【摘要】 为了利用直流大功率快速可控的特性来提高电力系统暂态稳定性,设计了基于Bang-Bang控制的直流大信号暂态稳定控制器,包括控制策略的设计和关键参数的选择。详细分析了暂态过程中换流母线电压和系统短路比对直流功率提升能力的影响,提出了直流暂态稳定控制的功率阈值选取原则。在三机系统模型中研究了直流功率控制的上升/回降速率和死区阈值的选择对控制性能的影响。在南方电网直流控制保护详细模型中测试了暂态稳定控制器的控制效果,结果表明:同一运行条件下,当无控制器投入时,系统会出现暂态功角失稳;当在±800 k V楚穗直流中加入控制器后,系统能保持暂态功角稳定,验证了控制器能有效提高系统的暂态稳定性。更多还原

【Abstract】 Since the power of high voltage direct current(HVDC) can be quickly modulated, HVDC large-signal modulation provides an effective solution to improving the power system transient stability. We proposed a large-signal controller for HVDC based on Bang-Bang control. Specifically, we discussed the control principle, design framework, and parameter tuning strategy.Moreover, we analyzed influences of the voltage and the short circuit ratio(SCR) at the converter bus on the HVDC power modulation capability, and proposed a principle to select the amplitude of the HVDC power modulation. The impacts of HVDC power changing rate and dead-band values on the controller performance were studied in a three-generator system. Then the proposed controller was evaluated on the detailed electro-magnetic transient simulation model of the China Southern Grid(CSG). The simulation results validate that a significant transient stability improvement can be achieved with our controller.更多还原