Control method of voltage-type impedance adapter for suppressing resonance of multi-inverter grid-connected system
A multi-inverter, control method technology, applied to AC network circuits, AC networks to reduce harmonics/ripples, electrical components, etc., can solve problems such as system instability, achieve easy implementation, suppress resonance and harmonics Magnification, good absorption effect
Active Publication Date: 2020-01-31
HEFEI UNIV OF TECH
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Problems solved by technology
[0014] The purpose of the present invention is to solve the problem of system instability caused by resonance and harmonics in the multi-inverter grid-connected system, and use the voltage-type impedance adapter to reshape and adapt the grid-connected point impedance to the virtual harmonic impedance to realize Effective suppression of resonance and harmonics in multi-inverter grid-connected systems
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Embodiment Construction
[0036] This example takes a system composed of two grid-connected inverters and voltage-type impedance adapters in a simulation software Matlab / Simulink as an example to illustrate a voltage-type impedance adapter control method that suppresses the resonance of a multi-inverter grid-connected system. The steps of this embodiment are as follows.
[0037] figure 1 It is the topological structure diagram of the voltage type impedance adapter in the embodiment of the present invention. It can be seen from this figure that the voltage-type impedance adapter is composed of a power electronic converter, which is connected in parallel at the common coupling point of the grid-connected power generation system. The voltage-type impedance adapter includes a DC side capacitor C, a three-phase full bridge and l V C V filter circuit, the DC side capacitor C, three-phase full bridge and filter circuit L V C V Connect sequentially;
[0038] Specifically, first in the simulation software...
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The invention provides a voltage type impedance adapter control method of restraining resonance of a multiple inverter grid-connected system. The voltage type impedance adapter control method of restraining resonance of a multiple inverter grid-connected system includes the step of performing sampling of voltage and current on a voltage type impedance adapter, wherein the implementation mode of the voltage type impedance adapter includes the steps: setting virtual harmonic wave impedance, obtaining a virtual harmonic wave voltage instruction value, obtaining PWM modulated wave through a voltage controller, and realizing indifference tracking of the instruction value. The voltage type impedance adapter control method can perform remodeling and adaption on the impedance of the multiple inverter grid-connected system by implementing the virtual harmonic wave impedance function, and can very effectively restrain system resonance and harmonic wave amplification. The voltage type impedance adapter can more easily virtualize smaller harmonic wave impedance, can achieve very good resonance restraining effect under excitation of the harmonic wave current source, and has a significant absorption function for the harmonic wave of the multiple inverter grid-connected system. Therefore, the voltage type impedance adapter control method of restraining resonance of a multiple inverter grid-connected system has great superiority.
Description
technical field [0001] The invention relates to a control method of a voltage-type impedance adapter that suppresses the resonance of a multi-inverter grid-connected system. The voltage-type impedance adapter realizes reshaping and adapting the grid-connection point impedance through virtual harmonic impedance, and can control the multi-inverter Effective suppression of resonance and harmonics in the grid-connected system. Background technique [0002] In recent years, renewable energy grid-connected power generation systems represented by photovoltaic and wind power have developed rapidly. However, the equivalent grid impedance formed by non-negligible distributed parameters in transformers and long-distance transmission lines in the multi-inverter grid-connected power generation system may cause the failure of the inverter damping strategy, thereby stimulating the gap between the multi-inverter grid-connected power generation system and the grid. resonance between them. ...
Claims
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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/382Y02E40/40
Inventor张兴周文翔李飞刘朋王艺潮谢震
OwnerHEFEI UNIV OF TECH