CN-122026371-A - Four-quadrant adjustable impedance-based power quality integrated management device and control method for power distribution network

CN122026371ACN 122026371 ACN122026371 ACN 122026371ACN-122026371-A

Abstract

The invention discloses a four-quadrant adjustable impedance-based power quality integrated treatment device and a control method for a power distribution network, which belong to the technical field of power quality integrated treatment and comprise a main circuit topology module, a coupling mechanism analysis module, a four-quadrant impedance regulation and control module, a cooperative control module and a communication interface unit, wherein the main circuit topology module adopts a three-phase four-bridge arm reconfigurable structure, harmonic filtering, reactive compensation and unbalance treatment functions are simultaneously realized through self-adaptive topology switching, the power quality monitoring module is used for collecting parameters of a power grid in real time, the coupling mechanism analysis module is used for outputting dynamic weight coefficients of treatment targets, the four-quadrant impedance regulation and control module supports continuous regulation of resistance, sensitivity, capacitance and composite characteristics according to the output result of the coupling mechanism analysis module, and the cooperative control module comprises a model prediction control unit, a dynamic weight distribution unit and a protection logic unit. The invention realizes the integrated unified control of harmonic suppression, reactive compensation and three-phase imbalance treatment based on the four-quadrant adjustable impedance dynamic reconstruction technology.

Inventors

YOU XINYU
YIN CHENBIN
HE YE
YAN HANSONG
HAO SHUQING
ZHANG CHAOLUN
XIE XINGLIANG
WANG YANG
HE MINGJUN
SONG ZIHONG
ZHOU ZIJIAN
YANG LUNHUI
TAN ZHUKUI
XU YUTAO
CAI YONGXIANG

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260512
Application Date: 20251226

Claims (10)

1. The power quality integrated management device for the power distribution network based on the four-quadrant adjustable impedance is characterized by comprising a main circuit topology module, a power quality monitoring module, a coupling mechanism analysis module, a four-quadrant impedance regulation and control module, a cooperative control module and a communication interface unit; the main circuit topology module adopts a three-phase four-bridge arm reconfigurable structure and comprises a power switch array, a multi-winding coupling reactor and an intelligent capacitor group, and the functions of harmonic wave filtering, reactive compensation and unbalance management are realized simultaneously through self-adaptive topology switching; The power quality monitoring module is arranged at the low-voltage side of the distribution transformer and the feeder line node and is used for collecting harmonic distortion rate, voltage unbalance degree, flicker value and impedance characteristic parameters of the power grid in real time; The coupling mechanism analysis module is in communication connection with the power quality monitoring module and is used for establishing a dynamic coupling equation for describing the interaction of the power quality problems based on the monitoring data, calculating a harmonic-voltage sensitivity coefficient and a negative sequence-zero sequence interaction factor and outputting a dynamic weight coefficient of each governance target; the four-quadrant impedance regulation and control module is integrated with the main circuit topology module and comprises a programmable LC network, a fast switch matrix and an impedance matching controller, and dynamically reconstructs impedance characteristics in a full phase range according to the output result of the coupling mechanism analysis module so as to support continuous regulation of resistance, sensitivity, capacitance and composite characteristics; the cooperative control module is connected with the main circuit topology module and the four-quadrant impedance regulation and control module and comprises a model prediction control unit, a dynamic weight distribution unit and a protection logic unit; The communication interface unit protocol is interconnected with the distribution network automation system, and supports remote parameter setting and energy efficiency optimization.
2. The four-quadrant adjustable-impedance-based power quality integrated management device for the power distribution network is characterized in that the main circuit topology module replaces a discrete device combination of a traditional active power filter and a static var generator through a self-adaptive topology switching technology to realize integrated integration of harmonic filtering, reactive compensation and unbalance management functions.
3. The power quality integrated management device of the power distribution network based on the four-quadrant adjustable impedance of claim 2, wherein the power quality monitoring module transmits monitoring data to the coupling mechanism analysis module in real time through an optical fiber ring network.
4. The four-quadrant adjustable impedance-based power quality integrated management device for the power distribution network, as set forth in claim 3, wherein the coupling mechanism analysis module adopts a double-field programmable gate array architecture, and is internally provided with a multi-parameter coupling model library and a real-time calculation engine; the multi-parameter coupling model library comprises a harmonic-voltage sensitivity matrix and a negative sequence-zero sequence interaction factor; The real-time calculation engine is used for dynamically calculating a harmonic-voltage sensitivity coefficient and a negative sequence-zero sequence interaction factor based on the monitoring data, establishing a dynamic coupling equation for describing the interaction of the electric energy quality problems, and outputting a dynamic weight coefficient of each governance target by solving the dynamic coupling equation in real time.
5. The four-quadrant adjustable-impedance-based power quality integrated management device for the power distribution network, as set forth in claim 4, is characterized in that the four-quadrant impedance regulation and control module dynamically reconstructs impedance characteristics in a full-phase range according to an analysis result of the coupling mechanism analysis module, so as to realize broadband compensation.
6. The four-quadrant adjustable impedance-based power quality integrated management device for the power distribution network, as set forth in claim 5, is characterized in that the model predictive control unit generates a switch driving signal in a rolling optimization mode; the dynamic weight distribution unit adjusts the priorities of harmonic wave management, reactive compensation and unbalance management in real time according to the coupling strength between the electric energy quality problems; the protection logic unit is used for realizing nanosecond fault locking.
7. The four-quadrant adjustable-impedance-based power quality integrated management device for the power distribution network is characterized in that the power switch array is made of silicon carbide devices; the cooperative control module adopts a double-digital signal processor plus field programmable gate array architecture; The model prediction control unit generates an optimal pulse width modulation sequence driving power switch array based on rolling time domain optimization.
8. A control method of a power quality integrated management device of a power distribution network based on four-quadrant adjustable impedance, which is applied to the power quality integrated management device of the power distribution network based on four-quadrant adjustable impedance according to any one of claims 1 to 7, and is characterized by comprising the following steps: the method comprises the steps that through an electric energy quality monitoring module which is arranged on a low-voltage side of a distribution transformer and a feeder node, harmonic distortion rate, voltage unbalance, flicker value and impedance characteristic parameters of a power grid are collected in real time; The coupling mechanism analysis module receives monitoring data, builds a multi-parameter coupling model library based on the topology parameters of the power distribution network, dynamically calculates harmonic-voltage sensitivity coefficients and negative sequence-zero sequence interaction factors, builds a dynamic coupling equation describing the interaction of the power quality problems, and outputs dynamic weight coefficients of all governance targets by solving the dynamic coupling equation in real time; The four-quadrant impedance regulation and control module dynamically reconstructs impedance characteristics in the full-phase range through a programmable LC network and a fast switch matrix according to the dynamic weight coefficient, and realizes continuous regulation of impedance among resistance, sensitivity, capacitance and composite characteristics; the model prediction control unit generates a switch driving signal based on rolling optimization, drives a three-phase four-bridge arm reconfigurable topology power switch array, and simultaneously realizes harmonic filtering, reactive compensation and unbalance management through self-adaptive topology switching; the dynamic weight distribution unit adjusts the priority of each governance target in real time according to the coupling strength between the electric energy quality problems; The protection logic unit monitors the system operation state and locks when a fault is detected.
9. The method for controlling the integrated management device of the power quality of the power distribution network based on the four-quadrant adjustable impedance of claim 8, wherein the coupling mechanism analysis module receives monitoring data, constructs a multi-parameter coupling model base based on topology parameters of the power distribution network, dynamically calculates harmonic-voltage sensitivity coefficients and negative sequence-zero sequence interaction factors, builds a dynamic coupling equation describing the interaction of the power quality problem, and outputs dynamic weight coefficients of management targets by solving the dynamic coupling equation in real time, Constructing a multi-parameter coupling model library based on line impedance, transformer transformation ratio and load characteristics of the power distribution network, wherein the multi-parameter coupling model library comprises a harmonic-voltage sensitivity matrix and a negative sequence-zero sequence interaction factor; Dynamically calculating a harmonic-voltage sensitivity coefficient and a negative sequence-zero sequence interaction factor in the current power grid state by adopting an improved particle swarm algorithm; Establishing a dynamic coupling equation describing the interaction of the electric energy quality problems according to the calculated sensitivity coefficient and the interaction factor; and solving a dynamic coupling equation in real time, quantitatively analyzing the interaction influence among different electric energy quality problems, and outputting the dynamic weight coefficient of each treatment target.
10. The method for controlling the power quality integrated management device of the power distribution network based on the four-quadrant adjustable impedance of claim 9, wherein the model prediction control unit generates a switch driving signal based on rolling optimization to drive a three-phase four-bridge arm reconfigurable topology power switch array, and harmonic filtering, reactive compensation and unbalance management are simultaneously realized through self-adaptive topology switching, The model prediction control unit establishes a prediction model of the three-phase four-leg reconfigurable topology; Based on the current power grid state and the dynamic weight coefficient of each treatment target, calculating an optimal control sequence in a future control period by adopting a rolling time domain optimization algorithm; Generating an optimal pulse width modulation switch driving signal; the power switch array, the multi-winding coupling reactor and the intelligent capacitor group are driven to act cooperatively, and harmonic filtering, reactive compensation and unbalance management are simultaneously realized through self-adaptive topology switching.

Description

Four-quadrant adjustable impedance-based power quality integrated management device and control method for power distribution network Technical Field The invention relates to the technical field of integrated management of electric energy quality, in particular to an integrated management device and a control method of electric energy quality of a power distribution network based on four-quadrant adjustable impedance. Background Currently, the power quality management of a power distribution network mainly adopts a layered compensation strategy that a passive filter is used for filtering specific subharmonics, an active power filter dynamically compensates broadband harmonics generated by nonlinear loads, and a static reactive compensation device improves voltage fluctuation by adjusting reactive power. These devices are typically deployed independently, with limited coordination achieved by a central controller. The traditional scheme relies on the quick response capability of the power electronic converter, but has the obvious defects that firstly, the impedance characteristic of a passive filter is fixed, the passive filter cannot adapt to the time-varying characteristic of a harmonic frequency spectrum and can be resonated with a system, secondly, active equipment is limited by the capacity of a switching device and is easy to overload when higher harmonic waves or large-capacity reactive power shortage is treated, and finally, a plurality of sets of devices are separated to run, so that control delay is caused, and the cost is increased due to repeated configuration of hardware. Along with the strong coupling of the harmonic wave-voltage-unbalance problem in the new energy high-permeability power distribution network, the prior art is difficult to realize rapid and accurate global management. The current power quality management technology of the power distribution network has the remarkable limitations that control parameters are usually preset based on fixed working conditions and are difficult to adapt to complex and changeable operation environments, a single-index independent control strategy is adopted, coupling effects among harmonic waves, voltages and unbalance degrees are ignored, mutual interference among management equipment is caused, passive response after faults is relied on, detection delay is not available, rapid transient processes such as sudden changes of new energy output cannot be handled, and separately deployed management equipment lacks collaborative optimization, so that the resource utilization rate is insufficient. These problems are particularly prominent in the power distribution network accessed by high-proportion new energy, and the treatment effect and the economic benefit are severely restricted. Disclosure of Invention In view of the problems, the invention provides a four-quadrant adjustable impedance-based power quality integrated management device and a control method for a power distribution network. The control method and the control system solve the technical problems that the control parameters of the current power quality control technology of the power distribution network are usually preset based on fixed working conditions and are difficult to adapt to complex and changeable operating environments, a single-index independent control strategy is adopted, coupling effects among harmonic waves, voltages and unbalance degrees are ignored, so that mutual interference among control devices is caused, the control system and the control system rely on passive response after faults, detection delay cannot cope with rapid transient processes such as sudden changes of new energy output, and the control devices deployed separately lack cooperative optimization, so that the resource utilization rate is insufficient. In order to solve the technical problems, the invention provides a four-quadrant adjustable impedance-based power quality integrated management device for a power distribution network, which comprises a main circuit topology module, a power quality monitoring module, a coupling mechanism analysis module, a four-quadrant impedance regulation and control module, a cooperative control module and a communication interface unit, wherein the main circuit topology module is connected with the power distribution network; the system comprises a main circuit topology module, a coupling mechanism analysis module, a four-quadrant impedance regulation module, a four-quadrant impedance control module, a control module and a control module, wherein the main circuit topology module adopts a three-phase four-bridge arm reconfigurable structure and comprises a power switch array, a multi-winding coupling reactor and an intelligent capacitor bank, harmonic filtering, reactive compensation and unbalance management functions are simultaneously realized through self-adaptive topology switching, the power quality monitoring module is deployed at a low-voltage side and a feeder nod