Double-fed wind generating set control system and stable control method

A double-fed wind power generation and unit control technology, applied in wind power generation, greenhouse gas reduction, energy storage, etc., can solve problems such as system instability, and achieve the effect of promoting development and improving safety and stability

Inactive Publication Date: 2011-01-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

[0004] The present invention is aimed at the problem that the power grid fails, the wind power generating set goes off-grid, and the system is unstable when the wind power generating set is running at low voltage, and proposes a double-fed wind power generating The DC side capacitance under fault conditions improves the safety and stability of the DC side voltage of the doubly-fed wind turbine converter and protects the grid side converter

Method used

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  • Double-fed wind generating set control system and stable control method
  • Double-fed wind generating set control system and stable control method
  • Double-fed wind generating set control system and stable control method

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Embodiment Construction

[0016] The structural block diagram of the doubly-fed wind turbine with crowbar protection control circuit, DC side energy storage battery and control circuit is as follows: figure 1 As shown, the power grid directly enters the generator 3 through the second transformer 4, and then passes through the first transformer 7, the grid-side converter 6, and the rotor-side converter 5 to the generator 3 in sequence, and the generator 3 outputs to the gearbox 2 To drive the wind turbine 1, a DC bus capacitor 14 is connected in parallel between the grid-side converter 6 and the rotor-side converter 5, and the crowbar protection circuit 13 is connected in series. The first control circuit 12 is connected to the rotor-side converter 5, and the second control circuit 8 is connected to The grid side converter 6 and the DC side energy storage battery 9 are connected to the DC bus capacitor 14 through the bidirectional DC / DC battery side converter 11 , and the energy storage battery 9 can be ...

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Abstract

The invention relates to a double-fed wind generating set control system and a stable control method. An energy storage cell is added at the DC side of a back-to-back converter of a double-fed motor, the DC side energy storage cell is connected to a DC bus capacitor by the double-way DC/DC cell side converter, and a third control circuit controls the cell converter to charge and discharge the energy storage cell. The cell can send active power and adsorbs the active power under the necessary condition, and residual energy is stored in the energy storage cell during breakdown. The invention provides the guarantee for the low voltage of wind power generation and improves the safety and stability of the voltage of the DC side of the converter of the double-fed wind generating set, thus further accelerating the better development of wind power generation.

Description

technical field [0001] The invention relates to a power generation control technology, in particular to a doubly-fed wind power generating set control system and a stability control method. Background technique [0002] In recent years, the proportion of wind power in the power supply has grown rapidly. The doubly fed induction generator (DFIG) has the advantages of independent adjustment of active and reactive power and the small capacity required by the excitation frequency converter. It has been widely used in wind power generation systems. widely used. As the capacity of wind turbines continues to increase, the interaction between wind turbines and the grid becomes very important. Once the grid fails and the wind turbines are disconnected from the grid, the wind turbines cannot maintain the voltage and frequency of the grid during the fault period. It is very unfavorable to the stability of the system, and the safe operation criterion of the power grid requires that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38
CPCY02E10/763Y02E10/766Y02E70/30Y02E10/76
Inventor 李东东张华杰符杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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