摘要
在对光伏发电系统进行低电压穿越实验时,真空断路器投切短路电抗器会产生较高的瞬态过电压,引起电抗器外绝缘击穿,造成实验设备损坏。为了研究抑制实验过程中过电压的有效措施,文中首先结合光伏发电低电压穿越实验系统,对影响瞬态过电压的因素进行了理论分析,并根据某35 kV低电压穿越实验线路,利用ATP进行了仿真计算,得出:影响瞬态过电压的因素有真空断路器截流值、投入短路电抗的大小和测试点并联电容的大小。最后总结出测试点并联0.1μF的电容和100Ω的电阻可有效减小瞬态过电压的峰值。
When the low voltage ride-through （LVRT） experiments are performed in photo-voltaic （PV） system, transient overvoltage is occurred by vacuum circuit breakers switching off shunt reactors and its amplitude is high. It would cause external insulation breakdown of reactor and equipment damage. Base on circuit theory, this paper focuses on the factors which impact on the transient overvoltage in the 35 kV PV-LVRT experimental system. And then according to 35 kV LVRT experimental line, a simulation model of experimental system is established in ATP/ EMTP. The simulation results indicated that the closure value of vacuum circuit breaker, the size of invested short- circuit reactance and the size of shunt capacitor were major influencing factors on the transient overvoltage cased by vacuum circuit breaker operation. A shunt capacitor with 0.1μF and a shunt resistor with 100 Ω connected to the test point could effectively reduce the peak value of transient overvoltage.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第10期19-23,共5页
High Voltage Apparatus
关键词
低电压穿越
瞬态过电压
真空断路器
并联电容器
low voltage ride-through （LVRT）
transient over-voltage
vacuum circuit breaker
shunt capacitor
