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Inverter optimal output control method and device

A technology of output control and inverter, applied in the field of photovoltaic power generation, can solve the problem that the power quality cannot be optimal, and achieve the effect of optimal output performance

Active Publication Date: 2019-12-13
JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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  • Application Information

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Problems solved by technology

Due to the fixed parameters in the PI control loop, limited by the high impedance of the grid and the quality of the grid, the power quality of the inverter output cannot be optimal.

Method used

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  • Inverter optimal output control method and device
  • Inverter optimal output control method and device
  • Inverter optimal output control method and device

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Embodiment 1

[0022] Embodiment 1: An inverter optimal output control method for controlling the output of the inverter by adjusting the parameters of the output control loop, including a preparation stage and an implementation stage.

[0023] In the preparation stage, the inverter power of the inverter is divided into multiple power levels according to the power node value P[k] in advance, and the output control loop parameter adjustment limit and adjustment step size corresponding to each power level are preset. The power node value P[k] is used to divide power levels, so it can also be called level power P[k]. In this embodiment, four power node values ​​P[k] are set, namely P[1], P[2], P[3], P[4], and P[1]<P[2]< P[3]<P[4], the inverter power is divided into 5 power levels. If the inverter power P<P[1] of the inverter belongs to the first power level, if P[1]≤inverter power of the inverter P<P[2] then it belongs to the second power level, if If P[2]≤the inverter power of the inverter P...

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Abstract

The invention relates to an inverter optimal output control method, which comprises the following steps of 1, calculating the current inversion power of the inverter, 2, judging the power level to which the current inversion power of the inverter belongs and acquiring the corresponding output control loop parameter adjustment limit value and the adjustment step length, 3, calculating the total harmonic current value of the output signal of the inverter before adjustment, 4, adjusting the parameters of the output control loop according to the adjustment step length and the adjustment direction,5, calculating the total harmonic current value of the output signal of the inverter after adjustment, and 6, judging whether the total harmonic current value of the output signal of the inverter after adjustment is larger than that of the output signal of the inverter before adjustment, changing the adjustment direction and then returning to the step 3 if yes, or otherwise, maintaining the current adjustment direction and returning to the step 3. The inverter can be ensured to adapt to different on-site power grid working conditions, so that the output performance of the inverter is optimal.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and in particular relates to a method and a device for controlling the output of an inverter in a photovoltaic system. Background technique [0002] The inverter works under the control of the inverter controller. Existing inverter controllers generally use conventional PI control loops to implement control functions. Due to the fixed parameters in the PI control loop, the power quality of the inverter output cannot be optimal due to the unfavorable working conditions such as high grid impedance and grid quality. Contents of the invention [0003] The object of the present invention is to provide an inverter optimal output control method which can ensure that the inverter adapts to different on-site power grid conditions and optimize the output performance of the inverter. [0004] In order to achieve the above object, the technical scheme adopted in the present invention is: [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02J3/38
CPCH02J3/38H02M7/48
Inventor 鲁海波黄敏方刚卢进军
Owner JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO LTD
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