CN112072689B - Energy feedback type flexible power supply coordination control system and control method - Google Patents

Energy feedback type flexible power supply coordination control system and control method Download PDF

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CN112072689B
CN112072689B CN202011045460.8A CN202011045460A CN112072689B CN 112072689 B CN112072689 B CN 112072689B CN 202011045460 A CN202011045460 A CN 202011045460A CN 112072689 B CN112072689 B CN 112072689B
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voltage
real
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feedforward
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CN112072689A (en
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蒋顺平
丁勇
石祥建
陶征
刘为群
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Engineering 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses an energy feedback type flexible power supply coordination control system and a control method, wherein the energy feedback type flexible power supply coordination control system comprises a preceding-stage three-phase PWM rectifier and a rear-stage one-way inverter, wherein the alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, the alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power distribution network system, and the direct current side of the preceding-stage three-phase PWM rectifier is interconnected with the direct current side of the rear-stage one-way inverter through a direct current bus; the device also comprises a coordinate transformation unit, a power calculation unit, a first feedforward branch circuit, a preceding stage driving pulse generation unit, a second feedforward branch circuit and a subsequent stage driving pulse generation unit. The rapidity of arc extinction of the ground fault is improved through the rear-stage alternating voltage feedforward branch circuit; through the front and rear interstage active power feedforward branch circuits, the problem that the voltage of a direct current bus fluctuates greatly at the moment of starting the flexible power supply is solved, the response speed and the operation reliability of the flexible power supply are improved, and the flexible power supply is simple to realize.

Description

Energy feedback type flexible power supply coordination control system and control method
Technical Field
The invention relates to an energy-feedback flexible power supply coordination control system and a control method, and belongs to the technical field of power electronic equipment application in a power system.
Background
Along with the rapid development of urban power distribution networks, power supply lines in the power distribution networks are increased year by year, and the capacitance current of the system to the ground is increased, so that when the system is in single-phase grounding, grounding electric arcs are generated, and personal safety is damaged.
At present, the flexible power supply gradually becomes a research hotspot in the industry due to the advantages of rapidity, flexibility, accurate arc extinction and the like.
The flexible power supply generally adopts a topological form of preceding-stage three-phase uncontrolled rectification, succeeding-stage single-phase inversion or preceding-stage three-phase PWM rectification and succeeding-stage single-phase inversion, and the latter has the advantages of flexible and adjustable direct-current bus voltage, controllable grid-side current quality and the like compared with the former because preceding-stage energy can flow in two directions.
Because the distribution network system has certain damping ratio to the ground parameter, in order to realize accurate arc extinction, the flexible power supply needs to provide certain active power to the distribution network system. Because the flexible arc extinction power supply needs to ensure the rapidity of arc extinction, the rear-stage single-phase inverter needs to rapidly output a specified current vector or a specified voltage vector, the voltage fluctuation of a direct-current bus is large due to instantaneous active power sudden change, even direct-current under-voltage protection is triggered, and the operation reliability of the feed-type flexible power supply is seriously influenced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an energy-feedback flexible power supply coordination control system and a control method, which can solve the problem of large voltage fluctuation of a direct-current bus while ensuring the arc extinction rapidity of a flexible power supply, and improve the operation reliability and rapidity of the flexible power supply.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
an energy-feedback flexible power supply coordination control system comprises a preceding-stage three-phase PWM rectifier and a subsequent-stage unidirectional inverter, wherein the alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, the alternating current side of the subsequent-stage unidirectional inverter is electrically connected with a power distribution network system, and the direct current side of the preceding-stage three-phase PWM rectifier is interconnected with the direct current side of the subsequent-stage unidirectional inverter through a direct current bus; further comprising:
a coordinate transformation unit: used for carrying out abc-dq phase coordinate conversion on three-phase voltage and three-phase current of a preceding-stage three-phase PWM rectifier to obtain d and q axis voltage components UPd,UPqAnd d, q-axis current components Id,Iq；
A power calculation unit: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo；
A first feed-forward branch: for dependent on d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1Calculating a first feedforward amount;
a preceding stage drive pulse generation unit: for reference voltage according to the DC bus
Figure BDA0002707834800000021
Real-time voltage v of DC busdcD, q axis current component Id,IqGenerating a pre-stage modulation wave by the first feedforward quantity, and modulating the pre-stage modulation wave to generate a driving pulse for driving a switching tube in a pre-stage three-phase PWM rectifier;
a second feed-forward branch: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount;
a subsequent stage drive pulse generating unit: reference output current for a subsequent stage unidirectional inverter
Figure BDA0002707834800000022
Real-time output current iLoAnd the second feedforward quantity generates a rear-stage modulation wave, and modulates the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
In the control system, the pre-stage drive pulse generating unit includes:
the first comparator is used for calculating the reference voltage of the direct current bus
Figure BDA0002707834800000031
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1); the first PI regulator is used for carrying out PI regulation on the voltage deviation of the direct current bus; second comparisonFor calculating the q-axis current component IqAnd a deviation of the q-axis current reference component; the second PI regulator is used for carrying out PI regulation on the deviation calculated and output by the second comparator; the third comparator is used for superposing the regulating quantity output by the first PI regulator and the first feedforward quantity and calculating a superposition result and a d-axis current component IdA deviation of (a); the third PI regulator is used for carrying out PI regulation on the deviation calculated and output by the third comparator; the regulated quantity output by the second PI regulator, the regulated quantity output by the third PI regulator and the d-and q-axis current components Id,IqInputting the cross-decoupled signal to a preceding-stage PWM modulator; the front-stage PWM modulator is used for performing pulse width PWM modulation on the cross decoupling result to generate driving pulses for driving a switching tube in the front-stage three-phase PWM rectifier.
In the above control system, the post-stage drive pulse generating unit includes:
the sixth comparator is used for calculating the reference output current of the rear-stage unidirectional inverter
Figure BDA0002707834800000032
And real-time output current iLoA deviation of (a); the proportional resonance controller is used for carrying out PR adjustment on the deviation of the calculation output of the sixth comparator; the superimposer is used for superimposing the regulating quantity output by the proportional resonance controller and the second feedforward quantity; the rear-stage PWM modulator is used for performing pulse width PWM modulation on the superposition result output by the superimposer so as to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
An energy-feedback type flexible power supply coordination control method comprises a preceding-stage three-phase PWM rectifier and a subsequent-stage one-way inverter, wherein an alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, an alternating current side of the subsequent-stage one-way inverter is electrically connected with a power distribution network system, and a direct current side of the preceding-stage three-phase PWM rectifier and a direct current side of the subsequent-stage one-way inverter are interconnected through a direct current bus; the method comprises the following steps:
performing abc-dq phase coordinate conversion on three-phase voltage and three-phase current of the preceding-stage three-phase PWM rectifier to obtain d-axis and q-axis voltage components UPd,UPqAnd d, q-axis current components Id,Iq；
According to the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo；
According to d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1Calculating a first feedforward amount;
according to the reference voltage of the DC bus
Figure BDA0002707834800000041
Real-time voltage v of DC busdcD, q axis current component Id,IqGenerating a pre-stage modulation wave by the first feedforward quantity, and modulating the pre-stage modulation wave to generate a driving pulse for driving a switching tube in a pre-stage three-phase PWM rectifier;
according to the real-time output voltage u of the backward stage one-way inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount;
according to the reference output current of the backward stage one-way inverter
Figure BDA0002707834800000042
Real-time output current iLoAnd the second feedforward quantity generates a rear-stage modulation wave, and modulates the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
The method for generating the driving pulse for driving the switching tube in the preceding-stage three-phase PWM rectifier comprises the following steps of:
step a, calculating the reference voltage of the direct current bus
Figure BDA0002707834800000043
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1);
step b, performing PI regulation on the voltage deviation of the direct current bus, superposing the regulated quantity with the first feedforward quantity, and further calculating the superposed quantity and a d-axis current component IdAnd performing PI regulation on the deviation;
step c, calculating a q-axis current component IqAnd q axisDeviation of the current reference component, and performing PI regulation on the deviation;
d, the PI regulating quantity output in the step b, the PI regulating quantity output in the step c and the d and q axis current components Id,IqAcquiring a preceding-stage modulation wave after cross decoupling;
and e, performing pulse width PWM modulation on the preceding-stage modulation wave to generate a driving pulse for driving a switching tube in the preceding-stage three-phase PWM rectifier.
The method for generating the driving pulse for driving the switching tube in the rear-stage unidirectional inverter comprises the following steps of:
calculating the reference output current of the backward stage one-way inverter
Figure BDA0002707834800000051
And real-time output current iLoAnd PR adjusting the deviation;
and superposing the PR regulating quantity and the second feedforward quantity, and carrying out pulse width PWM (pulse width modulation) on the superposition result so as to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
In the method, the first feedforward quantity is calculated according to the following formula:
Figure BDA0002707834800000052
wherein λ is1Is a first feedforward coefficient, 0 < lambda1Is less than or equal to 1, when lambda1When the value is 1, the full feed-forward of the active power of the later stage is obtained.
In the above method, the second feedforward amount is calculated according to the following formula:
xff2＝λ2uo
wherein λ is2Is a second feedforward coefficient, 0 < lambda2Is less than or equal to 1, when lambda2When the voltage is equal to 1, the full feed-forward of the alternating voltage of the later stage is realized.
The method outputs real-time active power p at the later stageoThe following formula is adopted for calculation and acquisition:
Figure BDA0002707834800000053
wherein the content of the first and second substances,
Figure BDA0002707834800000054
is the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoAngle of power factor.
Compared with the prior art, the invention has the following beneficial effects: according to the energy-feedback flexible power supply coordination control system and the control method, the rapidness of arc extinction of the ground fault is improved through the rear-stage alternating voltage feedforward branch (namely, the second feedforward branch); through the front and rear interstage active power feedforward branch circuit (namely the first feedforward branch circuit), the problem that the voltage of the direct current bus fluctuates greatly at the moment of starting the flexible power supply is solved, the response speed and the operation reliability of the flexible power supply are improved, and the realization is simple.
Drawings
Fig. 1 is a block diagram of a flexible power supply coordination control system and method according to an embodiment of the invention, in which U1-U6 represent a first comparator to a sixth comparator;
FIG. 2 is a waveform diagram of an experiment in which the system and method according to the embodiment of the present invention are applied to a 400kVA flexible power supply.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The energy-feedback flexible power supply coordination control system shown in fig. 1 comprises a preceding-stage three-phase PWM rectifier and a subsequent-stage unidirectional inverter, wherein the alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, the alternating current side of the subsequent-stage unidirectional inverter is electrically connected with a power distribution network system, and the direct current side of the preceding-stage three-phase PWM rectifier and the direct current side of the subsequent-stage unidirectional inverter are interconnected through a direct current bus; further comprising:
a coordinate transformation unit: used for carrying out abc-dq phase coordinate conversion on three-phase voltage and three-phase current of a preceding-stage three-phase PWM rectifier to obtain d and q axis voltage components UPd,UPqAnd d, q-axis current components Id,Iq。
A power calculation unit: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo。
A first feed-forward branch: for dependent on d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1A first feedforward amount is calculated.
A preceding stage drive pulse generation unit: for reference voltage according to the DC bus
Figure BDA0002707834800000071
Real-time voltage v of DC busdcD, q axis current component Id,IqGenerating a pre-stage modulation wave by the first feedforward quantity, and modulating the pre-stage modulation wave to generate a driving pulse for driving a switching tube in a pre-stage three-phase PWM rectifier;
the pre-stage driving pulse generating unit includes: the first comparator is used for calculating the reference voltage of the direct current bus
Figure BDA0002707834800000072
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1); the first PI regulator is used for carrying out PI regulation on the voltage deviation of the direct current bus; a second comparator for calculating the q-axis current component IqAnd a deviation of the q-axis current reference component; the second PI regulator is used for carrying out PI regulation on the deviation calculated and output by the second comparator; the third comparator is used for outputting the first PI regulatorIs superposed with the first feedforward amount, and the superposition result and the d-axis current component I are calculateddA deviation of (a); the third PI regulator is used for carrying out PI regulation on the deviation calculated and output by the third comparator; the regulated quantity output by the second PI regulator, the regulated quantity output by the third PI regulator and the d-and q-axis current components Id,IqInputting the cross-decoupled signal to a preceding-stage PWM modulator; the front-stage PWM modulator is used for performing pulse width PWM modulation on the cross decoupling result to generate driving pulses for driving a switching tube in the front-stage three-phase PWM rectifier.
A second feed-forward branch: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount;
a subsequent stage drive pulse generating unit: reference output current for a subsequent stage unidirectional inverter
Figure BDA0002707834800000073
Real-time output current iLoGenerating a rear-stage modulation wave by the second feedforward quantity, and modulating the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter;
the latter stage driving pulse generating unit includes: the sixth comparator is used for calculating the reference output current of the rear-stage unidirectional inverter
Figure BDA0002707834800000081
And real-time output current iLoA deviation of (a); the proportional resonance controller is used for carrying out PR adjustment on the deviation of the calculation output of the sixth comparator; the superimposer is used for superimposing the regulating quantity output by the proportional resonance controller and the second feedforward quantity; the rear-stage PWM modulator is used for performing pulse width PWM modulation on the superposition result output by the superimposer so as to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
The coordination control method of the energy-feedback flexible power supply described in this embodiment, as shown in fig. 1, includes the following steps:
performing abc-dq phase coordinate conversion on three-phase voltage and three-phase current of the preceding-stage three-phase PWM rectifier to obtain d-axis and q-axis voltage components UPd,UPqAnd d, q-axis current components Id,Iq；
According to the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo(ii) a The post-stage outputs real-time active power poThe calculation formula is as follows:
Figure BDA0002707834800000082
wherein the content of the first and second substances,
Figure BDA0002707834800000083
is the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoAngle of power factor.
According to d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1Calculating a first feedforward amount; the first feedforward quantity is calculated and obtained according to the following formula:
Figure BDA0002707834800000084
wherein λ is1Is a first feedforward coefficient, 0 < lambda1Is less than or equal to 1, when lambda1When the value is 1, the full feed-forward of the active power of the later stage is obtained.
According to the reference voltage of the DC bus
Figure BDA0002707834800000085
Real-time voltage v of DC busdcD, q axis current component Id,IqAnd generating a preceding-stage modulation wave by the first feedforward quantity, and modulating the preceding-stage modulation wave to generate a driving pulse for driving a switching tube in a preceding-stage three-phase PWM rectifier, wherein the method specifically comprises the following steps:
step a, calculating the reference voltage of the direct current bus
Figure BDA0002707834800000091
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1);
step b, performing PI regulation on the voltage deviation of the direct current bus, superposing the regulated quantity with the first feedforward quantity, and further calculating the superposed quantity and a d-axis current component IdAnd performing PI regulation on the deviation;
step c, calculating a q-axis current component IqAnd q-axis current reference component deviation, and performing PI regulation on the deviation;
d, the PI regulating quantity output in the step b, the PI regulating quantity output in the step c and the d and q axis current components Id,IqAcquiring a preceding-stage modulation wave after cross decoupling;
and e, performing pulse width PWM modulation on the preceding-stage modulation wave to generate a driving pulse for driving a switching tube in the preceding-stage three-phase PWM rectifier.
According to the real-time output voltage u of the backward stage one-way inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount; the second feedforward quantity is calculated and obtained according to the following formula:
xff2＝λ2uo(formula 3)
Wherein λ is2Is a second feedforward coefficient, 0 < lambda2Is less than or equal to 1, when lambda2When the voltage is equal to 1, the full feed-forward of the alternating voltage of the later stage is realized.
According to the reference output current of the backward stage one-way inverter
Figure BDA0002707834800000092
Real-time output current iLoAnd generating a rear-stage modulation wave by the second feedforward quantity, and modulating the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter, wherein the method specifically comprises the following steps:
calculating the reference output current of the backward stage one-way inverter
Figure BDA0002707834800000093
And real-time output current iLoAnd PR adjusting the deviation; adjusting PR by an amountAnd superposing the second feedforward quantity and the second feedforward quantity, and performing pulse width PWM (pulse width modulation) on the superposition result to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
In this embodiment, an experimental waveform obtained by applying the control method to a 400kVA energy-fed flexible power supply is also shown in fig. 2. The 400kVA energy-feedback flexible power supply has the system damping rate of 2 percent, namely, the front-stage three-phase PWM rectifier provides about 80kW active power during arc extinction operation. In this embodiment, λ1＝0.8，λ2When the waveform is visible, the coordination control method is adopted, the rear-stage single-phase inverter quickly responds to the current instruction vector, and the adjusting time is about 45 ms; at the same time, DC bus voltage command
Figure BDA0002707834800000101
The voltage fluctuation peak value of the direct-current bus at the moment of arc extinction and starting of the flexible power supply is less than 85V, the direct-current voltage range (550V-900V) designed for stable operation of the flexible power supply is met, and it needs to be explained here that double-frequency voltage pulsation of the direct-current bus at the steady-state stage in the figure is caused by pulsating power existing on the direct-current side of the single-phase inverter and is irrelevant to the coordination control method related by the invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (9)

1. An energy-feedback flexible power supply coordination control system comprises a preceding-stage three-phase PWM rectifier and a subsequent-stage unidirectional inverter, wherein the alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, the alternating current side of the subsequent-stage unidirectional inverter is electrically connected with a power distribution network system, and the direct current side of the preceding-stage three-phase PWM rectifier is interconnected with the direct current side of the subsequent-stage unidirectional inverter through a direct current bus; it is characterized by also comprising:
a coordinate transformation unit: used for carrying out abc-dq phase coordinate conversion on three-phase voltage and three-phase current of a preceding-stage three-phase PWM rectifier to obtain d and q axis voltage components UPd,UPqAnd d, q axis electricityFlow component Id,Iq；
A power calculation unit: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo；
A first feed-forward branch: for dependent on d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1Calculating a first feedforward amount;
a preceding stage drive pulse generation unit: for reference voltage according to the DC bus
Figure FDA0002707834790000011
Real-time voltage v of DC busdcD, q axis current component Id,IqGenerating a pre-stage modulation wave by the first feedforward quantity, and modulating the pre-stage modulation wave to generate a driving pulse for driving a switching tube in a pre-stage three-phase PWM rectifier;
a second feed-forward branch: for outputting voltage u in real time from a subsequent unidirectional inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount;
a subsequent stage drive pulse generating unit: reference output current for a subsequent stage unidirectional inverter
Figure FDA0002707834790000012
Real-time output current iLoAnd the second feedforward quantity generates a rear-stage modulation wave, and modulates the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
2. The energy-fed flexible power supply coordination control system according to claim 1, wherein said pre-stage driving pulse generation unit comprises:
the first comparator is used for calculating the reference voltage of the direct current bus
Figure FDA0002707834790000013
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1);
the first PI regulator is used for carrying out PI regulation on the voltage deviation of the direct-current bus;
a second comparator for calculating the q-axis current component IqAnd a deviation of the q-axis current reference component;
the second PI regulator is used for carrying out PI regulation on the deviation calculated and output by the second comparator;
the third comparator is used for superposing the regulating quantity output by the first PI regulator and the first feedforward quantity and calculating a superposition result and a d-axis current component IdA deviation of (a);
the third PI regulator is used for carrying out PI regulation on the deviation calculated and output by the third comparator;
the regulated quantity output by the second PI regulator, the regulated quantity output by the third PI regulator and the d-and q-axis current components Id,IqInputting the cross-decoupled signal to a preceding-stage PWM modulator;
the front-stage PWM modulator is used for performing pulse width PWM modulation on the cross decoupling result to generate driving pulses for driving a switching tube in the front-stage three-phase PWM rectifier.
3. The system of claim 1, wherein the post-stage driving pulse generating unit comprises:
the sixth comparator is used for calculating the reference output current of the rear-stage unidirectional inverter
Figure FDA0002707834790000021
And real-time output current iLoA deviation of (a);
the proportional resonance controller is used for carrying out PR adjustment on the deviation of the calculation output of the sixth comparator;
the superimposer is used for superimposing the regulating quantity output by the proportional resonance controller and the second feedforward quantity;
the rear-stage PWM modulator is used for performing pulse width PWM modulation on the superposition result output by the superimposer so as to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
4. An energy-feedback type flexible power supply coordination control method comprises a preceding-stage three-phase PWM rectifier and a subsequent-stage one-way inverter, wherein an alternating current side of the preceding-stage three-phase PWM rectifier is electrically connected with a power supply system, an alternating current side of the subsequent-stage one-way inverter is electrically connected with a power distribution network system, and a direct current side of the preceding-stage three-phase PWM rectifier and a direct current side of the subsequent-stage one-way inverter are interconnected through a direct current bus; characterized in that the method comprises the following steps:
performing abc-dq phase coordinate conversion on three-phase voltage and three-phase current of the preceding-stage three-phase PWM rectifier to obtain d-axis and q-axis voltage components UPd,UPqAnd d, q-axis current components Id,Iq；
According to the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoCalculating the real-time active power p of the output of the later stageo；
According to d-axis voltage component UPdThe real-time active power p is output by the rear stageoAnd a first feedforward coefficient lambda1Calculating a first feedforward amount;
according to the reference voltage of the DC bus
Figure FDA0002707834790000031
Real-time voltage v of DC busdcD, q axis current component Id,IqGenerating a pre-stage modulation wave by the first feedforward quantity, and modulating the pre-stage modulation wave to generate a driving pulse for driving a switching tube in a pre-stage three-phase PWM rectifier;
according to the real-time output voltage u of the backward stage one-way inverteroAnd a second feedforward coefficient lambda2Calculating a second feedforward amount;
according to the reference output current of the backward stage one-way inverter
Figure FDA0002707834790000032
Real-time output current iLoAnd the second feedforward quantity generates a rear-stage modulation wave, and modulates the rear-stage modulation wave to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
5. The coordination control method for the energy-fed flexible power supply according to claim 4, wherein the method for generating the driving pulse for driving the switching tube in the preceding-stage three-phase PWM rectifier comprises the following steps:
step a, calculating the reference voltage of the direct current bus
Figure FDA0002707834790000033
And the real-time voltage v of the DC busdcThe dc bus voltage deviation of (1);
step b, performing PI regulation on the voltage deviation of the direct current bus, superposing the regulated quantity with the first feedforward quantity, and further calculating the superposed quantity and a d-axis current component IdAnd performing PI regulation on the deviation;
step c, calculating a q-axis current component IqAnd q-axis current reference component deviation, and performing PI regulation on the deviation;
d, the PI regulating quantity output in the step b, the PI regulating quantity output in the step c and the d and q axis current components Id,IqAcquiring a preceding-stage modulation wave after cross decoupling;
and e, performing pulse width PWM modulation on the preceding-stage modulation wave to generate a driving pulse for driving a switching tube in the preceding-stage three-phase PWM rectifier.
6. The coordination control method for the energy-fed flexible power supply according to claim 4, wherein the method for generating the driving pulse for driving the switching tube in the backward-stage unidirectional inverter comprises the following steps:
calculating the reference output current of the backward stage one-way inverter
Figure FDA0002707834790000041
And real-time output current iLoAnd PR adjusting the deviation;
and superposing the PR regulating quantity and the second feedforward quantity, and carrying out pulse width PWM (pulse width modulation) on the superposition result so as to generate a driving pulse for driving a switching tube in the rear-stage unidirectional inverter.
7. The coordination control method for the energy-feedback flexible power supply according to claim 4, wherein the first feedforward quantity is obtained by calculation according to the following formula:
Figure FDA0002707834790000042
wherein λ is1Is a first feedforward coefficient, 0 < lambda1Is less than or equal to 1, when lambda1When the value is 1, the full feed-forward of the active power of the later stage is obtained.
8. The coordination control method for the energy-feedback flexible power supply according to claim 4, wherein the second feedforward amount is obtained by calculation according to the following formula:
xff2＝λ2uo
wherein λ is2Is a second feedforward coefficient, 0 < lambda2Is less than or equal to 1, when lambda2When the voltage is equal to 1, the full feed-forward of the alternating voltage of the later stage is realized.
9. The energy feedback type flexible power supply coordination control method according to claim 4, characterized in that the later stage outputs real-time active power poThe following formula is adopted for calculation and acquisition:
Figure FDA0002707834790000051
wherein the content of the first and second substances,
Figure FDA0002707834790000052
is the real-time output voltage u of the backward stage one-way inverteroAnd real-time output current iLoAngle of power factor.
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