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Control method for PI (power to loop) resonance of photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode)

A technology of discontinuous current mode and resonance control, applied in AC network to reduce harmonics/ripples, photovoltaic power generation, electrical components, etc., can solve problems such as low grid connection efficiency and large harmonics, and achieve lower THD value, The effect of suppressing the DC component and reducing the influence

Active Publication Date: 2015-04-01
华氢能源动力科技江苏有限公司
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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing photovoltaic inverter single-mode mode, when the input power is relatively low, the grid-connected efficiency is relatively low, and the harmonics at the zero-crossing point will be relatively large, the present invention provides a method that effectively improves the grid-connected power of the inverter. PI resonance control method of photovoltaic grid-connected inverter based on switching between current continuous mode and current discontinuous mode for efficiency and reduction of harmonics of grid-connected current

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  • Control method for PI (power to loop) resonance of photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode)
  • Control method for PI (power to loop) resonance of photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode)
  • Control method for PI (power to loop) resonance of photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode)

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[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] refer to Figure 1 to Figure 6 , a PI resonance control method for a photovoltaic grid-connected inverter switching between a continuous current mode and a discontinuous current mode, the control steps are as follows:

[0030] Detect photovoltaic input voltage V pv , set the reference voltage V st 30V, photovoltaic input voltage V pv with reference voltage V st For comparison, determine the photovoltaic input voltage V pv Whether it is higher than 30V, if it is higher than 30V, the controller can work normally, otherwise it will be detected in standby until the photovoltaic input voltage V pv higher than 30V.

[0031] Detect the inverter output voltage V o , and compare V o with boundary voltage V bo The size of the boundary voltage V bo It is the threshold voltage when switching between CCM mode and DCM mode. f is the switching frequency, n is the t...

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Abstract

The invention relates to a control method for PI (power to loop) resonance of a photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode). When the absolute value of grid-connected voltage Vo outputted by the photovoltaic inverter is higher than or equal to boundary voltage Vbo, the CCM control method is adopted; when the absolute value of the grid-connected voltage Vo outputted by the photovoltaic inverter is lower than the boundary voltage Vbo, the DCM control method is adopted. Under different working modes, the occupation space ratio of an alternating current small signal is adjusted by a PI resonance controller, so as to obtain the total occupation space ratio. According to the total occupation space ratio, the corresponding PWM (pulse width modulation) wave is generated to control the action of a pre-stage MOS (metal oxide semiconductor) tube, so as to enable the photovoltaic inverter to realize grid-connected output. The control method has the advantages that the harmonics of grid-connected current flowing through a zero point can be effectively eliminated, and the grid-connecting efficiency and grid-connecting quality of the inverter are improved.

Description

technical field [0001] The invention belongs to the field of new energy electronic control, in particular to a PI resonance control method of a photovoltaic grid-connected inverter. Background technique [0002] Grid-connected current control technology mainly includes traditional control technology and control technology based on modern control theory. Among them, the traditional grid-connected current control technologies mainly include PI control, hysteresis control, repetitive control, predictive current control, and single-cycle control methods. The grid-connected current control technologies based on modern control theory mainly include fuzzy control, sliding mode variable structure control, adaptive control and so on. For the existing micro-inverter products, due to cost considerations, PI controllers with simple algorithm, low implementation cost and good stability are basically used, but there are two problems in PI control: it is difficult to realize the reference...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/383Y02E10/56Y02E40/40
Inventor 艾青林杨象爽胥芳张立彬陈教料
Owner 华氢能源动力科技江苏有限公司
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