Multi-objective coordinated distributed wind farm reactive power optimization control method under different time scales

Abstract

The invention discloses a method of multi-target coordination reactive power optimization control of a distributed wind farm on the basis of different time scales. According to the method of multi-target coordination reactive power optimization control of the distributed wind farm on the basis of different time scales, different control targets are selected according to different time scales; according to millisecond-level reactive power optimization control, a system uses the instant maximum reactive power supporting capacity of a unit converter as a target; according to second-level reactive power optimization control, the system uses the minimum voltage deviation and the minimum short-time flicker as a comprehensive optimization target; according to minute-level reactive power optimization control, the system uses the minimum active power transmission loss as an optimization target. Reactive power optimization control of a plurality of targets is achieved through adjustment of the reactive power. According to the technical scheme, the distributed wind farm can run safely and economically, and reasonable reactive power distribution can reduce the transmission loss, improve the instant maximum reactive power supporting capacity of the unit converter and quality of electric energy, and ensure normal operation of a power grid.

Description

technical field [0001] The invention relates to a multi-target voltage control method under different time scales in reactive power optimization control of a distributed wind farm, and belongs to the technical field of reactive power voltage control for wind farm grid-connected operation. Background technique [0002] As the country attaches great importance to renewable energy power generation, wind power has become a new energy source with large-scale development and commercial development prospects. However, as a power source, wind power is random and intermittent. As more large-capacity wind farms are put into operation, technical problems such as wind power grid integration are becoming more and more prominent. The centralized large power grid has poor adaptability to load changes and is not flexible enough to operate. In this context, the state has proposed a policy to develop decentralized wind power. [0003] Compared with centralized power generation, distributed p...

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Problems solved by technology

[0008] In order to solve the above problems, the present invention proposes a multi-objective voltage control method layered by time in the reactive power optimization control of distributed wind farms, which establishes multi-objective functions under different time scales, and its purpose is to solve the problems in the prior art. The existing problems of ineffective control of voltage, frequent adjustment of equipment and high operating costs of the system

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