随着国家经济水平的不断提高，电网的用电负荷不断增加，同时由于某些电网网架结构薄弱，采用链式结构供电，导致电网中各重要断面功率接近极限运行。当电网发生故障情况下，将导致断面超极限以及地区电网电压稳定性和频率稳定性等问题，严重影响电网安全稳定运行。尤其是链式供电方式下受端电网发生机组跳闸，将导致电网中多个断面超极限运行，系统稳定性遭到破坏，稳控装置动作。稳控装置动作可以保证电网安全稳定运行，但是随着受端电网网架结构的不断建设，受端电网装机容量以及单台机组容量不断增加，造成稳控切负荷策略复杂甚至可能导致过切。通过对链式供电方式下，受端电网机组发生跳闸进行分析，找出了机组跳闸后的共性，结合这一共性提出了一种新的稳控切负荷方案。运用PSASP程序对某电网进行仿真分析，验证了该切负荷方案策略简单且不会导致过切，具有重要的实用价值。%With the constant improvement of the national economic level , the customers′load in power grid is increasing , and the chained structure of power supply is adopted due to the weak structure of power grid , which leads to the power at each im-portant cross-section in the grid closes to the limit .When there are faults occurring in power grid , it will lead to the cross-section go beyond the limit and result in the problems such as the voltage stability and frequency stability in regional power grid, which seriously affects the safe and stable operation of power grid .Especially under the chained power supply , the trip-ping of the units in receiving -end power grid will lead to multiple cross -sections in power grid go beyond the limit , thus the system stability is destroyed and the stability control devices are in action .Stability control devices can ensure the safe and sta-ble operation of power grid , but with the constant construction of framework structure of receiving -end power grid , the in-stalled capacity of receiving -end power grid as well as the single unit capacity is increasing , resulting in a complex load shed-ding strategy for stability control , even possible over -shedding .Through the analysis of unit tripping in receiving -end power grid under the chained power supply , the general character after the unit tripping is found out .And in combination with the general character , a new load shedding strategy for stability control is proposed .The simulation analysis with PSASP in one power grid verifies the proposed load shedding strategy is simple and does not lead to a over -shedding , which has an impor-tant practical value .
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