CN108448660A - Alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition method based on hierarchical control - Google Patents

Alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition method based on hierarchical control Download PDF

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Publication number
CN108448660A
CN108448660A CN201810237650.6A CN201810237650A CN108448660A CN 108448660 A CN108448660 A CN 108448660A CN 201810237650 A CN201810237650 A CN 201810237650A CN 108448660 A CN108448660 A CN 108448660A
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current
voltage
output end
phase
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CN108448660B (en
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张佰富
韩肖清
王金浩
雷达
常潇
李慧勇
张世峰
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Taiyuan University of Technology
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Electric Power Research Institute of State Grid Shanxi Electric Power 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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
    • H02M7/81—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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 arranged for operation in parallel

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a kind of alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition methods.Alternating current-direct current mixing micro-capacitance sensor is made of exchange subnet and direct current subnet, and two subnets are connected by bidirectional power transverter in parallel.Carried control method can realize that the power between alternating current-direct current subnet interacts, and carry out power support each other, can carry out grid-connected taking over seamlessly with island mode.Controlling unit includes mainly that autonomous operation control controls two parts with loop current suppression.Autonomous control link is for the different feature of alternating current-direct current busbar voltage property, according to subnet admissible voltage fluctuation range, has carried out normalized to it respectively, has realized power bi-directional smooth transfer between alternating current-direct current subnet.Loop current suppression link replaces traditional two axis of dq control using the control of tri- axis of dq0, for parallel inverter since switch motion is asynchronous, circulation problem caused by device model difference etc., the circulation inhibition method extracted based on positive-sequence component is provided, the circulation between bi-directional inverter in parallel can effectively be inhibited to generate.

Description

Alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition method based on hierarchical control
Technical field
The present invention relates to bidirectional power converter circulation inhibition method in parallel, Neng Gouzhen in a kind of alternating current-direct current mixing micro-capacitance sensor Circulation problem when to bidirectional power converter parallel running control effectively, and specially the alternating current-direct current based on hierarchical control is mixed Close micro-capacitance sensor parallel inverter circulation inhibition method.
Background technology
Consider that the requirement of micro-capacitance sensor stability and capacity usually needs more bidirectional power transverter parallel runnings, needs at this time Equal flow problem when multi-parallel is analyzed, and different from the parallel running of multi-inverter, bidirectional power transverter need to use straight altogether The direct paralleling model of busbar is flowed, therefore access can be provided for zero sequence circulation, the circulation between parallel module can make grid-connected current It is distorted, increases loss, increase power device stress, reduce the reliability and efficiency of total system.
Circulation problem in existing Analysis of Study Methods micro-capacitance sensor when multi-inverter parallel proposes to increase phase to phase impedance Method inhibit zero sequence circulation and robust multiple feedback loop method etc., by introducing resistive virtual impedance link, make inverter Overall output impedance is in purely resistive, and the zero steady-state error output of inverter is realized using PR controllers, improves multi-inverter Between power distribution precision, reduce the voltage difference between inverter outlet side and grid entry point.But the method only for The circulation of medium-high frequency has preferable inhibition, poor for low frequency Circulation Components inhibition.
Invention content
The present invention is in order to solve alternating current-direct current mixing micro-capacitance sensor parallel inverter due to switching asynchronous, device parameters difference etc. Caused circulation problem provides the alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition method based on hierarchical control.
The present invention adopts the following technical scheme that realization：Alternating current-direct current mixing micro-capacitance sensor parallel inverter ring based on hierarchical control Suppressing method is flowed, transverter parallel connection main circuit includes the three bridge arm transverter of three-phase of parallel running, three bridge arm transverter of three-phase The filtered inductance of exchange side, dead resistance and filter capacitor incoming transport micro-capacitance sensor, DC side are micro- through DC capacitor access direct current Power grid further includes the AC current collecting for acquiring the AC voltage sampling module of exchange side voltage, acquiring ac-side current Module, the DC voltage acquisition module for acquiring DC bus-bar voltage, AC voltage sampling module output end are extracted with positive-sequence component Module, PLL phase-locked loop modules are connected with the input terminal of autonomous operation control module, the output end and seat of AC current collecting module The input terminal connection of conversion module is marked, the output end of DC voltage acquisition module and the input terminal of autonomous operation control module connect Connect, the output end of positive-sequence component extraction module is connect with the input terminal of Park conversion modules, the output end of PLL phase-locked loop modules with The input terminal of autonomous operation control module connects, the output end of autonomous operation control module, the output end of Park conversion modules and The output end of coordinate transform is connect with the input terminal of current inner loop decoupling control zero sequence loop current suppression module, current inner loop decoupling control The output end of zero sequence loop current suppression module processed is connect with the input terminal of anti-coordinate transformation module, the output end of anti-coordinate transformation module It is connect with the input terminal of PWM drive modules, the output end of PWM drive modules is connect with the feedback end of three bridge arm transverter of three-phase；
Circulation inhibition method includes the following steps：
AC voltage sampling module collects exchange side voltage UabcAnd it is input to positive-sequence component extraction module, PLL phase-locked loop modules With self-control operation control module, AC current collecting module collects ac-side current IabcAnd it is input to coordinate transformation module, directly Flow voltage acquisition module acquisition DC bus-bar voltage UdcAnd it is input to autonomous operation control module;
Coordinate transformation module exports electric current I under dq0 axis coordinate systems by the ac-side current inputted through coordinate transformdq0Into electric current Ring decoupling control zero sequence loop current suppression module;
PLL phase-locked loop modules are computed rear output frequency f to autonomous operation control module by the exchange side voltage inputted;
Autonomous operation control module is first by the exchange side A phase voltage Ua virtual values of acquisition and DC bus-bar voltage UdcVirtual value into It is made the difference after row normalization operation, obtains voltage deviation Δ U, active power reference value is acquired according to the calculating of active transmission droop characteristic Pref, collected PLL phase-locked loop modules output frequency value f is subjected to integration control, obtains phase angleδ i , according under idle transmission Characteristic of hanging down calculating acquires reactive power reference qref Qref；
Positive-sequence component extraction module uses quadravalence Generalized Integrator fundamental voltage extracting method, by collected exchange side voltage UabcThree-phase voltage is obtained through coordinate transformαβ0Component U αβ0 , the component be sent into quadravalence Generalized Integrator after obtain fundamental frequency voltages Signalαβ0Componentv’ αβ0 And corresponding quadrature componentqv’ αβ0 , fundamental frequency positive sequence electricity is can be obtained after operation and inverse transformation Flow component U αβ0 + ；
Park conversion modules are by the fundamental frequency forward-order current component U of input αβ0 + It is transformed to dq0 coordinate system positive sequence voltage components U dq0 +；
Current inner loop decoupling control zero sequence loop current suppression module collects active power reference value Pref, reactive power reference qref Qref And dq0 coordinate system positive sequence voltage components U dq0 +, current reference value I is acquired by calculatingdqref, introduce 0 axis reference current I0ref, two Person synthesizes reference current value Idq0ref.By reference current value Idq0refWith dq0 axis ACs side current value Idq0It makes the difference, by decoupling Modulated signal is acquired with loop current suppression controlU dq0ref, through anti-coordinate transformation module, that PWM drive modules are converted to pwm signal is defeated Go out and be input to three bridge arm unsteady flow bridge IGBT control terminals of three-phase, realizes the loop current suppression to transverter parallel connection.
Present invention has the advantages that：
1. what the present invention used is applied to the autonomous operation control of alternating current-direct current mixing micro-capacitance sensor bidirectional power converter, straight for handing over The different feature of stream busbar voltage property has respectively carried out it normalized according to subnet admissible voltage fluctuation range, real Power bi-directional smooth transfer between existing alternating current-direct current subnet.
2. the present invention replaces traditional two axis of dq control using the control of tri- axis of dq0, dynamic due to switching for parallel inverter Make circulation problem caused by asynchronous, device model difference etc., provides the circulation inhibition method extracted based on positive-sequence component, can have Effect inhibits the circulation between bi-directional inverter in parallel to generate.
Description of the drawings
Fig. 1 is transverter parallel connection main circuit topology.
Fig. 2 is parallel inverter loop current suppression system control block figure.
Specific embodiment
Transverter parallel connection main circuit includes three bridge arm transverter of three-phase, the filtered electricity of exchange side of three bridge arm transverter of three-phase Sense, dead resistance and filter capacitor incoming transport micro-capacitance sensor, DC side access direct-current grid through DC capacitor.Further include being used for The AC voltage sampling module of voltage is surveyed in acquisition exchange, the AC current collecting module of electric current is surveyed in acquisition exchange, acquisition direct current is female The DC voltage acquisition module of line voltage.AC voltage sampling module output end and positive-sequence component extraction module, PLL locking phase ring moulds Block is connected with the input terminal of autonomous operation control module, the input of the output end and coordinate transformation module of AC current collecting module End connection, the output end of DC voltage acquisition module are connect with the input terminal of autonomous operation control module, and positive-sequence component extracts mould The output end of block is connect with the input terminal of Park conversion modules, the output end of PLL phase-locked loop modules and autonomous operation control module Input terminal connection, output end, the output end of Park conversion modules and the output end of coordinate transform of autonomous operation control module It is connect with the input terminal of current inner loop decoupling control zero sequence loop current suppression module, current inner loop decoupling control zero sequence loop current suppression mould The output end of block is connect with the input terminal of anti-coordinate transformation module, output end and the PWM drive modules of anti-coordinate transformation module Input terminal connects, and the output end of PWM drive modules is connect with the feedback end of three bridge arm transverter of three-phase.
Above-mentioned control method, includes the following steps：
AC voltage sampling module collects exchange side voltage UabcAnd it is input to positive-sequence component extraction module, PLL phase-locked loop modules With self-control operation control module, AC current collecting module collects ac-side current IabcAnd it is input to coordinate transformation module, directly Stream voltage acquisition module acquisition DC bus-bar voltage is simultaneously input to autonomous operation control module;
Coordinate transformation module exports electric current I under dq0 axis coordinate systems by the ac-side current inputted through coordinate transformdq0Into electric current Ring decoupling control zero sequence loop current suppression module;
PLL phase-locked loop modules are computed rear output frequency f to autonomous operation control module by the exchange side voltage inputted;
Autonomous operation control module is first by the exchange side A phase voltage Ua virtual values of acquisition and DC voltage UdcVirtual value carries out It is made the difference after normalization operation, obtains voltage deviation Δ U, active power reference value is acquired according to the calculating of active transmission droop characteristic Pref, collected PLL phase-locked loop modules output frequency value f is subjected to integration control, obtains phase angleδ i , according under idle transmission Characteristic of hanging down calculating acquires reactive power reference qref Qref；
Positive-sequence component extraction module uses quadravalence Generalized Integrator fundamental voltage extracting method, by collected exchange side voltageU abcThree-phase voltage is obtained through coordinate transformαβ0Component U αβ0 , the component be sent into quadravalence Generalized Integrator after obtain fundamental frequency voltages Signalαβ0Componentv’ αβ0 And corresponding quadrature componentqv’ αβ0 , fundamental frequency positive sequence electricity is can be obtained after operation and inverse transformation Flow component U αβ0 + ；
Park conversion modules will input fundamental frequency forward-order current component U αβ0 + It is transformed to dq0 coordinate system positive sequence voltage components U dq0 +；
Current inner loop decoupling control zero sequence loop current suppression module collects active power reference value Pref, reactive power reference qref Qref And dq0 coordinate system positive sequence voltage components U dq0 +, current reference value I is acquired by calculatingdqref, introduce 0 axis reference current I0ref, two Person synthesizes reference current value Idq0ref.By reference current value Idq0refWith dq0 axis ACs side current value Idq0It makes the difference, by decoupling Modulated signal is acquired with loop current suppression controlU dq0ref, through anti-coordinate transformation module, that PWM drive modules are converted to pwm signal is defeated Go out and be input to three bridge arm unsteady flow bridge IGBT control terminals of three-phase, realizes the loop current suppression to transverter parallel connection.

Claims (1)

1. the alternating current-direct current mixing micro-capacitance sensor parallel inverter circulation inhibition method based on hierarchical control, it is characterised in that transverter is simultaneously Connection main circuit includes the three bridge arm transverter of three-phase of parallel running, and the filtered inductance of exchange side of three bridge arm transverter of three-phase is posted Raw resistance and filter capacitor incoming transport micro-capacitance sensor, DC side access direct-current grid through DC capacitor, further include for acquiring The AC voltage sampling module of exchange side voltage, the AC current collecting module for acquiring ac-side current, acquisition DC bus electricity The DC voltage acquisition module of pressure, AC voltage sampling module output end and positive-sequence component extraction module, PLL phase-locked loop modules and The input terminal of autonomous operation control module connects, and the output end of AC current collecting module and the input terminal of coordinate transformation module connect It connects, the output end of DC voltage acquisition module is connect with the input terminal of autonomous operation control module, positive-sequence component extraction module Output end is connect with the input terminal of Park conversion modules, and the output end of PLL phase-locked loop modules is defeated with autonomous operation control module Enter end connection, output end and the electricity of the output end of autonomous operation control module, the output end of Park conversion modules and coordinate transform The input terminal connection of inner ring decoupling control zero sequence loop current suppression module is flowed, current inner loop decoupling control zero sequence loop current suppression module Output end is connect with the input terminal of anti-coordinate transformation module, the input of the output end and PWM drive modules of anti-coordinate transformation module End connection, the output end of PWM drive modules are connect with the feedback end of three bridge arm transverter of three-phase；Circulation inhibition method specifically includes Following steps：
AC voltage sampling module collects exchange side voltage UabcAnd it is input to positive-sequence component extraction module, PLL phase-locked loop modules With self-control operation control module, AC current collecting module collects ac-side current IabcAnd it is input to coordinate transformation module, directly Stream voltage acquisition module acquisition DC bus-bar voltage is simultaneously input to autonomous operation control module;
Coordinate transformation module exports electric current I under dq0 axis coordinate systems by the ac-side current inputted through coordinate transformdq0Into electric current Ring decoupling control zero sequence loop current suppression module;
PLL phase-locked loop modules are computed rear output frequency f to autonomous operation control module by the exchange side voltage inputted;
Autonomous operation control module is first by the exchange side A phase voltage Ua virtual values of acquisition and DC voltage UdcVirtual value is returned It is made the difference after one change operation, obtains voltage deviation Δ U, active power reference value P is acquired according to the calculating of active transmission droop characteristicref, Collected PLL phase-locked loop modules output frequency value f is subjected to integration control, obtains phase angleδ i , according to the idle sagging spy of transmission Property calculate acquire reactive power reference qref Qref；
Positive-sequence component extraction module uses quadravalence Generalized Integrator fundamental voltage extracting method, by collected exchange side voltageU abcThree-phase voltage is obtained through coordinate transformαβ0Component U αβ0 , the component be sent into quadravalence Generalized Integrator after obtain fundamental frequency voltages Signalαβ0Componentv’ αβ0 And corresponding quadrature componentqv’ αβ0 , fundamental frequency positive sequence electricity is can be obtained after operation and inverse transformation Flow component U αβ0 + ；
Park conversion modules will input fundamental frequency forward-order current component U αβ0 + It is transformed to dq0 coordinate system positive sequence voltage components U dq0 +；
Current inner loop decoupling control zero sequence loop current suppression module collects active power reference value Pref, reactive power reference qref Qref And dq0 coordinate system positive sequence voltage components U dq0 +, current reference value I is acquired by calculatingdqref, introduce 0 axis reference current I0ref, two Person synthesizes reference current value Idq0ref, by reference current value Idq0refWith dq0 axis ACs side current value Idq0It makes the difference, by decoupling Modulated signal is acquired with loop current suppression controlU dq0ref, through anti-coordinate transformation module, that PWM drive modules are converted to pwm signal is defeated Go out and be input to three bridge arm unsteady flow bridge IGBT control terminals of three-phase, realizes the loop current suppression to transverter parallel connection.
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CN110175401A (en) * 2019-05-27 2019-08-27 河北交通职业技术学院 The decoupling normalization frequency locking ring modeling method of source
CN110601248A (en) * 2019-09-11 2019-12-20 华北电力大学（保定） Multi-mode coordination control method of annular alternating current-direct current hybrid micro-grid system
CN111404190A (en) * 2020-04-19 2020-07-10 中国电建集团华东勘测设计研究院有限公司 Control method and system for enhancing power output capability of MMC converter station under power grid fault
CN111865122A (en) * 2020-08-06 2020-10-30 北方工业大学 DC/AC converter common AC/DC bus parallel control method
CN112134270A (en) * 2020-09-16 2020-12-25 水发兴业能源(珠海)有限公司 Direct current power supply system and control method thereof
CN112366756A (en) * 2020-09-25 2021-02-12 河海大学 Current converter control system, current converter control method and microgrid
CN112751342A (en) * 2020-12-31 2021-05-04 华能大理风力发电有限公司洱源分公司 Reactive power and voltage layered zone control method, system and equipment in wind power plant
CN113346787A (en) * 2021-07-02 2021-09-03 太原理工大学 Pqz theory-based parallel bidirectional power converter circulating current restraining method
CN113644677A (en) * 2020-05-11 2021-11-12 中国能源建设集团江苏省电力设计院有限公司 Offshore wind power flexible-direct control method under receiving-end power grid fault

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Publication number Priority date Publication date Assignee Title
CN110175401A (en) * 2019-05-27 2019-08-27 河北交通职业技术学院 The decoupling normalization frequency locking ring modeling method of source
CN110601248A (en) * 2019-09-11 2019-12-20 华北电力大学（保定） Multi-mode coordination control method of annular alternating current-direct current hybrid micro-grid system
CN110601248B (en) * 2019-09-11 2023-01-10 华北电力大学（保定） Multi-mode coordination control method of annular alternating current-direct current hybrid micro-grid system
CN111404190B (en) * 2020-04-19 2021-09-03 中国电建集团华东勘测设计研究院有限公司 Control method and system for enhancing power output capability of MMC converter station under power grid fault
CN111404190A (en) * 2020-04-19 2020-07-10 中国电建集团华东勘测设计研究院有限公司 Control method and system for enhancing power output capability of MMC converter station under power grid fault
CN113644677B (en) * 2020-05-11 2024-04-16 中国能源建设集团江苏省电力设计院有限公司 Offshore wind power flexible direct control method under fault of receiving end power grid
CN113644677A (en) * 2020-05-11 2021-11-12 中国能源建设集团江苏省电力设计院有限公司 Offshore wind power flexible-direct control method under receiving-end power grid fault
CN111865122B (en) * 2020-08-06 2021-10-22 北方工业大学 DC/AC converter common AC/DC bus parallel control method
CN111865122A (en) * 2020-08-06 2020-10-30 北方工业大学 DC/AC converter common AC/DC bus parallel control method
CN112134270A (en) * 2020-09-16 2020-12-25 水发兴业能源(珠海)有限公司 Direct current power supply system and control method thereof
CN112366756A (en) * 2020-09-25 2021-02-12 河海大学 Current converter control system, current converter control method and microgrid
CN112751342A (en) * 2020-12-31 2021-05-04 华能大理风力发电有限公司洱源分公司 Reactive power and voltage layered zone control method, system and equipment in wind power plant
CN112751342B (en) * 2020-12-31 2023-08-15 华能大理风力发电有限公司洱源分公司 Reactive power and voltage layering and partitioning control method, system and equipment in wind farm
CN113346787A (en) * 2021-07-02 2021-09-03 太原理工大学 Pqz theory-based parallel bidirectional power converter circulating current restraining method

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