变压器分列转并列运行冲击电流抑制措施研究  

Study on the Mode of Surge Current Suppression in Transformer Turned into Parallel Operation

作　　者：饶强[1] 王兢[1] 张艳妍[1] 常乾坤 徐梦佳[2] 王渝红[2] 魏亮[2] 汤华[2] 

机构地区：[1]国网北京市电力公司,北京100031 [2]四川大学电气信息学院,成都6100651

出　　处：《高压电器》2017年第7期130-135,共6页High Voltage Apparatus

基　　金：国网北京电力公司科技项目支持(52020114026Y)~~

摘　　要：变压器分列转并列现象很常见,其产生的冲击电流可能会破坏变压器、开关等设备,对于配电网的安全稳定运行十分不利,因此提出了一种基于复合开关的冲击电流抑制措施。首先利用戴维宁等值定理建立数学模型,分析了变压器暂态过程冲击电流形成的原因及计算方法,并推导论证了冲击电流、等值阻抗角及电压源相位三者之间的函数关系;然后设计了基于过零检测电路的复合开关分相投切控制模块,并在MATLAB中仿真实验,验证了该方法在对称及不对称系统中均可实现变压器稳态并列;最后,利用傅里叶算法(FFT)分析复合开关分相投切策略在谐波上的影响。结果表明,该投入方式对系统的谐波影响较小。It＇ s very common for transformers of independent operation to turn into parallel operation, and its surge current may destroy transformers, switches and the other equipment. So this paper presents a new method for surge current suppression based on the composite switch. Firstly, utilizing Thevenin equivalence theorem, the mathe- matical model is established. Meanwhile by analyzing the cause and the calculation method of the surge current in the transient process of the transformers, the impulse current function model with the equivalent impedance angle and the voltage source phase in switching time is derived. Then, the control module of the composite switch is de- signed based on zero crossing detection circuit. Finally, by MATLAB simulation, it is verified that the transformers can turn into parallel operation steadily under symmetric and asymmetric conditions with the proposed method; And the effect on the harmonic of the composite switch is analyzed by FFT method, whose results show that the in- put mode has little influence on the harmonic of the system.

关 键 词：并列运行 冲击电流 复合开关 阻抗角 分相控制 谐波 

分 类 号：TM41[电气工程—电器]