基于HYPERSIM的大规模电网电磁暂态实时仿真实现技术

我国交直流大电网的持续发展对电力系统仿真提出了更高要求。接入实际直流控保装置的大规模电磁暂态实时仿真能够较准确的理解复杂电网的行为以及研究交直流相互影响特性。要实现?s级计算步长下,电磁暂态仿真规模达数千节点的交直流大电网模型实时运转,对解耦的合理性和仿真的实时性提出了严苛的要求,既是实现接入多套直流控保装置的前提条件,也是国际电力系统实时仿真领域共同面临的巨大挑战。基于HYPERSIM和超级计算机SGI,结合处理器计算能力,在长线路自然解耦的基础上,通过优化大电网解耦方法,合理拆分子任务模块,同时满足仿真精度和实时性要求。深入研究了HYPERSIM的自动任务映射参数,提出了综合优化自动任务映射参数的方法。最终实现了规模达到17746个单相节点的大规模交直流电网电磁暂态实时仿真,突破了扩大电网实时仿真规模的难题,进一步提升了交直流大电网仿真精度。基于HYPERSIM的大规模电网电磁暂态实时仿真技术的实现为未来大电网运行决策、规划校核、故障再现提供了新的技术手段。

Realization of Electromagnetic Real-time Simulation of Large-scale Grid Based on HYPERSIM

Continuous development of Chinese AC/DC combined grid demands for better performance of power system simulation technology. To comprehend the behavior of the complicated grid and mechanism of interaction between AC and DC, a comparatively more accurate way is to simulate the large-scale network model by electromagnetic transient software in real-time with actual DC control and protection devices linked. It is known that the simulation time step should be small enough(microsecond level) so that physical DC controllers can be connected to achieve hybrid simulation.Nevertheless, to operate a grid model of thousands of buses with a time step of microsecond level demands for reasonable decoupling and strictly real-time. It is the precondition of digital-analog hybrid simulation, and a great challenge to all experts in the field of power system real-time simulation of the world also. Based on task mapping and parallel computing technology, power system real-time simulator HYPERSIM and supercomputer SGI are used in this paper to execute the hybrid simulation. Considering of the processor’s computational capability, on account of naturally decoupling by long distributed parameter lines, this paper optimizes the method of large grid decoupling, splits a tremendous, sophisticated region grid model into distributed tasks reasonably. The automatic task mapping function in HYPERSIM is explored in depth. A synthetic method about multiple auto-assigned parameters optimization is proposed. The requirements of simulation:precision and real-time performance are met in the same time.Containing 17746 single phase buses, an electromagnetic transient network model can be operated in real-time eventually, which is a breakthrough on scale expanding of real-time simulation. The precision of AC/DC grid simulation makes a step further. The realization of massive grid model real-time operation gives a new technical means for operating, decision-making, planning and failure reproduction of future power grid.