Low voltage generator used for low voltage ride through testing and voltage control method of low voltage generator

A low-voltage ride-through and generation device technology, applied in photovoltaic power generation, wind power generation, single-grid parallel feeding arrangement, etc., can solve problems such as complex control methods

Active Publication Date: 2013-06-26
XJ ELECTRIC +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a low-voltage generating device and its voltage control method for low-voltage ride-through test, which is used to solve the relatively complicated problem of the existing control method

Method used

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  • Low voltage generator used for low voltage ride through testing and voltage control method of low voltage generator
  • Low voltage generator used for low voltage ride through testing and voltage control method of low voltage generator
  • Low voltage generator used for low voltage ride through testing and voltage control method of low voltage generator

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Embodiment Construction

[0082] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0083] Such as Figure 4 As shown in , the whole device consists of back-to-back three-phase voltage source converters, including sequentially connected power sources (such as Figure 4 Coupling transformer), rectifier, three-phase PWM inverter and filter are used, and the output of the filter is used to connect the device under test; the three-phase PWM inverter adopts open-loop control, and its PWM controller includes: respectively output Modulation m d + 、m d - 、m q + 、m q - The positive sequence d axis component given unit, the negative sequence d axis component given unit, the positive sequence q axis component given unit and the negative sequence q axis component given unit; angle θ, -θ), to obtain the positive and negative sequence components m of the α and β axes in the two-phase stationary coordinate system ds + 、m ds - 、m qs + 、m qs ...

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Abstract

The invention relates to a low voltage generator used for low voltage ride through testing and a voltage control method of the low voltage generator. The modulation degree of a d-axis positive sequence and d-axis negative sequence are respectively given, and various voltage drop working conditions such as single-phase unbalance drop, two-phase unbalance drop and three-phase balance drop can be obtained. As the whole device adopts the power electronic converter and applies a full-digital control technology, the low voltage generator has the advantages of simple and flexible control, small device volume, low cost and the like, and can be widely used in on-site grid-connection and acceptance testing of photovoltaic power stations and wind power plants.

Description

technical field [0001] The invention relates to a low-voltage generating device used for low-voltage ride-through testing, and a voltage control method applied to the device. Background technique [0002] As photovoltaic power generation and wind power generation account for an increasing proportion of electric energy, the impact of photovoltaic power generation and wind power generation systems on the power grid can no longer be ignored, especially for the large-scale centralized access of photovoltaic and wind power in my country. When a fault causes a voltage drop at the grid-connected point, once the photovoltaic inverter and wind turbine are automatically disconnected from the grid, the voltage and frequency of the grid may collapse, seriously affecting the safe and stable operation of the grid, and greatly limiting the large-scale utilization of new energy. Therefore, large-scale grid-connected photovoltaic inverters and wind turbines must have low-voltage ride-through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56Y02E10/76
Inventor 姚为正张建刘刚张海龙王林黄辉桑福环芦开平
Owner XJ ELECTRIC
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