Wind farm grid-connected coordination control method

Abstract

The invention relates to a wind farm grid-connected coordination control method, and belongs to the technical field of wind farm grid-connected coordination control. The coordination control of the wind farm is acquisition of single equipment information, analysis of the acquired information by the wind farm and information application of power grid scheduling. According to a fan, wind farm and power grid three-level joint coordination framework, the function and the mutual coordination relationship of each level and each link is completely realized, so the whole wind farm has the running andcontrol characteristics of the traditional power station for the power grid, reduces the impact and influence on the power grid and even provides necessary support for the frequency modulation, voltage regulation and the like of the power grid. At the global and micro angle, under the support of the modern communication and analysis and computation technical capacities, the defects and adverse impacts of a fan individual are eliminated or reduced by utilizing horizontal whole and vertical whole joint coordination and mutual support, so the whole wind farm has the power grid-friendly characteristic, the grid-connected running time of the wind farm is prolonged and the economic benefit is greatly improved.

Description

technical field [0001] The invention relates to a wind farm grid-connected coordinated control method, and belongs to the technical field of wind farm grid-connected control. Background technique [0002] As a clean renewable energy, wind energy plays a positive role in increasing our energy supply, adjusting our country's energy structure and protecting the ecological environment. [0003] With the active promotion of new energy power generation in the country, more and more large-scale wind power bases have been constructed, and it has become the consensus of people from all walks of life to solve the problem of difficulty in connecting new energy power generation to the grid. [0004] However, two-thirds of China's electricity demand is concentrated in the eastern and central regions. Therefore, wind power in the "three north" regions cannot be consumed locally, and it needs to rely on high-voltage levels and large-scale long-distance transmission. In addition, wind powe...

AI Technical Summary

Problems solved by technology

Harmonics in the wind power system can increase the copper loss and iron loss of the generator, cause heating faults in capacitor banks and transformers, affect control circuits, and inaccurate sensor measurements, etc.

[0012]4) Impact on grid stability: wind turbines mostly use induction motors, and the operation of induction generators requires reactive power support

Although the power factor can be improved by investing in reactive power compensation devices, there is a time delay in frequent switching, which will inevitably pose a threat to the voltage stability of the grid-connected system

When the system voltage level drops, the amount of reactive power compensation drops a lot, but the wind farm’s reactive power demand for the grid increases instead, further deteriorating the voltage level, and in severe cases, it will cause voltage collapse and the wind turbines will be forced to stop

In addition, excessive output of wind farms may reduce the voltage safety margin of the grid and easily lead to voltage collapse

On the one hand, the main threat of grid-connected wind farms to the stability of the power grid is that the fluctuation and randomness of wind speed cause the output of wind farms to vary with time and are difficult to predict accurately, which leads to potential safety hazards when wind power is connected to the system

On the other hand, the voltage stability is reduced due to excessive wind power injection power in weak grids.

[0013]5) Impact on power grid relay protection devices: Sometimes the power flow of the wind farm and the power system connection line is bidirectional, which brings certain technical problems to the protection configuration difficulty

[0014] 2. The level of wind power technology and equipment is poor, and the ability of technological innovation is insufficient

[0015]3. Insufficient experience in wind power operation and dispatch management

However, these technologies are based on a series of basic assumptions based on a local perspective and specific problems. Due to the lack of overall planning for related links, it is difficult for each technology to be used alone to play a role in practice.

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