MPPT (maximum power point tracking) control device and MPPT control method of photovoltaic inverter

A photovoltaic inverter and control method technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as increasing the time to find MPP points, left and right oscillations of photovoltaic inverters, and reducing the efficiency of solar cells, etc., to achieve The effect of fast processing, simple MPPT control device, and stable control

Inactive Publication Date: 2013-04-24
SHENZHEN JINGFUYUAN TECH
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  • Claims
  • Application Information

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Problems solved by technology

The commonly used MPPT control method is the disturbance method (such as the voltage disturbance method). Although the disturbance method is very convenient to use, it also has two disadvantages: one is that it will cause the photovoltaic inverter to oscillate around the MPP point, resulting in energy los

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  • MPPT (maximum power point tracking) control device and MPPT control method of photovoltaic inverter
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  • MPPT (maximum power point tracking) control device and MPPT control method of photovoltaic inverter

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Firstly, the energy flow in the single-phase photovoltaic inverter is analyzed. Ignoring various losses (including inverter bridge switching loss, passive device loss, line loss and secondary power supply, etc.), the power balance relationship of the system is as follows figure 1 and figure 2 As shown, the arrow indicates the positive direction of the specified power. In the figure, Ppv is the output power of the photovoltaic cell; Pc is the power of the DC bus capacitor; uDC is the DC bus voltage, that is, the output voltage of the solar panel; iC is the current on the DC bus capacitor; uL is the voltage on the AC filter inductor ; uG is the AC grid voltage; iG is the AC output current; C is the DC bus capacitance; L is the AC filter inductance. According to the power balance relationship, there are

[0028] P ...

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Abstract

The invention discloses an MPPT (maximum power point tracking) control device and an MPPT control method of a photovoltaic inverter. The MPPT control method includes the steps: A, sampling direct-current voltage Ux and direct current Ix of a direct-current side of the photovoltaic inverter, and computing input power Px of the direct-current side of the photovoltaic inverter; B, judging whether the direct-current voltage Ux is not larger than a voltage minimal value U1 or not, if so, updating the voltage minimal value U1 and corresponding input power P1 and switching to D, and otherwise switching to C; C, judging whether the direct-current voltage Ux is not smaller than a voltage maximum value U2 or not, if so, updating he voltage maximum value U2 and corresponding input power P2 and switching to the D, and otherwise switching to E; D, computing a voltage result value U; and E, sending PWM (pulse-width modulation) signals of switches in the photovoltaic inverter according to the voltage result value U. The MPPT control method is simple in sampling MPPT algorithm, easy to implement, rapid in processing, stable in control and capable of improving use efficiency of solar cells.

Description

technical field [0001] The invention relates to MPPT control technology, in particular to an MPPT control device and method for a photovoltaic inverter based on voltage fluctuations. Background technique [0002] With the development of the economy and the progress of society, the demand for energy is increasing day by day, and the supply of conventional energy (such as coal, oil, water power, natural gas, etc.) is becoming more and more in short supply. Therefore, the development of new energy is an inevitable trend in today's world, and solar cells are One of the main new energy sources. However, the current low conversion efficiency of photovoltaic cells is the bottleneck for the large-scale application of solar energy. How to maximize the use of the energy generated by solar power generation is an important direction of photovoltaic research. [0003] The output characteristics of photovoltaic arrays have nonlinear characteristics, and their output voltage and current ...

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 王刚陈恒留
Owner SHENZHEN JINGFUYUAN TECH
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