基于DSP/FPGA的级联型固态变压器控制研究

级联型固态变压器是构建能源互联网的核心设备。然而单一控制器不能满足级联型固态变压器快速控制和各开关器件PWM脉冲信号数量的要求。对此根据级联型固态变压器的基本工作原理,采用了基于DSP与FPGA的协同控制器。该协同控制器通过高性能DSP实现控制算法的快速准确计算,并使用SPI通信总线发送PWM调制信号数据至FPGA。同时利用FPGA的并行机理,更好地实现了基于载波相移技术的PWM调制,而FPGA丰富的端口也满足PWM脉冲信号的数量要求。最后在380 V/2 k W两级级联H桥固态变压器样机上进行了实验。结果表明,所采用协同控制器,既可增加PWM脉冲信号数量,也能够自主适配级联级数,实现对整个系统的综合控制,具有较好的可行性和有效性。

Research of Cascaded Solid State Transformer Control Based on DSP/FPGA

Cascaded solid state transformer ( Cascaded SST ) is the core equipment on building energy internet .There is a problem that single processor cannot control faster or provide enough PWM signal ports for cascaded SST .This pa-per introduces a cooperative control processor based on DSP and FPGA , after analyzing the principle of cascaded SST . Within the cooperative control processor , main algorithms are performed by the DSP , and duty cycle data is sent through SPI bus .PWM modulation is performed by the FPGA based on carrier phase shift technology that achieves higher performances by the parallel architecture .At the same time , the GPIOs in the FPGA meet the number require-ments of PWM ports.The experiment is carried on a prototype of 380 V/2 kW two-level cascaded SST , and the exper-imental results demonstrate that just one cooperative control processor can increase the number of PWM ports and suit the cascade module automatically , and control whole cascaded SST system , which is feasible and effective .