Risk-based voltage stability monitoring and preventive control using wide area monitoring system

Abstract

nowadays, power system tends to be operated in heavily stressed load, which can cause voltage stability problem. Moreover, occurrence probability of contingency is increasing due to growth of power system size and complexity. This paper proposes a new preventive control scheme based on voltage stability and security monitoring by means of wide area monitoring systems (WAMS). The proposed control scheme ensures voltage stability under major N-1 line contingencies, which are selected from all possible N-1 contingencies considering their occurrence probability and/or causing load curtailment. Some cases based on IEEE 57-bus test system are used to demonstrate the effectiveness of the proposed method. The demonstration results show that the proposed method can provide important contribution in improving voltage stability and security performance.

Optimal WAMS hybrid configuration for voltage stability monitoring application considering the existence of conventional measurement

“…Some line contingencies to be considered were selected based on the occurrence probability and the severity of voltage instability as presented in Ref. [16].…”

“…A preventive scheme strategy for securing voltage stability and security considering uncertainty scenario of RES output and line contingency, namely risk‐based optimum power flow (RBOPF), has been proposed in Refs . Consider that the uncertainty in which a scenario power system goes for the upcoming time interval is unknown.…”

“…The proposed optimal WAMS hybrid configuration is demonstrated under different cases in the IEEE 57‐bus test system; namely load fluctuations, preventive scheme strategy for voltage stability under uncertainties based on Refs and voltage instability cases in non‐contingency and contingency conditions. Simulation results show that the proposed WAMS hybrid can improve the estimation accuracy compared to the SCADA system.…”

A new sensitivity approach for preventive control selection in real-time voltage stability assessment

“…The ranks of control variables remain the same among the four control steps. For example, considering the line outage (3)(4)(5)(6)(7)(8), the output power by the generator G37 is the most effective control variable for all the control steps. In contrast, the output power by the generator G30 is the lowest effective control variable for all the control steps.…”

Optimizing the Preventive and Corrective Control Scheme in Integrated Variable Renewable Energy Generation

“…Extending the optimal power flow (OPF) into the Security Constrained Optimal Power Flow (SCOPF) problem becoming one of the common solutions for power system operation. Those solution are determining the generator's active power output while selecting some critical contingency [1] which the contingency selected based on, [2], [3], solving SCOPF with the voltage stability constraint for individual contingency scenario [4] and some contingency scenarios simultaneously [5], controlling reactive power of generator or synchronous condenser [6] and in the worst case performing load shedding (LS) in some critical contingencies [7]. However, the computation problem size remains as the major problem since the result of the SCOPF should be available within 15 -30 minutes.…”