Starting control method of photovoltaic inverter and photovoltaic inverter system
A photovoltaic inverter and inverter technology, applied in the direction of photovoltaic power generation, conversion of irreversible DC power input to AC power output, output power conversion device, etc.
Active Publication Date: 2021-04-30
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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[0007] Based on this, it is necessary to solve the problem that the start-up control method of the traditional photovoltaic inverter cannot accurately find the start-up timing that can make the photovoltaic inverter circuit run stably, the relay will not repeatedly pull on and off, and will not waste excess energy. Provide a start-up control method for a photovoltaic inverter and a photovoltaic inverter system with a start-up control function for a photovoltaic inverter
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[0040] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0041] The present application provides a start-up control method of a photovoltaic inverter. It should be noted that the start-up control method for photovoltaic inverters provided in this application is applicable to photovoltaic inverters of any type and brand.
[0042] In addition, the start-up control method of the photovoltaic inverter provided in this application does not limit its execution subject. Optionally, the execution subject of the photovoltaic inverter start-up control method provided in this application may be a control unit 220 in a photovoltaic inverte...
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The invention relates to a starting control method of a photovoltaic inverter and a photovoltaic inverter system. By monitoring the numerical value of the output voltage of a photovoltaic module, not only the most basic starting condition capable of satisfying an inverter circuit can be effectively found out, but also a DC / DC converter can switch to the output voltage of the photovoltaic module in a boost mode. By monitoring the time consumed by changing a direct current bus voltage value from a first preset voltage value to a second preset voltage value, and under the condition that the time is less than the time consumed by charging the DC bus via the photovoltaic module according to the minimum output power so as to change the direct current bus from the first preset voltage value to the second preset voltage value, a relay is controlled to check by itself and close, and a DC / AC converter is started so as to start the whole photovoltaic inverter. According to the starting control method, no external hardware support is needed, not only the inverter circuit of the photovoltaic inverter can stably operate, but also the relay cannot check by itself repeatedly, and no noise and no energy waste are generated in the starting process.
Description
technical field [0001] The present application relates to the technical field of photovoltaic inverters, in particular to a photovoltaic inverter start-up control method and a photovoltaic inverter system with a photovoltaic inverter start-up control function. Background technique [0002] For conventional photovoltaic inverters, during the start-up process, the photovoltaic modules are generally allowed to charge the DC bus first. After the voltage value of the DC bus reaches the preset voltage value, the detection of the relay is carried out, and then the relay is closed to complete the start-up of the photovoltaic inverter. [0003] However, in this process, if the output power of the photovoltaic module is insufficient, the voltage value of the DC bus will drop too much during the self-test process of the relay, and the controller will determine that the photovoltaic inverter is working abnormally, thus interrupting The start-up process of the PV inverter. Therefore, i...
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Login to View More IPC IPC(8): H02M1/36H02M7/42H02J3/38
CPCH02J3/381H02M1/36H02M7/42H02J2300/26Y02E10/56
Inventor 魏琪康郭华为施鑫淼刘超厚李新富
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD