Research And Experiment Of The Control Steategy Of SVG To Load Compositive Characteristic

SVG based on voltage source converter is an important reactive compensator in Flexible AC Transmission System (FACTS). It has applied electric and electric technology, technology of the computer and modern control technology to the power system. The compensator can implement flexible and fast control to the network parameter and network structure of the power system and regulate continuously the reactive power in the whole range from capacitive reactive power to inductive reactive power, reach to avoid voltage collapse and enhance the ability of active power transportation at the same time of keeping the load characteristic.At first, the paper analyses the voltage collapse involved the load characteristic and reactive power from the point of simple physics track and puts forward the conception of reactive power on standby. Then the principle of SVG and the concept of reactive power are analyzed in detail. The different control ways involved the variables (δλ ) are investigated and compared, and the method in this paper is latter. Furthermore, the main circuit which including protect of the power taking electric electronic component IGBT as key device, the control circuit based on digital signal processor DSP and the control software with the key content SPWM have been designed. The co-control of control angle and modulation index is adopted.With the hardware circuit and control software analyzed and designed above, an experimental SVG device is has been developed. Various kinds of characteristic tests, which verify the feasibility of this SVG device, have been carried on, thus the experiment system realized the function of generating capacitive power or absorbing inductive power, then changed the magnitude of...