CN106205308A - A kind of electrical network analog systems and control method thereof - Google Patents

Abstract

A kind of electrical network analog systems disclosed in the present application and control method thereof, including: input module, modular converter, output module and control module, wherein, line voltage is transmitted to modular converter by input module；Modular converter includes Three-Phase PWM Rectifier and three-phase PWM inverter；Control module gathers the electric signal of modular converter outlet side, and the running status of the target grid analog parameter generation modulated signal control three-phase PWM inverter according to user's input, so that described three-phase PWM inverter output target grid waveform.In electrical network simulation process, three-phase PWM inverter is utilized to export target grid waveform, scheme compared in prior art three Single-phase PWM Inverters, due to need not three single-phase between coordinate control, it is ensured that output electric network fault target voltage vector, therefore, control realization is simple, can more accurate simulation network wave, and it is less to take resource.

Description

A kind of electrical network analog systems and control method thereof

Technical field

The application relates to electrical network simulation field, more particularly, it relates to a kind of electrical network analog systems and control method thereof.

Background technology

In recent years, along with increasing distributed generation system accesses electrical network, various countries' grid company is all to distributed Electricity system proposes new strict demand, i.e. requires that distributed generation system can continue to be incorporated into the power networks when electrical grid failure And send idle work rate to support electrical network.Therefore, in the research of distributed generation system, Study system is at these fault conditions Under operation characteristic extremely important.But, owing to the target of electrical network is to provide the three phase sine voltage of standard, various forms of electricity Net fault (such as Voltage Drop, voltage three-phase imbalance etc.) is the most common.Therefore, distributed generation system is being tested Time, need special equipment or instrument to simulate above-mentioned fault.Existing frequently-used a kind of electrical network analog systems, as it is shown in figure 1, adopt With three separate back-to-back system (CCC-0), input side is Three-Phase PWM Rectifier, and outlet side is the controlled single-phase PWM of output voltage Inverter, line voltage accesses Three-Phase PWM Rectifier after three-phase transformer is isolated, more according to this through Single-phase PWM Inverter Export with LC wave filter.

But, use three groups of Single-phase PWM Inverters, need three single-phase between well coordinate control guarantee Output electric network fault target voltage vector, therefore, control realization is more complicated, and the target grid waveform of simulation is inaccurate, and accounts for More by resource.

Summary of the invention

In view of this, the application proposes a kind of electrical network analog systems and control method thereof, is intended to realize in electrical network simulation process In, more accurate simulation target grid waveform, control realization is simple, and takies the less purpose of resource.

A kind of electrical network analog systems, including: input module, modular converter, output module and control module, wherein,

Line voltage is by described input module transmission extremely described modular converter；

Described modular converter includes Three-Phase PWM Rectifier and three-phase PWM inverter, and described Three-Phase PWM Rectifier is used for will Line voltage is converted into DC voltage, and described three-phase PWM inverter is for the DC voltage described Three-Phase PWM Rectifier exported It is converted into alternating voltage；

Described alternating voltage is exported by described output module；

Described control module gathers the electric signal of described modular converter outlet side, and according to the target grid of user's input Analog parameter generates modulated signal and controls the running status of described three-phase PWM inverter, so that the output of described three-phase PWM inverter Target grid waveform.

Preferably, described input module includes: the first transformator and the first wave filter, and described first transformator is for electricity Net voltage carries out boosting or blood pressure lowering；Described first wave filter is used for filtering current harmonics.

Preferably, described first wave filter is: LCL filter.

Preferably, described output module includes: the second wave filter and the second transformator, and described second wave filter is used for filtering Voltage harmonic, it is phase voltage that described second transformator is used for line photovoltaic conversion.

Preferably, described second wave filter is: LC wave filter.

Preferably, described modular converter includes N number of Three-Phase PWM Rectifier and N number of three-phase PWM inverter；Described output mould Block includes N number of LC wave filter；Each described Three-Phase PWM Rectifier connects a described three-phase PWM inverter and a LC according to this Wave filter, described N is the positive integer of more than 2.

A kind of control method of electrical network analog systems, based on above-mentioned electrical network analog systems, described method includes:

Receive the target grid analog parameter of user's input；

Gather described three-phase PWM inverter output electric parameter；

The driving signal of described three-phase PWM inverter is generated according to described electric parameter and target grid analog parameter；

According to described driving signal, control the running status of described three-phase PWM inverter, so that described three-phase PWM inversion Device output target grid waveform.

Preferably, when described target grid analog parameter is voltage three-phase imbalance analog parameter, described in described basis Electric parameter and target grid analog parameter generate the driving signal of described three-phase PWM inverter and include:

Given three-phase voltage value is obtained according to described voltage three-phase imbalance analog parameter

By coordinate transform by the described given three-phase voltage value in rest frameBe converted to rotate Magnitude of voltage in coordinate system

Three-phase voltage value U in the rest frame that described three-phase PWM inverter is exported_a, U_b, U_c, pass through coordinate transform Be converted to the magnitude of voltage U in rotating coordinate system_d, U_q；

By described magnitude of voltageRespectively with described magnitude of voltage U_d, U_qDo difference, and adjust respectively through PIR controller Joint generates current value

Current value I in the rest frame that described three-phase PWM inverter is exported_a, I_b, I_c, changed by coordinate transform For the current value I in rotating coordinate system_d, I_q；

By described current valueRespectively with described current value I_d, I_qDo difference, and enter respectively through PIR controller Row regulation generates modulation voltage value V_d, V_q；

By coordinate transform by the described magnitude of voltage V in rotating coordinate system_d, V_qMagnitude of voltage in convert to static coordinate system U_sa, U_sb, U_sc；

To described magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of described three-phase PWM inverter.

Preferably, when described target grid analog parameter is Voltage Drop analog parameter, described according to described electric ginseng Number and target grid analog parameter generate the driving signal of described three-phase PWM inverter and include:

Given three-phase voltage value is obtained according to described Voltage Drop analog parameter

By coordinate transform by the described given three-phase voltage value in rest frameBe converted to rotate Magnitude of voltage in coordinate system

By the magnitude of voltage in described rotating coordinate systemIt is decomposed into voltage positive-sequence componentWith Voltage negative order components

Three-phase voltage value U in the rest frame that described three-phase PWM inverter is exported_a, U_b, U_c, pass through coordinate transform Be converted to the magnitude of voltage U in rotating coordinate system_d, U_q；

By the magnitude of voltage U in described rotating coordinate system_d, U_qIt is decomposed into voltage positive-sequence component U_dPos, U_qPosDivide with voltage negative phase-sequence Amount U_dNeg, U_qNeg；

By described voltage positive-sequence componentRespectively with described voltage positive-sequence component U_dPo_s, U_qPo_sDo difference, and divide Do not generate electric current positive-sequence component through PIR controller regulationAnd, by described voltage negative order componentsRespectively with described voltage negative order components U_dNeg, U_qNegDo difference, and generate electricity respectively through PIR controller regulation Stream negative sequence component

Current value I in the rest frame that described three-phase PWM inverter is exported_a, I_b, I_c, changed by coordinate transform For the current value I in rotating coordinate system_d, I_q；

By the current value I in described rotating coordinate system_d, I_qIt is decomposed into electric current positive-sequence component I_dPos, I_qPosDivide with electric current negative phase-sequence Amount I_dNeg, I_qNeg；

By described electric current positive-sequence componentRespectively with described electric current positive-sequence component I_dPo_s, I_qPo_sDo difference, and divide Do not generate modulation voltage positive-sequence component V through PIR controller regulation_dPos, V_qPos；And, by described electric current negative sequence componentRespectively with described electric current negative sequence component I_dNeg, I_qNegDo difference, and generate modulation respectively through PIR controller regulation Voltage negative order components V_dNeg, V_qNeg；

By described modulation voltage positive-sequence component V_dPos, V_qPosRespectively with described voltage positive-sequence componentSuperposition, Form final modulation voltage positive-sequence componentAnd, by described modulation voltage negative sequence component V_dNeg, V_qNegRespectively with institute State voltage negative order componentsSuperposition, forms final modulation voltage negative sequence component

By coordinate transform respectively by the described final modulation voltage positive-sequence component in rotating coordinate systemWith Described final modulation voltage negative sequence componentPositive-sequence component in convert to static coordinate system and negative sequence component, and It is overlapped described positive-sequence component respectively with described negative sequence component forming the magnitude of voltage U in rest frame_sa, U_sb, U_sc；

To described magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of described three-phase PWM inverter.

Preferably, target grid analog parameter is: voltage three-phase imbalance analog parameter, Voltage Drop analog parameter, no With voltage and frequency level analog parameter, mains frequency sudden change analog parameter, harmonic wave analog parameter and net voltage fluctuation simulation ginseng Two or more combination of number.

The application proposes a kind of electrical network analog systems and control method thereof, including: input module, modular converter, output mould Block and control module, wherein, line voltage is transmitted to modular converter by input module；Modular converter includes three-phase PWM rectification Device and three-phase PWM inverter；Control module gathers the electric signal of modular converter outlet side, and according to the target electricity of user's input Net analog parameter generates modulated signal and controls the running status of three-phase PWM inverter, so that described three-phase PWM inverter output mesh Mark network wave.In electrical network simulation process, three-phase PWM inverter is utilized to export target grid waveform, compared to prior art In the scheme of three Single-phase PWM Inverters, due to need not three single-phase between coordinate control, it is ensured that output electrical network Fault target voltage vector, therefore, control realization is simple, can more accurate simulation network wave, and it is less to take resource.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to Other accompanying drawing is obtained according to these accompanying drawings.

Fig. 1 is the main circuit schematic diagram of a kind of common electrical network analog systems in prior art；

Fig. 2 is a kind of electrical network analog systems schematic diagram disclosed in the present application；

Fig. 3 is the schematic diagram of a kind of electrical network analog systems disclosed in the present embodiment；

Fig. 4 is the schematic diagram of another kind of electrical network analog systems disclosed in the present embodiment；

Fig. 5 is the flow chart of the control method of a kind of electrical network analog systems disclosed in the present application；

Fig. 6 is the schematic diagram of the control method of a kind of electrical network analog systems disclosed in the present embodiment；

Fig. 7 is the schematic diagram of the control method of another kind of electrical network analog systems disclosed in the present embodiment.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete Describe, it is clear that described embodiment is only some embodiments of the present application rather than whole embodiments wholely.Based on Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of the application protection.

Now the noun of the application design is explained, in order to the understanding to the application scheme:

Degree of unbalancedness: degree of unbalancedness is the negative sequence component root-mean-square valve ratio with negative sequence component root-mean-square valve of electricity, with symbol Number ε represents, i.e.

${\mathrm{\ϵ}}_u=\frac{U_{Neg}}{U_{Pos}}*100\%$

${\mathrm{\ϵ}}_I=\frac{I_{Neg}}{I_{Pos}}*100\%$

In formula, ε_u,ε_IIt is respectively three-phase voltage and current unbalance factor；U_Neg,U_PosVoltage negative phase-sequence, positive-sequence component side respectively All roots；I_Neg,I_PosIt is respectively electric current negative phase-sequence, positive-sequence component root-mean-square valve.

The Voltage Drop degree of depth: the difference of the voltage minimum in load voltage value and falling process.

The Voltage Drop time: Voltage Drop from occur to terminate between continue between.

Disclosure one electrical network analog systems, shown in Figure 2, including: input module 1, modular converter 2, output Module 3 and control module 4, wherein, line voltage is transmitted to modular converter 2 by input module 1；Modular converter includes three-phase PWM rectifier 21 and three-phase PWM inverter 22, Three-Phase PWM Rectifier 21 for being converted into DC voltage, three-phase by line voltage PWM inverter 22 is for being converted into alternating voltage by the DC voltage that Three-Phase PWM Rectifier 21 exports；Three-phase PWM inverter 22 The alternating voltage converted is exported by output module 3；Control module 24 gathers the electric signal of modular converter 2 outlet side, i.e. adopts Three-phase electricity flow valuve I of collection three-phase PWM inverter 22 outlet side_a, I_b, I_cWith three-phase voltage value U_a, U_b, U_c, and input according to user Target grid analog parameter generate modulated signal and control the running status of three-phase PWM inverter, so that described three-phase PWM inversion Device output target grid waveform.

Electrical network analog systems disclosed in the present embodiment, in electrical network simulation process, utilizes three-phase PWM inverter to export target Network wave, compared to the scheme of in prior art three Single-phase PWM Inverters, due to need not three single-phase between assist Regulation and control system, it is ensured that output electric network fault target voltage vector, therefore, control realization is simple, can more accurate simulation electrical network ripple Shape, and it is less to take resource.

Embodiment one

This application discloses a kind of electrical network analog systems, shown in Figure 3, grid stimulating device includes: the first transformator 11, the first wave filter 12, Three-Phase PWM Rectifier 21, electric capacity of voltage regulation 23, three-phase PWM inverter the 22, second wave filter 31, second Transformator 32, current collecting device 41, voltage collecting device 42, input equipment 43, processor 44 and driving means 45, wherein,

First transformator the 11, first wave filter 12, Three-Phase PWM Rectifier 21, electric capacity of voltage regulation 23, three-phase PWM inverter 22, Second wave filter 31 and the second transformator 32 connect according to this.First transformator 11 is for boosting or blood pressure lowering to line voltage； First wave filter 12 is used for filtering current harmonics, improves network side current waveform quality, and the first concrete wave filter 12 filters for LCL Device；Three-Phase PWM Rectifier 21 is for being converted into DC voltage by line voltage (line voltage is alternating voltage)；Electric capacity of voltage regulation 23 For providing galvanic current pressure for three-phase PWM inverter 22；Three-phase PWM inverter 22 is for turning Three-Phase PWM Rectifier The DC voltage changed is converted into alternating voltage；Second wave filter 31 is used for filtering voltage harmonic, is exported by three-phase PWM inverter 22 PWM wave conversion be smooth sine wave, the second concrete wave filter is LC wave filter；Second transformator 32 is for by line voltage (alternating voltage after three-phase PWM inverter 22 converts is line voltage) is converted into phase voltage.

Current collecting device 41 and voltage collecting device 42 are all connected to the outlet side of three-phase PWM inverter 22, use respectively In three-phase electricity flow valuve I gathering three-phase PWM inverter 22 outlet side_a, I_b, I_cWith three-phase voltage value U_a, U_b, U_c, and send to place Reason device 44.Input equipment 43 is used for arranging target grid analog parameter, and sends target grid analog parameter to processor 44. Processor 44 is according to the target grid analog parameter received, three-phase electricity flow valuve I_a, I_b, I_cWith three-phase voltage value U_a, U_b, U_cGenerate The driving signal of the switching tube of three-phase PWM inverter 22；Driving means 45 is according to driving signal control three-phase PWM inverter 22 Switching tube action.Three-phase PWM inverter 22 generates line voltage, and line photovoltaic conversion is phase voltage by the second transformator 32, and input is also Net equipment.

The target grid analog parameter that user utilizes input equipment 43 to arrange can be voltage three-phase imbalance analog parameter, Voltage Drop analog parameter, different voltage and frequency level analog parameter, mains frequency sudden change analog parameter, harmonic wave simulation ginseng One in number and net voltage fluctuation analog parameter, it is also possible to for voltage three-phase imbalance analog parameter, Voltage Drop simulation ginseng Voltages several, different and frequency level analog parameter, mains frequency sudden change analog parameter, harmonic wave analog parameter and net voltage fluctuation Two or more combination in analog parameter.Voltage three-phase imbalance analog parameter includes magnitude of voltage, frequency values, voltage Uneven kind (single-phase imbalance, biphase imbalance and three-phase imbalance) and voltage unbalance factor；Voltage Drop analog parameter Fall including magnitude of voltage, frequency values, Voltage Drop kind (between three-phase, single-phase, two-phase and biphase), the Voltage Drop degree of depth and voltage Fall the time；Different voltages and frequency and frequency level analog parameter include magnitude of voltage, frequency values, frequency grade value and voltage liter Fall rate value；Mains frequency sudden change analog parameter includes magnitude of voltage, frequency values, frequency discontinuity value and frequency discontinuity time；Harmonic wave mould Intend parameter and include magnitude of voltage, frequency values, odd harmonic value, even harmonic value and total harmonic value；Net voltage fluctuation analog parameter includes Magnitude of voltage, frequency values, voltage pulsation amplitude and voltage pulsation frequency.The different target electricity that user is arranged by input equipment 43 Net analog parameter realizes the simulation to different electric network faults.

Embodiment two

This application discloses another kind of electrical network analog systems, shown in Figure 4, with embodiment one disclosed in the difference of scheme It is that Three-Phase PWM Rectifier 21, electric capacity of voltage regulation 23, three-phase PWM inverter 22 and LC wave filter are multiplex and arrange, i.e. includes many Individual Three-Phase PWM Rectifier 21, each Three-Phase PWM Rectifier 21 connects 23, PWM inverter 22 and of an electric capacity of voltage regulation according to this One LC wave filter.Designed and the application of LCL filter by the multiplex of Three-Phase PWM Rectifier 21, use multiplex, control Algorithm processed, translates current harmonics toward high band so that the higher hamonic wave of net side is greatly reduced, then coordinates 5,7 low-order harmonics Elimination algorithm, can optimize current on line side harmonic wave significantly, promotes the electrical network friendliness of system；By three-phase PWM inverter 22 and LC The multiplex design of wave filter, in conjunction with 5,7 low-order harmonic elimination algorithms, can optimize various pattern (except harmonic wave is simulated) significantly Voltage waveform quality.

The control method of disclosure a kind of electrical network analog systems, shown in Figure 5, based on above-mentioned electrical network simulation be System, the method includes:

Step S11: receive the target grid analog parameter of user's input.

Step S12: gathering three-phase PWM inverter output electric parameter, electric parameter includes three-phase electricity flow valuve I_a, I_b, I_cWith Three-phase voltage value U_a, U_b, U_c。

Step S13: generate the driving signal of three-phase PWM inverter according to institute's electric parameter and target grid analog parameter.

Step S14: according to driving signal, control the running status of three-phase PWM inverter, so that three-phase PWM inverter is defeated Go out target grid waveform.

The control method of electrical network analog systems disclosed in the present embodiment, in electrical network simulation process, it is not necessary to three single-phase Between coordinate control, it is ensured that output electric network fault target voltage vector, therefore, control realization is simple, can be more accurate Simulating grid waveform, and it is less to take resource.

Embodiment three

The control method of disclosure a kind of electrical network analog systems, shown in Figure 6, this control method is voltage three-phase Uneven analog control method, including:

Step S21: obtain given three-phase voltage value according to voltage three-phase imbalance analog parameter

The voltage three-phase imbalance analog parameter of user's input includes that magnitude of voltage, frequency values, Voltage unbalance kind are (single-phase Imbalance uneven, biphase and three-phase imbalance) and voltage unbalance factor.Processor is according to magnitude of voltage, Voltage unbalance kind And voltage unbalance factor obtains given three-phase voltage value

Step S22: by coordinate transform by the three-phase voltage value in rest frameBe converted to rotate Magnitude of voltage in coordinate system

Static coordinate is tied to the transformation matrix C of rotating coordinate system_3s/2r:

$C_{3s/2r}=\left[\begin{array}{ccc}{\mathrm{cos\θ}}^{*}& cos({\mathrm{\θ}}^{*}-2\mathrm{\π}/3)& cos({\mathrm{\θ}}^{*}+2\mathrm{\π}/3)\\ {\mathrm{sin\θ}}^{*}& sin({\mathrm{\θ}}^{*}-2\mathrm{\π}/3)& sin({\mathrm{\θ}}^{*}+2\mathrm{\π}/3)\end{array}\right]$

Wherein θ^*For the anglec of rotation of coordinate transform, θ^*=∫ ω^*Dt, ω^*=2 π f^*, ω^*For angular frequency (rad/s), f^*For The frequency values of user's input, i.e. the frequency of target voltage.

Step S23: three-phase voltage value U in the rest frame that three-phase PWM inverter is exported_a, U_b, U_cBecome by coordinate Change the magnitude of voltage U be converted in rotating coordinate system_d, U_q。

Step S24: by magnitude of voltageRespectively with magnitude of voltage U_d, U_qDo difference, and adjust respectively through PIR controller Joint generates current value

Control traditional PI to control to combine with R (Resonant) resonance, build PIR controller, it is possible to controlling to become Negative sequence component, fundametal compoment and harmonic component in amount are respectively controlled, it is achieved quickly following flutter component.Concrete The transmission function of PIR controller is:

$G_{PIR}=K_P+\frac{K_I}{s}+\frac{K_{n1}{\mathrm{\ω}}_{c1}s}{s^2+2{\mathrm{\ω}}_{c1}s+{\[-2{\mathrm{\ω}}_0\]}^2}+\frac{K_{n2}{\mathrm{\ω}}_{c2}s}{s^2+2{\mathrm{\ω}}_{c2}s+{\[(n\±1){\mathrm{\ω}}_0\]}^2}$

In formula, K_P, K_IIt is respectively proportionality coefficient and integral coefficient；K_n1, K_n2Resonance coefficient for resonant controller；ω_c1, ω_c2For the cut-off frequency of resonant controller, s=j ω is differential operator, the expression shape of the transmission function expression of control system Formula, ω₀For electrical network angular frequency, ω₀=2 π f₀, f₀For common frequency power network frequency, f₀=50Hz.

Step S25: the current value I that three-phase PWM inverter is exported_a, I_b, I_c, be converted to rotational coordinates by coordinate transform Current value I in system_d, I_q。

Rotational coordinates is tied to the transformation matrix C of rest frame_2r/3s:

$C_{2r/3s}=\left[\begin{array}{cc}{\mathrm{cos\θ}}^{*}& {\mathrm{sin\θ}}^{*}\\ \cos ({\mathrm{\θ}}^{*}-2\mathrm{\π}/3)& \sin ({\mathrm{\θ}}^{*}-2\mathrm{\π}/3)\\ \cos ({\mathrm{\θ}}^{*}+2\mathrm{\π}/3)& \sin ({\mathrm{\θ}}^{*}+2\mathrm{\π}/3)\end{array}\right]$

Wherein θ^*For the anglec of rotation of coordinate transform, θ^*=∫ ω^*Dt, ω^*=2 π f^*, ω^*For angular frequency (rad/s), f^*For The frequency values of user's input, i.e. the frequency of target voltage.

Step S26: by current valueRespectively with current value I_d, I_qDo difference, and enter respectively through PIR controller Row regulation generates modulation voltage value V_d, V_q。

Step S27: by coordinate transform by the magnitude of voltage V in rotating coordinate system_d, V_qElectricity in convert to static coordinate system Pressure value U_sa, U_sb, U_sc。

Step S28: to magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of three-phase PWM inverter.

Embodiment four

The control method of disclosure a kind of electrical network analog systems, shown in Figure 7, this control method is Voltage Drop Analog control method, including:

Step S31: obtain given three-phase voltage value according to Voltage Drop analog parameter

User input Voltage Drop analog parameter include magnitude of voltage, frequency values, Voltage Drop kind (three-phase, single-phase, two Between Xiang and biphase), the Voltage Drop degree of depth and Voltage Drop time.Processor is according to magnitude of voltage, Voltage Drop kind and electricity Pressure falls the degree of depth, obtains given three-phase voltage valueAnd within the Voltage Drop time, keep this given three-phase electricity Pressure value

Step S32: by coordinate transform by the given three-phase voltage value in rest frameConversion For the magnitude of voltage in rotating coordinate system

Step S33: by the magnitude of voltage in rotating coordinate systemIt is decomposed into voltage positive-sequence componentWith voltage negative order components

Step S34: by three-phase voltage value U in the rest frame of institute's three-phase PWM inverter output_a, U_b, U_c, by sitting Mark conversion is converted to the magnitude of voltage U in rotating coordinate system_d, U_q；

Step S35: by the magnitude of voltage U in rotating coordinate system_d, U_qIt is decomposed into voltage positive-sequence component U_dPos, U_qPOs and voltage negative Order components U_dNeg, U_qNeg。

Step S36: by institute's voltage positive-sequence componentRespectively with voltage positive-sequence component U_dPos, U_qPosDo difference, and Electric current positive-sequence component is generated respectively through PIR controller regulationAnd, by voltage negative order components Respectively with voltage negative order components U_dNeg, U_qNegDo difference, and generate electric current negative sequence component respectively through PIR controller regulation

Step S37: the current value I in the rest frame that three-phase PWM inverter is exported_a, I_b, I_c, pass through coordinate transform Be converted to the current value I in rotating coordinate system_d, I_q。

Step S38: by the current value I in institute's rotating coordinate system_d, I_qIt is decomposed into electric current positive-sequence component I_dPos, I_qPosAnd electric current Negative sequence component I_dNeg, I_qNeg。

Step S39: by electric current positive-sequence componentRespectively with electric current positive-sequence component I_dPos, I_qPosDo difference, and difference Modulation voltage positive-sequence component V is generated through PIR controller regulation_dPos, V_qPos；And, by electric current negative sequence componentPoint Not and electric current negative sequence component I_dNeg, I_qNegDo difference, and generate modulation voltage negative sequence component V respectively through PIR controller regulation_dNeg, V_qNeg。

Step S310: by modulation voltage positive-sequence component V_dPos, V_qPosRespectively with voltage positive-sequence componentFolded Add, form final modulation voltage positive-sequence componentAnd, by modulation voltage negative sequence component V_dNeg, V_qNegRespectively with electricity Pressure negative sequence componentSuperposition, forms final modulation voltage negative sequence component

Step S311: by coordinate transform respectively by final for the institute in rotating coordinate system modulation voltage positive-sequence componentWith final modulation voltage negative sequence componentPositive-sequence component in convert to static coordinate system and negative phase-sequence Component, and be overlapped positive-sequence component respectively with negative sequence component forming the magnitude of voltage U in rest frame_sa, U_sb, U_sc。

Step S312: to institute magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of three-phase PWM inverter.

The control method of above-mentioned Voltage Drop simulation is by Voltage loop outer shroud and electric current loop internal ring double-closed-loop control, compares Voltage loop monocycle controls, and adds electric current loop, and the information of load change is added into control system, the response of internal ring electric current loop own Speed is than Voltage loop outer shroud fast response time, and current inner loop quickly follows load change, will promote global voltage current double closed-loop The response speed of control system.Relying on merely outer voltage, only follow according to voltage, response speed is less than voltage x current Two close cycles；Given voltage it is superimposed with on the basis of voltage and current double closed-loopConstitute Feedforward link, improves system dynamics response performance again.Can quickly follow given voltageChange, raw Become Voltage Drop waveform, it is achieved Voltage Drop is simulated.

For aforesaid each method embodiment, in order to be briefly described, therefore it is all expressed as a series of combination of actions, but Being that those skilled in the art should know, the application is not limited by described sequence of movement, because according to the application, certain A little steps can use other orders or carry out simultaneously.

In this article, the relational terms of such as first and second or the like is used merely to an entity or operation with another One entity or operating space separate, and there is any this reality between not necessarily requiring or imply these entities or operating Relation or order.And, term " includes ", " comprising " or its any other variant are intended to the bag of nonexcludability Contain, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include Other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment. In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that including described key element Process, method, article or equipment in there is also other identical element.

In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other The difference of embodiment, between each embodiment, identical similar portion sees mutually.

Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the application. Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can realize in the case of without departing from spirit herein or scope in other embodiments.Therefore, the application It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one The widest scope caused.

Claims (10)

1. an electrical network analog systems, it is characterised in that including: input module, modular converter, output module and control module, Wherein,

Line voltage is by described input module transmission extremely described modular converter；

Described modular converter includes Three-Phase PWM Rectifier and three-phase PWM inverter, and described Three-Phase PWM Rectifier is for by electrical network Photovoltaic conversion is DC voltage, and described three-phase PWM inverter converts for the DC voltage described Three-Phase PWM Rectifier exported For alternating voltage；

Described alternating voltage is exported by described output module；

Described control module gathers the electric signal of described modular converter outlet side, and according to the target grid simulation of user's input Parameter generates modulated signal and controls the running status of described three-phase PWM inverter, so that described three-phase PWM inverter output target Network wave.

System the most according to claim 1, it is characterised in that described input module includes: the first transformator and the first filter Ripple device, described first transformator is for boosting or blood pressure lowering to line voltage；It is humorous that described first wave filter is used for filtering electric current Ripple.

System the most according to claim 2, it is characterised in that described first wave filter is: LCL filter.

System the most according to claim 1, it is characterised in that described output module includes: the second wave filter and second becomes Depressor, described second wave filter is used for filtering voltage harmonic, and it is phase voltage that described second transformator is used for line photovoltaic conversion.

System the most according to claim 4, it is characterised in that described second wave filter is: LC wave filter.

System the most according to claim 5, it is characterised in that described modular converter includes N number of Three-Phase PWM Rectifier and N Individual three-phase PWM inverter；Described output module includes N number of LC wave filter；Each described Three-Phase PWM Rectifier connects one according to this Described three-phase PWM inverter and a LC wave filter, described N is the positive integer of more than 2.

7. the control method of an electrical network analog systems, it is characterised in that based on the electricity described in claim 1 to 6 any one Net analog systems, described method includes:

Receive the target grid analog parameter of user's input；

Gather described three-phase PWM inverter output electric parameter；

The driving signal of described three-phase PWM inverter is generated according to described electric parameter and target grid analog parameter；

According to described driving signal, control the running status of described three-phase PWM inverter, so that described three-phase PWM inverter is defeated Go out target grid waveform.

Control method the most according to claim 7, it is characterised in that be voltage three-phase at described target grid analog parameter During uneven analog parameter, described generate described three-phase PWM inverter according to described electric parameter and target grid analog parameter Driving signal include:

Given three-phase voltage value is obtained according to described voltage three-phase imbalance analog parameter

By coordinate transform by the described given three-phase voltage value in rest frameBe converted to rotational coordinates Magnitude of voltage in system

Three-phase voltage value U in the rest frame that described three-phase PWM inverter is exported_a, U_b, U_c, changed by coordinate transform For the magnitude of voltage U in rotating coordinate system_d, U_q；

By described magnitude of voltageRespectively with described magnitude of voltage U_d, U_qDo difference, and raw respectively through PIR controller regulation Become current value

Current value I in the rest frame that described three-phase PWM inverter is exported_a, I_b, I_c, be converted to rotation by coordinate transform Turn the current value I in coordinate system_d, I_q；

By described current valueRespectively with described current value I_d, I_qDo difference, and be adjusted respectively through PIR controller Generate modulation voltage value V_d, V_q；

By coordinate transform by the described magnitude of voltage V in rotating coordinate system_d, V_qMagnitude of voltage U in convert to static coordinate system_sa, U_sb, U_sc；

To described magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of described three-phase PWM inverter.

Control method the most according to claim 7, it is characterised in that be Voltage Drop at described target grid analog parameter During analog parameter, the described driving generating described three-phase PWM inverter according to described electric parameter and target grid analog parameter Signal includes:

Given three-phase voltage value is obtained according to described Voltage Drop analog parameter

By coordinate transform by the described given three-phase voltage value in rest frameBe converted to rotational coordinates Magnitude of voltage in system

By the magnitude of voltage in described rotating coordinate systemIt is decomposed into voltage positive-sequence componentAnd voltage Negative sequence component

Three-phase voltage value U in the rest frame that described three-phase PWM inverter is exported_a, U_b, U_c, changed by coordinate transform For the magnitude of voltage U in rotating coordinate system_d, U_q；

By the magnitude of voltage U in described rotating coordinate system_d, U_qIt is decomposed into voltage positive-sequence component U_dPos, U_qPosWith voltage negative order components U_dNeg, U_qNeg；

By described voltage positive-sequence componentRespectively with described voltage positive-sequence component U_dPo_s, U_qPo_sDo difference, and warp respectively Cross PIR controller regulation and generate electric current positive-sequence componentAnd, by described voltage negative order componentsPoint Not with described voltage negative order components U_dNeg, U_qNegDo difference, and generate electric current negative sequence component respectively through PIR controller regulation

Current value I in the rest frame that described three-phase PWM inverter is exported_a, I_b, I_c, be converted to rotation by coordinate transform Turn the current value I in coordinate system_d, I_q；

By the current value I in described rotating coordinate system_d, I_qIt is decomposed into electric current positive-sequence component I_dPos, I_qPosWith electric current negative sequence component I_dNeg, I_qNeg；

By described electric current positive-sequence componentRespectively with described electric current positive-sequence component I_dPos, I_qPosDo difference, and respectively through PIR controller regulation generates modulation voltage positive-sequence component V_dPos, V_qPos；And, by described electric current negative sequence componentPoint Not with described electric current negative sequence component I_dNeg, I_qNegDo difference, and generate modulation voltage negative sequence component respectively through PIR controller regulation V_dNeg, V_qNeg；

By described modulation voltage positive-sequence component V_dPos, V_qPosRespectively with described voltage positive-sequence componentSuperposition, is formed Final modulation voltage positive-sequence componentAnd, by described modulation voltage negative sequence component V_dNeg, V_NegRespectively with described electricity Pressure negative sequence componentSuperposition, forms final modulation voltage negative sequence component

By coordinate transform respectively by the described final modulation voltage positive-sequence component in rotating coordinate systemWith described Final modulation voltage negative sequence componentPositive-sequence component in convert to static coordinate system and negative sequence component, and by institute State positive-sequence component to be overlapped respectively with described negative sequence component forming the magnitude of voltage U in rest frame_sa, U_sb, U_sc；

To described magnitude of voltage U_sa, U_sb, U_scCarry out SPWM modulation and generate the driving signal of described three-phase PWM inverter.

Method the most according to claim 7, it is characterised in that target grid analog parameter is: voltage three-phase imbalance mould Intend parameter, Voltage Drop analog parameter, different voltage and frequency level analog parameter, mains frequency sudden change analog parameter, harmonic wave Two or more combination of analog parameter and net voltage fluctuation analog parameter.