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Coordinated control system and method based on current source multi-terminal DC wind farm unloading load

A coordinated control system and current source technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problem of huge output power, achieve fast adjustment, avoid the consumption of resistance power, and avoid the effect of shutdown

Active Publication Date: 2015-09-23
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the power adjustment range of wind turbines is limited, for large-scale wind farms, the controllable output power is very huge

Method used

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  • Coordinated control system and method based on current source multi-terminal DC wind farm unloading load
  • Coordinated control system and method based on current source multi-terminal DC wind farm unloading load

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] When the measured value of the DC side bus voltage is higher than its preset value, all the wind turbines complete the switching between the maximum power control mode and the DC voltage control mode. Compared with the maximum power control, the DC side voltage control has one more feedback link. The input of this feedback link is the error between the preset value of the DC side voltage and the measured value, and the proportional-integral controller generates a negative current value to reduce the reference value of the input current of the DC converter to limit the output power of the wind turbine, thereby maintaining Stability of DC side voltage. The wind turbine will run from the point of maximum power output to the right side of the wind turbine power curve, and the wind turbine speed increases.

[0037] B...

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Abstract

The invention relates to a control system and a control method in the technical field of wind power generation, and specifically relates to a coordination control system and method based on current source type multi-terminal DC wind field unloading. The system comprises a permanent magnetic wind power generator, a diode rectifier, a current source type DC-chopper and a current source type inverter. Each blower fan unit is connected in parallel with the same DC bus line through the DC-chopper and collected DC power is accessed into a network in an inverter mode through the current source type inverter. A DC-chopper control system is parallel connected with the input side of the DC-chopper. Propeller pitch control, blower fan maximum power control, DC side voltage control and DC-chopper control are combined into the coordination control method so that a wind electric power field can realize self adjustment through the coordination control method for satisfying the power demand of an electrical network for the wind electric power field.

Description

technical field [0001] The invention relates to a control system and a control method in the technical field of wind power generation, in particular to a coordinated control system and a control method based on unloading of a current source type multi-terminal DC wind field. Background technique [0002] In general, wind turbines in wind farms often operate on the optimal power curve to achieve maximum power tracking. With the development of control technology, the power grid puts forward higher requirements on the power generation characteristics of wind farms. It hopes that the power generation characteristics of wind farms will be closer to those of traditional thermal power plants. The rotational kinetic energy stored in the blades of a wind turbine can only support power generation control for a short time. Due to the influence of wind speed and power coefficient, the maximum output power that a wind turbine can provide is limited. Therefore, when the frequency at the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46
CPCY02E10/76
Inventor 范士雄刘广一蒲天骄杨占勇杨洋
Owner STATE GRID CORP OF CHINA
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