Control method and system for photovoltaic cell working at maximum power point
A maximum power point, photovoltaic cell technology, applied in the control/regulation system, photovoltaic power generation, adjustment of electrical variables, etc., can solve the problems of inverter undervoltage alarm, system failure, etc.
Inactive Publication Date: 2021-06-22
BEIJING NEGO AUTOMATION TECH
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The working point moves rapidly to point C, causing the inverter to alarm for undervoltage and the system to fail
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[0035] In order to make the technical solutions and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] combine Figure 4 and Figure 5 , the first embodiment of the present invention provides a control method for photovoltaic cells operating at the maximum power point, which is applied to an off-grid control system powered solely by photovoltaic cell panels, including the following steps:
[0037] Using the maximum power voltage Mppt_Ref of the photovoltaic panel as the reference value of the inverter DC bus voltage and the actual DC bus voltage value Udc_Feed obtained from the inverter's DC voltage sensor to make a difference to obtain the first calculation result;
[0038] adjusting the first calculation result by using the first PI regulator, and outputting the second calculation result;
[0039] Using the second calculation resul...
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The embodiment of the invention discloses a control method and system for a photovoltaic cell to work at a maximum power point, and the method comprises the following steps: taking the maximum power voltage of a photovoltaic cell panel as a reference value of the DC bus voltage of an inverter, and obtaining a difference value from the reference value and an actual DC bus voltage value obtained from a DC voltage sensor of the inverter; obtaining a first calculation result; adjusting the first calculation result by using a first PI adjuster, and outputting a second calculation result; obtaining a third calculation result by taking the second calculation result as an inverter voltage amplitude reference value and making a difference between the second calculation result and an inverter voltage actual amplitude obtained from an alternating current voltage sensor of the inverter; adjusting the third calculation result by using a second PI regulator, and outputting an inverter voltage reference amplitude; multiplying the inverter voltage reference amplitude by a sin function to obtain a sine wave; and outputting a result obtained after the sine wave is subjected to spwm modulation to an inverter.
Description
technical field [0001] The invention relates to the field of inverters for photovoltaic heat storage systems, and more specifically, to a control method and system for photovoltaic cells to work at the maximum power point. Background technique [0002] MPPT, the abbreviation of Maximum Power Point Tracking, is "Maximum Power Point Tracking" in Chinese, which means that the inverter adjusts the output power of the photovoltaic array according to the characteristics of different ambient temperatures and light intensity, so that the photovoltaic array always outputs the maximum power. [0003] In the existing photovoltaic off-grid inverter system control, photovoltaic panels plus battery energy storage are generally used as the system control scheme. When the sunlight is sufficient, the photovoltaic cells are given priority to provide load power and charge the energy storage cells. When the light is weak, the load power is jointly provided by the photovoltaic cell and the ene...
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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 王亚非张晓宁霍箭金成日贾利民任利军
Owner BEIJING NEGO AUTOMATION TECH