直流换相失败及恢复过程暂态无功特性及控制参数影响

发布时间：2018-06-22 16:17

本文选题：换相失败及恢复过程 + 送受端系统　；参考：《高电压技术》2017年07期

【摘要】：直流换相失败过程中与送受端系统交换的无功功率大幅变化,表现为对系统不利的"无功冲击负荷"特性,亟需对直流换相失败过程中的送受端暂态无功特性开展深入研究。为此,首先给出了直流稳态运行和暂态过程中的送受端无功方程,然后分别分析了换相失败期间和恢复过程中直流送端和受端的暂态无功特性,最后在此基础上研究了直流控制系统参数对暂态无功特性的影响,并通过直流等值系统算例进行了验证。研究结果表明,换相失败期间,直流从受端系统吸收一定的无功功率,同时对送端系统先吸收大量的无功功率、再发出大量的无功功率;换相失败恢复过程中,直流对受端系统通常先发出大量的无功功率、再吸收一定的无功功率,同时从送端系统吸收一定的无功功率。通过优化直流低压限流环节、换相失败预测、电流控制器等重要控制参数,可以减小换相失败过程中直流与送受端系统交换的最大无功功率。
[Abstract]:During the process of DC commutation failure, the exchange of reactive power between DC commutation failure and receiving terminal system is greatly changed, which is unfavorable to the system. It is urgent to study the transient reactive power characteristics of the receiving terminal in the process of DC commutation failure. For this reason, the reactive power equations of the receiving end in the steady operation and transient process of DC are given, and the transient reactive power characteristics of the DC terminal and the receiver during the commutation failure and recovery are analyzed, respectively. Finally, the influence of DC control system parameters on transient reactive power characteristics is studied and verified by an example of DC equivalent system. The results show that during commutation failure, DC absorbs a certain amount of reactive power from the receiving system, at the same time, it absorbs a large amount of reactive power first and then emits a large amount of reactive power. The DC / receiver system usually emits a large amount of reactive power first, then absorbs a certain amount of reactive power, and at the same time absorbs a certain amount of reactive power from the terminal system. By optimizing the low voltage DC current limiting link, commutation failure prediction, current controller and other important control parameters, the maximum reactive power exchange between DC and receiving terminal system can be reduced in the process of commutation failure.
【作者单位】：中国电力科学研究院;
【基金】：国家电网公司科技项目(XT71 16 046) 国家重点研发计划(2016YFB0900805)~~
【分类号】：TM721.1

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