Photovoltaic power station transient model suitable for broadband oscillation analysis of large power grid
A photovoltaic power station, oscillation analysis technology, applied in photovoltaic power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problems of difficulty in adjusting the operation mode, difficult conclusion authenticity, low calculation efficiency, etc., to improve the model convergence and efficiency. Computational efficiency, simplifying high-frequency dynamic processes, and ensuring the effect of model accuracy
Pending Publication Date: 2022-01-14
BEIFANG UNIV OF NATITIES +1
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Problems solved by technology
Conventional electromechanical transient models of power systems are difficult to meet the above simulation requirements. Therefore, the existing simulation models all use more sophisticated full electromagnetic transient models
However, when the fine all-electromagnetic transient model is applied to the actual large power grid, it has poor convergence and low calculation efficiency, and it is extremely difficult to adjust the operation mode. There is even a broadband oscillation mode caused by the unstable interaction between the photovoltaic grid-connected system and the numerical calculation, and it is difficult to judge the obtained veracity of the conclusion
This model can only be applied to smaller, equivalently simplified power systems to study the mechanism of broadband oscillations
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[0019] Attached below figure 1 The overall structure diagram of the transient model of the photovoltaic power station further explains the present invention in detail: the transient model of the photovoltaic power station includes a photovoltaic power generation unit, an inverter and a filter circuit part, and an inverter control part, wherein the photovoltaic power generation unit includes a photovoltaic cell array, Maximum power tracking control (MPPT), DC boost chopper circuit; the inverter control part includes active power control model, reactive power control model and phase-locked loop model.
[0020] Rule 1: The power characteristics of the photovoltaic cell array, maximum power tracking control (MPPT), and DC boost chopper circuit of the volt generating unit are simulated by the power-voltage curve ( figure 2 ), the curve can be provided by the photovoltaic power station, or it can be fitted by actual measurement. In the calculation process, it can be arranged accor...
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The invention provides a photovoltaic power station transient model suitable for broadband oscillation analysis of a large power grid. According to the photovoltaic power station transient model, dominant influence factors of a broadband oscillation mode are obtained based on broadband oscillation mechanism analysis of a photovoltaic grid-connected system, secondary factors which are irrelevant or weakly relevant to the broadband oscillation mode are ignored, reasonable simplification is carried out on the basis of a full-electromagnetic transient model, and the photovoltaic power station transient model suitable for broadband oscillation analysis of the large power grid is established. The photovoltaic power station transient model simplifies the high-frequency dynamic process of a power electronic switch in a photovoltaic power generation system, fully considers dominant influence links and parameters of a broadband oscillation section of the power system for description, greatly reduces the oscillation problem generated by factor value calculation while improving model convergence and calculation efficiency and ensuring model accuracy, and therefore, the photovoltaic power station transient model can be suitable for broadband oscillation simulation analysis of the large power grid.
Description
technical field [0001] The invention belongs to the technical field of power system simulation and analysis, and in particular relates to a transient model of a photovoltaic power station suitable for broadband oscillation analysis of a large power grid. Background technique [0002] Photovoltaic power generation is one of the main forms of new energy power generation, and its development scale in the power system is getting bigger and bigger, and its proportion is getting higher and higher. With the grid-connected operation of large-scale photovoltaic power generation, under certain conditions, there is a divergent broadband oscillation mode in the grid-connected system of photovoltaic power plants, which poses severe challenges to the stable operation of the power system. By establishing an accurate broadband oscillation model of photovoltaic power plants, and simulating and analyzing the broadband oscillation problems of large-scale photovoltaic grid-connected power syste...
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Login to View More IPC IPC(8): H02J3/24H02J3/48H02J3/50H02J3/38
CPCH02J3/241H02J3/48H02J3/50H02J3/381H02J2300/26H02J2203/20Y02E10/56
Inventor 高峰刘浩芳张巍巍张白
Owner BEIFANG UNIV OF NATITIES