Voltage reactive power coordination control method for multi-wind-power-plant chained access power grid
A technology of access to the power grid and coordinated control, which is applied in the direction of wind power generation, electrical components, circuit devices, etc. Problems such as low qualified rate of field group voltage
Pending Publication Date: 2021-11-30
LONGYUAN BEIJING WIND POWER ENG TECH +1
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Problems solved by technology
For the wind farms connected to the power grid in a chained manner, the electrical connection between the farms is tight, and the voltages between the buses are mutually restrained. The independent AVC control system of a single wind farm does not consider the voltage coupling between the wind farms. As a result, the overall voltage qualification rate of the wind farm group is low, and the actual control cannot meet the assessment requirements of the power grid for the wind farm bus voltage qualification rate
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[0094] Specific examples: such as image 3 As shown, a calculation example of an actual wind farm group with three wind farms connected to the power grid is used to verify the feasibility of the voltage and reactive power coordination control method for multiple wind farms connected to the power grid in the present invention. where U 1 , U 2 , U 3 Assess the busbar voltage for the wind farm group, U 4 is the voltage of the grid-connected point of the wind farm group. When the wind farm is in operation, the power grid will issue the target value of the bus voltage of the wind farm group every 4 minutes, and the bus voltage of the wind farm group is considered to be qualified within ±0.5kV of the target value, that is, U i.refmin =U i.ref -0.5, U i.refmax =U iref +0.5, otherwise it is unqualified. The line parameters of the wind farm group connected to each assessment bus are shown in Table 1.
[0095] Table 1 Example topology line parameters
[0096]
[0097] The a...
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The invention relates to a voltage reactive power coordination control method for a multi-wind power plant chain type access power grid, which is characterized in that a wind power plant access power grid operation simplification model is established and comprises balance nodes, wind power plant assessed nodes and branches for connecting the nodes. The reactive power resource input rate eta i of the wind power plants is defined, the minimum sum of the eta i of the wind power plants is taken as a target, the active and reactive power balance of the wind power plants is taken as equality constraints, and the bus operation voltage range and the reactive power equipment capacity of the wind power plants are taken as non-equality constraints. The reactive power minimum input amount required by the wind power plant voltage running within the qualified range is obtained through iteration solution, reactive power output of each wind power plant is obtained according to reactive power resource capacity distribution of each wind power plant, the reactive power output of each wind power plant is substituted into the original topology of the wind power plant to calculate reactive power loss, the final reactive power optimization value of each wind power plant is obtained, and each wind power plant is adjusted by adopting the final reactive power optimization value, so that the voltage qualification rate of the assessment nodes in the wind power plant group is integrally improved, and the operation economy of the wind power plant is improved.
Description
technical field [0001] The invention relates to the operation control of wind farms connected to the power grid, in particular to a voltage and reactive power coordination control method for multiple wind farms connected to the power grid in a chained manner. Background technique [0002] When large-scale wind power is connected to the grid, due to the characteristics of randomness, intermittent, and uncontrollable wind turbine output, the voltage of the busbar inside the wind farm and the busbar connecting the wind farm to the grid fluctuates greatly, and the voltage of the wind farm connected to the grid is stable. Sex is challenged. Under the new situation that wind power is connected to the grid on a large scale, the grid requires wind farms to be equipped with reactive power regulation resources and automatic voltage control systems (automatic voltage control, AVC). Among them, the function of the AVC system of the wind farm is to dynamically adjust the amount of react...
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IPC IPC(8): H02J3/50
CPCH02J3/50H02J2300/28H02J2203/10H02J2203/20Y02E10/76Y02E40/30
Inventor 唐坚穆钢夏晖苏建涛岳俊红张博冯江哲严干贵黄亚峰钱伟强朱登宝周银
Owner LONGYUAN BEIJING WIND POWER ENG TECH