MPPT photovoltaic inverter control system and control method thereof

Abstract

The invention discloses an MPPT photovoltaic inverter control system. A power inverter unit is connected to a solar cell panel, a main processing unit is connected to the power inverter unit, and the main processing unit is used for processing data through an MPPT algorithm and giving out a control instruction. A real-time clock chip unit and a signal real-time detection unit are connected to the main processing unit. An X-axis motor driving unit is connected between the main processing unit and an X-axis motor and is used for executing the control instruction of the main processing unit to drive the X-axis motor to rotate. A Y-axis motor driving unit is connected between the main processing unit and a Y-axis motor and is used for executing the control instruction of the main processing unit to drive the Y-axis motor to rotate. Tracking to the maximum power to photovoltaic solar energy of the control system achieves the purposes of real time, comprehensiveness, quickness and stability, so that the real-time application efficiency of the solar cell panel is improved, and the advantages such as high efficiency and energy saving are achieved.

Description

technical field [0001] The present invention relates to a photovoltaic inverter, in particular to a maximum power point tracking (Maximum Power Point Tracking, MPPT) photovoltaic inverter control system and control method. Background technique [0002] With the increasingly tense energy situation, solar energy, as a clean and renewable energy source, has attracted more and more attention. Therefore, more and more photovoltaic products are designed and produced, and the main technical bottleneck of photovoltaic products lies in how to improve solar photovoltaic power generation. If the efficiency problem is not solved, the application cost of the product will become a key factor limiting its wide application. As an energy-saving motor speed control device, the frequency converter has significant technical advantages in the application of three-phase asynchronous motor as a load in the way of combining it with photovoltaic energy. [0003] In the existing technology, the comb...

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Problems solved by technology

[0003] In the existing technology, the combination of photovoltaic energy utilization and inverter products is often rough, which fails to fully improve the efficiency of the whole system, and the utilization rate of solar panels is not high, and some directly use the constant voltage method to track system settings The voltage value of the maximum output power of the solar panel, this method is limited by the actual environment, as the light intensity and the temperature of the panel change, the voltage value of the maximum output power will shift, and the real maximum power cannot be tracked, there will be Larger actual deviation; there are also other more complex methods such as admittance increment algorithm to improve application efficiency, but the improvement effect obtained by this method alone is not obvious, and it takes a long time to gradually adjust and track the operation, and the response is slow

[0004] Therefore, the existing photovoltaic inverter control system has defects such as poor accuracy of tracking the maximum power, slow response, and long time consumption.

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