Photovoltaic flexibility grid-connection device and control method

A flexible and photovoltaic technology, applied in photovoltaic power generation, harmonic reduction devices, single-network parallel feeding arrangements, etc., can solve problems such as complex calculations, low-pass filter influence dynamics, and large calculation loads

Inactive Publication Date: 2013-03-13
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the current detection technology has the disadvantages of large amount of calculation, complex calculation or the use of low-pass filter to affect the dynamics

Method used

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  • Photovoltaic flexibility grid-connection device and control method
  • Photovoltaic flexibility grid-connection device and control method
  • Photovoltaic flexibility grid-connection device and control method

Examples

Experimental program
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Embodiment 1

[0058] figure 2 It is a device structure diagram of the photovoltaic flexible grid-connected system provided by the present invention.

[0059] The photovoltaic flexible grid-connected device provided in this embodiment includes: a supporting capacitor module 201, a voltage detection module 202, a PCC module 203, a current detection module 204, a controller module 205, a PWM pulse generation module 206, and an inverter module 207;

[0060] The supporting capacitor module 201 is used to stabilize the DC side voltage and provide the required reactive energy;

[0061] The voltage detection module 202 is used to collect the voltage of the supporting capacitor on the DC side, which is used as an input signal of the controller module;

[0062] The PCC module 203 is composed of a PCC switch and its control device, and serves as the connection point between the flexible grid-connected device and the load and the grid;

[0063] The current detection module 204 is used to collect the...

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Abstract

The invention discloses a photovoltaic flexibility grid-connection device and a control method. The photovoltaic flexibility grid-connection device comprises a support capacitance module, a voltage detection module, a program-controlled computer (PCC) module, a current detection module, a controller module, a pulse-width modulation (PWM) pulse generation module and a contravariant module. Voltage signals collected by the voltage detection module from two ends of the support capacitance module and power grid current signals of the PCC module collected by the current detection module serve as input signals of the controller module, outputs signals of the controller module serve as input signals of the PWM pulse generation module, pulse signals generated by the PWM pulse generation module are input in the contravariant module to control output of the contravariant module. The photovoltaic flexibility grid-connection device and the control method can achieve harmonic suppression and reactive compensation, can reduce impacts of load sudden change on the power grid, improve quality of photovoltaic system grid-connection current, have characteristics of the friendly power grid and are simple in control method.

Description

technical field [0001] The invention relates to a photovoltaic flexible grid-connected device and a control method. Background technique [0002] Under the situation of the shortage of traditional energy sources and the increasingly severe environmental pollution problems, the research and development of new energy sources have received widespread attention. Solar energy has become the most promising new energy source due to its many advantages. [0003] Photovoltaic power grid-connected technology mainly feeds active power to the large power grid. The system inverts the DC power of photovoltaic modules into AC power and feeds it to the large power grid through PCC (Point of Common Coupling). Flexible grid connection is a grid connection method that can realize harmonic suppression and reactive power compensation during the process of photovoltaic power generation grid connection, and can reduce the impact of sudden load changes on the power grid. [0004] New changes have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/18
CPCY02E10/563Y02E40/30Y02E10/56Y02E40/40
Inventor 李志勇沈玲菲范英彭敏陈世明
Owner CENT SOUTH UNIV
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