Active and passive combined electrical load three-phase imbalance adjusting device

A technology of power load and balance adjustment, which is applied in the direction of circuit devices, harmonic reduction devices, multi-phase network asymmetry reduction, etc., can solve problems such as harmonic amplification, and achieve no voltage flicker and fluctuation, smooth adjustment, No effect of harmonic current pollution

Pending Publication Date: 2018-03-06
广东正诚电气科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, TCR itself will generate some low-order harmonic currents. When the filte

Method used

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  • Active and passive combined electrical load three-phase imbalance adjusting device
  • Active and passive combined electrical load three-phase imbalance adjusting device
  • Active and passive combined electrical load three-phase imbalance adjusting device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: as attached Figure 1-2 As shown, a three-phase unbalance regulating device for combined active and passive power consumption is characterized in that it includes an AC power grid, a nonlinear load, a capacitor compensation circuit, a capacitor compensation circuit, an IGBT compensation circuit, and a protection The circuit and the intelligent controller for power quality adjustment are characterized in that: the capacitor compensation circuit, the capacitor compensation circuit, and the IGBT compensation circuit are respectively connected in parallel to the AC power grid, and the power quality adjustment intelligent controller controls and connects the capacitor compensation circuit, The capacitance compensation circuit and the IGBT compensation circuit are respectively provided with fusing protection devices correspondingly between the capacitance compensation circuit, the capacitance compensation circuit, the IGBT compensation circuit and the AC power gr...

Embodiment 2

[0044] Embodiment 2: Using the above-mentioned active and passive combined electric load three-phase unbalance regulating device to regulate electric energy.

[0045] 1. If figure 1 As shown, the above-mentioned active and passive combined power load three-phase unbalance adjustment device is connected in parallel in the power distribution network, and through the first current transformer group ( figure 1 The CT in the system) collects the system current signal in real time, and is quickly analyzed and processed by the internal special detection circuit and controller to judge the three-phase unbalance degree of the system, and at the same time calculate the three-phase balanced conversion current value, the fundamental wave unbalance and each harmonic Composition and reactive power conditions (including power factor).

[0046] The calculation formula of the three-phase unbalance degree is:

[0047]

[0048] Among them, Δ I％ is the three-phase unbalance degree, which i...

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PUM

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Abstract

The invention belongs to the technical field of electric energy quality control of a power distribution network, and specifically relates to an active and passive combined electrical load three-phaseimbalance adjusting device. The device mainly comprises an alternating current power grid, a non-linear load, a capacitance separate compensation circuit, a capacitance common compensation circuit, anIGBT compensating circuit, a protection circuit and an electric energy quality adjusting intelligent controller. The device is characterized in that the capacitance separate compensation circuit, thecapacitance common compensation circuit and the IGBT compensating circuit are separately connected to the alternating current power grid in parallel, and the electric energy quality adjusting intelligent controller is separately connected with the capacitance separate compensation circuit, the capacitance common compensation circuit and the IGBT compensating circuit in a controlled manner. Fusingprotection apparatuses are correspondingly and respectively arranged between the capacitance separate compensation circuit, the capacitance common compensation circuit and the IGBT compensating circuit, and the alternating current power grid, a zero-crossing switch array is controlled to perform dynamic switching on a capacitor core group, appropriate PWM switch signals are simultaneously outputto an IGBT module, and smooth adjustment of three-phase imbalance can be realized; reactive compensation and three-phase imbalance adjustment can be both realized; the response speed is fast, and voltage flicker and fluctuation can be avoided; and harmonic current pollution is avoided, the security is higher, and the reliability is better.

Description

technical field [0001] The invention relates to the field of research and development of electric energy quality control of distribution networks, in particular to a three-phase unbalance regulating device for combined active and passive electric loads. Background technique [0002] Rural power grids have already established a certain foundation after large-scale rural power grid transformation. However, due to historical development reasons and the objective factor that the service targets are rural users, the current development of rural power grids in China still generally suffers from insufficient infrastructure investment, The grid structure is unreasonable, and the technological means are relatively backward. There is a bottleneck in the development of the overall rural low-voltage power grid, which is far from meeting the growth rate of its demand. [0003] In this context, the State Grid has proposed the goal of building a strong smart grid, and the rural power grid ...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/18H02J3/01
CPCH02J3/01H02J3/1842H02J3/26Y02E40/30Y02E40/40Y02E40/50
Inventor 余伙庆陈益栓纪小勇佘纲歆
Owner 广东正诚电气科技有限公司
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