CN204131128U - 一种三相四线制有源电力滤波器 - Google Patents

一种三相四线制有源电力滤波器 Download PDF

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CN204131128U
CN204131128U CN201420440420.7U CN201420440420U CN204131128U CN 204131128 U CN204131128 U CN 204131128U CN 201420440420 U CN201420440420 U CN 201420440420U CN 204131128 U CN204131128 U CN 204131128U
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phase
wire system
active power
brachium pontis
zero line
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叶彬城
孟超
陈文全
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Avic Tech Xiamen Electric Power Technology Co ltd
Avic Tech Xiamen Electronics Co ltd
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Xiamen Protek Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20Active power filtering [APF]

Abstract

本实用新型公开一种三相四线制有源电力滤波器,其特征在于:由三桥臂逆变电路构成,在各桥臂中点先依次串接接入电容及电阻并接至零线N后,在零线N中串接接入电感。本实用新型可以减小流过储能电容的零序电流,从而减少对电网电压的影响。

Description

一种三相四线制有源电力滤波器
技术领域
本实用新型涉及有源滤波器技术领域,尤其是指一种三相四线制有源电力滤波器。
背景技术
有源电力滤波器是一种用于动态抑制谐波、补偿无功的电力电子装置,它产生与负载电流中的谐波电流和无功电流大小相等,方向相反的补偿电流,对大小和频率变化的谐波电流及无功电流进行补偿。有源型电力滤波器的主电路结构主要分为三相三线制结构和三相四线制结构两种。
所述两种主电路结构的差异在于:三相四线制可以用于补偿三相负荷不平衡引起的中线电流,而三相三线制不能补偿中线电流。现有技术中,电容中点式三相四线制有源电力滤波器(APF)中,通常在电容上会流过很大的零序电流,尤其是要求具备3倍相线滤波能力时,容易对电网电压产生较大影响。
实用新型内容
本实用新型的目的在于提供一种三相四线制有源电力滤波器,以减小流过储能电容的零序电流,从而减少对电网电压的影响。
为达成上述目的,本实用新型的解决方案为:
一种三相四线制有源电力滤波器,由三桥臂逆变电路构成,在各桥臂中点先依次串接接入电容及电阻并接至零线N后,在零线N中串接接入电感。
进一步,所述三桥臂逆变电路包括LCL滤波电路及变流器,LCL滤波电路接变流器,变流器中储能电容由两电容串接而成,从两串接电容的中点连接至电感后,连接到零线N。
采用上述方案后,本实用新型在各桥臂中点先依次串接接入电容及电阻并接至零线N后,在零线N中串接接入电感,串入电感后,减小流过储能电容的零序电流,从而减少对电网电压的影响。
附图说明
图1为本实用新型的电路结构示意图。
标号说明
LCL滤波电路10          变流器20。
具体实施方式
以下结合附图及具体实施例对本实用新型做详细的说明。
参阅图1所示,本实用新型揭示的一种三相四线制有源电力滤波器,由三桥臂逆变电路构成,在各桥臂中点先依次串接接入电容C1、C2、C3及电阻R4、R5、R6并接至零线N后,在零线N中串接接入电感L7。
所述三桥臂逆变电路包括LCL滤波电路10及变流器20,LCL滤波电路10接变流器20,变流器20中储能电容由两电容C4、C5串接而成,从两串接电容C4、C5的中点连接至电感L7后,连接到零线N。
本实用新型在各桥臂中点先依次串接接入电容C1、C2、C3及电阻R4、R5、R6并接至零线N后,在零线N中串接接入电感L7,串入电感L7后,减小流过电容C4、C5的零序电流,从而减少对电网电压的影响。
本实用新型工作时,如图1所示,三相电接断路器K1后分别接接触器S1、接触器S2, 接触器S1与接触器S2;接触器S2分别与电阻R1、R2、R3连接构成缓冲软起电路,接触器S1接电感L1、L2、L3,与电感L4、L5、L6,及电容C1、C2、C3,及电阻R4、R5、R6构成LCL滤波电路后接变流器,变流器中储能电容由电容C4、C5串接形成,从电容C4、C5中点接到电感L7后接到零线N。断路器K1合上后,先控制接触器S2先吸合,对储能电容进行缓冲充电后,再控制接触器S1吸合,变流器通过电感L1、L2、L3,与L4、L5、L6,及电容C1、C2、C3,电阻R4、R5、R6构成LCL输出补偿电流。
以上所述仅为本实用新型的较佳实施例,并非对本案设计的限制,凡依本案的设计关键所做的等同变化,均落入本案的保护范围。

Claims (2)

1.一种三相四线制有源电力滤波器,其特征在于:由三桥臂逆变电路构成,在各桥臂中点先依次串接接入电容及电阻并接至零线N后,在零线N中串接接入电感。
2.如权利要求1所述的一种三相四线制有源电力滤波器,其特征在于:所述三桥臂逆变电路包括LCL滤波电路及变流器,LCL滤波电路接变流器,变流器中储能电容由两电容串接而成,从两串接电容的中点连接至电感后,连接到零线N。
CN201420440420.7U 2014-08-06 2014-08-06 一种三相四线制有源电力滤波器 Active CN204131128U (zh)

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Address after: Xinyang Industrial Zone Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361022

Patentee after: AVIC-TECH (XIAMEN) ELECTRIC POWER TECHNOLOGY CO.,LTD.

Address before: Xinyang Industrial Zone Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361022

Patentee before: AVIC-TECH (XIAMEN) ELECTRONICS Co.,Ltd.

Address after: Xinyang Industrial Zone Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361022

Patentee after: AVIC-TECH (XIAMEN) ELECTRONICS Co.,Ltd.

Address before: Xinyang Industrial Zone Xinle Road, Haicang District of Xiamen city of Fujian Province, No. 26 361022

Patentee before: XIAMEN PROTEK TECHNOLOGY Co.,Ltd.