CN108322076B - Voltage-sharing control system and method for parallel H-bridge type converter of alternating current system - Google Patents

Voltage-sharing control system and method for parallel H-bridge type converter of alternating current system Download PDF

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CN108322076B
CN108322076B CN201810141406.XA CN201810141406A CN108322076B CN 108322076 B CN108322076 B CN 108322076B CN 201810141406 A CN201810141406 A CN 201810141406A CN 108322076 B CN108322076 B CN 108322076B
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voltage
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CN108322076A (en
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刘增
刘进军
刘仡然
周正源
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Xi'an Singularity Energy Co ltd
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Xian Jiaotong 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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  • Supply And Distribution Of Alternating Current (AREA)
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Abstract

The invention discloses a voltage-sharing control method of an AC system parallel H-bridge type converter, which is characterized in that a reactive component instruction value is introduced into an AC voltage controller, and reactive current deviation is generated by voltage deviation of a direct current side of each module in a direct current voltage balancing controller, so that active power redistribution among the modules is realized under the condition of not influencing the total active power of the whole converter, and further, the balance control of the direct current side voltage of each module is realized.

Description

Voltage-sharing control system and method for parallel H-bridge type converter of alternating current system
Technical Field
The invention belongs to the technical field of power electronic converter control, and particularly relates to a voltage-sharing control system and method for an alternating current system parallel H-bridge type converter.
Background
With the access of more and more power electronic elements in an alternating current power system, the interaction between the power electronic elements is easy to cause the problem of stability of a system small signal, and the problem can be analyzed by observing the relation between the impedance of each port on a system bus, so that the measurement of the impedance of the port in actual engineering is important for analyzing the stability of the system. The basic principle of the impedance measurement of the port of the alternating current system is as follows: firstly, current or voltage disturbance with certain amplitude at a specific frequency is injected into a system port, then the voltage or current response of the port at the frequency is extracted, and further the port impedance at the frequency is calculated. Disturbance injection is the most critical link in the whole impedance measurement because the disturbance needs to be injected into the power port and needs to bear the high voltage or large current of the system.
The disturbance injection comprises two types of parallel injection and series injection, wherein the parallel injection is used for accurately measuring a port with low impedance on a bus, and the series injection is used for accurately measuring a port with high impedance. At present, two main implementation modes of series disturbance injection are provided, namely a bridge type converter based on a coupling transformer and a parallel H-bridge type converter, wherein the bridge type converter and the parallel H-bridge type converter avoid the coupling transformer, can realize low-frequency disturbance injection, and have important significance for realizing broadband impedance measurement.
Fig. 1 shows a basic structure of a parallel H-bridge type converter, taking the number N of H-bridge modules equal to 3 as an example, and since a capacitor on a direct current side of the parallel H-bridge type converter is suspended, the voltage of the parallel H-bridge type converter needs to be controlled; meanwhile, in order to equally divide the system current among the modules, the alternating-current side current of each module needs to be controlled. Fig. 2 shows an overall structure of a parallel H-bridge converter control system, which first receives a disturbance voltage command from an upper controller, then collects dc-side voltages of modules, ac-side currents of the modules, output ac voltages and system currents, and outputs control signals after the control signals are processed by the control system to control on/off of fully-controlled power semiconductor devices in the H-bridge modules, so that the output voltage of an ac output port includes a disturbance voltage component.
In the existing parallel H-bridge type converter control system, when the current amplitude of the system is small, the balance control between the direct-current side voltages of all modules can be realized, and at the moment, all voltages are equal; when the current amplitude of the system is larger than a certain specific value (and the specific value is far smaller than a rated value), the direct-current side voltage of each module cannot be realized, and at the moment, the voltages have large difference, so that overvoltage protection can be triggered to cause shutdown, and the running range of the parallel H-bridge type converter is severely limited. In addition, in the prior art, voltage balance control of each direct current side is realized by connecting an extra resistor in parallel on each module direct current side to realize larger system current amplitude, the scheme can improve the system current amplitude operation range to a certain extent, but the introduction of the extra resistor leads to the increase of the device volume and the increase of system loss.
Disclosure of Invention
The invention aims to provide a voltage-sharing control system and method for an alternating current system parallel H-bridge type converter, which overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme.
A voltage-sharing control method for an alternating current system parallel H-bridge type converter comprises the following steps:
step 1), obtaining an alternating current voltage active component amplitude instruction value v through an average direct current voltage controllerCpm *；
Step 2), obtaining system current i through a phase-locked loopSThe cosine value and sine value of the fundamental component phase theta;
step 3), obtaining a unified alternating current instruction value i of each H-bridge module according to the alternating voltage active component amplitude instruction value obtained in the step 1) and the cosine value and the sine value of the fundamental component phase theta obtained in the step 2) through an alternating voltage controllerL *；
Step 4), obtaining alternating current deviation instruction values i of all H-bridge modules through the direct current voltage balance controllerLdk *；
Step 5) unifying the alternating current unified command value i output by the alternating voltage controllerL *And an alternating current deviation instruction value i output by the direct current voltage balance controllerLdk *After the addition, the corresponding H-bridge module alternating current instruction value i is obtainedLk *(ii) a Then i isLk *Actual alternating current i of corresponding H-bridge moduleLkAfter difference is made, the difference is used as the input of an alternating current regulator, and the output of the alternating current regulator is the corresponding duty ratio d of the H-bridge modulekAnd the voltage-sharing control of the H-bridge type converter can be realized by inputting the voltage-sharing control signal to the pulse width modulator connected with each H-bridge module.
Further, in step 1), firstly, the average DC voltage controller collects the DC side voltage v of each H-bridge moduledckThen, the voltage v at the DC side of each H-bridge module is calculated by an AVE module in an average DC voltage controllerdckAverage value of (2)
Figure GDA0002188584110000031
The direct current voltage command value vdc *And the average value
Figure GDA0002188584110000032
After differencing, the voltage is used as a DC voltage regulator GVDCTo obtain an alternating currentVoltage active component amplitude command value vCpm *。
Further, in step 2), the phase-locked loop collects the system current, filters noise therein, and outputs a phase θ of a fundamental component of the system current:
iS1＝ISmcosθ
wherein iS1For instantaneous value of fundamental component of system current, ISmIs the fundamental current amplitude.
Further, in step 3), the cosine value of the phase theta of the fundamental wave component obtained in step 2) and the amplitude command value v of the active component of the alternating current voltage output by the average direct current voltage controller in step 1) are used for calculating the amplitude of the active component of the alternating current voltageCpm *Multiplying, and simultaneously obtaining the sine value of the phase theta of the fundamental component and a given amplitude command value v of the reactive component of the alternating voltage according to the step 2)Cqm *Multiplying, adding the two products and superposing the upper-level command value v of the AC voltagep *Obtaining an alternating voltage command value vC *(ii) a The command value v of the alternating voltageC *Subtracting the sampled actual value v of the AC voltageCThe obtained value is an AC voltage regulator GVCInputting to obtain the unified command value i of the alternating current of each H-bridge moduleL *。
Further, in the step 4), the direct current voltage of each H-bridge module is collected by the direct current voltage balance controller and the average value of the direct current voltages of the H-bridge modules is calculated
Figure GDA0002188584110000033
Then average value
Figure GDA0002188584110000034
Respectively at each H-bridge module DC voltage vdckTaking difference to obtain the deviation between the DC voltage of each H-bridge module and the average value thereof, and taking the deviation as the DC voltage balance regulator G of each H-bridge moduleILTThen multiplying the sine value of the fundamental component phase theta obtained in the step 2) with the output of each H-bridge module direct-current voltage balance regulator to obtain the alternating-current deviation instruction value i of each H-bridge moduleLdk *。
A voltage-sharing control system of an alternating current system parallel H-bridge type converter comprises an average direct current voltage controller, a phase-locked loop, an alternating current voltage controller, a direct current voltage balancing controller, an alternating current controller and a pulse width modulator, wherein the output end of the average direct current voltage controller is connected to the input end of the alternating current voltage controller;
the average DC voltage controller is used for acquiring an AC voltage active component amplitude command value vCpm *，
The phase-locked loop is used for acquiring system current iSThe phase of the fundamental component of (a) theta,
the alternating voltage controller is used for acquiring the uniform alternating current instruction value i of each H-bridge moduleL *,
The DC voltage balance controller is used for acquiring an AC current deviation instruction value i of each H-bridge moduleLdk *；
The pulse width modulator is used for converting the control duty ratio of each H-bridge module into an on-off control signal of the power semiconductor device in the corresponding H-bridge module.
Furthermore, the alternating current controllers and the pulse width modulators are correspondingly connected with the H-bridge modules one by one.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a voltage-sharing control method of an AC system parallel H-bridge type converter, which is characterized in that a reactive component instruction value is introduced into an AC voltage controller, and reactive current deviation is generated by the voltage deviation of the DC side of each H-bridge module in a DC voltage balancing controller, so that the active power between each H-bridge module is redistributed under the condition of not influencing the total active power of the whole converter, and further the balance control of the DC side voltage of each H-bridge module is realized.
Drawings
Fig. 1 is a main circuit diagram of a parallel H-bridge type converter.
Fig. 2 shows the overall structure of the control system of the present invention.
Fig. 3 shows an internal structure of the average dc voltage controller according to the present invention.
Fig. 4 shows an internal structure of the ac voltage controller according to the present invention.
Fig. 5 shows an internal structure of the dc voltage balance controller according to the present invention.
Fig. 6 shows the internal structure of an ac current controller according to the present invention.
Fig. 7 is an experimental waveform diagram of the voltage-sharing control method provided by the invention.
Fig. 8 is an experimental waveform diagram using a conventional control method.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in figure 1, the parallel H-bridge type converter comprises N parallel H-bridge modules, N is not less than 2, the inside of each H-bridge module is formed by connecting four full-control type power semiconductor devices with 4 anti-parallel diodes, and the direct current side of each H-bridge module is connected to a respective direct current capacitor CkThe AC side is passed through an inductor LkAfter being connected in parallel, the output port is connected with an alternating current capacitor C in parallelp(ii) a The parallel H-bridge type converter is connected in series in an ac system, and a system current flows in from one output terminal thereof and flows out from the other terminal thereof.
As shown in fig. 2 to 6, a parallel H-bridge converter control system includes an average dc voltage controller, a phase-locked loop, an ac voltage controller, the output end of the average direct-current voltage controller is connected to the input end of the alternating-current voltage controller, the output end of the phase-locked loop is connected to the input end of the alternating-current voltage controller and the input end of the direct-current voltage balance controller, the output end of the alternating-current voltage controller and the output end of the direct-current voltage balance controller are both connected to the input end of the alternating-current controller, the alternating-current controller is connected with the pulse width modulator, the pulse width modulator is used for converting the control duty ratio of each H-bridge module into an on-off control signal of a power semiconductor device in the corresponding H-bridge module, and the alternating-current controller and the pulse width modulator are both connected with the H-bridge modules in a one-to-;
the average DC voltage controller is used for acquiring an AC voltage active component amplitude command value vCpm *，
The phase-locked loop is used for acquiring system current iSThe phase of the fundamental component of (a) theta,
the alternating voltage controller is used for acquiring the uniform alternating current instruction value i of each H-bridge moduleL *，
The DC voltage balance controller is used for acquiring an AC current deviation instruction value i of each H-bridge moduleLdk *，
The pulse width modulator is used for converting the control duty ratio of each H-bridge module into an on-off control signal of the power semiconductor device in the corresponding H-bridge module.
A voltage-sharing control method for an alternating current system parallel H-bridge type converter comprises the following steps:
step 1), obtaining an alternating current voltage active component amplitude instruction value v through an average direct current voltage controllerCpm *；
Step 2), obtaining system current i through a phase-locked loopSThe cosine value and sine value of the fundamental component phase theta;
step 3), obtaining a unified alternating current instruction value i of each H-bridge module according to the alternating voltage active component amplitude instruction value obtained in the step 1) and the cosine value and the sine value of the fundamental component phase theta obtained in the step 2) through an alternating voltage controllerL *；
Step 4), obtaining alternating current deviation instruction values i of all H-bridge modules through the direct current voltage balance controllerLdk *；
Step 5) unifying the alternating current unified command value i output by the alternating voltage controllerL *And an alternating current deviation instruction value i output by the direct current voltage balance controllerLdk *After the addition, the corresponding H-bridge module alternating current instruction value i is obtainedLk *(ii) a Then i isLk *Actual alternating current i of corresponding H-bridge moduleLkAfter difference is made, the difference is used as the input of an alternating current regulator, and the output of the alternating current regulator is the corresponding duty ratio d of the H-bridge modulekAnd the voltage-sharing control of the H-bridge type converter can be realized by inputting the voltage-sharing control signal to the pulse width modulator connected with each H-bridge module.
In the step 1), firstly, the DC side voltage v of each H-bridge module is collected by an average DC voltage controllerdckThen, the voltage v at the DC side of each H-bridge module is calculated by an AVE module in an average DC voltage controllerdckAverage value of (2)
Figure GDA0002188584110000061
The direct current voltage command value vdc *And the average value
Figure GDA0002188584110000062
After differencing, the voltage is used as a DC voltage regulator GVDCTo obtain the amplitude command value v of the active component of the alternating voltageCpm *；
DC voltage regulator GVDCA proportional integral regulator is adopted;
in the step 2), the phase-locked loop collects system current, filters noise in the system current, and outputs a fundamental component phase theta of the system current;
iS1＝ISmcosθ
wherein iS1For instantaneous value of fundamental component of system current, ISmIs the fundamental current amplitude.
In step 2), obtaining system current i through a phase-locked loopSCalculating the cosine value and the sine value of the fundamental component phase theta;
in step 3), the cosine value of the fundamental component phase theta obtained in step 2) is usedAnd step 1) averaging the amplitude command value v of the active component of the alternating voltage output by the direct voltage controllerCpm *Multiplying, and simultaneously obtaining the sine value of the phase theta of the fundamental component and a given amplitude command value v of the reactive component of the alternating voltage according to the step 2)Cqm *Multiplying, adding the two products and superposing the upper-level command value v of the AC voltagep *Obtaining an alternating voltage command value vC *(ii) a The command value v of the alternating voltageC *Subtracting the sampled actual value v of the AC voltageCThe obtained value is an AC voltage regulator GVCInputting to obtain the unified command value i of the alternating current of each H-bridge moduleL *；
In the step 4), the direct current voltage of each H-bridge module is collected through the direct current voltage balance controller, and the average value of the direct current voltages is calculated
Figure GDA0002188584110000071
Then average value
Figure GDA0002188584110000072
Respectively at each H-bridge module DC voltage vdckTaking difference to obtain the deviation between the DC voltage of each H-bridge module and the average value thereof, and taking the deviation as the DC voltage balance regulator G of each H-bridge moduleILTThen multiplying the sine value of the fundamental component phase theta obtained in the step 2) with the output of each H-bridge module direct-current voltage balance regulator to obtain the alternating-current deviation instruction value i of each H-bridge moduleLdk *；
As shown in fig. 7 and 8, the control method of the present invention and the conventional control method are tested under the same system current condition, in the test, the amplitude of the fundamental wave of the system current is 24A, the frequency of the system fundamental wave is 60Hz, and the direct-current voltage command value v is measureddc *130V, obtaining a time domain waveform diagram by using a four-channel oscilloscope for measurement, wherein FIG. 7 is a waveform diagram adopting the control method provided by the invention, FIG. 8 is a waveform diagram adopting a traditional control method, and a channel 1 is a #1H bridge module direct-current voltage Vdc1Channel 2 is #2H bridge module DC voltage vdc2Channel 3 is an alternating voltage vCChannel 4 is the system current iS；
According to experimental test waveforms, the direct current voltages of the modules are obviously unbalanced in the traditional control method, and the deviation between the direct current voltages exceeds 10V.

Claims (7)

1. A voltage-sharing control method for an alternating current system parallel H-bridge type converter is characterized by comprising the following steps;
step 1), obtaining an alternating current voltage active component amplitude instruction value v through an average direct current voltage controllerCpm *；
Step 2), obtaining system current i through a phase-locked loopSCosine and sine values of the fundamental component phase theta;
step 3), obtaining an alternating voltage active component amplitude instruction value v according to the step 1) through an alternating voltage controllerCpm *And step 2) obtaining cosine values and sine values of fundamental component phase theta to obtain unified command values i of alternating currents of all H-bridge modulesL *；
Step 4), obtaining alternating current deviation instruction values i of all H-bridge modules through the direct current voltage balance controllerLdk *；
Step 5) unifying the alternating current unified command value i output by the alternating voltage controllerL *And an alternating current deviation instruction value i output by the direct current voltage balance controllerLdk *After the addition, the corresponding H-bridge module alternating current instruction value i is obtainedLk *(ii) a Then i isLk *Actual alternating current i of corresponding H-bridge moduleLkAfter difference is made, the difference is used as the input of an alternating current regulator, and the output of the alternating current regulator is the corresponding duty ratio d of the H-bridge modulekAnd the voltage-sharing control of the H-bridge type converter can be realized by inputting the voltage-sharing control signal to the pulse width modulator connected with each H-bridge module.
2. The parallel H-bridge of claim 1 for AC systemThe voltage-sharing control method of the type converter is characterized in that in the step 1), the voltage v at the direct current side of each H-bridge module is collected by an average direct current voltage controllerdckThen, the voltage v at the DC side of each H-bridge module is calculated by an AVE module in an average DC voltage controllerdckAverage value of (2)
Figure FDA0002188584100000011
The direct current voltage command value vdc *And the average value
Figure FDA0002188584100000012
After differencing, the voltage is used as a DC voltage regulator GVDCTo obtain the amplitude command value v of the active component of the alternating voltageCpm *。
3. The voltage-sharing control method for the parallel H-bridge type converter of the alternating current system according to claim 1, wherein in the step 2), the phase-locked loop collects the system current, filters noise in the system current, and outputs a phase θ of a fundamental component of the system current:
iS1＝ISmcosθ
wherein iS1For instantaneous value of fundamental component of system current, ISmIs the fundamental current amplitude.
4. The voltage-sharing control method for the parallel H-bridge type converter of the alternating current system according to claim 1, wherein in the step 3), the cosine value of the phase θ of the fundamental component obtained in the step 2) and the amplitude command value v of the active component of the alternating current voltage output by the average direct current voltage controller in the step 1) are obtainedCpm *Multiplying, and simultaneously obtaining the sine value of the phase theta of the fundamental component and a given amplitude command value v of the reactive component of the alternating voltage according to the step 2)Cqm *Multiplying, adding the two products and superposing the upper-level command value v of the AC voltagep *Obtaining an alternating voltage command value vC *(ii) a The command value v of the alternating voltageC *Subtracting the sampled actual value v of the AC voltageCThe obtained value is an AC voltage regulator GVCInputting to obtain the unified command value i of the alternating current of each H-bridge moduleL *。
5. The voltage-sharing control method for the parallel H-bridge type converter of the alternating current system according to claim 1, wherein in the step 4), the direct current voltage of each H-bridge module is collected by the direct current voltage-sharing controller and the average value of the direct current voltages is calculated
Figure FDA0002188584100000021
Then average value
Figure FDA0002188584100000022
Respectively at each H-bridge module DC voltage vdckTaking difference to obtain the deviation between the DC voltage of each H-bridge module and the average value thereof, and taking the deviation as the DC voltage balance regulator G of each H-bridge moduleILTThen multiplying the sine value of the fundamental component phase theta obtained in the step 2) with the output of each H-bridge module direct-current voltage balance regulator to obtain the alternating-current deviation instruction value i of each H-bridge moduleLdk *。
6. A control system based on the voltage-sharing control method of the AC system parallel H-bridge type converter is characterized by comprising an average DC voltage controller, a phase-locked loop, an AC voltage controller, a DC voltage balancing controller, an AC current controller and a pulse width modulator, wherein the output end of the average DC voltage controller is connected to the input end of the AC voltage controller, the output end of the phase-locked loop is connected to the input end of the AC voltage controller and the input end of the DC voltage balancing controller, the output end of the AC voltage controller and the output end of the DC voltage balancing controller are both connected to the input end of the AC current controller, and the AC current controller is connected with the pulse width modulator;
the average DC voltage controller is used for acquiring an AC voltage active component amplitude command value vCpm *，
The phase-locked loop is used for acquiring system current iSThe phase of the fundamental component of (a) theta,
the alternating voltage controller is used for acquiring the uniform alternating current instruction value i of each H-bridge moduleL *，
The DC voltage balance controller is used for acquiring an AC current deviation instruction value i of each H-bridge moduleLdk *，
The pulse width modulator is used for converting the control duty ratio of each H-bridge module into an on-off control signal of the power semiconductor device in the corresponding H-bridge module.
7. The control system of the voltage-sharing control method of the alternating current system parallel H-bridge type converter according to claim 6, wherein the alternating current controllers and the pulse width modulators are connected with the H-bridge modules in a one-to-one correspondence manner.
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