Method of suppressing resonance of photovoltaic grid-connected system based on improved deadbeat

A resonance suppression and dead-beat control technology, applied in photovoltaic power generation, AC network to reduce harmonic/ripple, AC network circuit, etc., can solve the problems of increasing primary investment and increasing system operation loss, etc., to increase current bandwidth , reduce the control delay, and suppress the effect of resonance

Active Publication Date: 2017-11-21
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology

However, these methods all require the installation of additional power equipment, which increases the primary investment and increases the operating loss of the system.

Method used

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  • Method of suppressing resonance of photovoltaic grid-connected system based on improved deadbeat
  • Method of suppressing resonance of photovoltaic grid-connected system based on improved deadbeat
  • Method of suppressing resonance of photovoltaic grid-connected system based on improved deadbeat

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0062] Such as figure 1 As shown, a resonance suppression method based on the improved deadbeat photovoltaic grid-connected system includes the following steps:

[0063] Step 1. According to the equivalent model of photovoltaic grid-connected system, the influence of system parameters in the equivalent model on the output current of the inverter is studied, and the cause of resonance is analyzed.

[0064] Such as figure 2 As shown, the equivalent model of LCL photovoltaic grid-connected system, L 1j , L 1j and C fj are the inverter-side inductance, grid-side inductance and filter capacitor of the jth stand-alone grid-connected inverter, j=1,2,...,n, Z g Indicates the impedance of the grid...

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Abstract

The invention discloses a method of suppressing the resonance of a photovoltaic grid-connected system based on improved deadbeat, including the following steps: analyzing the cause of resonance; constructing an improved deadbeat control strategy according to the result of analysis, wherein the improved deadbeat control strategy is to predict the sampling current at a time k+2, calculate the PWM duty ratio Dk+1 of an inverter at a time k+1, and implement the PWM duty ratio Dk+1 in the photovoltaic grid-connected system at the time k+1; and combining the improved deadbeat control strategy with a virtual harmonic impedance method to suppress the resonance of the photovoltaic grid-connected system. The method can be used to suppress the resonance of the system.

Description

technical field [0001] The invention relates to a resonance suppression method based on an improved deadbeat photovoltaic grid-connected system, which belongs to the field of power electronics. Background technique [0002] Under the dual challenges of energy crisis and environmental pollution, vigorously developing distributed photovoltaic energy has become the consensus of all countries in the world. However, with the continuous improvement of photovoltaic penetration, the distributed photovoltaic grid-connected system will have adverse effects on the power quality of the distribution network, including voltage distortion at the grid-connected point, current harmonic injection, and three-phase imbalance. In view of the insufficient filtering effect of L or LC, LCL is more used in grid-connected inverters, which has a better suppression effect on high-frequency harmonics of inverter output current. However, LCL is an underdamped third-order system, and the operation and co...

Claims

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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 袁晓冬史明明葛乐费骏韬朱卫平柳丹罗珊珊张宸宇
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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