基于磁通补偿的串并联混合型电能质量控制器  

Series and Parallel Hybrid Power Quality Controller Based on Magnetic Flux Compensation

作　　者：陈先锋 王庭康 卓定明 李冠桥 黄秉开 龚杰[2] 李达义[2] CHEN Xianfeng;WANG Tingkang;ZHUO Dingming;LI Guanqiao;HUANG Bingkai;GONG Jie;LI Dayi(Huizhou Power Supply Bureau of Guangdong Power Co.,Ltd.,Huizhou,Guangdong 516000,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]广东电网有限责任公司惠州供电局,广东惠州516000 [2]强电磁工程与新技术国家重点实验室(华中科技大学),湖北武汉430074

出　　处：《广东电力》2021年第4期59-68,共10页Guangdong Electric Power

基　　金：中国南方电网有限责任公司科技项目(0313002019030103SJ0003)。

摘　　要：为减小电力系统中谐波和无功等问题所带来的危害,提出一种基于磁通补偿的电能质量控制器。通过对电压源型逆变器的控制,实现变压器磁通可控,从而进一步控制变压器阻抗。基于这种思想,串联变压器能够对基波分量呈现近似为0的阻抗,且当系统发生过流故障时,能够调节使得基波阻抗非常大以发挥故障限流器的作用;而对谐波分量呈励磁阻抗,起到隔离谐波的作用,且对基波电流不造成任何影响。另外,并联变压器对谐波分量呈近似为0的低阻抗,提供谐波电流通路;同时对基波分量呈连续无级可调,与无源滤波支路配合,实时补偿系统无功功率。基于串联、并联变压器2种控制模式,对系统电路建立数学模型,分析稳定性,理论分析该方案的有效性。最后,利用PSIM软件搭建仿真电路模型验证所提出的电能质量控制器。仿真结果表明该方案具有良好的谐波抑制、故障限流和无功补偿的性能。In order to reduce the harms caused by harmonic and reactive power problems in the power system,a power quality controller based on magnetic flux compensation is proposed in this paper,which can realize the control of transformer magnetic flux and impedance by controlling the voltage source inverters(VSI).Based on the above idea,the series transformer can present approximately zero impedance for fundamental component,and very large fundamental impedance so as to play the role of fault current limiter for overcurrent of the power system.For the harmonic component,it can present excitation impedance,functioning as isolating the harmonic while having no effect on fundamental current.The parallel transformer presents approximately zero impedance for the harmonic current component,providing the harmonic current path.It can continuously adjust the fundamental impedance and cooperate with the passive filter circuit to realize real-time compensation for system reactive power.Based on the two control modes of series and parallel transformers,the paper builds the mathematical model of the system circuit and analyzes the stability and the effectiveness of the scheme theoretically.Finally,by using PSIM software,it establishes the simulated circuit model The simulation results show that the scheme has good performance of harmonic suppression,overcurrent limitation and reactive power compensation.

关 键 词：电能质量 磁通补偿 变压器 逆变器 谐波抑制 故障电流限制 无功补偿 

分 类 号：TM46[电气工程—电器]