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Control method of grid-connected inverter of large-scale grid-connected photovoltaic power station

A photovoltaic power station and control method technology, applied in the field of control, can solve problems such as failure to meet system operation requirements, failure to meet grid scheduling requirements, static errors, etc.

Inactive Publication Date: 2011-07-27
NORTHEAST DIANLI UNIVERSITY +1
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  • Abstract
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Problems solved by technology

[0003] The existing control methods for grid-connected inverters of large-scale photovoltaic power plants, on the one hand, the selection of reference values ​​cannot meet the requirements of power grid dispatching, on the other hand, the control strategy used by them has a slow dynamic response, and secondly, there are static errors, which cannot meet the actual requirements of the system. running requirements

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  • Control method of grid-connected inverter of large-scale grid-connected photovoltaic power station
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  • Control method of grid-connected inverter of large-scale grid-connected photovoltaic power station

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[0072] Specific examples: for example figure 1 The simple grid-connected system of a large-scale photovoltaic power station shown in the figure, its grid-connected inverter control structure is as follows: figure 2 As shown, the rated capacity of the inverter is 1.0MW, the rated voltage of the AC side is 0.5kV, the rated voltage of the DC side is 700V, the switching frequency is 4000HZ, the equivalent inductance of the filter reactor is L=2.5mH, and the equivalent resistance of the control system is R= 0.06Ω, inner loop proportional adjustment parameter k 1，2 =7000, outer ring proportional adjustment parameter k 1p，2p =1.5, integral adjustment parameter T 1i，2i =0.005, the transformation ratio of transformer Tr1 is 0.5 / 35kV, the transformation ratio of Tr2 is 35 / 110kV, the line resistance R L =3.5Ω, line reactance X L =4.25Ω, static load 0.36MVA, dynamic load 0.37MVA. image 3 , Figure 4 Shown is the current and power dynamic response of the grid-connected inverter of ...

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Abstract

The invention relates to a control method of a grid-connected inverter of a large-scale grid-connected photovoltaic power station. The control method is characterized by comprising the following steps: establishing a grid-connected inverter model under a d-q coordinate system; realizing active and passive power decoupling control by adopting a state feedback exact linearization nonlinearity control strategy; and eliminating static control errors generated by inaccurate system parameter estimation by utilizing cascaded PI (Proportion Integration) adjustment. By utilizing the method of the invention, modeling and grid-connected dynamic analysis are carried out on the grid-connected inverter of the large-scale grid-connected photovoltaic power station to fully reflect the validity of the control method under the conditions of considering different power factors, intensities of illumination, faults, and the like. Compared with a traditional control method, the control method disclosed by the invention is scientific, simple to adjust parameters, can eliminate static errors and has the advantages of favorable dynamic characteristics, stronger robustness, strong suitability, high practical application values, and the like.

Description

technical field [0001] The invention relates to the technical field of control, and relates to a control method for a grid-connected inverter of a large-scale grid-connected photovoltaic power station. Background technique [0002] Large-scale grid-connected photovoltaic power plants are a promising way to utilize solar energy, and will occupy a very important position in the future global energy structure. The large-scale grid-connected photovoltaic power plant model and its interaction with the power grid have become a major issue of common concern in the field of new energy development and power system operation in the world today. The grid-connected inverter is the core part of the model, and the research on its control method has far-reaching significance for realizing the grid-connected power station and the safe and stable operation of the system. [0003] The existing control methods for grid-connected inverters of large-scale photovoltaic power plants, on the one h...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 蔡国伟孔令国邢亮李振新章昊刘铖
Owner NORTHEAST DIANLI UNIVERSITY
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