Control strategy for relieving transient potential energy accumulation in power system.

Effective control measures taken on the transient potential energy distribution in power transmission network can not only improve the stability of power system but also reduce the probability of cascading failures occurrence. By researching the distribution variation rules of voltage, phase‐angle difference, potential energy and its margin in the three‐machine system, the relationship is revealed further between transient potential energy distribution and network structure. The potential energy distribution mainly depends on the topology structure and parameter of the network, the potential energy is distributed most easily in the vulnerable links where equivalent reactance is bigger and voltage is lower. Three control measures are proposed to relieve the accumulation of transient potential energy. Changing network structure and parameter in vulnerable links can perfect the internal structure of power network from the root, and then improve the resisting disturbance capacity of the power system. Whereas decreasing the transmission power in the vulnerable links is an emergency control measure for improving the operation stability of power system on‐line. Simulation results on wepri‐36 system testify the validation of the proposed method. [ABSTRACT FROM AUTHOR]