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Method for designing virtual resistance parameters of parallel impedance adapter

A virtual resistor and adapter technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as harsh conditions and difficult to achieve, and achieve the effect of accurate parameters and clear physical meaning

Active Publication Date: 2020-03-24
HEFEI UNIV OF TECH
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Problems solved by technology

[0006] 1) The proposed method is difficult to implement in practical applications due to harsh conditions;
[0007] 2) The proposed method fails to take into account the impedance adaptation characteristics of the impedance adapter, and only adjusts the parameters indirectly through sampling voltage or other methods, and the designed parameters are not optimal design

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  • Method for designing virtual resistance parameters of parallel impedance adapter
  • Method for designing virtual resistance parameters of parallel impedance adapter
  • Method for designing virtual resistance parameters of parallel impedance adapter

Examples

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Embodiment Construction

[0038] This example takes a 50kW inverter grid-connected power generation system with one parallel impedance adapter in the simulation software Matlab / Simulink as an example to illustrate a design method of the virtual resistance parameters of the parallel impedance adapter.

[0039] figure 1 It is the topology diagram of the 50kW inverter grid-connected power generation system involved in this example. It can be seen from this figure that the 50kW inverter grid-connected power generation system is composed of two power electronic converters in parallel. The LC filter is connected to the grid. The switching frequencies of the two power electronic converters included in the 50kW inverter grid-connected power generation system are both 8kHz and denoted as f s , the DC sources used are U dc1 800V, U dc2 is 800V; the filter inductors in the LC filter used are L respectively 1 3mH, L 2 is 3mH, and the filter capacitors are C 1 12.3µF, C 2 is 12.3μF; rated power P 1 , P 2 ...

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Abstract

The invention provides a method for designing virtual resistance parameters of a parallel impedance adapter. According to the method, a power grid impedance and new energy power generation system impedance model is obtained; after RLC circuit parameters of the impedance model are extracted at the resonant frequency, the damping ratio of the new energy power generation system before and after beingconnected with the power grid impedance is calculated, the damping ratio of the new energy power generation system after being connected with the power grid impedance is adjusted by designing virtualresistance parameters, and design of the virtual resistance parameters of the parallel impedance adapter is achieved. The design method is simple to implement, and the design of the virtual resistance parameters of the parallel impedance adapter can be realized according to the corresponding impedance characteristics only by obtaining the impedance model of the power grid impedance and the impedance model of the new energy power generation system, so that the method has obvious superiority.

Description

technical field [0001] The invention relates to a design method for virtual resistance parameters of a parallel impedance adapter, in particular to a method for calculating the connection of the new energy power generation system to the power grid after extracting corresponding RLC circuit parameters at the resonance frequency according to the obtained grid impedance and the new energy power generation system impedance model. The damping ratio before and after the impedance is adjusted by designing the virtual resistance parameters to adjust the damping ratio after the new energy power generation system is connected to the grid impedance, and the method of designing the virtual resistance parameters of the parallel impedance adapter is realized. Background technique [0002] In the context of high power electronics in the power system, in order to avoid harmonic interaction in the new energy power generation system under weak grid conditions, prevent the occurrence of resonan...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/381Y02E40/40
Inventor 李飞王艺潮刘洋张永新王付胜张兴
Owner HEFEI UNIV OF TECH
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