CN112165263B - Current harmonic suppression method for three-phase VIENNA rectifier - Google Patents

Current harmonic suppression method for three-phase VIENNA rectifier Download PDF

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CN112165263B
CN112165263B CN202010994565.1A CN202010994565A CN112165263B CN 112165263 B CN112165263 B CN 112165263B CN 202010994565 A CN202010994565 A CN 202010994565A CN 112165263 B CN112165263 B CN 112165263B
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phase
current
signal
voltage
coordinate system
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CN112165263A (en
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游江
周玮
张春雷
王芳瑞
刘刚
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Harbin Engineering University
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Harbin Engineering University
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    • 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
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a three-phase VIENNA rectifier current harmonic suppression method, which gives an output voltage VrefAnd the actual output voltage VoIs passed through a voltage controller to obtain Vm，VmIs obtained by a carrier generation circuit with VmThe high frequency carrier of the peak. The modulated wave is composed of actual current ILa、ILb、ILcCompensation signal I minus current harmonic suppressionar、Ibr、IcrIs multiplied by the sampling resistance RsAnd then the absolute value is obtained. The modulated wave is compared with the carrier wave to obtain a pulse driving signal for driving the power electronic device. The invention adopts a repetitive control technology based on an internal model principle, and can obtain a compensation signal for harmonic current suppression by controlling the harmonic component which periodically changes to zero, thereby realizing the correction of the modulation signal controlled by the traditional single circulator.

Description

Current harmonic suppression method for three-phase VIENNA rectifier
Technical Field
The invention relates to a method for suppressing current harmonics of a three-phase VIENNA rectifier, belonging to the control technology of an AC/DC electric energy conversion device in the technical field of power electronics.
Background
As power electronic devices are more widely used, the stability and reliability of the switching power converter become more and more important. Especially in some application fields with strict requirements on power supply quality, a rectifying device with high power factor and low harmonic content and a control strategy thereof are hot problems of current research. In a three-phase VIENNA rectifier, the problem to be solved urgently is to reduce the current harmonic of a power grid so as to ensure the safe and economic operation of the power grid and user electric equipment. Harmonic pollution of power grid voltage and used power electronic equipment can cause a large amount of harmonic current to be output from a power grid, so that the quality of electric energy is reduced, severe harm can be brought to power generation and supply equipment and user electric equipment, and a power supply or even the electric equipment is damaged. At present, most control modes related to the VIENNA rectifier are controlled by a single period, the control modes are simple, convenient and easy to implement, but current harmonics caused by power grid voltage distortion cannot be effectively suppressed. And most of ways of reducing current harmonics are to add hardware circuits, and the ways have the problems of large volume and large loss. In the VIENNA rectifier, there is a need to develop a simple and efficient control technique with good suppression of current harmonics.
Disclosure of Invention
In view of the above prior art, the technical problem to be solved by the present invention is to provide a method for suppressing current harmonics of a three-phase VIENNA rectifier, which can simply and efficiently reduce the current harmonics on the network side by a control method.
In order to solve the technical problem, the invention provides a method for suppressing current harmonics of a three-phase VIENNA rectifier, which comprises the following steps:
step 1: sampling three-Phase power grid voltage, and obtaining Phase information of each Phase voltage through a Software Phase-Locked Loop (SPLL);
step 2: three-phase inductive current I under a static abc coordinate systemLa、ILb、ILcConverted into two-phase direct current I under synchronous rotation dq coordinate systemLd、ILq；
And step 3: two-phase direct current ILd、ILqPassing through a low-pass filter to obtain ILdAnd ILqDC component I after filtering high-frequency AC signalLd0And ILq0；
And 4, step 4: extracting a two-phase direct current ILd、ILqHigh-frequency harmonic component I ofdhAnd Iqh；
And 5: a duplicate controller is respectively arranged in the d channel and the q channel, IdhAnd IqhRespectively, inputting the repetitive controllers, commanding the repetitive controllers to have reference values of 0, and respectively outputting compensation signals I under dq coordinate system by the repetitive controllersdrAnd Iqr；
Step 6: will IdrAnd IqrCurrent harmonic suppression compensation signal converted into corresponding three-phase static abc coordinate systemNumber Iar、Ibr、Icr；
And 7: obtaining carrier signal, and actually sampling three-phase inductive current ILa、ILb、ILcRespectively subtracting the harmonic suppression compensation signals I of the current on each phase network side corresponding to the currentar、Ibr、IcrObtained Ia、Ib、Ic；
And 8: will Ia、Ib、IcRespectively multiplied by current sampling resistors RsThen taking absolute value to obtain modulation signal | R of each phasesIa|、|RsIbI and RsIc|；
And step 9: modulating wave signal | RsIa|、|RsIbI and RsIcRespectively comparing | with carrier signals to obtain duty ratios da、db、dcRespectively driving a first power switch tube, a second power switch tube and a third power switch tube of the three-phase VIENNA rectifier.
The invention also includes:
the carrier signal obtained in step 7 is specifically: given output voltage VrefAnd the actual output voltage VoSubtracting and obtaining an output signal V after the operation of a PI voltage controllermThe V ismThe signal is obtained by V through a carrier generation circuitmIs the peak carrier signal.
The invention has the beneficial effects that: the invention provides a method for restraining current harmonic waves through a software control method, when the voltage of a power grid contains harmonic waves, the harmonic frequency order is usually integral multiple of the frequency of the fundamental waves, and for a three-phase rectifier, in the traditional single-period control, the equivalent input impedance is pure resistance, so that the negative influence of the voltage harmonic waves of the power grid cannot be effectively restrained. The improved control strategy of the invention extracts the harmonic wave of the current signal under the dq coordinate system, and adopts a repetitive control technology based on an internal model principle, and the compensation signal for harmonic wave current suppression can be obtained by controlling the periodically changed harmonic component to be zero, thereby realizing the correction of the modulation signal controlled by the traditional single circulator. Under the condition that the voltage of the power grid has obvious distortion, the negative influence of the voltage harmonic of the power grid on the current on the side of the power grid can be well inhibited.
Drawings
FIG. 1(a) is a schematic diagram of a three-phase VIENNA rectifier topology;
FIG. 1(b) is a schematic diagram of compensation current signal generation;
FIG. 1(c) is a schematic diagram of an improved single cycle control architecture;
FIG. 2 is a graph of grid voltage and grid side current waveforms under conventional single cycle control;
FIG. 3 is a graph of grid voltage and grid side current waveforms under modified single cycle control;
FIG. 4 is a flow chart of a control method according to the present invention.
In the drawing, Va、Vb、VcFor three-phase mains voltage, ILa、ILb、ILcIs a three-phase inductive current, La、Lb、LcIs a three-phase filter inductor, Sa、Sb、ScIs a bidirectional switch tube, R is an output load, VoIs the output voltage. VrefFor outputting a voltage reference signal, VmFor outputting the output signal of the voltage controller, Iar、Ibr、IcrCompensating the signal for three-phase current, RsTo sample the resistance, ILd、ILqFor signals of three-phase inductive currents in dq coordinate system, ILd0、ILq0For the direct component of the three-phase inductive current in dq coordinate system, Idh、IqhFor harmonic components of three-phase inductive current in dq coordinate system, Idr、IqrIs the output signal via the repetitive controller.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
The invention provides a control method for suppressing current harmonics, which is suitable for a three-phase VIENNA rectifier. The method is improved on the basis of the traditional single-cycle control, the traditional single-cycle control assumes standard sinusoidal grid voltage, and the input current tracks the grid voltage, so that the actual input impedance of the rectifier is purely resistive, and the grid-side current is sinusoidal. However, when the grid voltage has distortion, the conventional single-cycle control can also cause the three-phase input current to generate harmonic waves of the same order, and generate great negative effects on power quality sensitive equipment. The improved single-period control strategy can effectively restrain the negative influence of the voltage distortion of the power grid on the current on the grid side, and achieves the suppression of current harmonics under the condition of obtaining approximate unit power factors.
The main circuit topology of the invention adopts a three-phase VIENNA rectifier as shown in figure 1(a), and is improved on the basis of the traditional single-period control, such as figure 1(c), and the output voltage V is givenrefAnd the actual output voltage VoIs passed through a voltage controller to obtain Vm，VmIs obtained by a carrier generation circuit with VmThe high frequency carrier of the peak. The modulated wave is composed of actual current ILa、ILb、ILcCompensation signal I minus current harmonic suppressionar、Ibr、IcrIs multiplied by the sampling resistance RsAnd then the absolute value is obtained. The modulated wave is compared with the carrier wave to obtain a pulse driving signal for driving the power electronic device.
Obtaining the compensation signal for current harmonic suppression is shown in fig. 1(b), obtaining phase information of a three-phase power grid by using a software phase-locked loop, carrying out dq conversion on the current at the side of the three-phase power grid, separating a direct current component of the current through a low-pass filter, and subtracting the direct current component from the current converted by the original dq to obtain a harmonic current component IdhAnd Iqh. In the d and q channels, I is subtracted from 0dhAnd IqhAnd obtaining a compensation component I for current harmonic suppression in the dq coordinate system through a repetitive controllerdrAnd IqrAnd then inverse transformation from dq to abc is utilized to obtain a compensation component I for current harmonic suppression in the final abc coordinate systemar、Ibr、IcrThereby achieving the purpose of modifying the modulation wave. Under the condition of obtaining approximate unit power factor, electricity is simultaneously realizedSuppression of flow harmonics.
The control method provided by the invention is improved on the basis of the traditional single-cycle control technology and aims at controlling the three-phase VIENNA rectifier. Conventional single cycle controller technology and VIENNA rectifier topology are well established techniques for those skilled in the art.
The following embodiments are specifically made with reference to fig. 4:
(1) in fig. 1(c), the dashed frame portion is an additional net side current harmonic suppression compensation signal introduced on the basis of the conventional single-cycle control. That is, the remaining portion, except for the dashed box portion, represents a conventional one-cycle control strategy.
(2) Sampling three-Phase power grid voltage, and locking the Phase (theta) of the three-Phase voltage of the power grid through a Software Phase-Locked Loop (SPLL)a，θb，θc). On the basis, transformation from a stationary abc coordinate system to a synchronously rotating dq coordinate system can be carried out on three-phase alternating currents. Therefore, three-phase alternating current electric quantity under a static abc coordinate system can be converted into two-phase direct current electric quantity under a synchronous rotation dq coordinate system.
(3) Referring to FIG. 1(b), three-phase inductive current I is converted by using a stationary abc coordinate system to a synchronously rotating dq coordinate systemLa、ILb、ILcIs transformed intoLd、ILq. Respectively mixing ILd、ILqAfter being sent into a low-pass filter, I of high-frequency alternating current signals filtered is obtainedLdAnd ILqDirect current component I ofLd0And ILq0. Make ILdAnd ILqBy subtracting the DC components I respectivelyLd0And ILq0Obtaining the harmonic I of three-phase inductive current existing in the dq coordinate systemdhAnd Iqh. In order to eliminate harmonic component IdhAnd IqhUsing 0 as given value in dq channel, respectively subtracting IdhAnd IqhAnd will bias the signal (i.e., -I)dhand-Iqh) Sending the signals into a repetitive controller for operation to obtain a compensation signal I under a dq coordinate systemdrAnd Iqr. Then, the inverse of the synchronously rotating dq coordinate system to the three-phase stationary abc coordinate system is usedChange will IdrAnd IqrTransformed into a corresponding compensation signal I in a three-phase stationary abc coordinate systemar、Ibr、Icr. The repetitive controller is well known to those skilled in the art and will not be described herein.
(4) In the modified one-cycle control method shown in FIG. 1(c), an output voltage V is givenrefAnd the actual output voltage VoSubtracting and obtaining an output signal V after the operation of a PI voltage controllermThe V ismThe signal is obtained by V through a carrier generation circuitmIs the peak carrier signal. The actually sampled three-phase inductive current ILa、ILb、ILcRespectively subtracting the harmonic suppression compensation signals I of the current on each phase network side corresponding to the currentar、Ibr、IcrObtained Ia、Ib、Ic。
(5) Will Ia、Ib、IcRespectively multiplied by current sampling resistors RsThen taking absolute value to obtain modulation signal | R of each phasesIa|、|RsIbI and RsIc|。
(6) Modulating wave signal | RsIa|、|RsIbI and RsIcRespectively comparing | with carrier signals to obtain duty ratios da、db、dcFor driving the power electronics S shown in fig. 1(a)a、Sb、Sc. When modulating wave signal | RsIa|、|RsIbI and RsIcWhen | is smaller than the carrier signal, the pulse sequence controls the corresponding switch tube to be switched on, otherwise, the switch tube is switched off.
Comparing the power grid voltage and the grid side current waveforms shown in the attached drawings 2 and 3, the method can well inhibit the negative influence of the power grid voltage harmonic on the grid side current under the condition that the power grid voltage has obvious distortion.

Claims (1)

1. A method for suppressing current harmonics of a three-phase VIENNA rectifier is characterized by comprising the following steps:
step 1: sampling three-Phase power grid voltage, and obtaining Phase information of each Phase voltage through a Software Phase-Locked Loop (SPLL);
step 2: sampling three-phase inductive current ILa、ILb、ILcThe three-phase inductive current I under the static abc coordinate systemLa、ILb、ILcConverted into two-phase direct current I under synchronous rotation dq coordinate systemLd、ILq；
And step 3: two-phase direct current ILd、ILqPassing through a low-pass filter to obtain ILdAnd ILqDC component I after filtering high-frequency AC signalLd0And ILq0；
And 4, step 4: extracting a two-phase direct current ILd、ILqHigh-frequency harmonic component I ofdhAnd Iqh；
And 5: a repetitive controller is arranged in the d channel and q channel respectively, and the high-frequency harmonic component IdhAnd IqhRespectively, inputting the repetitive controllers, commanding the repetitive controllers to have reference values of 0, and respectively outputting compensation signals I under dq coordinate system by the repetitive controllersdrAnd Iqr；
Step 6: will compensate the signal IdrAnd IqrConverting into a current harmonic suppression compensation signal I under a corresponding three-phase static abc coordinate systemar、Ibr、Icr；
And 7: given output voltage VrefAnd the actual output voltage VoSubtracting and obtaining an output signal V after the operation of a PI voltage controllermThe output signal VmIs obtained by a carrier generation circuit with VmThe actually sampled three-phase inductive current I is a carrier signal of a peak valueLa、ILb、ILcRespectively subtracting the corresponding current harmonic suppression compensation signals Iar、Ibr、IcrTo obtain Ia、Ib、Ic；
And 8: will Ia、Ib、IcRespectively multiplied by current sampling resistors RsThen taking absolute value to obtain modulation signal | R of each phasesIa|、|RsIbI and RsIc|；
And step 9: modulating signal | RsIa|、|RsIbI and RsIcRespectively comparing | with carrier signals to obtain duty ratios da、db、dcRespectively driving a first power switch tube, a second power switch tube and a third power switch tube of the three-phase VIENNA rectifier.
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CN113162381A (en) * 2021-02-26 2021-07-23 中国船舶重工集团公司第七二三研究所 VIENNA rectifier subharmonic oscillation suppression system
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CN103001250A (en) * 2012-11-20 2013-03-27 深圳市金宏威技术股份有限公司 Compound control method of photovoltaic grid-connected inverter
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CN106229991A (en) * 2016-09-26 2016-12-14 国网上海市电力公司 A kind of Vienna Rectifier being applicable in the case of disturbance occurs in line voltage
CN107659130A (en) * 2017-10-20 2018-02-02 安徽工程大学 A kind of control system and control method of three-phase tri-level VIENNA rectifier
CN110380633A (en) * 2019-07-31 2019-10-25 太原理工大学 A kind of electric current modification method being directed under non-ideal power grid based on one circle control

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CN103001250A (en) * 2012-11-20 2013-03-27 深圳市金宏威技术股份有限公司 Compound control method of photovoltaic grid-connected inverter
CN103368181A (en) * 2013-08-01 2013-10-23 哈尔滨工业大学 Three-phase grid-connected inverter current harmonic suppression method based on LCL-type filter repetitively controlled under two-phase static coordinate system
CN106229991A (en) * 2016-09-26 2016-12-14 国网上海市电力公司 A kind of Vienna Rectifier being applicable in the case of disturbance occurs in line voltage
CN107659130A (en) * 2017-10-20 2018-02-02 安徽工程大学 A kind of control system and control method of three-phase tri-level VIENNA rectifier
CN110380633A (en) * 2019-07-31 2019-10-25 太原理工大学 A kind of electric current modification method being directed under non-ideal power grid based on one circle control

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