The Study Of High Voltage SVG Controller&the IGBT Driving Power Supply

With the vigorous development of the power system,the type of grid electricity load is increasing.Some large inductive or capacitive loads,not only can cause fluctuations in the grid voltage,the impact of power quality,the reactive power system which is produced can also bring great loss of electricity sector.Therefore,how to improve the quality of power supply to ensure stable operation of the power system,is an important research background of this dissertation.Firstly,the principle of high voltage SVG is introduced,the impact of reactive power on the power system is analyzed,and its necessity and development prospects are also explained,the dissertation uses the same high-power IGBT to achieve control by the output voltage of the inverter unit size and the relative current phase,to achieve reactive power compensation.Due to the design used in lOkV system,so a single-phase chain circuit structure and modular design of the control strategy are used.Secondly,the design of hardware used in high voltage SVG control system is introduced,including the master controller,three-phase sub-controller,power module controllers,and some schematics are given in this dissertation.Finally,through the experimental method for functional testing of the entire device,the ideal output effect of reactive current is got.Finally,focus on the difficulty to obtain the electrical power,the power source which can work in wide range of input voltage is designed,using the power taken from the DC capacitor method of instability in the voltage range the following situations can have a very stable output.In this dissertation,single-ended flyback circuit switch is designed.DC500V-1200V voltage is input,DC 15V output voltage is stabilized.Circuit parameters are detailed selected to optimize the design of the transformer,reducing the ripple voltage spikes on the switch is effectively suppressed,the simulation and experiment results showed that,the design of the power supply voltage regulator with good performance,ripple voltage is small.