Development And Application Of The General Experimental Platform For New Energy Power Conversion

In the field of new energy power conversion,the traditional design method is to develop the corresponding control system software and hardware based on the specific application situation and resource requirements.It needs longer development cycle and costs higher if sepecific control platform is designed for each power converter control device.If the application situation or the control object changes,it needs to redesign the control platform,which wastes human and meterial resources.In this paper,based on the feedback signals,control pulses and other hardware resources demand of various typical new energy power conversion,the characteristics of common features are extracted and the experimental power conversion control platform is developed,which has good flexibility,selectivity and can be configured.The overall design method of control platform is that according to the whole circuit structure and function of the typical new energy power conversion control system,the hardware platform is divided to several module partitions,including the core control board,motherboard,function module boards and the human-machine interface(HMI).The core control board combines DSP-FPGA framework,with DSP as the main processor and FPGA as the coprocessor;The external power supply circuits and signal processing circuits are made into separate circuit boards and generally named "function module board",there are 11 function module boards according to different functions.In addition to the core control board and function module boards,the control system also includes a motherboard to achieve the signal interface between the two formers.The core control board,function module board,motherboard and HMI are all installed in a standard 4U case,which form the main body of the control system.The control platform software is mainly composed of three parts:DSP software,FPGA software and the HMI software.DSP is responsible for completing core control algorithm,serial communication protocol,PWM generation and so on due to its powerful data processing capability and fast instruction cycle;As the coprocessor,FPGA features strict timing,programmable and strong concurrent processing capabilities,it's mainly responsible for A/D sampling,capture processing,pulse processing,protection module,etc.HMI is mainly responsible for the communication with main processor DSP,the display of real-time data and waveform and changing operating parameters on-line,its software is designed in the MCGS environment.The control platform is applied to control the dual PWM converters of the laboratory 5.5kW doubly fed wind power generator system to verify its correctness as well as its flexible configuration of hardware and software.The primary and secondary circuits of the doubly fed wind power generation are built in the laboratory,and the static and dynamic experiments of the grid side converter and the no-load grid connection of the doubly fed wind power generator are carried out respectively.The experimental results show that control platform has high flexibility,strong control performance and good stability.