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A method of photovoltaic grid-connected inversion

An inverter and photovoltaic technology, which is applied in the direction of photovoltaic power generation, adjustment of electric variables, irreversible DC power input conversion to AC power output, etc., can solve the problems of increasing system heat generation, low reliability, waste of solar energy resources, etc., and achieve reduction Effects of Harmonic Pollution, Safety and Improvement of Overload Capability

Active Publication Date: 2005-09-21
SUNGROW POWER SUPPLY CO LTD
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AI Technical Summary

Problems solved by technology

[0007] 1. Low efficiency: Generally, the system efficiency at rated power is below 90%. On the one hand, precious solar energy resources are wasted, on the other hand, the heating of the system is increased, and the difficulty and cost of heat dissipation are increased.
[0008] 2. Low reliability: Many of the current domestic technologies use high-frequency transformers, the system topology is complex, the ability to resist power grid impact is weak, and failures are prone to occur
[0009] 3. Not suitable for outdoor use: due to the low efficiency of the system, air cooling must be used for heat dissipation, so it can only be installed indoors
makes the scope of application very limited
[0010] Mainly import foreign technology and equipment, the technology is relatively backward, and there is no independent intellectual property rights, and the production cost is relatively high

Method used

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Embodiment Construction

[0025] see figure 1 , 2 .

[0026] The main circuit adopts PWM DC / AC bridge inverter topology, and the isolation transformer is used to isolate the voltage and voltage level conversion; the main function of the reactor La is to filter and store the reactive component of the circuit to realize PWM current control; DC The filter is the second harmonic current filtering branch on the DC side; the AC filter is the LC filter link at the end of the grid side, which makes the sine wave grid-connected current smoother; IA, IB, and ID are high-precision Hall current sensors, which are DSP Provides a current sampling signal. The power module of the charging and discharging main circuit adopts the IPM module, which integrates drive and protection and has high reliability. The discharge current obtained by the ID and the terminal voltage of the solar cell array are converted by A / D and sent to the software protection unit to realize the overvoltage protection of the solar cell array an...

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Abstract

This invention discloses a inversion method for photovoltaic parallel in network, which uses digital signal processor (DSP) as core, the power factor is one and having small harmonic pollution to electric network, said method is a high efficiency and high reliability inversion method.

Description

technical field [0001] The invention relates to the technical field of new energy and high efficiency and energy saving, in particular to a photovoltaic grid-connected inverter device. technical background [0002] In photovoltaic applications of solar energy, photovoltaic grid-tied (Grid-connected) power generation is an important development trend of solar photovoltaic applications and has become the main form of photovoltaic applications. Due to the many advantages of solar photovoltaic power generation, its research and development, industrialized manufacturing technology and market development have become the main focus of fierce competition among countries in the world, especially developed countries. At present, photovoltaic grid-connected power generation systems have been widely used in Japan, Europe and the United States, and the technology and equipment are relatively mature. [0003] The core component of the photovoltaic grid-connected power generation system i...

Claims

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Application Information

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IPC IPC(8): G05F1/12H02H3/08
CPCY02E10/56
Inventor 曹仁贤赵为屠运武
Owner SUNGROW POWER SUPPLY CO LTD
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