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Maximum power point tracking method, controller and photovoltaic energy storage system

A maximum power point and photovoltaic energy storage technology, which is applied in the field of maximum power point tracking method, controller and photovoltaic energy storage system, can solve the problems of high cost and low stability, so as to solve the cost, ensure stability and avoid busbar The effect of voltage collapse

Active Publication Date: 2017-02-22
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0005] The invention provides a maximum power point tracking method, a controller and a photovoltaic energy storage system to solve the problems of low stability and high cost in the prior art

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  • Maximum power point tracking method, controller and photovoltaic energy storage system
  • Maximum power point tracking method, controller and photovoltaic energy storage system
  • Maximum power point tracking method, controller and photovoltaic energy storage system

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Embodiment Construction

[0048] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] The invention provides a maximum power point tracking method to solve the problems of low stability and high cost in the prior art.

[0050] Specifically, the maximum power point tracking method is applied to the controller of the photovoltaic energy storage system, and the maximum power point tracking method can be found in image 3 ,include:

[0051] If there is a battery failure or no battery configuration, execute step S101;

[0052] S101. Control the unidirectional DC / DC converter to work in the bus voltage constant voltage source mode;

[0053] see figure 1 In the above photovoltaic energy storage system, when a battery fails or there is no battery configuration, the bus voltage is controlled by the unidirectional DC / DC...

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Abstract

The invention provides a maximum power point tracking method, controller and a photovoltaic energy storage system. If battery failure occurs or no battery is configured, a one-way DC / DC converter is controlled to work in a constant voltage source mode of a busbar voltage ; then whether a photovoltaic panel PV meets preset tracking adjustment conditions or not is judged; if the photovoltaic panel PV meets preset tracking adjustment conditions, the maximum current given value of an electric current loop of the one-way DC / DC converter is defined as a preset adjustment value; when whether the busbar voltage meets the rated conditions or not is judged, the maximum current given value of the electric current loop of the one-way DC / DC converter is controlled to increase to an original value from the preset adjustment value at a preset speed. According to the maximum power point tracking method, a discharge circuit is not required to be added, and the problem of cost increase is solved; at the same time, by changing an original MPPT, busbar voltage collapse is avoided, and the stability of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of maximum power point tracking, in particular to a maximum power point tracking method, a controller and a photovoltaic energy storage system. Background technique [0002] At present, MPPT (Maximum Power Point Tracking, maximum power point tracking) technology is already a core technology in the photovoltaic field; see figure 1 In the photovoltaic energy storage system shown, the energy input port of the photovoltaic energy storage inverter includes: photovoltaic panel PV, battery and power grid. Pursuing the maximization of PV utilization is usually one of the MPPT control objectives. [0003] The MPPT method of the existing photovoltaic energy storage inverter is basically consistent with the traditional photovoltaic inverter method. However, in addition to the grid-connected functions of traditional photovoltaic inverters, photovoltaic energy storage inverters also include functions such as battery ma...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/385Y02E10/56Y02E70/30
Inventor 金灵辉张凤岗刘宝其徐运燕肖永利
Owner SUNGROW POWER SUPPLY CO LTD
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