Inverter anti-islanding detection method
A technology of islanding effect and detection method, applied in the field of inverter anti-islanding effect detection, can solve problems such as affecting the quality of incoming network current, and achieve the effects of avoiding current waveform distortion, simple control, and avoiding islanding phenomenon.
Inactive Publication Date: 2019-09-03
HEFEI UNIV OF TECH
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[0003] The purpose of the present invention is to provide an inverter anti-islanding effect detection method to solve the problem that the prior art inverter island active detection method will affect the quality of the grid current
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0024] Such as figure 1 As shown in the figure, the current sensor detects the three-phase grid current i of the inverter a i b and i c , the voltage sensor detects the three-phase grid-side voltage u of the inverter a , u b and u c , the reactive power Q output by the inverter is obtained by the power calculation unit, and the calculation process is:
[0025]
[0026]
[0027]
[0028] Where θ is obtained from the frequency of the grid-side voltage of the inverter, which is a phase angle that changes linearly and periodically from 0 to 2π, and the changing frequency is equal to the frequency of the grid-side voltage of the inverter. The initial value of θ can be any angle, and the inverter The frequency of the grid-side voltage is obtained by the error adjustment unit.
[0029] The power comparison unit compares the reactive power refer...
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The invention discloses an inverter anti-islanding detection method. A three-phase inverter is controlled by a DSP controller; a power calculation unit, a power comparison unit and an error adjustmentunit are constructed in the DSP controller; in the power calculation unit, the reactive power output by the inverter is calculated according to three-phase incoming current and three-phase network side voltage; in the power comparison unit, a reactive power reference is compared with reactive power negative feedback to obtain error signals of the reactive power; and in the error adjustment unit,the error signals of the reactive power are subjected to error adjustment by a PI regulator to obtain the frequency of the inverter network side voltage. The frequency of the inverter network side voltage participates in PWM control of the inverter, and thus, the three-phase incoming current of the inverter is controllable. Current waveform distortion in the case of normal grid-connected operationof the inverter caused by disturbance can be avoided, and no detection dead zone exists.
Description
technical field [0001] The invention relates to the field of inverter circuit signal detection methods, in particular to an inverter anti-islanding effect detection method. Background technique [0002] Common anti-islanding detection of inverters is divided into passive detection and active detection. Passive detection mainly detects parameters such as the frequency and voltage output by the AC side of the inverter. The amount of disturbance effectively reduces or eliminates the detection blind zone, but the amount of disturbance will affect the output performance of the inverter itself, such as increasing the distortion of the incoming grid current when the inverter is in normal operation. Contents of the invention [0003] The purpose of the present invention is to provide an inverter anti-islanding effect detection method to solve the problem in the prior art that the inverter island active detection method will affect the quality of the grid-incoming current. [0004...
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IPC IPC(8): G01R31/42
CPCG01R31/42
Inventor 郑昕昕陆胜梅刘新天何耀曾国建
Owner HEFEI UNIV OF TECH