An investigation of high-speed coordination control for multiple power converter systems

Recently, importance of the effective use of energy and demand for the introduction of renewable energy have risen more than before. Therefore, it is necessary to construct power network systems that consist of semiconductor power converters with various functions such as generation of the electric power, storing and discharge of the electric power. This paper describes high-speed coordination control methods for the multiple power converter systems. First, as a simplest example, a combined system of a PWM rectifier and a PWM inverter is investigated. Several coordination control methods are applied to minimize the required capacitance of the DC smoothing capacitor. The effectiveness of the coordination control methods are evaluated from the viewpoint of the over-voltage reduction and transient response of the DC link voltage. As a next step, to verify the effectiveness of the investigated coordination control methods in general multiple power converter systems, they are applied to a combined system that consists of 1 PWM rectifier and 2 PWM inverters. Furthermore, a general approach of the coordination control of multiple converter systems is discussed.