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Power grid high-frequency impedance reshaping device and method for suppressing distributed generation resonance

A distributed generation, high-frequency impedance technology, applied in circuit devices, harmonic reduction devices, electrical components, etc., can solve problems such as cascading failures, complex resonance networks, affecting power quality and stable operation of distribution networks, and achieve capacity Small, high switching frequency effect

Active Publication Date: 2021-01-22
国网宁夏电力有限公司经济技术研究院 +1
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AI Technical Summary

Problems solved by technology

In practical applications, the existence of grid impedance causes coupling between inverters, and the resulting resonant network is more complex. If effective suppression measures are not taken, it may cause faultless tripping of grid-connected inverters, or even Further cause cascading failures, thus affecting the power quality and stable operation of the distribution network

Method used

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  • Power grid high-frequency impedance reshaping device and method for suppressing distributed generation resonance
  • Power grid high-frequency impedance reshaping device and method for suppressing distributed generation resonance
  • Power grid high-frequency impedance reshaping device and method for suppressing distributed generation resonance

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Embodiment example

[0051] (3) Implementation case simulation waveform

[0052] by figure 1 Take the PCC1 point in the example as an example, the structure of this point is equivalent to Figure 5 As shown, the total grid-connected current of multiple grid-connected inverters is i pcc , PCC1 point voltage is recorded as u pcc , the grid high-frequency impedance reshaper is equivalent to R d . At 0.6s, the high-frequency impedance reshaper is connected, and the relevant simulation waveforms are as follows Figure 6-Figure 9 as shown, Image 6 Shown is the grid-connected point voltage waveform, Figure 7 Shown is the total grid current waveform, Figure 8 Shown is the detected resonant frequency ω r , Figure 9 Shown is the output current i of the high frequency impedance reshaper r . Before the 0.6s high-frequency impedance reshaper is connected, the grid-connected point voltage and current waveforms are distorted, and the detected resonance frequency is 350Hz; after the high-frequency...

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Abstract

The invention relates to a grid high-frequency impedance remodeling device for suppressing distributed generation resonance. The remodeling device is composed of a power grid-connected converter and aresonant impedance controller. The resonant impedance controller consists of a resonant detection module and a resonant current tracking module. The resonant detection module detects the voltage upccof a PCC point by a voltage sensor; predetermined circuit processing is carried out on the voltage upcc to obtain resonant voltage components upccr<+> and upccr< > and a resonant frequency omega r; and predetermined circuit processing is carried out on the resonant voltage components upccr<+> and upccr< >, the resonant frequency omega r, the voltage upcc of the PCC point, and a direct-current voltage Udc by the resonant current tracking module to obtain a PWM pulse signal for controlling connection or disconnection of a switching tube of a power grid-connected converter. According to the invention, the grid high-frequency impedance remodeling device is installed at the PCC point and detects the resonant voltage components of the PCC point; the resonant impedance controller including equivalent damping resistance information is used for obtaining a current instruction outputted by the converter; the converter is controlled to track the instruction value; and a virtual variable harmonicimpedance is generated to realize grid harmonic suppression.

Description

technical field [0001] The invention relates to the technical field of distributed generation harmonic control, in particular to a power grid high-frequency impedance reshaping device and method for suppressing distributed generation resonance. Background technique [0002] As the global energy crisis and environmental pollution become increasingly prominent, renewable energy power generation represented by photovoltaic power generation, wind power generation and hydropower generation is developing rapidly and will surely occupy an important position in the future energy composition. In view of the distribution characteristics of possible renewable energy dispersal and randomness, the most ideal choice at present is to adopt distributed generation (DG) technology. DG mainly uses the renewable energy around the load to realize the nearby consumption of electricity, and has many advantages such as less power transmission loss, energy security, environmental friendliness, and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/382H02J3/01Y02E40/40
Inventor 葛鹏江华光辉董晓晶栗峰周宗川汪春车彬汪海宁徐晓慧党东升郝卫国赵亮孔爱良田星梁硕冯雪于若英齐彩娟
Owner 国网宁夏电力有限公司经济技术研究院
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