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从输电网功角失稳和配电网电压失稳的不同机理出发,对动态无功补偿装置在输、配电网络中不同配置进行了探索性的分析。对于输电网,根据系统失稳时临界割集处电压降低幅度大的特点,提出在输电网的临界割集或附近安装STATCOM装置,其原因在于STATCOM装置受端电压变化影响小,在功角失稳前电压降得很低时仍能提供较大感性无功功率;与STATCOM相比,虽然SVC与端电压的平方成正比,但对于配电网,由于电压失稳前电压不能降得太低,因此配电网中安装SVC装置较为经济可行。笔者对10机系统进行了动态无功补偿装置的配置。
Starting from the different mechanism of the power grid instability and the voltage instability of the distribution network, the different configurations of the dynamic reactive power compensation device in the transmission and distribution network are explored. For the transmission network, according to the characteristics of the voltage drop at the critical cut-off point when the system is unstable, the STATCOM device is proposed to be installed at or near the critical cut set of the transmission network. The reason is that the STATCOM device is less affected by the terminal voltage change, Compared with STATCOM, although the SVC is proportional to the square of the terminal voltage, the voltage before the steady-state voltage drop can still provide a large inductive reactive power. However, for the distribution network, the voltage before the voltage instability can not drop too low Therefore, it is more economical and feasible to install SVC in the distribution network. The author of the 10 machine system for dynamic reactive power compensation device configuration.