A Resonance Suppression Method for Inverter Parallel System in Island Mode
A technology of resonance suppression and island mode, applied in the field of microgrid, can solve the problems of changing the amplitude-frequency characteristics of the output filter, reducing the filtering performance of the system, and increasing the damping of the system, so as to improve the stability of the system, improve the output characteristics, and improve the current sharing. performance effect
Active Publication Date: 2018-10-09
CHONGQING UNIV
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However, the above active damping resonance suppression strategies can be equivalent to virtual resistance acting on the output filter to increase system damping, which changes the amplitude-frequency characteristics of the output filter and may reduce the filtering performance of the system
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] The present invention is applicable to the resonance suppression method of the parallel inverter system in the island mode, wherein the control principle of each inverter unit is as follows: figure 1 As shown, DG is a distributed generator; C dc is the DC bus voltage stabilizing capacitor; L 1 , L 2 、C 1 Respectively output filter inductor 1, inductor 2 and filter capacitor; u ref is the given voltage; u o , i o Respectively, the output voltage and current of the inverter; i L is the inductor current; Z v is the virtual impedance; S i Indicates the driving signal of the i-th power tube, and the present invention adopts the SPWM modulation method. The block diagram of the system transfer function can be obtained from the schematic diagram of the double closed-loop control of the inverter unit as follows: figure 2 show...
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The invention discloses a resonance damping method of a parallel inverter system under an islanding mode. The resonance damping method includes that 1), parallel inverter units acquire respective output current, and the output current is subjected to first-order RC digital filtering to obtain respective feedback output current; 2), the inverter units multiply the respective feedback output current by introduced virtual impedance Zv and first-order RC series feedback digital filtering is conducted, so that respective additional voltage is obtained; 3), the inverter units superpose respective additional voltage to initial given voltage to obtain final voltage given instructions, the final voltage given instructions and feedback voltage subtract from each other, and differences are fed into a controller for regulation to obtain respective control voltage acting on the inverter units, so that resonance control of the parallel inverter system under the islanding mode is achieved. The resonance damping method of the parallel inverter system under the islanding mode has the advantages that virtual inductor L parameters are selected reasonably and a first-order RC series feedback digital filter is introduced to remold system network impedance, so that resonance damping is achieved and system stability is improved effectively.
Description
technical field [0001] The invention relates to distributed power generation technology, in particular to a method for suppressing resonance of an inverter parallel system in an island mode, and belongs to the technical field of micro-grids. Background technique [0002] With the increasing energy crisis and environmental pollution, the efficient and rational development and utilization of new energy is imperative, and distributed power generation systems have emerged as the times require. Distributed power generation systems generally operate in the form of microgrids, which can work in two modes: grid-connected and islanded. Due to the existence of special occasions such as remote islands, border defense areas, large-scale factories and mines, and special periods such as large power grid failures, the island mode will be an extremely important operation mode of the microgrid. Therefore, the modeling and stability of the microgrid system under the island operation Research...
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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor姚骏李嘉伟谭义程涛裴金鑫
OwnerCHONGQING UNIV