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Integrated method for realizing parallel operation power generation and power network reactive power compensation simultaneously

A power compensation and power grid technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, photovoltaic power generation, etc., can solve the problem of low utilization rate

Inactive Publication Date: 2004-08-25
SHANGHAI ELECTRIC POWER ELECTRONICS
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  • Application Information

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Problems solved by technology

The present invention can be used for grid-connected power generation and power grid reactive power compensation at the same time when the photovoltaic cell generates power without adding hardware equipment; when the photovoltaic cell does not generate power (such as at night), it can still perform reactive power compensation for the power grid. So as to solve the problem of low utilization rate of traditional photovoltaic grid-connected power generation system, and achieve the effect of simple and reliable system structure, high conversion efficiency and flexible use

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  • Integrated method for realizing parallel operation power generation and power network reactive power compensation simultaneously
  • Integrated method for realizing parallel operation power generation and power network reactive power compensation simultaneously

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Embodiment Construction

[0024] The following examples are provided in conjunction with the content of the method of the present invention:

[0025] Establish a photovoltaic grid-connected power generation system, which is composed of photovoltaic arrays, BOOST DC / DC conversion circuits, three-phase full-bridge inverters, voltage and current detection devices, and digital controllers. The short-circuit current of the photovoltaic cell is 3.4A, the open-circuit voltage is 360V, and the maximum output power is 1.2KW; the sampling period of the output voltage and current of the photovoltaic cell is 2ms, the scan time of the module realized by the MPPT algorithm is 0.2ms, and the duty cycle reference voltage increment is 0.01V , BOOST switching frequency is 40KHz, the DC side voltage of the inverter is 800V; the grid load is an inductive load, and its absorbed reactive power is set to 1KVar; the output capacity of the inverter is 5KVA, and the carrier frequency is 20KHz.

[0026] The specific implementati...

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Abstract

An integral method for realizing parallel generation and network reactive power compensation at the same time is based on the transient reactive power theory applying park transfer to transform a three phase inverter output current to a rotation dq coordinate to realize separation of active current and reactive current to convert the DC current of the photovoltaic to AC current by controlling the currents and directions carry out reactive power compensation to the local network. When a photovoltaic battery has enough energy to output, it realizes parallel generation and reactive compensation at the same time, when it stops the output, the inverter compensates the network independently.

Description

technical field [0001] The invention relates to an integrated method for simultaneously realizing grid-connected power generation and grid reactive power compensation, in particular to an integrated method capable of simultaneously realizing grid-connected power generation of photovoltaic cells and grid reactive power compensation. It belongs to the technical field of solar power generation and power electronics. Background technique [0002] At present, the application of photovoltaic is mainly in three aspects: DC power supply, independent inverter AC power supply and grid-connected power supply. Considering that most electrical equipment is currently powered by AC, converting the DC output from the photovoltaic array into AC has become a research focus in this field. For an independent low-power photovoltaic system, the inverter is used as a current conversion device to realize the power supply of the PV array to the AC equipment, so that the utilization value of photovo...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/38
CPCY02E10/563Y02E40/30Y02E10/56
Inventor 禹华军潘俊民
Owner SHANGHAI ELECTRIC POWER ELECTRONICS
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