CN109687459B - High-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches - Google Patents

High-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches Download PDF

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CN109687459B
CN109687459B CN201811379798.XA CN201811379798A CN109687459B CN 109687459 B CN109687459 B CN 109687459B CN 201811379798 A CN201811379798 A CN 201811379798A CN 109687459 B CN109687459 B CN 109687459B
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current
loop control
open
grid
value
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CN109687459A (en
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季晓春
赵军
洪文瓞
刘建春
刘照清
赵立坤
周智鹏
曹武
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Southeast University
Jiangsu Acrel Electrical Manufacturing Co Ltd
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Jiangsu Acrel Electrical Manufacturing Co Ltd
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    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The invention discloses a high-speed harmonic current open-close loop control method based on current prediction feedforward combined with a plurality of PR resonance branches, which is characterized by comprising the following steps: the forward open-loop branch based on instruction current prediction is superposed on the multi-PR resonance branch, so that the open-loop and closed-loop control is realized, the dynamic performance of the current loop is improved, the superposed current loop can track the instruction current in time when harmonic mutation occurs, and the response speed of an APF system is improved. The method can obviously improve the dynamic characteristic of the current loop on the premise of ensuring that the steady-state performance of the current loop is not influenced, and compared with the traditional APF current loop control method, the method has the advantages of simple algorithm, easy realization, effective technical support for the treatment of the nonlinear impact load harmonic treatment problem, and good feasibility and practical value.

Description

High-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches
Technical Field
The invention belongs to the field of power systems, and particularly relates to a high-speed harmonic current open-close loop control method based on current prediction feedforward combined with a plurality of PR resonance branches.
Background
Active Power Filters (APFs) are becoming the first choice of devices for harnessing harmonic pollution due to their advantages of high controllability and real-time response. With the increasing of nonlinear load harmonic pollution, in the face of impact load with violent power change and large current fluctuation of each harmonic, the dynamic and steady-state performance of APF for harmonic control becomes a research hotspot in the field in recent years. The current loop analysis and control of the APF system are related to the compensation precision and response speed of the whole system, and are key technical problems to be overcome.
The traditional APF current loop control usually adopts a closed loop control mode, and the difference value of the reference current and the actual output current is sent to a controller to realize current tracking. When the load has the characteristics of severe power change, zigzag load curve, high load lifting speed, short interval and the like, the current tracking can be realized only by a plurality of power grid voltage cycles to finish harmonic compensation. Therefore, the real-time performance of the active filter for treating harmonic pollution is greatly reduced. Related documents propose a current tracking method adopting dead-beat control, which is essentially open-loop control, and although the method can effectively increase the response speed of an APF (active power filter) system, the method is too dependent on a system model, the performance is closely combined with system parameters, and the steady-state compensation precision is low.
Disclosure of Invention
The invention aims to overcome the defects and provide a high-speed harmonic current open-close loop control method based on current prediction feedforward combined with a plurality of PR resonance branches, which can obviously improve the dynamic response time of a current loop on the basis of not influencing the steady-state performance of the current loop.
The technical scheme adopted by the invention for solving the problems is as follows:
a high-speed harmonic current open-close loop control method based on current prediction feedforward combined with a plurality of PR resonance branches is characterized in that a forward open-loop voltage based on instruction current prediction is superposed on the plurality of PR resonance closed-loop control branches, and the open-loop voltage is determined by system parameters, instruction current and feedback current;
and has:
Figure 309796DEST_PATH_IMAGE002
Figure 945045DEST_PATH_IMAGE004
Figure 662465DEST_PATH_IMAGE006
wherein:U ref the reference voltage instruction value after the forward path is superposed;U pr a reference command voltage generated for multi-PR resonant closed-loop control;U pred predicting a reference voltage generated for open loop control based on the command current;Treference voltage generated for open loop control based on command current predictionU pred The acting time;Lthe inductance value is the APF grid connection interface inductance value;T s is APF switching period;i L (k +1)is composed ofk+1 moment grid-connected inductance current value;i L (k)is composed ofkCurrent value on the moment grid-connected inductor;e(k)is composed ofkThe voltage value of the power grid at the moment;i Lpred is prepared from (a)k+1) the predicted value of the grid-connected inductive current at the moment.
The high-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches is carried out according to the following steps:
loading APF parameters including an inductance value at a grid-connected interface and an APF switching period;
② samplingkThe current value on the grid-connected inductor and the voltage value of the power grid at the moment are estimated according to the instruction currentk+1 time current value on grid-connected inductori Lpred By passingU pred The expression finds out the reference voltage generated by open-loop control based on command current prediction;
thirdly, the reference voltage is measuredU pred Generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current;
after fourthlykExecuting the step 1-3 at the moment + 1;
fifthly, when (k+1)>At T, the reference voltage generated by open-loop control based on command current prediction is exitedU pred Reference command voltage generated by multi-PR resonant closed-loop controlU pr And generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current.
According to the invention, the forward open-loop branch based on instruction current prediction is superposed on the multi-PR resonance branch, so that the open-loop and closed-loop control is realized, the dynamic performance of the current loop is improved, the superposed current loop can track the instruction current in time when harmonic mutation occurs, and the response speed of the APF system is increased.
Compared with the prior art, the invention has the advantages that:
(1) the high-speed harmonic current open-close loop control method based on the current prediction feedforward combined with the multiple PR resonance branches can obviously improve the dynamic performance of a current loop on the premise of not influencing the steady-state tracking performance of the APF current loop. The method can realize quick tracking in the face of impact load harmonic sources with violent power change and large current fluctuation of each harmonic.
(2) Compared with the traditional APF current loop control method, the open-loop control based on the prediction current is superposed on the basis of the multi-PR resonance closed-loop control, the open-loop and closed-loop control is realized, and the method has the advantages of small operand, simple system design and independence on a system model.
Drawings
FIG. 1 is a flow chart of an APF current loop control method of the present invention;
FIG. 2 is a block diagram of the current prediction feedforward open loop combined with multi-PR resonance closed loop control proposed by the present invention;
fig. 3 is a comparison graph of the fifth harmonic tracking effect of the proposed open-close loop control method based on current prediction feedforward combined with multi-PR resonance branch and multi-PR resonance closed-loop control.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 shows a flow chart of the APF current loop control method of the present invention.
A high-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches is carried out according to the following steps:
loading APF parameters including an inductance value at a grid-connected interface and an APF switching period;
② samplingkThe current value on the grid-connected inductor and the voltage value of the power grid at the moment are estimated according to the instruction currentk+1 time current value on grid-connected inductori Lpred By passingU pred The expression finds out the reference voltage generated by open-loop control based on command current prediction;
thirdly, the reference voltage is measuredU pred Generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current;
after fourthlykExecuting the step 1-3 at the moment + 1;
fifthly, when (k+1)>At T, the reference voltage generated by open-loop control based on command current prediction is exitedU pred Reference command voltage generated by multi-PR resonant closed-loop controlU pr And generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current.
FIG. 2 is a block diagram of the current prediction feedforward open loop combined with multi-PR resonance closed loop control system according to the present invention, the control system outputs a reference voltageU ref Generated by open-loop control based on current predictionU pred And multiple PR resonance closed-loop controlU pr Two parts, and having:
Figure DEST_PATH_IMAGE007
wherein:U ref the reference voltage instruction value after the forward path is superposed;U pr a reference command voltage generated for multi-PR resonant closed-loop control;U pred predicting a reference voltage generated for open loop control based on the command current;Tis based on command electricityReference voltage generated by open loop control of current predictionU pred The acting time;Lthe inductance value is the APF grid connection interface inductance value;T s is APF switching period;i L (k +1)is composed ofk+1 moment grid-connected inductance current value;i L (k)is composed ofkCurrent value on the moment grid-connected inductor;e(k)is composed ofkThe voltage value of the power grid at the moment;i Lpred is prepared from (a)k+1) the predicted value of the grid-connected inductive current at the moment.
FIG. 3 is a comparison graph of the proposed open-close loop control mode based on current prediction feedforward combined with multi-PR resonance branch and the fifth harmonic tracking effect of multi-PR resonance closed-loop control, and the grid-connected parameters are set to be the same (L=4 mH). It can be seen that the multi-PR resonant closed-loop control takes about 0.025 seconds to track the command current, and the command current tracking is achieved about 0.005 seconds after the current prediction feed-forward is added. Therefore, the dynamic performance of the current loop is obviously improved, and the steady-state tracking precision is not influenced.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (1)

1. A high-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches is characterized in that: superposing reference voltage generated by open-loop control based on command current prediction on a multi-PR resonance closed-loop control branch, wherein the reference voltage generated by the open-loop control is determined by system parameters, command current and feedback current;
and has:
Figure DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE004
Figure DEST_PATH_IMAGE006
wherein:U ref the reference voltage instruction value after the forward path is superposed;U pr a reference command voltage generated for multi-PR resonant closed-loop control;U pred predicting a reference voltage generated for open loop control based on the command current;Treference voltage generated for open loop control based on command current predictionU pred The acting time;Lthe inductance value is the APF grid connection interface inductance value;T s is APF switching period;i L (k+1)is composed ofk+1 moment grid-connected inductance current value;i L (k)is composed ofkCurrent value on the moment grid-connected inductor;e(k)is composed ofkThe voltage value of the power grid at the moment;i Lpred is prepared from (a)k+1) a predicted value of the grid-connected inductive current at the moment;
the high-speed harmonic current open-close loop control method based on current prediction feedforward combined with multiple PR resonance branches comprises the following steps:
Figure DEST_PATH_IMAGE008
loading APF parameters including the inductance value at the grid-connected interface and the switching period of the APF;
Figure DEST_PATH_IMAGE010
samplingkThe current value on the grid-connected inductor and the voltage value of the power grid at the moment are estimated according to the instruction currentk+1 moment grid-connected inductive current predicted valuei Lpred By passingU pred The expression finds out the reference voltage generated by open-loop control based on command current prediction;
Figure DEST_PATH_IMAGE012
the reference voltage is adjustedU pred Generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current;
Figure DEST_PATH_IMAGE014
after thatkExecuting the step 1-3 at the moment + 1;
Figure DEST_PATH_IMAGE016
when (A), (B) isk+1) is greater than or equal to T, the reference voltage generated by open-loop control based on command current prediction is exitedU pred Reference command voltage generated by multi-PR resonant closed-loop controlU pr And generating corresponding output voltage through PWM modulation and acting on a grid-connected interface to generate corresponding output current.
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