Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system

A DC bus voltage, hybrid system technology, applied in wind power generation, AC network load balancing, greenhouse gas reduction, etc., can solve the problems of general control effect and can not fully reflect the fast charging and discharging characteristics of super capacitors.

Inactive Publication Date: 2014-05-21
TONGJI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The patent "A Permanent Magnet Synchronous Wind Power Generator Grid-connected System" (application publication number CN103219740) proposes a wind power generation system based on solid-state transformers. In the energy storage part, the DC-DC converter is simply controlled by PI Control, the control effect is average, and at the same time only simulated the charging of the supercapacitor, it cannot fully reflect the fast charging and discharging characteristics of the supercapacitor

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  • Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system
  • Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system
  • Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system

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Embodiment

[0067] Such as figure 1 Shown is the permanent magnet synchronous wind power grid-connected system based on solid-state transformers provided by the embodiment of the present invention, including permanent magnet synchronous generators, generator-side rectifiers, solid-state transformers, and grid-side inverters. After these four modules are connected in sequence Connect to the grid. The working process of the whole system is: the fan is directly coupled to the rotor of the permanent magnet synchronous generator, the alternating current output on the stator side is converted into 1200V direct current by a rectifier, modulated into a high-frequency square wave by a single-phase full-bridge inverter, and the high-frequency transformer converts the voltage After being raised, it is converted into 18kV DC by a single-phase full-bridge rectifier, and finally converted into a constant-frequency and constant-voltage 10kV AC by a high-voltage side inverter and then sent to the grid. ...

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Abstract

The invention relates to a controller and a control method for voltage stabilization of a wind power DC (direct current) bus based on a hybrid system. At a low voltage DC side of a novel permanent magnetic wind power integration system based on a solid state transformer, a super capacitor is added by a bidirectional DC-DC conversion unit, a hybrid system model is built based on a Boost circuit, a quasi-sliding mode control policy is introduced. By utilizing the quick charge and discharge characteristics of the super capacitor, the stability of DC voltage is improved. The invention further discloses a control implementation method of the controller. The DC-side voltage fluctuation of the integration system, charge and discharge voltages as well as charge and discharge currents of the super capacitor are diminished, thereby implementing fast and accurate inhibition on the voltage fluctuation of the DC bus of the wind power system, and improving power quality and stability of the integration system.

Description

technical field [0001] The invention relates to a wind power direct current bus voltage stabilization control technology, in particular to a wind power direct current bus voltage stabilization controller and control method based on a hybrid system. Background technique [0002] In a wind power generation system, when the wind speed changes strongly, it will cause relatively severe fluctuations in the DC side voltage, which in turn will affect the stability of the grid-connected voltage. In addition, the drop of the grid voltage will cause the voltage fluctuation of the DC side of the wind power system, and even cause the power imbalance of the converter on the generator side, and the wind turbine unit will be disconnected from the grid, posing a threat to the stability of the grid and power quality, causing huge losses. [0003] From the above two problems, it can be seen that in order to ensure the stability of the network and the quality of power, it is the key to suppress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/28
CPCY02E10/76Y02E70/30
Inventor 张明锐李元浩
Owner TONGJI UNIV
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