CN108448660B - Circulating current suppression method for parallel converter of hybrid micro-grid based on hierarchical control - Google Patents
Circulating current suppression method for parallel converter of hybrid micro-grid based on hierarchical control Download PDFInfo
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- CN108448660B CN108448660B CN201810237650.6A CN201810237650A CN108448660B CN 108448660 B CN108448660 B CN 108448660B CN 201810237650 A CN201810237650 A CN 201810237650A CN 108448660 B CN108448660 B CN 108448660B
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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
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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
- H02M7/66—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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Abstract
The invention relates to a circulating current restraining method for an AC/DC hybrid micro-grid parallel converter. The alternating current-direct current hybrid micro-grid consists of an alternating current sub-grid and a direct current sub-grid, and the two sub-grids are connected by a parallel bidirectional power converter. The control method can realize power interaction between the AC and DC sub-networks, carry out power support with each other and carry out smooth switching between grid connection and island modes. The control link mainly comprises two parts of autonomous operation control and circulation suppression control. And the autonomous control link respectively performs normalization processing on the alternating current bus voltage and the direct current bus voltage according to the allowable fluctuation range of the sub-network voltage aiming at the characteristic that the alternating current bus voltage and the direct current bus voltage have different properties, so that the bidirectional smooth transmission of power between the alternating current sub-network and the direct current sub-network is realized. In the loop current inhibition link, the traditional dq two-axis control is replaced by dq0 three-axis control, and a loop current inhibition method based on positive sequence component extraction is provided for solving the loop current problem of the parallel converter caused by asynchronous switching action, device model difference and the like, so that the loop current generation between the parallel bidirectional converters can be effectively inhibited.
Description
Technical Field
The invention relates to a method for restraining the circulation current of a parallel bidirectional power converter in an alternating current-direct current hybrid micro-grid, which can effectively control the circulation current problem when the bidirectional power converters are operated in parallel, in particular to a method for restraining the circulation current of a parallel converter of the alternating current-direct current hybrid micro-grid based on hierarchical control.
Background
Considering the requirements of stability and capacity of a microgrid, a plurality of bidirectional power converters are often required to operate in parallel, the current sharing problem during multi-parallel operation needs to be analyzed, and the requirements are different from the parallel operation of a plurality of inverters, the bidirectional power converters need to adopt a direct parallel mode of a common direct current bus, so that a path is provided for zero-sequence circulating current, the circulating current between parallel modules can distort grid-connected current, the loss is increased, the stress of a power device is increased, and the reliability and the efficiency of the whole system are reduced.
The existing research method analyzes the circulating current problem when multiple inverters are connected in parallel in a microgrid, provides a method for increasing interphase impedance to inhibit zero-sequence circulating current, a robust multi-loop control method and the like, enables the overall output impedance of the inverters to be pure resistive by introducing a resistive virtual impedance link, and adopts a PR (positive feedback) controller to realize zero steady-state error output of the inverters, so that the power distribution accuracy among the multiple inverters is improved, and the voltage difference between the outlet sides of the inverters and a grid-connected point is reduced. But the method only has better inhibition effect on medium-high frequency circular current and has poorer inhibition effect on low-frequency circular current components.
Disclosure of Invention
The invention provides a circulation restraining method of an AC/DC hybrid microgrid parallel converter based on hierarchical control, which aims to solve the circulation problem of the AC/DC hybrid microgrid parallel converter caused by unsynchronized switches, different device parameters and the like.
The invention is realized by adopting the following technical scheme: a circulation restraining method of an AC/DC hybrid micro-grid parallel converter based on hierarchical control comprises a three-phase three-leg converter which runs in parallel, wherein the AC side of the three-phase three-leg converter is connected with an AC micro-grid through a filter inductor, a parasitic resistor and a filter capacitor, the DC side is connected with a DC micro-grid through a DC capacitor, the circulation restraining method also comprises an AC voltage collecting module for collecting AC side voltage, an AC current collecting module for collecting AC side current and a DC voltage collecting module for collecting DC bus voltage, the output end of the AC voltage collecting module is connected with the input ends of a positive sequence component extracting module, a PLL phase-locked loop module and an autonomous running control module, the output end of the AC current collecting module is connected with the input end of a coordinate transformation module, the output end of the DC voltage collecting module is connected with the input end of the autonomous running control module, and the output end of the positive sequence component extracting module is connected with, the output end of the PLL module is connected with the input end of the autonomous operation control module, the output end of the Park transformation module and the output end of the coordinate transformation are connected with the input end of the current inner loop decoupling control zero sequence circulating current suppression module, the output end of the current inner loop decoupling control zero sequence circulating current suppression module is connected with the input end of the anti-coordinate transformation module, the output end of the anti-coordinate transformation module is connected with the input end of the PWM driving module, and the output end of the PWM driving module is connected with the feedback end of the three-phase three-bridge arm converter;
a method of circulating current suppression, comprising the steps of:
the alternating voltage acquisition module acquires the alternating side voltage UabcAnd inputting the current into a positive sequence component extraction module, a PLL phase-locked loop module and a self-control operation control module, and acquiring an alternating current I by an alternating current acquisition moduleabcAnd inputting the voltage to a coordinate transformation module, and acquiring a DC bus voltage U by a DC voltage acquisition moduledcAnd input to the autonomous operation control module;
the coordinate conversion module converts the input alternating current into the current I under the coordinate conversion output dq0 axial coordinate system through the coordinatedq0A zero-sequence circulating current restraining module for decoupling control to the current inner ring;
the PLL module outputs frequency f to the autonomous operation control module after calculating input alternating-current side voltage;
the autonomous operation control module firstly collects the effective value of the AC side A phase voltage Ua and the DC bus voltage UdcCarrying out normalization operation on the effective values and then carrying out difference to obtain a voltage deviation delta U, rootCalculating to obtain an active power reference value P according to the active transmission droop characteristicrefIntegrating the collected output frequency value f of the PLL module to obtain a phase angleδ i Calculating to obtain a reactive power reference value Q according to the reactive power transmission droop characteristicref；
The positive sequence component extraction module adopts a four-order generalized integrator fundamental voltage extraction method to collect AC side voltage UabcObtaining three-phase voltages by coordinate transformationαβ0Component U αβ0 The component is sent to a fourth-order generalized integrator to obtain a fundamental frequency voltage signalαβ0Component(s) ofv’ αβ0 And corresponding orthogonal componentsqv’ αβ0 The fundamental frequency positive sequence current component U can be obtained after operation and inverse transformation αβ0 + ；
The Park conversion module converts the input fundamental frequency positive sequence current component U αβ0 + Positive sequence voltage component U transformed into dq0 coordinate system dq0 +；
Active power reference value P acquired by current inner loop decoupling control zero sequence circulating current suppression modulerefReference value of reactive power QrefAnd dq0 coordinate system positive sequence voltage component U dq0 +Calculating to obtain a current reference value IdqrefIntroducing a 0-axis reference current I0refThe two are combined into a reference current value Idq0ref. Reference current value Idq0refCurrent value I on the AC side of dq0 axisdq0Making difference, and then obtaining modulation signal by decoupling and circulation current inhibition controlU dq0refAnd PWM signals are obtained through conversion of the inverse coordinate conversion module and the PWM driving module and output to the three-phase three-bridge arm converter bridge IGBT control end, so that the parallel circulating current suppression of the converter is realized.
The invention has the beneficial effects that:
1. the invention adopts autonomous operation control applied to the bidirectional power converter of the AC/DC hybrid microgrid, and respectively performs normalization processing on the AC/DC bus voltage according to the allowable fluctuation range of the sub-network voltage aiming at the characteristic of different AC/DC bus voltage properties, thereby realizing bidirectional and smooth transmission of power between the AC/DC sub-networks.
2. The invention adopts dq0 three-axis control to replace the traditional dq two-axis control, provides a circulating current restraining method based on positive sequence component extraction aiming at the circulating current problem of the parallel converter caused by asynchronous switching action, different device models and the like, and can effectively restrain the circulating current generation between the parallel bidirectional converters.
Drawings
Fig. 1 shows a converter parallel main circuit topology.
Fig. 2 is a control block diagram of a parallel converter circulating current suppression system.
Detailed description of the preferred embodiments
The converter parallel main circuit comprises a three-phase three-bridge arm converter, the alternating current side of the three-phase three-bridge arm converter is connected to an alternating current micro-grid through a filter inductor, a parasitic resistor and a filter capacitor, and the direct current side of the three-phase three-bridge arm converter is connected to a direct current micro-grid through a direct current capacitor. The device also comprises an alternating current voltage acquisition module for acquiring alternating current measurement voltage, an alternating current acquisition module for acquiring alternating current measurement current and a direct current voltage acquisition module for acquiring direct current bus voltage. The output end of the alternating current acquisition module is connected with the input ends of the positive sequence component extraction module, the PLL (phase locked loop) module and the autonomous operation control module, the output end of the alternating current acquisition module is connected with the input end of the coordinate conversion module, the output end of the direct current acquisition module is connected with the input end of the autonomous operation control module, the output end of the positive sequence component extraction module is connected with the input end of the Park conversion module, the output end of the PLL module is connected with the input end of the autonomous operation control module, the output end of the Park conversion module and the output end of the coordinate conversion module are connected with the input end of the current inner loop decoupling control zero sequence circulating current suppression module, the output end of the current inner loop decoupling control zero sequence circulating current suppression module is connected with the input end of the anti-coordinate conversion module, and the, and the output end of the PWM driving module is connected with the feedback end of the three-phase three-bridge arm converter.
The control method comprises the following steps:
alternating voltage acquisition moduleCollecting AC side voltage UabcAnd inputting the current into a positive sequence component extraction module, a PLL phase-locked loop module and a self-control operation control module, and acquiring an alternating current I by an alternating current acquisition moduleabcThe direct current bus voltage is acquired by the direct current voltage acquisition module and input to the autonomous operation control module;
the coordinate conversion module converts the input alternating current into the current I under the coordinate conversion output dq0 axial coordinate system through the coordinatedq0A zero-sequence circulating current restraining module for decoupling control to the current inner ring;
the PLL module outputs frequency f to the autonomous operation control module after calculating input alternating-current side voltage;
the autonomous operation control module firstly collects the effective value of the AC side A phase voltage Ua and the DC side voltage UdcCarrying out normalization operation on the effective value, then carrying out difference to obtain a voltage deviation delta U, and calculating to obtain an active power reference value P according to the active transmission droop characteristicrefIntegrating the collected output frequency value f of the PLL module to obtain a phase angleδ i Calculating to obtain a reactive power reference value Q according to the reactive power transmission droop characteristicref；
The positive sequence component extraction module adopts a four-order generalized integrator fundamental voltage extraction method to collect alternating-current side voltageU abcObtaining three-phase voltages by coordinate transformationαβ0Component U αβ0 The component is sent to a fourth-order generalized integrator to obtain a fundamental frequency voltage signalαβ0Component(s) ofv’ αβ0 And corresponding orthogonal componentsqv’ αβ0 The fundamental frequency positive sequence current component U can be obtained after operation and inverse transformation αβ0 + ；
The Park conversion module inputs a fundamental frequency positive sequence current component U αβ0 + Positive sequence voltage component U transformed into dq0 coordinate system dq0 +；
Active power reference value P acquired by current inner loop decoupling control zero sequence circulating current suppression modulerefReference value of reactive power QrefAnd dq0 coordinate system positive sequence voltageComponent U dq0 +Calculating to obtain a current reference value IdqrefIntroducing a 0-axis reference current I0refThe two are combined into a reference current value Idq0ref. Reference current value Idq0refCurrent value I on the AC side of dq0 axisdq0Making difference, and then obtaining modulation signal by decoupling and circulation current inhibition controlU dq0refAnd PWM signals are obtained through conversion of the inverse coordinate conversion module and the PWM driving module and output to the three-phase three-bridge arm converter bridge IGBT control end, so that the parallel circulating current suppression of the converter is realized.
Claims (1)
1. A circulation current restraining method of an AC/DC hybrid micro-grid parallel converter based on hierarchical control is characterized in that a converter parallel main circuit comprises a three-phase three-leg converter which runs in parallel, the AC side of the three-phase three-leg converter is connected with an AC micro-grid through a filter inductor, a parasitic resistor and a filter capacitor, the DC side is connected with a DC micro-grid through a DC capacitor, the circulation current restraining method also comprises an AC voltage collecting module for collecting AC side voltage, an AC current collecting module for collecting AC side current and a DC voltage collecting module for collecting DC bus voltage, the output end of the AC voltage collecting module is connected with the input ends of a positive sequence component extracting module, a PLL phase-locked loop module and an autonomous operation control module, the output end of the AC current collecting module is connected with the input end of a coordinate transformation module, the output end of the DC voltage collecting module is connected with the, the output end of the positive sequence component extraction module is connected with the input end of the Park transformation module, the output end of the PLL (phase locked loop) module is connected with the input end of the autonomous operation control module, the output end of the Park transformation module and the output end of coordinate transformation are connected with the input end of the current inner loop decoupling control zero sequence circulating current suppression module, the output end of the current inner loop decoupling control zero sequence circulating current suppression module is connected with the input end of the anti-coordinate transformation module, the output end of the anti-coordinate transformation module is connected with the input end of the PWM (pulse width modulation) driving module, and the output end of the PWM driving module is connected with the feedback end; the circulating current suppression method specifically comprises the following steps:
the alternating voltage acquisition module acquires the alternating side voltage UabcAnd inputting the current into a positive sequence component extraction module, a PLL phase-locked loop module and a self-control operation control module, and acquiring an alternating current I by an alternating current acquisition moduleabcThe direct current bus voltage is acquired by the direct current voltage acquisition module and input to the autonomous operation control module;
the coordinate conversion module converts the input alternating current into the current I under the coordinate conversion output dq0 axial coordinate system through the coordinatedq0A zero-sequence circulating current restraining module for decoupling control to the current inner ring;
the PLL module outputs frequency f to the autonomous operation control module after calculating input alternating-current side voltage;
the autonomous operation control module firstly collects the effective value of the AC side A phase voltage Ua and the DC side voltage UdcCarrying out normalization operation on the effective value, then carrying out difference to obtain a voltage deviation delta U, and calculating to obtain an active power reference value P according to the active transmission droop characteristicrefIntegrating the collected output frequency value f of the PLL module to obtain a phase angleδ i Calculating to obtain a reactive power reference value Q according to the reactive power transmission droop characteristicref；
The positive sequence component extraction module adopts a four-order generalized integrator fundamental voltage extraction method to collect alternating-current side voltageU abcObtaining three-phase voltages by coordinate transformationαβ0Component U αβ0 The component is sent to a fourth-order generalized integrator to obtain a fundamental frequency voltage signalαβ0Component(s) ofv’ αβ0 And corresponding orthogonal componentsqv’ αβ0 The fundamental frequency positive sequence current component U can be obtained after operation and inverse transformation αβ0 + ；
The Park conversion module inputs a fundamental frequency positive sequence current component U αβ0 + Positive sequence voltage component U transformed into dq0 coordinate system dq0 +；
Active power reference value P acquired by current inner loop decoupling control zero sequence circulating current suppression modulerefReference value of reactive power QrefAnd dq0 coordinate systemPositive sequence voltage component U dq0 +Calculating to obtain a current reference value IdqrefIntroducing a 0-axis reference current I0refThe two are combined into a reference current value Idq0refReference current value Idq0refCurrent value I on the AC side of dq0 axisdq0Making difference, and then obtaining modulation signal by decoupling and circulation current inhibition controlU dq0refAnd PWM signals are obtained through conversion of the inverse coordinate conversion module and the PWM driving module and output to the three-phase three-bridge arm converter bridge IGBT control end, so that the parallel circulating current suppression of the converter is realized.
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| CN110175401B (en) * | 2019-05-27 | 2022-12-13 | 河北交通职业技术学院 | Source-end decoupling normalized frequency-locked loop modeling method |
| 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 |
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| CN111865122B (en) * | 2020-08-06 | 2021-10-22 | 北方工业大学 | DC/AC converter common AC/DC bus parallel control method |
| CN112134270B (en) * | 2020-09-16 | 2022-05-06 | 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 |
| 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 |
| CN113346787B (en) * | 2021-07-02 | 2022-11-29 | 太原理工大学 | Parallel bidirectional power converter circulating current restraining method based on pqz theory |
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