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Analogy control circuit capable of achieving photovoltaic cell maximum power point tracing

A technology of maximum power point and photovoltaic cells, applied in photovoltaic power generation, control/regulation systems, and regulation of electrical variables, etc., can solve the problems of slow real-time performance, poor precision and efficiency of digital control

Inactive Publication Date: 2013-12-11
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some shortcomings in digital control: the real-time performance of digital control is slower than that of analog circuits, and the accuracy and efficiency are also slightly worse.

Method used

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  • Analogy control circuit capable of achieving photovoltaic cell maximum power point tracing
  • Analogy control circuit capable of achieving photovoltaic cell maximum power point tracing
  • Analogy control circuit capable of achieving photovoltaic cell maximum power point tracing

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with drawings and embodiments.

[0013] The specific implementation of the present invention adopts the Buck DC-DC converter as the main circuit to realize the maximum power point tracking of the photovoltaic battery, and is used for charging the 48V lead-acid battery at the load end, such as figure 1 As shown in the figure: D pv For anti-reverse charging diodes, C pv is the energy storage capacitor, Q 1 for the power tube, D 1 is the freewheeling diode, L 1 for inductance, C o is the output filter capacitor, R LD is the load resistance, I pv is the photovoltaic cell current, V pv is the photovoltaic cell voltage, I o is the load current, V o is the output voltage. The power-current characteristics of photovoltaic cells such as figure 2 As shown in the figure: P PV The output power of the photovoltaic cell, I PV The output current of the photovoltaic cell, P m is the maxim...

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Abstract

The invention discloses an analogy control circuit capable of achieving photovoltaic cell maximum power point tracing, and belongs to the technical field of power electronic application. The analogy control circuit comprises an analogy multiplier, two differentiators, two comparators, an XNOR and a D trigger. According to the analogy control circuit, based on a perturbation and observation method, the change rate of output currents of a photovoltaic cell and the change rate of the output power of the photovoltaic cell are compared, the simple and practical analogy control circuit is used, the output currents and voltages of the photovoltaic cell only need to be sampled, charging-discharging of output end capacitance of the photovoltaic cell is controlled based on on / off, the output currents (or voltages) of the photovoltaic cell are made to achieve maximum power point currents (or voltages), and the maximum power point tracing in the real sense is achieved. The analogy control circuit capable of achieving photovoltaic cell maximum power point tracing is applied to a solar photovoltaic power generating system, and has good engineering application value.

Description

technical field [0001] The invention relates to an analog control circuit for realizing maximum power point tracking of photovoltaic cells, belonging to the technical field of power electronics applications. Background technique [0002] The output characteristics of photovoltaic cells have strong nonlinear characteristics and are changed by changes in the intensity of sunlight and ambient temperature. Under certain sunlight intensity and ambient temperature, photovoltaic cells can have different output currents, but only at a specific output current can the corresponding output power reach the maximum value, and photovoltaic cells work at the maximum power point at this time. Therefore, in a solar photovoltaic power generation system, in order to improve the power conversion capability of photovoltaic cells, it is necessary to adjust the operating point of photovoltaic cells in real time so that they always work near the maximum power point, that is, to achieve maximum powe...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 廖志凌崔晓晨张春龙
Owner JIANGSU UNIV
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