WTGs in constant voltage control
When the coefficient of the proportion and integration links in the PI control on DC side of the controllable HV reactor varies, it will exert some influence over the system stability in the conditions that the Hexi transmission channel is provided with series compensation capacitors and controllable HV reactors, and the Jiuquan-Hexi 750 kV double-circuit transmission line can transmit about 4900 MW power. See Table 4.23.

Table 4.23

Impact of Variation of Proportion and Integration Links Coefficient in the PI Control of the Controllable HV Reactor DC Side on System Stability

Operating ModeProportional CoefficientIntegral CoefficientLimitation FaultStability
Summer maximum mode, with serial compensating capacitor ...

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