A control method and device for a DC grid-connected system of a photovoltaic power station
A technology of photovoltaic power station and control method, which is applied in the direction of circuit devices, photovoltaic power generation, emergency protection circuit devices, etc., can solve the problems of inflexible system operation and increased transmission line loss, and achieve the effect of ensuring flexibility and maintaining high-efficiency operation
Active Publication Date: 2021-10-01
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
However, the operation of the system is not flexible enough, and the proposed step-down operation strategy still cannot make all the generating units work at the maximum power point, and increases the transmission line loss
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[0124] The present invention will be described in further detail below in conjunction with the accompanying drawings. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0125] Specific implementation plan:
[0126] 1. System topology
[0127] The topology of matrix interconnected DC grid-connected system is as follows: figure 1 shown. Photovoltaic power generation unit ij (0<i≤m, 0<j≤n) represen...
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The invention provides a control method and device for a DC grid-connected system of a photovoltaic power station. The method includes: calculating the value of the output voltage of the photovoltaic power generation unit; judging whether the photovoltaic power generation unit works normally according to the range of the value of the output voltage of the photovoltaic power generation unit; According to whether the photovoltaic power generation unit works normally, the control strategy of the photovoltaic power generation unit is determined. The technical solution provided by the invention can ensure that the DC collecting line is not overloaded, so that the photovoltaic power station can continue to maintain high-efficiency operation under the condition of uneven illumination intensity or failure of the power generation unit.
Description
technical field [0001] The invention belongs to the field of photovoltaic power station grid-connected systems, and in particular relates to a control method and device for a photovoltaic power station DC grid-connected system. Background technique [0002] With the over-exploitation of fossil energy and the daily concern of air pollution, solar energy, as a clean and renewable energy, has many advantages. The large-scale photovoltaic power plants planned and constructed in my country are mainly concentrated in eight western provinces and regions. The power grids in these areas are relatively weak, the load level is low, and the electric energy is facing the problem of large-scale and long-distance transmission. The current large-scale grid-connected photovoltaic power plants are faced with low inverter efficiency when there is insufficient sunlight, the DC busbar provides a zero-sequence circulation path between multiple inverters, and the long-distance AC transmission conn...
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IPC IPC(8): H02J3/38H02H7/26
CPCH02J3/385H02H7/262Y02E10/56
Inventor 王志冰李琰迟永宁汤海雁魏林君
Owner CHINA ELECTRIC POWER RES INST