Invention Grant
US08483885B2 System stabilizing device 有权
系统稳定装置

System stabilizing device
Abstract:
A self-contained control unit of a system stabilizing device installed on a microgrid is provided with a fluctuation detecting block 70A for determining a fluctuation component of the frequency of system voltage (Cωs) and a fluctuation component of voltage amplitude of the system voltage (C|Vs|). The fluctuation detecting block 70A determines the fluctuation component (Cωs) based on a deviation between the output signal of a low-pass filter 71 for noise removal and the output signal of a low-pass filter 72 for determining a fluctuation detection time. An interference action inhibiting unit 100 judges whether system stabilizing control and governor control of a generator interfere with each other, based on a frequency signal ωs and the fluctuation component Cωs. If there is interference, the time constant of the low-pass filter 72 is reduced to reduce the fluctuation component Cωs, thereby decreasing the amount of control by the system stabilizing device and preventing interference. By this measure, system stabilizing control is exercised, without interfering with the governor control or AVR control of the generator.
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