Maximum power tracking method based on direct-current bus voltage control
A technology of DC bus voltage and maximum power tracking, which is applied in the direction of control/regulation system, regulation of electrical variables, instruments, etc., can solve problems such as inverter DC bus voltage collapse, loss of normal operation, and influence on inverter output efficiency. Achieve the effects of avoiding bus voltage collapse, high efficiency and stable output, and speeding up
Inactive Publication Date: 2014-06-25
SHANGHAI ELECTRICGROUP CORP
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[0004] Therefore, the change of the input power curve of the PV array requires the inverter to respond quickly and keep running at the maximum power point at any time, otherwise the output efficiency of the inverter will be affected, and even the DC bus voltage of the inverter will collapse due to the wrong calculation of the power point , completely loses the ability to operate normally
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[0020] The present invention will be further described below in conjunction with accompanying drawing.
[0021] see figure 1 , is the structure diagram of the main circuit of the high-power photovoltaic inverter, including the DC input circuit, the three-phase full-bridge IGBT main power circuit, the LC filter circuit and the AC contactor, etc. based on figure 1 The main circuit structure diagram of the inverter, the present invention proposes a maximum power tracking method based on DC bus voltage control, as follows:
[0022] see figure 2 , the maximum power tracking method of the present invention, comprises the steps:
[0023] Step 1, real-time detection of inverter DC bus voltage U dc and DC input current I dc , so as to calculate the real-time input power P dc ;
[0024] Step 2, for the DC bus voltage U dc The given value U dc_ref perturbation, the U dc and U dc_ref The difference is adjusted by the PI regulator as the given input value I of the inverter curr...
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The invention discloses a maximum power tracking method based on direct-current bus voltage control. The method includes the steps that a direct-current bus voltage Udc and input direct-current Idc of an inverter are detected in real time, and real-time input power Pdc is obtained through calculation; a given value Udc_ref of the direct-current bus voltage Udc is disturbed, and the differential value between the Udc and the Udc_ref is adjusted through a PI adjustor and then serves as a set input value Iref (t) of inverter current control; the inverter performs PI adjustment on output currents according to the set input value Iref (t), so that an output active current value Id is equal to Iref (t); change conditions of the input power Pdc of the inverter are calculated after the disturbance, so that a corresponding direct-current bus voltage value when the input power of the inverter is maximum is obtained. The maximum power tracking method is used for tracking the maximum power of the high-power photovoltaic inverter, under the condition that the input curvature of a PV array is changed, a new maximum power point can be found more rapidly and accurately through the inverter, and efficient and stable output is kept.
Description
technical field [0001] The invention relates to the field of photovoltaic inverter control, in particular to a maximum power tracking method based on DC bus voltage control. Background technique [0002] In high-power photovoltaic inverter applications, the power output of the inverter must meet the power curve of the PV array. The DC input of the voltage inverter is mostly directly input by the PV array, and there is no DC / DC part. In order for the PV inverter to efficiently and stably output power as close as possible to the maximum output capacity of the PV array during normal operation, it is necessary The output of the inverter is controlled by a suitable maximum power tracking method. [0003] However, due to frequent changes in the input of the PV array, MPPT not only needs to be able to find the maximum output point of the inverter under stable operation, but also needs to respond to changes in the input of the PV array in a timely manner. The main reasons for the ...
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Inventor 杨舟杨滔李春杨文斌马成斌董祖毅
Owner SHANGHAI ELECTRICGROUP CORP