一种面向微电网实时仿真的分块分层并行算法

微电网含有大量的高频功率开关和非线性元件,对电力系统实时仿真技术提出了很高的要求。为减轻逆矩阵法的存储压力,将整个网络分解成多个子网络,仅存储计算子网络状态变量和输出变量的各种参数。为降低子网络间约束方程的计算成本,利用其稀疏性的特点,提出了一种子网络分层合并的多端口等效方法。考虑FPGA硬件资源有限,设计了一种实现细粒度并行的专用运算组件。以2μs仿真步长在5SGSMD5芯片上实时仿真了一个低压微网系统,其仿真结果与商业离线仿真软件PSCAD结果一致,验证了所提方法的可行性和准确性。

A Block Hierarchical Parallel Method for Real-Time Simulation of Microgrid

The microgrid containing a large amount of high frequency power switches and nonlinear components has put forward high requirements for power system real-time simulation technology.In order to reduce the storage pressure of inverse matrices algorithm,the whole network is divided into multiple subnetworks and only the parameters for computing state variable and output variable of subnetworks are stored.Based on the sparse of the constraint equations between subnetworks,a multiport equivalent method of subnetwork hierarchical merge is proposed to reduce the computational cost.Under the condition of limited hardware resources of FPGA,a special processing unit realizing the fine-grained parallelism is designed.A low-voltage microgrid is simulated in real-time on a 5SGSMD5 chip with 2 μs time-step.By comparing the result with the simulation data of PSCAD platform,the feasibility and the accuracy of the proposed real-time simulation method are verified.