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Mathematical modeling method for harmonic region of large photovoltaic power station

A photovoltaic power station, mathematical modeling technology, applied in the direction of photovoltaic power generation, single network parallel feeding arrangement, etc., can solve problems such as ignoring harmonic factors

Inactive Publication Date: 2014-09-10
HUNAN UNIV +1
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Problems solved by technology

[0008] Scholars at home and abroad have carried out research on the mathematical modeling of photovoltaic power plants, but most of the modeling methods are in the fundamental wave domain, ignoring harmonic factors, so they can only be used to analyze the impact of fundamental wave disturbances on the power grid. It has great limitations when applied to harmonic analysis

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  • Mathematical modeling method for harmonic region of large photovoltaic power station
  • Mathematical modeling method for harmonic region of large photovoltaic power station
  • Mathematical modeling method for harmonic region of large photovoltaic power station

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Embodiment Construction

[0047] see figure 2 , is the topological structure diagram of photovoltaic inverter with photovoltaic array.

[0048] Among them, S and T are the light and the temperature of the photovoltaic panel, and U PV , I PV Output voltage and current for a single photovoltaic panel, N S , N P is the number of series and parallel connections of photovoltaic panels, C 1 is the DC side capacitor of the inverter, the output filter adopts LC filter, I o is the output current, E S is the grid voltage. The boost circuit is omitted, the photovoltaic array is directly connected in parallel with the DC side capacitor of the inverter, and then inverts through a three-phase bridge inverter circuit, and the output high-frequency voltage is filtered by an LC output filter to form a three-phase sinusoidal current and The voltage on the grid side is the same frequency and phase, realizing grid connection.

[0049] Among the various factors that affect the output characteristics of the photovo...

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Abstract

The invention discloses a mathematical modeling method for a harmonic region of a large photovoltaic power station. Factors such as a photovoltaic array, MPPT (maximum power point tracking), an inverter and a control system thereof, an output filter, a station load, a reactive power compensation device and a power transmission line are considered. Illumination, the temperature of a photovoltaic panel and the switching frequency of the inverter serve as external variables, and the output voltage of a photovoltaic power generation system and the like is equalized into a harmonic voltage source indicated by the external variables. A model built by the method can represent change of harmonic characteristics when the external variables are changed, can also represent parallel resonance of the station reactive power compensation device, distributed capacitance of the power transmission line and line impedance for harmonic current, and can further be directly applied to research of feasibility analysis and harmonic estimation of a large photovoltaic power station, design of power quality management equipment of the photovoltaic power station and the like.

Description

technical field [0001] The invention relates to a mathematical modeling method in the harmonic domain of a large-scale grid-connected photovoltaic power station. Background technique [0002] Thanks to the pull of the European photovoltaic market, China's photovoltaic industry has experienced rapid development after 2004, with an annual growth rate of more than 100% for six consecutive years. Photovoltaic power generation is developing towards large-scale and large-scale development. According to the latest "Twelfth Five-Year" plan for renewable energy by the National Energy Administration, the installed capacity of solar photovoltaic power generation in my country will reach 15 million kilowatts by 2015. Photovoltaic power generation has become my country's renewable energy industry. An important part of the energy development strategy. Due to the different operating mechanisms of photovoltaic power plants and conventional power plants, the grid connection of large-capacity...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 罗安谢宁徐欣慰成佳富郭佳才田园徐千鸣
Owner HUNAN UNIV
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