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Photovoltaic synchronization inverter with photovoltaic array IV test function and test method

A photovoltaic array and testing function technology, which is applied in photovoltaic modules, photovoltaic power generation, and measurement of electrical variables, etc., can solve problems such as difficult to meet various power stations and inconvenient operation, achieve convenient service life and fault analysis, and improve power generation efficiency Effect

Inactive Publication Date: 2012-05-09
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For on-site testing of photovoltaic arrays in high-power photovoltaic power plants, special test equipment is required, and it is not convenient to operate on site. The parameters of existing test equipment are difficult to meet the needs of various power plants.

Method used

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  • Photovoltaic synchronization inverter with photovoltaic array IV test function and test method
  • Photovoltaic synchronization inverter with photovoltaic array IV test function and test method
  • Photovoltaic synchronization inverter with photovoltaic array IV test function and test method

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Embodiment Construction

[0023] in figure 1 In the system of the present invention shown, ports SP and SN are the output ports of the photovoltaic array PV, K1 is a DC circuit breaker, which can be located outside or inside the system, manual or automatic, and U, V, and W are three inverter units. Phase output port, CT1 is the DC bus current sensor of the inverter unit, C1 is the DC filter capacitor, CT1 is located between the photovoltaic array PV and the filter capacitor C1, which can detect the output current of PV, VT1 is the DC voltage sensor, CT1 and VT1 are selected Precision high-speed Hall sensor, T1~T6 are the power module IGBTs in the inverter unit, and other components in the main circuit, including inductors and transformers, are set as usual.

[0024] When testing the photovoltaic array PV, first stop, disconnect K1 and disconnect the inverter from the grid, and then wait for the voltage of the main circuit filter capacitor C1 to gradually self-discharge and drop to a suitable low voltage. ...

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Abstract

The invention discloses a photovoltaic synchronization inverter with a photovoltaic array IV test function, which is composed of an inverter main circuit and a system controller; the inverter main circuit adopts an adjustable-voltage inverter and comprises a one-phase and three-phase synchronization system; the photovoltaic synchronization inverter is characterized in that: a current sensor CT1 for measuring photovoltaic array input current is arranged between a photovoltaic array input port and a filter capacitor C1; a direct-current bus bar voltage sensor VT1 for measuring the voltage of the filter capacitor C1 end is arranged; a direct-current breaker K1 is arranged at the photovoltaic array output port, the photovoltaic array output general current is input to the photovoltaic synchronization inverter, the direct-current bus bar voltage sensor VT1 and the current sensor CT1 through the direct-current breaker K1; the photovoltaic synchronization inverter is suitable for the conventional synchronization inverting system, can test the photovoltaic array IV characteristics of the system conveniently, and the test data is used for analyzing and evaluating the photovoltaic array characteristics of the system and the power generating capacity.

Description

Technical field [0001] The invention relates to a high-power photovoltaic grid-connected inverter device of tens of kilowatts to MW level, and more specifically a photovoltaic grid-connected inverter with a photovoltaic array IV test function and a test method. Background technique [0002] With the rapid development of solar photovoltaic grid-connected power generation, large-scale solar photovoltaic grid-connected power generation is the future development trend. There will be more and more large-scale or extra-large photovoltaic grid-connected power stations. Photovoltaic arrays are an important component of photovoltaic power generation systems. In part, it determines the power generation of the photovoltaic system and also accounts for the main part of the cost of the photovoltaic system. The power generation capacity of a photovoltaic array is theoretically the sum of the power generation capacity of all the single solar cell modules that make up the array, but in practice ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/48H02N6/00G01R31/00H02S40/32
CPCY02E10/563Y02E10/56
Inventor 苏建徽汪海宁杜燕张国荣茆美琴刘宁陈林
Owner HEFEI UNIV OF TECH
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