Photovoltaic Inverter Momentary Cessation: Recovery Process is Key
Photovoltaic Inverter Momentary Cessation: Recovery Process is Key
复制标题
光伏逆变器瞬间停运：恢复过程是关键
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Andy Hoke
中科院分区：
文献类型：
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作者：
B. Pierre;Mohamed E. Elkhatib;Andy Hoke
瞬时停止是指逆变器控制模式。当逆变器端子电压下降到低于（或超过）某个电平时，逆变器停止输出任何电流，但试图保持（或快速恢复）锁相环同步，以允许在电压恢复到某个点时快速重新注入电流。本文介绍了一种在PSS/E中开发的光伏发电瞬时停止模型。仿真的高压输电线路故障应急夏威夷岛的Oakland电力系统的验证PSS/E模型，修改，包括一个自定义的分布式光伏逆变器模型，和不同的不久的将来分布式光伏渗透水平。岛屿电力系统的模拟包括不同的渗透水平的PV，和不同的恢复时间（斜坡率和延迟）后瞬间停止。结果表明，在低电压事件，如故障，瞬时停止可能会产生严重的频率下的事件，导致显着的负荷下降，并在不久之后，在某些情况下，过频事件，导致发电跳闸离线。随着光伏的渗透率提高，这一问题更加严重。如果使用瞬时停止（如配电连接资源的典型情况），应仔细考虑瞬时停止后的恢复过程，以尽量减少对大容量电力系统稳定性的影响。
Momentary cessation refers to an inverter control mode. When the inverter terminal voltage falls below (or exceeds) a certain level, the inverter ceases to output any current, but attempts to maintain (or quickly regain) phase-locked loop synchronization to allow for quick reinjection of current when the voltage recovers to a certain point. This paper presents a photovoltaic (PV) momentary cessation model developed in PSS/E. Simulations are presented for a high voltage transmission line fault contingency in the Hawaiian island of Oahu power system on a validated PSS/E model, modified to include a custom distributed PV inverter model, and different near-future distributed PV penetration levels. Simulations for the island power system include different penetration levels of PV, and different recovery times (ramp rates and delays) after momentary cessation. The results indicate that during low voltage events, such as faults, momentary cessation can produce severe under frequency events, causing significant load shed and shortly thereafter, in some cases, over frequency events that cause generation to trip offline. The problem is exacerbated with higher penetration levels of PV. If momentary cessation is used (as is typically the case for distribution-connected resources), the recovery process after momentary cessation should be carefully considered to minimize impacts to bulk power system stability.