微电网分块并行实时仿真算法

Block Parallel Method for Real-time Simulation of Microgrid

微电网中含有大量的高频功率开关元件,对电力系统硬件在环实时仿真提出了很高的要求。为减轻逆矩阵法的存储压力,将整个微电网分割成多个子网络,仅存储计算子网络端口输入变量和内部状态变量等所需的各种参数。给出了选择端口输入变量及其列写网络方程的一般原则,研究了网络方程无向图的生成方法。采用状态变量作为子网络端口输入变量使迭代计算限制在网络局部。算例表明,所提网络分块求解的多端口混合等效方法能有效地解决数据存储和计算速度之间的矛盾,在基于FPGA的实时仿真器中能以5μs的仿真步长实现一个低压微网系统的实时仿真。

The microgrid containing a large amount of high frequency power switches puts forward high requirements for the real-time simulation of hardware-in-the-loop of power system. In order to reduce the storage pressure of inverse ma- trix algorithm, the whole network is divided into multiple subnetworks, and only the parameters for computing input and internal state variables of subnetworks are stored. A general principle to choose input variables and formulate net- work equation is proposed and the generation method for undirected graph of network equation is studied. In order to limit iterative calculation to the local network, the state variables are used as the input variables at sub-network port. A numerical example shows that the multiport-hybrid-equivalenee-based network tearing technique gives consideration to alleviating on-chip memory requirements and reducing the computational burden, and a low-voltage microgrid is simu- lated in a real-time simulator with 5 μs time-step based on FPGA.