidirectional DC/DC converter and the direct current bus, and the switch array selection unit makes a decision according to the quality of electric energy provided by the two buses and the working mode and controls the action of the switch array.
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| CN202221531288.1U CN217848963U (en) | 2022-06-16 | 2022-06-16 | Building energy router with intelligent switch array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117674147A (en) * | 2023-12-05 | 2024-03-08 | 燕山大学 | Multi-microgrid-accessed double-direct-current bus architecture single-phase electric energy router |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117674147A (en) * | 2023-12-05 | 2024-03-08 | 燕山大学 | Multi-microgrid-accessed double-direct-current bus architecture single-phase electric energy router |
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