Wind farm and junction station time series coordination control method during concentrated wind power access
A centralized access and coordinated control technology, applied in wind power generation, single-network parallel feed arrangement, etc., can solve the problem of frequent input of reactive power equipment into reactive power circulation, affecting the safety and reliable operation of the power system, and endangering the voltage stability of the power system, etc. problem, to achieve the effect of increasing reactive power range, improving voltage stability, and solving reactive circulating current
Active Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +3
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Problems solved by technology
However, during operation, some problems often occur. In the actual system, the coordination relationship between the two is not well handled, resulting in frequent input of reactive power equipment, reactive power circulation and other problems, which endanger the voltage stability of the power system and further affect the entire power system. Safe and reliable operation of the system
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[0027] The method is described in detail in conjunction with the accompanying drawings and a specific embodiment as follows:
[0028] figure 2 It is a typical wind farm grid connection diagram. The fans in the wind farm are connected to the 35kV high-voltage bus on the wind farm side after passing through the step-up transformer, and then connected to the 220kV power grid through the 220kV hub substation. Power and voltage control equipment, such as capacitor banks, static var generators, transformer taps, etc. In the 220kV hub substation, there are generally 220 / 35kV double-winding transformers or 220 / 110 / 35kV three-winding transformers or both.
[0029] The method of the present embodiment comprises the following steps: the general setting control period is 5-10 minutes, and the present embodiment setting control period is 5 minutes;
[0030] 1) The control cycle begins, and the wind farm busbar and the 220kV hub substation transformer high-voltage side winding voltage co...
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The invention relates to wind farm and junction station time series coordination control method during concentrated wind power access and belongs to the technical field of automatic voltage control of electrical power systems. According to the actual situation that most of wind power farms are accessed to a power grid through transformer substations, the time series coordination control of the wind farms and junction stations is adopted based on existing wind power control strategies and existing transformer substation control strategies, and accordingly the problems including reactive loop current, frequent capacitor switching and the like caused by isolated control are solved. The reactive power margin is increased, and accordingly the voltage stability of the electrical power systems is improved. The wind farm and junction station time series coordination control method acts on a secondary control plane of voltage control, and the shortcomings of the transformer substation and wind power farm isolated control in the original secondary control are made up.
Description
technical field [0001] The invention relates to a time-series coordinated control method for a wind farm and a hub substation in a wind power centralized access area, and belongs to the technical field of automatic voltage control of electric power systems. Background technique [0002] Due to the shortage of coal resources, countries around the world have invested a lot of manpower and material resources to explore new energy utilization models. Wind energy has become one of the green energy sources with great development potential recognized worldwide. [0003] At present, there are two ways for wind turbines to be connected to the power grid. One is to build a wind farm, and the wind turbines in the field are integrated into the medium-voltage network through a large-scale substation. The other is to use a distributed method to connect each wind turbine to the low-voltage network. , to supply power directly to the end user. Among them, the first method can generate a con...
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 常晓慧汤磊王双于磊许晓菲谢旭贾琳初祥祥张宝英郭庆来谷文旗周鑫韩宇龙朱梅付启穆亮王延平
Owner STATE GRID CORP OF CHINA