A damping control method and system for reducing inverter parallel resonance

A technology of damping control and inverter, applied in the direction of reducing/preventing power oscillation, reducing flicker of AC network, AC network circuit, etc., can solve problems that are not conducive to engineering applications, rectifiers do not undertake power conversion of power electronic converters, and consume costs and other issues to achieve the effect of ensuring robustness and flexibility, prolonging service life, and avoiding long-term use

Active Publication Date: 2020-09-25
STATE GRID QINGHAI ELECTRIC POWER +2
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Problems solved by technology

However, the filter of this rectifier is L-type, which is different from other LCL-type rectifiers in the system. At the same time, this rectifier does not undertake the power conversion function that power electronic converters should have
Therefore, it is equivalent to introducing additional electrical equipment to suppress resonance for the system, which consumes more cost and is not conducive to engineering applications.

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  • A damping control method and system for reducing inverter parallel resonance
  • A damping control method and system for reducing inverter parallel resonance
  • A damping control method and system for reducing inverter parallel resonance

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Embodiment Construction

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0062] The purpose of the present invention is to provide a damping control method and system for reducing parallel resonance of inverters, which adopts a double-layer control strategy, wherein the upper layer control is based on the charge of the DC side power supply of each inverter in the multi-inverter parallel system state, select a suitable enabled inverter from each of the inverters; the lower layer control sets a virtual resistance control loop in the w...

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Abstract

The present invention discloses a method and a system of damping control for reduction of inverter parallel resonance. The method and the system employ a dual-layer control strategy, upper-layer control selects one appropriate enabling inverter from each inverter according to one charge state of one direct current side power supply of each inverter in a multi-inverter parallel system, and lower-layer control arranges a virtual resistance control ring in a working circuit of the enabling inverter so as to perform active damping control for the enabling inverter and achieve resonance inhibitionof the multi-inverter parallel system. The method and the system only need to perform active damping control for one inverter to achieve resonance inhibition of all the inverters, a current measurement link of a network system is employed to perform parameter calculation in the process of achieving damping control of the inverters, and therefore, the fewest circuit modules are introduced to achieve inhibition of multi-inverter parallel resonance and the system cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of grid-connected control of new energy power generation, in particular to a damping control method and system for reducing parallel resonance of an inverter. Background technique [0002] As we all know, new energy and distributed power generation technologies have been developing continuously in recent years, and power electronic inverters have become important equipment for new energy power generation and grid connection. Due to its simple grid connection, easy control, and flexible operation according to the actual output of new energy, the current control inverter is widely used in the field of new energy power generation and grid connection. The operation of the inverter is mainly controlled by a pulse width modulation (PWM) signal, so there will be high-order harmonics near the switching frequency. In order to prevent the high-order harmonics generated by PWM from causing adverse effects on the power...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/002H02J3/24H02J3/382
Inventor梅生伟陈来军张节潭郑天文李春来杨立滨郭岩
OwnerSTATE GRID QINGHAI ELECTRIC POWER