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Fast Cut Back Thermal Power Plant Load Rejection and Black Start Field Test Analysis

机译：快速削减火力发电厂的甩负荷和黑启动现场测试分析

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摘要

Fast and reliable black start plays a key role in improving the ability of the power system to resist the risk of large-scale blackouts. For a black start with high voltage and long-distance transmission lines, it is much easier to cause phenomena such as self-excitation and power frequency/operating overvoltage, which may lead to black start failure and impact the reliability of the system's restoration. Meanwhile, the long time needed to crank up the non-black start units will impact the speed of the restoration. This paper addresses the advantages of using a thermal power unit with a fast cut back (FCB) function as a black start unit, and studies the transient process of the FCB unit during the restoration. Firstly, key problems in the power system black start process are analyzed and a practical engineering criterion of self-excitation is proposed. Secondly, the dynamic model of the FCB unit is presented. Thirdly, the field test of the FCB unit load rejection and black start is introduced, which is the first successful field test of black start with 500 kV long-distance lines in China Southern Power Grid (CSG). Finally, the transient process of this test is simulated using the PSCAD/EMTDC software, and the simulation results accord well with the field test results, which verifies the correctness of the FCB model and the self-excitation engineering criterion proposed.
机译：快速可靠的黑启动在提高电源系统抵抗大规模停电风险的能力中起着关键作用。对于具有高压和长距离传输线的黑启动，更容易引起诸如自励磁和工频/工作过电压等现象，这可能导致黑启动失败并影响系统恢复的可靠性。同时，启动非黑启动单元所需的时间将影响恢复速度。本文阐述了使用具有快速还原（FCB）功能的火电单元作为黑启动单元的优势，并研究了恢复过程中FCB单元的瞬态过程。首先，分析了电力系统黑启动过程中的关键问题，提出了一种实用的自励磁工程判据。其次，提出了FCB单元的动力学模型。第三，介绍了FCB机组甩负荷和黑启动的现场测试，这是南方电网（CSG）首次成功进行500 kV长距离黑启动的现场测试。最后，使用PSCAD / EMTDC软件对该测试的瞬态过程进行了仿真，仿真结果与现场测试结果吻合良好，验证了FCB模型和提出的自励磁工程准则的正确性。

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