Method for flexible power generation based on distributed photovoltaic power station area protection system

Abstract

The invention discloses a method for performing flexible power generation based on a distributed photovoltaic power station regional protection system. The distributed photovoltaic power station regional protection system is connected between photovoltaic power stations and a transformer, and is characterized by comprising photovoltaic acquisition / control devices which communicate by means of electric carrier waves, a low-voltage comprehensive distribution box and a central control device, wherein the photovoltaic acquisition / control devices are connected with inverters of the photovoltaic power stations and used for acquiring parameters of the corresponding inverters, transmitting the acquired parameters to the central control device, receiving a command of the central control device and controlling the current generation power of the corresponding inverters; and the low-voltage comprehensive distribution box is connected with the transformer and used for acquiring operating parameters of transformer and transmitting the acquired parameters to the central control device. In the technical scheme, the current power of the transformer and the grid-connected photovoltaic power stations is monitored in real time through the distributed photovoltaic power station regional protection system, whether the transformer stays at a full capacity state or not, the photovoltaic power stations are enabled to reach a full capacity state as far as possible through upward adjusting the current generation power of the grid-connected photovoltaic power stations if the transformer does not stay at the full capacity state, the transformer is enabled to reach the maximum consumption capacity at most of the time, and the power generation efficiency and the power generation capacity of the transformer are improved.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and relates to a distributed photovoltaic power station, in particular to a distributed photovoltaic power station area protection system and a control method for flexible power generation. Background technique [0002] With the depletion of traditional fossil energy such as coal and oil, and the increasingly serious environmental pollution, the development and application of new energy represented by photovoltaic power generation has become the industry direction guided by the government. At present, the state encourages all kinds of power users to build distributed photovoltaic power generation systems in accordance with the method of "spontaneous self-use, surplus to the grid, and grid regulation". [0003] Due to the limited capacity of transformers, the grid-connected generation power is limited. At present, in most areas, the number of photovoltaic power stations that can be ins...

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Problems solved by technology

[0003] Due to the limited capacity of transformers, the grid-connected generation power is limited. At present, in most areas, the number of photovoltaic power stations that can be installed in this area is determined based on the ratio of transformer capacity to the full capacity of photovoltaic power stations. However, in practical applications, photovoltaic power stations in operation There are often off-grid situations, and most of the lighting time cannot be fully emitted, which leads to the inability of the transformer to reach the maximum consumption capacity most of the time, which greatly reduces the power generation efficiency and the power generation capacity of the transformer

[0004] As the number of distributed photovoltaic power generation in a region (such as a village) increases, its power generation exceeds the capacity limit of the upper-level transformer or the grid-connected voltage deviation is too large. In this case, all photovoltaic power plants in the region should be disconnected immediately. network, resulting in the phenomenon of large-scale abandoned light

Due to the relative dispersal of distributed photovoltaic power plants, the lack of effective comprehensive management and control methods has always been an important problem that is difficult to solve, which determines whether distributed photovoltaic power plants can develop in a reasonable and orderly manner.

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