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A cascaded photovoltaic grid-connected inverter and its control method

A technology of inverter and photovoltaic, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., to achieve the effect of reducing cost, improving safety and stability, and saving space

Active Publication Date: 2011-12-21
GUANGZHOU ZHIGUANG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The primary purpose of the present invention is to solve the contradiction between system capacity and power quality in the existing technical solutions, solve the problems caused by the step-up transformer, and provide a cascaded photovoltaic grid-connected inverter

Method used

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  • A cascaded photovoltaic grid-connected inverter and its control method
  • A cascaded photovoltaic grid-connected inverter and its control method
  • A cascaded photovoltaic grid-connected inverter and its control method

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the implementation and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0023] The inverter of the present invention adopts such as figure 1 The shown structure includes a photovoltaic array 1 and several cascaded unit bodies 2 , the photovoltaic array 1 includes several photovoltaic units, and each photovoltaic unit is connected to the input side of a unit body 2 .

[0024] Each of the above-mentioned photovoltaic units is formed by connecting several identical photovoltaic panels in series to form several battery strings, and then connecting several battery series in parallel; the installation environment of each photovoltaic unit is as consistent as possible to ensure that each of the photovoltaic arrays Characteristics such as voltage level and power level of the photovoltaic unit are the same.

[0025] like figure 2 As shown, each...

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Abstract

The invention discloses a cascaded photovoltaic grid-connected inverter and a control method. The cascaded photovoltaic grid-connected inverter has the advantages of high voltage level, high power level, high power quality and the like, and can realize direct high voltage grid connection without any transformer to save cost and an occupied area. The inverter comprises a photovoltaic array and a plurality of cascaded unit bodies. The photovoltaic array comprises a plurality of photovoltaic units of which each is connected with the input side of a corresponding unit body. Each unit body is a single-stage single-phase photovoltaic grid-connected inverter which comprises a DC bus capacitor and an H bridge inverter circuit, wherein the DC bus capacitor is connected in parallel to the input endof the single-stage single-phase photovoltaic grid-connected inverter; and the H bridge inverter circuit is connected in parallel with the DC bus capacitor.

Description

technical field [0001] The invention relates to a cascaded photovoltaic grid-connected inverter and a control method thereof. Background technique [0002] Solar energy is an inexhaustible renewable energy source, which has the advantages of cleanness, safety, and extensive use. Theoretically, if all the energy transmitted from solar energy to the earth is converted into electrical energy, the annual power generation is equivalent to 40 times the current energy consumption in the world. With the reduction of the cost of photovoltaic power generation and the desperation of fossil energy, high-power photovoltaic grid-connected power generation is an inevitable choice. [0003] At present, MW-level photovoltaic grid-connected power generation is usually boosted by several kW-level photovoltaic grid-connected inverters through a common transformer, and then unified and connected to the high-voltage grid. However, as the power level increases, the operating frequency of the swi...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 孙开发许贤昶邱培春刘满仓
Owner GUANGZHOU ZHIGUANG ELECTRIC CO LTD
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