CN106887967A - 一种多逆变器并联的均流控制方法 - Google Patents

一种多逆变器并联的均流控制方法 Download PDF

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CN106887967A
CN106887967A CN201510913173.7A CN201510913173A CN106887967A CN 106887967 A CN106887967 A CN 106887967A CN 201510913173 A CN201510913173 A CN 201510913173A CN 106887967 A CN106887967 A CN 106887967A
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inverter
sharing control
current
parallel
control method
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范洪国
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—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
    • H02M7/53871—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 with automatic control of output voltage or current
    • H02M7/53873—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 with automatic control of output voltage or current with digital control
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation

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

Abstract

本发明公开了一种多逆变器并联的均流控制方法，包括多逆变器并联电路、延时脉宽补偿、SPWM调制和均流控制四个部分。解决了并联系统存在的环流问题，并通过脉冲延时补偿解决了逆变器输出电流的不均流问题。脉冲调制方式为闭环补偿法的优点是能够实现自动补偿，可以适应不同并联数量的多逆变器并联系统，因此通过将脉冲调制方式改为SPWM调制方式，有效地抑制了并联系统中存在的环流问题。

Description

一种多逆变器并联的均流控制方法
技术领域
本发明涉及一种电源逆变装置，尤其涉及以中国多逆变器并联的均流控制方法。
背景技术
近年来，随着电力电子技术的迅速发展，逆变器越来越朝着大容量的方向发展。特别是在新能源应用领域，例如风力发电，光伏发电和蓄能电站等，其中逆变器的容量可以高达数MW。然而受制于功率开关器件通流能力，在大功率应用场合特别是在低压大电流领域，单逆变器技术方案难以满足功率输出的要求，只能采用多个逆变器并联的技术方案以提高逆变器的输出功率。
并联技术的采用使得在大容量应用场合采用低功率等级的开关器件成为可能，降低了生产成本；同时，采用并联技术便于进行模块化设计以缩短生产周期，并拓宽了功率模块的使用范围。一般采用的单套逆变器系统为三相三线制结构，所以没有零序环流通道，故不存在环流问题，但在多逆变器并联的系统中，存在环流通道，如果不加以抑制，就会引起严重的环流问题。由于环流只在并联的逆变器之间流动，并不体现在并联逆变器的输出总电流中，因此环流的存在一定程度上降低了系统的有效容量，同时增加了电路的损耗，降低了系统的效率。
直流环流的存在，各模块的热应力和电应力仍不均衡，降低了并联系统的可靠性。环流还会引起不均流问题，从而使功率开关器件承受的电流应力不均衡，影响其使用寿命，并限制了系统容量的增加。因此，环流抑制和均流控制是多并联逆变器控制必须要解决的关键问题。
发明内容
为了克服环流抑制和均流控制的问题，本发明提出一种多逆变器并联的均流控制方法。
本发明解决其技术问题所采用的技术方案是：
通过分析环流和不均流的形成机理，证明了环流产生的根本原因是由于各并联逆变器输出电压不一致造成的，因此，抑制并联逆变器环流的最有效办法就是通过调节各个并联逆变器的输出电压使之基本相等从而抑制环流。
多逆变器并联的均流控制方法包括：多逆变器并联电路、延时脉宽补偿、SPWM调制和均流控制四个部分。
所述多逆变器并联电路是由多个三相逆变器并联组成的，每个逆变器包含六个IGBT开关管组成的桥式电路。
所述延时脉宽补偿即采用闭环PI 调节的方法，通过监测不均流度，自动进行脉冲宽度的调整，直到不均流度接近为零。
所述SPWM调制将延时脉宽补偿得到的电压信号作为给定，进行脉宽调制。
所述均流控制将SPWM模块得到逆变器的占空比信息，再结合不均流计算模块输出的各并联逆变器的不均流信息，执行均流控制，得到各并联逆变器的占空比信息。
本发明的有益效果是：解决了并联系统存在的环流问题，并通过脉冲延时补偿解决了逆变器输出电流的不均流问题。此外通过将脉冲调制方式改为SPWM调制方式，从而有效地抑制了并联系统中存在的环流问题。
附图说明
图1 多逆变器并联电路图。
图2 逆变器的单相输出电路。
图3 逆变器并联系统控制框图。
具体实施方案
系统由N 个结构完全相同的三相IGBT全控桥（BH-1,..., BH-N）组成，所有N 个三相全控桥的直流端均连接在一起，三相全控桥的输出端通过均流电抗器L1,..., LN相连于一起接在异步电机的三相输入定子端。多逆变器并联的控制目标是控制逆变器输出的总电流平衡、抑制各子逆变器之间的环流和抑制各子逆变器输出电流的不均流现象。
图2中，为第n 个并联逆变器的k 相桥臂的输出等效示意图，图中 为上管IGBT 的导通压降；为下管IGBT 的导通压降，设置母线电容的虚拟中点作为逆变器输出电压的参考零电位。为逆变器直流母线电压；为第n 个逆变器的k相桥臂的开关函数，当第n 个逆变器的k相桥臂上管导通时，=1；下管导通时，=0。
延时脉宽补偿采用闭环补偿的方式。即采用闭环PI 调节的方法，通过监测不均流度，自动进行脉冲宽度的调整，直到不均流度接近为零。图3中，首先进行角频率采样后，进行相应的计算，即可得到交轴电流和直轴电流的给定值，再结合采样得到的直轴电流和交轴电流，分别对直轴电流偏差和交轴电流偏差进行PI控制，得到直轴电压和交轴电压的给定量，再经过变换，即可得到经过延时脉宽补偿的SPWM调制给定量。
最后将三相开关信号作为均流控制的输入，进行均流计算，得到并联的各逆变器SPWM调制信号，控制每个IGBT的通断。

Claims (5)

1.一种多逆变器并联的均流控制方法，其特征在于：多逆变器并联电路、延时脉宽补偿、SPWM调制和均流控制四个部分。
2.如权利要求1所述的多逆变器并联的均流控制方法，其特征在于所述多个三相逆变器并联组成的，每个逆变器包含六个IGBT开关管组成的桥式电路。
3.如权利要求1所述的多逆变器并联的均流控制方法，其特征在于所述延时脉宽补偿，采用闭环PI 调节的方法，能够自动进行脉冲宽度的调整。
4.如权利要求1所述的多逆变器并联的均流控制方法，其特征在于所述SPWM的给定将通过延时脉宽补偿，进行实时调整。
5.如权利要求1所述的多逆变器并联的均流控制方法，其特征在于所述均流控制将SPWM模块得到逆变器的占空比信息，结合不均流计算，最终得到各并联逆变器的占空比信息。
CN201510913173.7A 2015-12-11 2015-12-11 一种多逆变器并联的均流控制方法 Pending CN106887967A (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109510498A (zh) * 2017-09-14 2019-03-22 株式会社日立制作所 电力变换装置以及电力变换装置的调整方法
CN110048584A (zh) * 2018-01-12 2019-07-23 Abb瑞士股份有限公司 确定及补偿功率晶体管延迟
CN111969665A (zh) * 2020-08-26 2020-11-20 华北电力大学（保定） 一种多台并列运行功率变换器的环流抑制方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109510498A (zh) * 2017-09-14 2019-03-22 株式会社日立制作所 电力变换装置以及电力变换装置的调整方法
CN109510498B (zh) * 2017-09-14 2021-02-02 株式会社日立制作所 电力变换装置以及电力变换装置的调整方法
CN110048584A (zh) * 2018-01-12 2019-07-23 Abb瑞士股份有限公司 确定及补偿功率晶体管延迟
CN110048584B (zh) * 2018-01-12 2021-04-13 Abb瑞士股份有限公司 确定及补偿功率晶体管延迟
US10985751B2 (en) 2018-01-12 2021-04-20 Abb Schweiz Ag Determining and compensating power transistor delay in parallel half bridge legs
CN111969665A (zh) * 2020-08-26 2020-11-20 华北电力大学（保定） 一种多台并列运行功率变换器的环流抑制方法

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