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PDF(433 KB)
PDF(433 KB)
混合仿真电流源等值误差机理分析及改进
Current Source Equivalent Error Mechanism Analysis and Its Improvement for Hybrid Simulation
传统的机电-电磁暂态仿真中电磁侧在机电侧的等值方式主要有电流源、诺顿等值电路和功率源等。分析了电磁侧在机电侧电流源等效的误差产生机理，指出在电磁侧故障期间仅传递接口的电流幅值和相位难以满足机电侧的精确求解。结合接口的电压约束和功率约束，提出了一种区别于电流源的等值方式。该等值方式利用机电侧上一个步长的信息，将传统的电流源等值直接参与机电网络求解的方式改为迭代求解，从而改善了电流源等值方式，在故障期间由于不能保证接口功率传递，而带来的计算不准确问题。在PSCAD/EMTDC环境中，搭建了基于PSCAD+C架构的含有两回直流输电线路的，IEEE 39节点系统机电-电磁暂态混合仿真平台。仿真结果表明，所提出的电流源改进等值方式可以显著改善故障期间机电侧的仿真精度。
In traditional electromechanical-electromagnetic transient simulation， the equivalent methods of electromagnetic side system in electromechanical side mainly include current source， Norton equivalent circuit， power source etc. This paper analyzes the error mechanism of current source equivalent of electromagnetic side system in electromechanical side， and points that only transmitting the current information including magnitude and phase cannot ensure the right calculation for electromechanical side during the fault in electromagnetic side. In combination with the voltage and power constraints of the interface， we propose a equivalent method which is different from the current source. With using a step information on the electromechanical side， this method changes the calculation method of electromechanical side network from the way with the current source equivalent directly involved into iterative solution， which can solve the calculation accuracy problem of current source equivalent method caused by can't ensuring the power transmitting of the interface. An electromechanical-electromagnetic transient hybrid simulation platform of IEEE-39 node system with two DC links is built in PSCAD/EMTDC environment based on PSCAD+C. The simulation result shows that the proposed current source equivalent method can significantly improve the simulation accuracy of electromechanical side during fault.
hybrid simulation / error mechanism / equivalent method / current source
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中央高校基本科研业务费专项资金资助项目（2015XS22）
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