Coordinated Voltage and Reactive Power Control of Power System with Wind Farms and SVCs as the ORPD problem

Voltage and reactive power control is becoming an increasingly urgent task as the complexity of electric power systems (EPS) increases, power transmission increases, and various types of generation are connected to high voltage levels, including Renewable Energy Sources (RES). Thus, it's highly important to coordinate control actions of different types of devices, such as wind turbines (WTs) as a part of Wind Farms (WFs), and different FACTS (Flexible Alternating Current Transmission System) devices/reactive power compensators, such as Static Var Compensators (SVCs), in order to ensure economic and reliable operation of EPS. This paper presents the effect of automatic coordinated voltage and reactive power control of an EPS containing WFs and SVCs with representation of optimization problem in the form of Optimal Reactive Power Dispatch (ORPD). The calculations were carried out on modified test schemes IEEE 9 bus and IEEE 57 bus. The influence of increased length of power lines (PLs) on the optimization effect is considered. It's shown that the greater the length as well as the share of long-distance (extra) high voltage PLs among all the PLs of the EPS, the greater the effect of coordinated voltage and reactive power control.