Design of Driving and Snubber Circuit of IGBT Used in Distribution Static Synchronous Compensator

In order to ensure that the power switching devices can reliably work,the driving circuit and snubber circuit of IGBT used in DSTATCOM is discussed and designed.The driving circuit consists of intelligent integrated driving model 2SD315A,which has the function of driving,insulation and protection.The 2SD315A has the merits of simple structure,multiple functions and easy to operation,suitable for DSTATCOM development.The design process of 2SD315A is introduced in detail.Due to the locking phenomena occur in the start operation of 2SD315A,the reset circuit is used to overcome the locking phenomena.The schematic diagram of reset circuit is presented.The snubber circuit consists of RCD type snubber circuit.The operation principle of the RCD sunbber circuit is analyzed.The optimization algorithm of design parameters of RCD type snubber circuit is established on the basis of the operation principle of the RCD sunbber circuit and the stability of IGBT.In the optimization algorithm mode the optimal object functions are overvoltage,discharge time and the cost of the RCD type snubber circuit.The parameters of snubber circuit are calculated by parallel self-correcting multi-function-objective genetic algorithm.An example design based on the optimization algorithm proposed is presented.The excellent performance and high reliability is verified by operation of the DSTATCOM.