A Stochastic Economic Dispatch Method Considering a Voltage-Sensitive Load as a Reserve

Abstract

The volatility and uncertainty of renewable energy seriously affect the stability of power systems. To overcome this challenge and improve the ability of power systems to deal with disturbances, an optimized dispatch method for a high-permeability renewable energy-integrated power system with a voltage-sensitive load (VSL) as the reserve is proposed. To fully utilize the flexibility of the VSL and the reactive power control capability of the transmission grid, this paper first establishes a voltage control model based on coordinated sensitivity-based transmission and distribution and quantifies the active power adjustment boundary considering voltage stability. Then, based on the corresponding risk, a stochastic reserve decision model of a power system considering the regulation capacity of a VSL is established. A case study of a modified IEEE RTS-79 system shows that the method can fully consider the influence of the voltage at the access point on the load power, change the power of the VSL, and provide an active power reserve for the power system. This approach can reduce the risk of wind curtailment and load shedding in the system and improve the economy and flexibility of system operation.