Abstract
The frequency stability in the sending-end network with renewable energy generating units should be paid attention especially for an asynchronous interconnection system. When the DC blocking fault occurs in the system, the problem of high frequency in the sending-end network can be suppressed by using the frequency limit controller (FLC). This study introduces the structure and the parameters tuning method of the FLC, and the parameters optimisation method is proposed to avoid FLC acting repeatedly. In the study, a case is studied, and the results show that the FLC is important in the sending-end network. Finally, aiming at the coordination problem between multiple FLCs, a control strategy based on FLC influence coefficient is proposed in the study, and the strategy can suppress the over regulation effectively.
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