Local area power grid network for large-scale accessing large-scale photovoltaic power station to local area power grid at terminal of weak power grid and operation characteristic analysis method
A photovoltaic power station and local area power grid technology, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the constraints of local consumption capacity, peak shaving ability, poor system stability, and sustainable development of large-scale photovoltaic power stations and other issues to achieve the effect of improving utilization and reducing power loss
Inactive Publication Date: 2020-02-14
HUNAN VOCATIONAL COLLEGE OF RAILWAY TECH
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Problems solved by technology
[0003] The present invention aims at the problem that in the large-scale grid-connected operation of photovoltaic power plants, the photovoltaic power generation base is far away from the power load center, and the on-site consumption capacity, peak regulation capacity and system stability are poor, which leads to the problem that the sustainable development of large-scale photovoltaic power plants is restricted
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[0032] The present invention will be further described below in combination with specific embodiments.
[0033] A large-scale photovoltaic power station connected to a weak grid terminal local area grid grid and an analysis method for its operating characteristics:
[0034] In order to facilitate the construction of simulation models based on actual engineering conditions and analyze the characteristics of large-capacity photovoltaic power plants and their impact on grid connection, a Simulink simulation model based on modularization of megawatt-scale photovoltaic power plants was built, and the correctness of the working characteristics of each module was simulated verify.
[0035] Photovoltaic power plant electrical diagram such as figure 1 shown. The parameters of line 1 are R=0.181Ω, X=0.0942Ω; the parameters of line 2 are R=0.1267Ω, X=0.066Ω. Node 1 is the output terminal of the photovoltaic power station, node 2 is the grid connection point of the photovoltaic power s...
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The invention provides a local area power grid network for connecting a large-scale photovoltaic power station to the terminal of a weak power grid and an operation characteristic analysis method. Themethod includes the following steps: S1, establishing a photovoltaic power station simulation model; S2, analyzing the influence of grid connection of the photovoltaic power station on power qualitycharacteristics and grid voltage and generated harmonic current under the background of the weak power grid; S3, analyzing the influence of photovoltaic grid connection on system stability under the background of the weak power grid; S4, analyzing the influence of photovoltaic power station connection on the dynamic response of the system under the background of the weak power grid; and S5, analyzing the influence of randomicity of photovoltaic power generation output on the power grid characteristics. According to the invention, the photovoltaic power station is taken as a research target, and the operation characteristics of the photovoltaic power station are analyzed, thus further improving the utilization rate of new energy and reducing the electric energy loss.
Description
technical field [0001] The present invention relates to a method for analyzing a photovoltaic power station, and more specifically, to a method for analyzing the grid structure and operating characteristics of a local power grid at the end of a weak power grid when a large-scale photovoltaic power station is connected to the power grid. Background technique [0002] With the large-scale grid-connected operation of photovoltaic power stations in the "Three North Regions", and photovoltaic power generation bases are generally far away from the power load center, the regulatory power supply and demand-side response resources are scarce, making local consumption capacity, peak-shaving capacity and system stability capacity, etc. These problems have greatly restricted the sustainable development of large-scale photovoltaic power plants. Contents of the invention [0003] The invention aims at the problem that in the large-scale grid-connected operation of the photovoltaic power...
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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 褚衍廷陈忠林陈清化周湘杰张敏海余雨婷韩雪欧阳华邓松源
Owner HUNAN VOCATIONAL COLLEGE OF RAILWAY TECH