观音岩直流分网接入方式下直流控制系统设计

首先对观音岩直流多种运行方式下的直流控制系统整体结构进行了详细分析,发现在分网接入方式下虽仍可借鉴常规直流的设计经验,但直流控制系统结构仍需调整。文中将双极层功能配置在直流站控中,多运行方式间的转换及控制功能配置在交流站控中,分网接入端的稳定控制功能按极配置以适应不同运行方式的需要。此外,由于异步联网过渡期间分网接入端的两交流系统仍存在耦合,通过对受端系统的等效和定性分析,发现两交流系统间的无功耦合程度较弱,交流滤波器分开配置和无功功率独立平衡方案仍然适用。最后基于实际装置搭建了整个直流控制系统,并通过实时数字仿真(RTDS)验证了控制系统设计的合理性和有效性。

Control System Design for Guanyinyan HVDC Transmission Project in Split-connection Mode

Firstly, the overall structure of the control system in multi-operation modes is analyzed. It is found that the control system design is similar to the conventional HVDC system because of its similar structure at DC side. While there are still some differences in the inverter station, the control functions in bipolar level need to be implemented in the DC station control and the function for the operation mode transform is configured in the AC station control. Nevertheless, the stability control function shall be carried out according to each pole to adapt to its different operation modes. Secondly, the coupling between the two AC systems during the transition period before the asynchronous interconnection finally achieved was also analyzed. Owing to the weak coupling of the two AC systems, the AC filters arrangement and reactive power control can be done independently. Finally, the complete control equipment was installed for the Guanyinyan HVDC transmission project, and some results on the real-time digital simulator(RTDS)verify the rationality and validity of the control system.