Photovoltaic power generation system with photovoltaic inverter and starting method of inverter
A photovoltaic power generation system and photovoltaic inverter technology, applied in photovoltaic power generation, electrical components, output power conversion devices, etc.
Active Publication Date: 2021-01-26
FONRICH NEW ENERGY TECH LTD
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The more realistic situation is that the power optimizer actively introduced to deal with the power loss of the power station will not be activated as soon as the photovoltaic module. First, it needs to confirm that the photovoltaic module is sufficient to provide the required working power. In addition, considering that the light intensity of different photovoltaic modules in the battery string is not the same, it is necessary to give the power optimizer a relatively reasonable output voltage quota, which brings how to adjust the application of the power optimizer. The confusion of starting the inverter due to the bus voltage
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[0056] Below in conjunction with each embodiment, the technical solution of the present invention is clearly and completely set forth, but described embodiment is only the embodiment that the present invention is used for describing description and not all embodiments, based on these embodiments, this invention The solutions obtained by those skilled in the art without creative work all belong to the protection scope of the present invention.
[0057] In the field of solar power generation using photovoltaic cells, shadow shading will cause mismatches between photovoltaic modules. The output parameters of photovoltaic modules are reflected in the close relationship between output voltage and output current and external factors such as light intensity and ambient temperature. , the uncertainty of external environmental factors causes the maximum output power and the voltage and current corresponding to the maximum power point to change with the change of external factors. Maximu...
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The invention relates to a photovoltaic power generation system with a photovoltaic inverter and a starting method for the inverter. The respective output voltages of the multi-stage voltage converters connected in series are superimposed to obtain the DC bus voltage, and the photovoltaic inverter inverts the DC bus voltage into AC power. When the DC bus voltage is lower than the starting voltage threshold, the inverter stops working, and the method of restarting the inverter after stopping includes: before the DC bus voltage reaches the starting voltage threshold, at least a part of the voltage converters are turned on synchronously or asynchronously, and the turned on The voltage converter boosts the received input voltage and forcibly limits the output voltage generated by itself within the preset swing range to continue to oscillate. The output voltage of the turned-on voltage converter approaches and exceeds in a synchronous or asynchronous superposition Start-up voltage threshold to start the inverter to complete the start-up procedure.
Description
technical field [0001] The present invention mainly relates to the field of solar power generation. More precisely, it relates to a scheme for adaptively starting or stopping the work of the inverter in a power generation system containing photovoltaic modules and photovoltaic inverters, so as to ensure that when the system faces daytime Under the natural phenomenon of night and night, the photovoltaic inverter can adaptively start or shut down by itself. Background technique [0002] The power optimizer balances output parameters and output parameters locally, and photovoltaic modules no longer require centralized photovoltaic inverters to perform benefit optimization. Regarding how the power optimizer balances input and output: it is mainly to find the output voltage and output current calculation of photovoltaic modules The maximum power point obtained, the power optimizer also sets its own output voltage and output current so that there is no direct relationship with the...
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IPC IPC(8): H02M1/36H02J3/38
CPCY02E10/56
Inventor 张永胡晓磊
Owner FONRICH NEW ENERGY TECH LTD