Overall collaborative low voltage ride through control method and application thereof

Abstract

The invention relates to the technical field of power system analysis, in particular to an overall collaborative low voltage ride through control method and application thereof, and the method comprises the steps: analyzing the influence mechanism of grid-connected reactive power output of multiple DC / AC converter stations on the port voltage of a near-fault DC / AC converter station in combination with the mechanism of reactive power supporting voltage; on the basis, a two-stage coordination control strategy is adopted, and on the basis of a scene-divided refined coordination mechanism, the reactive current output of the DC / AC converter station is subjected to universal setting, and a set of automatic setting process is given. The control method provided by the invention solves the problems of lack of reactive power coordination strategies of multiple converter stations and difficulty in setting the reactive power current compensation amount in the offshore wind power direct-current boost collecting and sending-out system during the low-voltage crossing period, can be popularized to a multi-station overall grid-connected system, can solve the reactive power coordination problem in various low-voltage crossing scenes, and has a wide application prospect. And the fault ride-through capability of the whole system is improved.

Description

technical field [0001] The invention relates to a low-voltage ride-through control method, in particular to an overall coordinated low-voltage ride-through control method and application thereof, which is suitable for an offshore DC boosting collection and transmission system, and belongs to the field of large-scale offshore wind power collection and long-distance transmission. Background technique [0002] The offshore wind power DC two-stage boost scheme can not only reduce the loss of the collection cable, reduce the investment cost, but also avoid the reactive voltage problem faced by the AC collection scheme, which has become the development trend of large-scale offshore wind power collection and long-distance transmission in the future. When the AC outgoing line fails, the capacity of each DC / AC converter station and its port voltage are different, and the near-faulty converter equipment has a weaker non-functional capability, and there is a risk of low-voltage disconne...

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Problems solved by technology

此外,公开号:CN105429183A、CN113765133A、CN112398156A、CN113852126A、CN113964864A、CN111162562A、CN112421682A、CN111600334A、CN111049399A、CN114221370A、CN113904366A、CN113972681A、CN106099968A、CN113904365A、CN113852090A、CN112713617A等现有技术都涉及海上风电送出系统的低压穿越控制 However, after serious research in this application, it is believed that none of the above-mentioned prior art has studied the coordinated control of reactive power output of each DC / AC converter station during the period of low voltage ride through, and lacks a set of effective reactive power coordinated control strategy

It is impossible to realize the universal setting of reactive power coordination output of each DC / AC converter station, and it is also impossible to extend its technical solution to the overall grid-connected system of multiple stations (any number)

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