CN108448660B - Circulating current suppression method of parallel converters in hybrid microgrid based on hierarchical control - Google Patents

Circulating current suppression method of parallel converters in hybrid microgrid based on hierarchical control Download PDF

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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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circulating current
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CN108448660A (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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Abstract

本发明涉及一种交直流混合微电网并联换流器环流抑制方法。交直流混合微电网由交流子网和直流子网组成，且两个子网由并联双向功率换流器连接。所提控制方法可实现交直流子网间的功率交互，彼此进行功率支撑，可进行并网与孤岛模式的平滑切换。控制环节主要包括自治运行控制与环流抑制控制两部分。自治控制环节针对交直流母线电压性质不同的特点，根据子网电压允许波动范围，分别对其进行了归一化处理，实现交直流子网间功率双向平滑传输。环流抑制环节采用dq0三轴控制取代传统的dq两轴控制，针对并联换流器由于开关动作不同步、器件型号差异等引起的环流问题，给出基于正序分量提取的环流抑制方法，可有效抑制并联双向换流器间的环流产生。

Figure 201810237650

The invention relates to a circulating current suppression method of a parallel converter of an AC-DC hybrid microgrid. The AC-DC hybrid microgrid consists of an AC sub-network and a DC sub-network, and the two sub-networks are connected by parallel bidirectional power converters. The proposed control method can realize power interaction between AC and DC sub-networks, support each other with power, and can perform smooth switching between grid-connected and islanded modes. The control link mainly includes two parts: autonomous operation control and circulating current suppression control. In the autonomous control link, according to the different characteristics of the AC and DC bus voltages, according to the allowable fluctuation range of the sub-network voltage, they are respectively normalized to realize the two-way smooth transmission of power between the AC and DC sub-networks. In the circulation suppression link, dq0 three-axis control is used to replace the traditional dq two-axis control. Aiming at the circulation problems caused by the asynchronous switching action of parallel converters and the difference of device models, a circulation suppression method based on positive sequence component extraction is given, which can effectively Suppress the generation of circulating current between parallel bidirectional converters.

Figure 201810237650

Description

Circulating current suppression method for parallel converter of hybrid micro-grid based on hierarchical control
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.基于分层控制的交直流混合微电网并联换流器环流抑制方法，其特征在于换流器并联主电路包括并联运行的三相三桥臂换流器，三相三桥臂换流器的交流侧经滤波电感、寄生电阻及滤波电容接入交流微电网，直流侧经直流电容接入直流微电网，还包括用于采集交流侧电压的交流电压采集模块、采集交流侧电流的交流电流采集模块、采集直流母线电压的直流电压采集模块，交流电压采集模块输出端与正序分量提取模块、PLL锁相环模块和自治运行控制模块的输入端连接，交流电流采集模块的输出端与坐标变换模块的输入端连接，直流电压采集模块的输出端与自治运行控制模块的输入端连接，正序分量提取模块的输出端与Park变换模块的输入端连接，PLL锁相环模块的输出端与自治运行控制模块的输入端连接，自治运行控制模块的输出端、Park变换模块的输出端和坐标变换的输出端与电流内环解耦控制零序环流抑制模块的输入端连接，电流内环解耦控制零序环流抑制模块的输出端与反坐标变换模块的输入端连接，反坐标变换模块的输出端与PWM驱动模块的输入端连接，PWM驱动模块的输出端与三相三桥臂换流器的反馈端连接；环流抑制方法具体包括以下步骤：1. based on the AC-DC hybrid microgrid parallel converter circulating current suppression method of hierarchical control, it is characterized in that the parallel main circuit of the converter comprises three-phase three-leg converters operating in parallel, and the three-phase three-leg converters The AC side of the device is connected to the AC microgrid through the filter inductor, parasitic resistance and filter capacitor, and the DC side is connected to the DC microgrid through the DC capacitor. The acquisition module, the DC voltage acquisition module for collecting the DC bus voltage, the output terminal of the AC voltage acquisition module is connected to the input terminal of the positive sequence component extraction module, the PLL phase-locked loop module and the autonomous operation control module, and the output terminal of the AC current acquisition module is connected with the coordinates The input end of the transformation module is connected, the output end of the DC voltage 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 transformation module, and the output end of the PLL phase-locked loop module is connected with The input end of the autonomous operation control module is connected, the output 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, and the current inner loop solution The output end of the coupling control zero-sequence circulating current suppression module is connected with the input end of the inverse coordinate transformation module, the output end of the inverse coordinate transformation module is connected with the input end of the PWM drive module, and the output end of the PWM drive module is connected with the three-phase three-bridge arm commutation The feedback end of the controller is connected; the circulating current suppression method specifically includes the following steps: 交流电压采集模块采集到交流侧电压Uabc并输入到正序分量提取模块、PLL锁相环模块和自制运行控制模块，交流电流采集模块采集到交流侧电流Iabc并输入到坐标变换模块，直流电压采集模块采集直流母线电压并输入到自治运行控制模块;The AC voltage acquisition module collects the AC side voltage U abc and inputs it to the positive sequence component extraction module, the PLL phase-locked loop module and the self-made operation control module, the AC current acquisition module collects the AC side current I abc and inputs it to the coordinate transformation module, DC The voltage acquisition module collects the DC bus voltage and inputs it to the autonomous operation control module; 坐标变换模块由输入的交流侧电流经坐标变换输出dq0轴坐标系下电流Idq0到电流内环解耦控制零序环流抑制模块;The coordinate transformation module controls the zero-sequence circulating current suppression module by decoupling the input AC side current through coordinate transformation and outputting the current I dq0 in the dq0 axis coordinate system to the current inner loop; PLL锁相环模块由输入的交流侧电压经计算后输出频率f至自治运行控制模块;The PLL phase-locked loop module outputs the frequency f to the autonomous operation control module after calculating the input AC side voltage; 自治运行控制模块先将采集的交流侧A相电压Ua有效值与直流侧电压Udc有效值进行归一化运算后做差，得到电压偏差ΔU，根据有功传输下垂特性计算求得有功功率参考值Pref，将采集到的PLL锁相环模块输出频率值f进行积分控制，得到相角δ i ，根据无功传输下垂特性计算求得无功功率参考值Qref；The autonomous operation control module first normalizes the rms value of the collected AC side A-phase voltage Ua and the rms value of the DC side voltage U dc , and then makes the difference to obtain the voltage deviation ΔU, and calculates the active power reference value according to the droop characteristic of active power transmission. P ref , perform integral control on the collected output frequency value f of the PLL phase-locked loop module to obtain the phase angle δ i , and calculate and obtain the reactive power reference value Q ref according to the droop characteristic of reactive power transmission; 正序分量提取模块采用四阶广义积分器基波电压提取方法，将采集到的交流侧电压U abc经坐标变换得到三相电压的αβ0分量U αβ0 ，该分量送入四阶广义积分器后得到基频电压信号的αβ0分量v’ αβ0 以及对应的正交分量qv’ αβ0 ，经过运算和反变换后即可得到基频正序电流分量U αβ0 + ；The positive-sequence component extraction module adopts the fourth-order generalized integrator fundamental wave voltage extraction method to transform the collected AC side voltage U abc to obtain the αβ0 component U αβ0 of the three-phase voltage, which is sent to the fourth-order generalized integrator to obtain The αβ0 component v' αβ0 of the fundamental frequency voltage signal and the corresponding quadrature component qv' αβ0 can be obtained after operation and inverse transformation to obtain the fundamental frequency positive sequence current component U αβ0 + ; Park变换模块将输入基频正序电流分量U αβ0 + 变换为dq0坐标系正序电压分量U dq0 +；The Park transform module transforms the input fundamental frequency positive sequence current component U αβ0 + into the dq0 coordinate system positive sequence voltage component U dq0 + ; 电流内环解耦控制零序环流抑制模块采集到有功功率参考值Pref、无功功率参考值Qref及dq0坐标系正序电压分量U dq0 +，经过计算求得电流参考值Idqref，引入0轴参考电流I0ref，两者合成为参考电流值Idq0ref，将参考电流值Idq0ref与dq0轴交流侧电流值Idq0做差，后经解耦与环流抑制控制求得调制信号U dq0ref，经反坐标变换模块、PWM驱动模块转换得到PWM信号输出并输入到三相三桥臂变流桥IGBT控制端，实现对换流器并联的环流抑制。The current inner loop decoupling control zero-sequence circulating current suppression module collects the active power reference value P ref , the reactive power reference value Q ref and the positive sequence voltage component U dq0 + of the dq0 coordinate system, and obtains the current reference value I dqref through calculation, and introduces it into The 0-axis reference current I 0ref is synthesized into a reference current value I dq0ref , the reference current value I dq0ref and the dq0-axis AC side current value I dq0 are made difference, and then the modulation signal U dq0ref is obtained through decoupling and circulating current suppression control, The PWM signal output is converted by the inverse coordinate transformation module and the PWM drive module and input to the IGBT control terminal of the three-phase three-arm converter bridge to realize the circulating current suppression of the inverters in parallel.
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