基于FPGA的模块化多电平换流器并行化控制器设计及实验验证

Parallel controller design and experimental verification for modular multilevel converter based on FPGA

模块化多电平换流器(MMC)中数以千计的子模块(SM)给控制器计算带来很大负担。海量数据采集、复杂控制计算以及不同控制器间通信等因素导致整个控制链路延时较长,恶化系统动态特性,甚至导致并网后系统不稳定。设计了一种基于现场可编程门阵列(FPGA)的集成控制器,在单块FPGA板卡中实现MMC的全部控制策略。控制器充分发挥FPGA的并行特性,每种控制模块尽可能采用并行设计,并将相互独立的控制模块并行执行,以提高控制器的计算速度。基于RTDS平台进行了硬件在环实验,对所开发控制器进行功能验证。结果表明:所开发控制器链路延时短,响应速度快,可用于控制策略开发测试、控制参数调试等领域。

The thousands of sub-modules in MMC(Modular Multilevel Converter)bring a great calculation burden to the controller.Massive data acquisition,complex control calculation and communication between different controllers lead to long control link delay,which further deteriorates the dynamic characteristics of the system and even leads to instability of the system after grid connection.An integrated controller based on FPGA(Field Programmable Gate Array)is designed to implement all the control strategies of MMC in a single FPGA board.The controller makes full use of the parallel characteristics of FPGA.Each control block is designed in parallel as much as possible,and the independent control blocks are executed in parallel to improve the calculative speed of the controller.Based on the RTDS platform,hardware-in-the-loop experiments are carried out to verify the function of the developed controller.The results show that the controller has short link delay and fast response speed,which can be used in the development test of control strategies,control parameter debug and other fields.