Analysis of Electrothermal Characteristics of AC Filter Capacitor Components in Ultra Voltage Converter Station
Aiming at the serious heating problem caused by high-order harmonics on AC filter capacitor components of ultra high voltage converter stations under steady-state operation,to provide a basis for equipment status analysis and aging evalua-tion,finite element models of capacitor towers and thin film capacitors were established taking the BP11/13 dual tuned filter ca-pacitor tower as an example.Firstly,by using the electric thermal coupling method,the electric thermal characteristics of the ca-pacitor tower were calculated by providing harmonic current amplitude and frequency for the capacitor tower,and compared with the measurement data of the converter station to verify the accuracy of the finite element model.It was found that the weak part of the capacitor tower with severe heating was the middle layer capacitor.Afterwards,fine modeling was carried out on the thin film capacitor components,and the characteristics of copper loss and dielectric loss in thin film capacitors were studied.The sources of heat generation in thin film capacitors were analyzed to be metal electrodes and dielectrics.Finally,the vulnerable are-as of the capacitor components were figured out,and the parts that should be given special attention and protection were pro-posed.Suggestions to improve the safety and stability of equipment are also given.
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