In order to verify whether the energy-consuming devices that use thyristors to quickly put highpower resistors into the AC system can operate safely and reliably after being put into operation

so as to solve the problem of line and equipment damage caused by overload in the bipolar wiring fault condition of Zhangbei flexible DC project

the circuit model of the AC energy dissipation device of Zhangbei Converter Station was established by PSCAD electromagnetic transient simulation software. Then the operating characteristics of the energy dissipation device are analyzed

and the voltage and current of the system when the excess wind energy and the energy dissipation device are switched into groups are simulated;finally

the influence of the energy dissipation device fault condition on the system is discussed.The results show that the energy-consuming device can quickly and efficiently dissipate the surplus power

and will not pose a threat to the system when it fails. It is concluded that the AC energy dissipation device has a reasonable design and can be put into operation in a flexible DC system.