Coordinated control method for multi-DC power emergency support
An emergency support, DC power technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, AC networks with the same frequency from different sources, etc., can solve problems such as DC commutation failure, affecting system operating performance, and grid impact , to avoid chain accidents and improve transient stability
Active Publication Date: 2021-02-23
NARI TECH CO LTD +2
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Problems solved by technology
However, when the DC control system urgently adjusts the transmission of active power, it not only changes the reactive power consumed by the converter station, but also affects the safety and stability margin of the AC system where the converter station is located.
When the DC converter station is connected to the weak AC system, if the power command is unbalanced or the capacity of DC power modulation at this end is too large, it will not only easily cause DC commutation failure, but also may affect the AC system where the DC at this end is located. The safety and stability of the system will affect the performance of the entire system
[0005] In addition, the biggest difference between DC power support and conventional emergency control measures is that in AC emergency control, the fault disturbance is solely borne by the fault-occurring power grid, and the control itself will not affect the asynchronously connected power grid, while DC The sending and receiving end power grids are affected at the same time
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[0064] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0065] Such as figure 1 As shown, the system is divided into a four-layer structure, from top to bottom are the cross-regional control master station, the control master station of each regional power grid, the DC control master station of each regional power grid, and the DC control sub-station of each regional power grid. For power shortage accidents fed into the power grid, the coordination and cooperation between the DC control sub-stations, the DC control master stations of each regional power grid, the control master stations of each regional power grid, and the cross-regional control master station make the regional power grids reasonably Provide power support to avoid damage to the stab...
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The invention discloses a multi-DC power emergency support coordination control method, aiming at the loss of incoming power outside the high-power area of the network or the tripping fault of the high-power unit when the multi-DC feed-in power grid occurs, if the power shortage is greater than the maximum tolerable power grid of the area Unbalanced power, using the emergency power support capability of other non-faulty DC in the network, quickly and effectively adjust the DC power injected into the AC system, and orderly allocate the power deficit of the receiving-end grid fed by multiple DC feeds to the sending through DC asynchronous interconnection. terminal grid. Based on the current operating status of the AC-DC system and the inherent characteristics of the AC-DC grid, this strategy can determine the emergency support power of multiple DC circuits in the network in real time. On the one hand, avoid chain accidents caused by unreasonable emergency control instructions, and improve the transient stability of the power grid.
Description
technical field [0001] The invention relates to a multi-DC power emergency support coordination control method, which belongs to the technical field of electric power systems and automation thereof. Background technique [0002] At present, many regions in my country have formed a grid structure with multiple DC feeds, and the proportion of DC capacity in the entire power transmission capacity has increased significantly. The impact of DC characteristics on the safety and stability of the power grid has become a concern. The control and adjustment of the DC transmission system can perform fast and multi-mode adjustments, which can not only ensure the various transmission modes of the DC transmission, improve the operating characteristics of the DC transmission system itself, but also improve the operating performance of the AC system at both ends. Therefore, the control and regulation of DC transmission plays an important role in the safe and economical operation of the enti...
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IPC IPC(8): H02J3/24H02J3/06
CPCH02J3/06H02J3/24H02J2203/20
Inventor 吴雪莲李兆伟方勇杰刘福锁李威李碧君黄慧张子龙谭真罗峰崔晓丹侯玉强张倩赵彦丽
Owner NARI TECH CO LTD