Research on Supporting Capacity of Concentrated Solar Power Plant Based on Reactive Power and Voltage Control

Abstract

Concentrated solar power technology is a renewable energy power generation technology that can achieve friendly grid connection and effective peak shaving at the same time. Based on the characteristics of the synchronous generator of the concentrated solar power unit, this paper first studies the reactive voltage control mode of the concentrated solar power plant, proposes the control technology of the generator terminal voltage and the high-voltage side bus voltage of the concentrated solar power plant, and analyzes the transient response characteristics of the generator terminal voltage of the concentrated solar power unit and its support capacity for the grid voltage under fault conditions. Through the excitation control system of synchronous generator, the generator terminal voltage of the power station can be controlled, and the bus voltage at the high voltage side of the power station can also be controlled, realizing the reactive voltage support for the power grid. On this basis, a power system example of wind power-photovoltaic-solar thermal combined power generation sent to the load center is designed to study the transient reactive power and voltage support capacity of solar thermal power stations. The research shows that the generator terminal voltage changes after the disturbance, but it can quickly adjust to the reference value under the condition of small disturbances such as voltage and load; Under the large disturbance of short circuit fault, the generator terminal voltage changes sharply, but it can finally stabilize and adjust to the reference value under the control of excitation system.