Power adjustment method for hybrid energy storage photovoltaic power station

A photovoltaic power station and power regulation technology, applied in photovoltaic power generation, current collectors, electric vehicles, etc., can solve problems such as restrictions on the promotion and application of photovoltaic power station technology, immature control methods, and the inability to give full play to the advantages of hybrid energy storage systems. Solve the poor quality of power supply, solve the difficulty of participating in scheduling, and accurately control the effect

Inactive Publication Date: 2013-02-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

At present, the control method of this kind of hybrid energy storage system in the operation process of photovoltaic power station is not mature, so that the advan

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  • Power adjustment method for hybrid energy storage photovoltaic power station
  • Power adjustment method for hybrid energy storage photovoltaic power station
  • Power adjustment method for hybrid energy storage photovoltaic power station

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Embodiment Construction

[0025] For the structure of the hybrid energy storage system in the photovoltaic power station described in the present invention, please refer to figure 1 , its composition includes supercapacitor bank, lithium battery pack, bidirectional DC / DC controller Ⅰ, bidirectional DC / DC controller Ⅱ, status monitoring and controller. The bidirectional DC / DC controllers I and II can be composed of multiple groups such as figure 2 The circuits shown are connected in parallel. The number of parallel groups of the bidirectional DC / DC controller I is determined by the capacity of the supercapacitor bank and the maximum transmission power of a single conversion circuit. The number of parallel groups of the bidirectional DC / DC controller II is determined by the lithium battery It is determined by the capacity of the group and the maximum transmission power of a single group conversion circuit. The low-voltage side of the bidirectional DC / DC controller I is connected to the supercapacitor b...

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Abstract

The invention discloses a power adjustment method for a hybrid energy storage photovoltaic power station. In the operating process of the photovoltaic power station, voltage of a direct current bus of the photovoltaic power station and voltages of a super capacitor group and a lithium battery group which are connected with the direct current bus respectively through two bidirectional direct current/direct current (DC/DC) controllers are detected in real time, active power output of a photovoltaic power supply is detected in real time, and meanwhile power output values of the super capacitor group and the lithium battery group for fulfilling an electric energy quality adjustment and control aim of the photovoltaic power station or finishing a scheduling task are quickly calculated; and running states of the two bidirectional DC/DC controllers are controlled according to a calculation result, and thus a charging process and a discharging process of the super capacitor group and the lithium battery group can be controlled. By the method, the advantage of high energy density of a lithium battery and the advantages of long circulation service life and high power density of a super capacitor are given a full play, the problems of low electric energy quality and difficulty in participation in power grid scheduling which are caused by grid-connected running of the photovoltaic power station can be solved; and popularization and application of the photovoltaic power station are facilitated.

Description

technical field [0001] The invention relates to a method for controlling the output active power of a photovoltaic power station when a hybrid energy storage system composed of a supercapacitor and a lithium iron phosphate battery is applied to a large-capacity photovoltaic power generation system, and belongs to the technical field of power generation. Background technique [0002] The megawatt-level photovoltaic power generation system is also called a photovoltaic power station. It is different from the existing small-capacity photovoltaic power generation system. The photovoltaic power station usually adopts a grid-connected operation mode. Due to the influence of natural factors such as light intensity and temperature, the active output of photovoltaic power sources in power stations has large fluctuations. Therefore, direct grid-connected operation will cause a series of problems, such as unstable grid operation, poor power supply quality, and participation in Difficul...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J7/35
CPCY02E10/566Y02E10/563Y02E10/56
Inventor 张建成鲍雪娜王银明张改利梁廷婷
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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