Optimized MPPT algorithm

An algorithm and power calculation technology, applied in the direction of instruments, control/regulation systems, and electrical variables, etc., can solve the problems of tracking delay, poor control performance, and reduce MPPT efficiency, and achieve the effect of high tracking efficiency.

Active Publication Date: 2016-01-20
BEIJING JINGYI RENEWABLE ENERGY ENG
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Problems solved by technology

[0016] However, due to the influence of external environment and internal control, photovoltaic inverters in practical applications have phenomena such as tracking delay and control overshoot, so that the DC voltage cannot track the DC command voltage in real time, and the calculated power change detP is inaccurate, resulting in MPPT malfunction, thereby reducing MPPT efficiency
Especially in the case of light load of the inverter, the control performance is worse

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specific example

[0047] The algorithm of the present invention compares the MPPT tracking efficiency before and after optimization under the conditions of dynamic, static, light and heavy load respectively. Specific examples are as follows:

[0048] The simulated PV source in the example is the IVS series solar cell I-V simulator, the maximum output power of a single machine is 630KW, the IGBT rectification method is adopted, the active PFC control is adopted, and the efficiency is above 95%.

[0049] In terms of the core control of the I-V simulation, there are core software and hardware control strategies to ensure the accuracy and dynamic characteristics of the actual output of the I-V simulator. It can simulate the output characteristics of the I-V curve of different materials (polycrystalline, single crystal, thin film, etc.) under different irradiance, temperature and cloud cover.

[0050] The inverter in the example is the JYNB-500KHE of Jingyi Green Energy Company, with a rated output power ...

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Abstract

The invention relates to an optimized MPPT algorithm. Power calculation is performed by using direct-current command voltages Uref (k-1) and Uref (k) to obtain P (k), P (k + 0.5) and P (k + 1). The calculation formulas of the P (k), the P (k + 0.5) and the P (k + 1) are: P = Uref (k) (k-1) * (I) (k), P (k + 0.5) = Uref * I (k) (k + 0.5), and P (k + 1) = Uref (k) * I (k + 1)). By means of the optimized MPPT algorithm, the phenomenon that direct-current command voltages cannot be tracked in real time due to direct-current voltages and accordingly MPPT misoperation is caused is avoided. The optimized MPPT algorithm has good dynamic and static tracking performance and can keep high tracking efficiency in the case of light load or weak light illumination.

Description

Technical field [0001] The invention relates to the field of photovoltaic inverter control, in particular to an optimized MPPT algorithm. Background technique [0002] In recent years, with the rapid development of the photovoltaic industry and the substantial increase in the installed capacity of the photovoltaic market, people have put forward higher requirements for various performance indicators of photovoltaic power generation systems. Among them, improving the maximum power tracking (MPPT) efficiency of photovoltaic inverters has always been a goal pursued by everyone. [0003] A variety of MPPT control methods have been proposed at home and abroad, such as the commonly used constant pressure method, disturbance increment method, admittance increment method[1][2], etc. [0004] The article [3] proposes a dP-P&O method, under certain conditions, by distinguishing the power change caused by MPPT control from the power change caused by illumination change, to determine the correc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
Inventor 颜云岭
Owner BEIJING JINGYI RENEWABLE ENERGY ENG
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