Demand response-based preventive-corrective control against short-term voltage instability in power systems

Short-term voltage stability increasingly concerns research community and poses significant threat to power system under current energy grid transformation. Preventive and corrective controls are two lines of defense against voltage collapse. As well, demand response as an effective smart grid mechanism is not fully applied in existing literature to accommodate demand-side disruption minimization during load shedding period. This paper proposes a demand-response based preventive-corrective load shedding control to counteract short- term voltage instability. An improved short-term voltage stability index is formulated to quantify system stability metrics. For demand response integration, a novel user-disruption index is developed to calculate the probabilistic corrective control cost which is coordinated with the preventive cost. Multi-objective evolution algorithm is utilized to compute Pareto Front solution to exploit the tradeoff balance between system economic cost and transient voltage stability level. The simulation results verify the effectiveness and superiority of proposed control scheme.