WO2020186411A1 - 一种用于低压配电网的电力负载均衡系统 - Google Patents

一种用于低压配电网的电力负载均衡系统 Download PDF

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WO2020186411A1
WO2020186411A1 PCT/CN2019/078390 CN2019078390W WO2020186411A1 WO 2020186411 A1 WO2020186411 A1 WO 2020186411A1 CN 2019078390 W CN2019078390 W CN 2019078390W WO 2020186411 A1 WO2020186411 A1 WO 2020186411A1
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signal
station
load balancing
phase
unit
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PCT/CN2019/078390
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English (en)
French (fr)
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孙文化
李选正
刘泽辰
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深圳德微电技术有限公司
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Priority to PCT/CN2019/078390 priority Critical patent/WO2020186411A1/zh
Publication of WO2020186411A1 publication Critical patent/WO2020186411A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • the present invention relates to the field of low-voltage power, in particular to a power load balancing system for low-voltage power distribution network.
  • the load of the distribution transformer of the low-voltage distribution network is generally composed of three-phase loads and single-phase loads.
  • Residential electricity is all single-phase loads.
  • the distribution network is relatively complicated, especially when a large number of single-phase loads are connected to the low-voltage distribution network. Power distribution system, and the load size is different and the power consumption time is different. Therefore, the current imbalance between the three phases in the low-voltage distribution network is objectively existing, and this power imbalance is irregular and cannot be predicted in advance. It is one of the main problems that have always plagued power supply units.
  • the three-phase current load of the low-voltage distribution network is unbalanced, which causes many faults.
  • the single-phase load of the transformer is too large and causes burnout, and the single-phase load is too large and the three-phase excessive unbalance and zero are caused.
  • Increasing line failures and large-scale regional "group burning" phenomena occur from time to time. Therefore, it is imperative and especially important to solve the three-phase imbalance problem of the low-voltage distribution network.
  • the distribution of the three-phase load is uneven, the use of the load is not synchronized, and the randomness is large, which causes the distribution transformer to be in a three-phase load unbalanced operation state at all times.
  • a power load balancing system for low-voltage power distribution network with patent number CN201510229756.8 discloses an extremely effective power system that can adjust power load balancing, which solves the uneven distribution of three-phase load in the power supply system
  • the current in the main line and the current in the branch line will generate a magnetic field under certain conditions, which affects the control main station and the control main station The communication between them makes the whole system unable to work normally and brings great inconvenience to the power system.
  • the purpose of the present invention is to solve the above problems and provide a power load balancing system for low-voltage power distribution network using network connection.
  • a power load balancing system for a low-voltage power distribution network including a power load balancing subsystem for controlling three-phase load balancing of a low-voltage power distribution network branch trunk line, and a power load balancing subsystem used to control the connection of the low-voltage power distribution network branch trunk line
  • the three-phase load balancing control terminal of the main line of the low-voltage distribution network; the power load balancing subsystem and the control main station are connected in communication, and the power load balancing subsystem controls the total phase load of each phase of the low-voltage distribution network branch line
  • the information is sent to the main control station;
  • the power load balancing subsystem includes a phase commutation device connected to the branch trunk line of the low-voltage distribution network and used to transmit power to the power consumption terminal and a control for controlling the three-phase load balance of the branch trunk line
  • the main station; the control main station includes a first transmitting unit and a first receiving unit for communicating with the main control station; an analysis unit for
  • the analysis unit is connected to the regional signal station through a network cable
  • the signal output end of the branch line time synchronizer is connected to the signal input end of the first transmitting unit and the second transmitting unit
  • the first transmitting unit and the first receiving unit are connected through the 4G network
  • the main control station the second transmitting unit and the second receiving unit are connected to the control master station in the adjacent power load balancing subsystem through the 4G network
  • the commutation device is set in the wireless signal range established by the regional signal station and passes through the area
  • the wireless signal established by the signal station is connected to the analysis unit network;
  • the control main station includes a signal transmission module for transmitting instructions or receipts, a signal receiving module for receiving relative load information, and a signal receiving module for controlling the relative totals on all branch lines.
  • the signal input terminal of the module and the signal output terminal of the main line time synchronizer are connected to the signal input terminal of the signal receiving module.
  • the total phase load information includes one or two of the current load and power load of each phase in the branch trunk line of the low-voltage distribution network, and the phase identification of each phase in the branch trunk line of the low-voltage distribution network .
  • control master station further includes a short message alarm unit, and the signal input end of the short message alarm unit is connected with the signal output end of the analysis unit.
  • main control station and the main control station are both provided with a built-in telephone card, and the main control station and the control main station communicate through a 4G network with the built-in telephone card.
  • the phase commutation device collects the total phase load information of each phase of the low-voltage distribution network branch trunk line and transmits it to the analysis unit of the control master station through the wireless signal established by the regional signal station.
  • the total load information is transmitted to the control terminal through the first transmitting unit.
  • the information receiving module in the control terminal After receiving the total load information of the phase, the information receiving module in the control terminal will transmit it to the calculation chip and the information transmission module respectively.
  • the phase total load information of each phase is calculated and processed, and the branch line adjustment information is sent to the commutation device through the control master station of the branch line, and the commutation device connects the power consumption terminal according to the branch line adjustment information
  • the access phase of the low-voltage distribution network branch and trunk line is switched to realize the three-phase load balance of the low-voltage distribution network branch trunk line;
  • the information transmitting module transmits the receiving time of the information receiving module as a receipt to the first receiving unit
  • the analysis unit compares the sending time of the information sent by the first transmitting unit with the time of receiving the information in the receipt. If the difference is small, it means that the communication is normal, and if the difference is large, it means that the communication has been affected. The external force cannot maintain the normal operation of the system.
  • the analysis unit will make the second transmitting unit send the total load information to the control master station in the adjacent power load balancing subsystem, and the control in the adjacent power load balancing subsystem
  • the master station receives the information through the second receiving unit and sends it to the main control station through the analysis unit and the first transmitting unit in turn, avoiding poor communication between the control main station and the control main station in a single power load balancing subsystem
  • the control master station establishes a wireless signal area through the regional signal station to connect to the phase conversion device for network connection, which avoids the communication between the control master station and the phase conversion device being affected by the magnetic field.
  • the occurrence of the situation guarantees the communication quality of the power load balancing subsystem and makes a great contribution to the construction of the power system.
  • the invention realizes the three-phase load balance of the branch and trunk lines of the low-voltage distribution network through the power load balancing subsystems arranged on the branch trunk lines of the low-voltage distribution network, and realizes low-voltage power distribution by controlling the control of each power load balance subsystem by the control terminal
  • the main line of the network has higher requirements for three-phase load balance; and its communication is connected by 4G network, which minimizes the influence of magnetic field on it, and continuously monitors the communication status to avoid the communication status. In good times, conditions that people cannot find in time occur, which improves the use effect of the present invention.
  • Figure 1 is a schematic diagram of the structure of a power load balancing system
  • Figure 2 is a frame structure diagram of the control master station
  • Figure 3 is the frame structure diagram of the control terminal.
  • a power load balancing system for low-voltage distribution network includes a power load balancing subsystem for controlling three-phase load balancing of branches and trunk lines of low-voltage distribution network and The control terminal that controls the three-phase load balancing of the main line of the low-voltage power distribution network connected to the main line of the low-voltage power distribution network; the communication connection between the power load balancing subsystem and the control terminal, and the power load balancing subsystem controls the low-voltage power distribution
  • the total phase load information of each phase of the main line of the network is sent to the main control station; the power load balancing subsystem includes a phase change device and a user connected to the main line of the low-voltage distribution network and used to transmit power to the power consumption terminal.
  • the main control station for controlling the three-phase load balance of the branch line;
  • the main control station includes a first transmitting unit and a first receiving unit for communicating with the main control station; an analysis unit for analyzing whether the communication is normal, and The regional signal station that establishes the wireless signal area, the second transmitting unit and the second receiving unit used to communicate with the control master station in the adjacent power load balancing subsystem, and the branch line time synchronizer used to record the signal transmission time;
  • the signal terminals of the first transmitting unit and the second transmitting unit are respectively connected to the signal terminal of the analysis unit in two directions.
  • the signal output terminals of the first receiving unit and the second receiving unit are respectively connected to the signal input terminal of the analysis unit.
  • the signal output terminal is connected to the signal input terminal of the second transmitting unit
  • the analysis unit is connected to the regional signal station through a network cable
  • the signal output terminal of the branch line time synchronizer is connected to the signal input terminal of the first transmitting unit and the second transmitting unit respectively
  • the first transmitting unit and the first receiving unit are connected to the main control station through the 4G network
  • the second transmitting unit and the second receiving unit are connected to the control main station in the adjacent power load balancing subsystem through the 4G network.
  • the commutation device is set in Within the wireless signal range established by the regional signal station and connected to the analysis unit network through the wireless signal established by the regional signal station;
  • the central control station includes a signal transmitting module for transmitting instructions or receipts, and a signal receiving for receiving relative total load information Module, calculation chip used to calculate the total phase load information on all branch lines, main line time synchronizer used to record signal transmission time;
  • the signal output end of the signal receiving module is respectively connected to the signal of the calculation chip and the signal transmitting module
  • the signal output terminal of the computing chip is connected to the signal input terminal of the signal transmitting module, and the signal output terminal of the main line time synchronizer is connected to the signal input terminal of the signal receiving module.
  • a phase commutation device the three-phase input terminal of which is used for electrical connection with the three-phase line of the low-voltage power distribution network, the single-phase output terminal is used for electrical connection with the electrical terminal, and the phase commutation device is used to realize the access of the electrical terminal Low-voltage power distribution network access phase switching operation, and sending the load information of the power consumption terminal to the control master station, and receiving phase switching information sent by the control master station;
  • the control master station according to the received load information of the power consumption terminal sent by the phase-changing device and the branch line adjustment information sent by the control main station, performs phase switching on the power consumption terminal and the access low-voltage distribution of the power consumption terminal.
  • the access phase of the power grid branch line is switched from the current phase to the target phase phase switching information, so that the three-phase load imbalance of the low-voltage distribution network branch line is less than the first balance threshold, and all
  • the phase switching information of the power consumption terminal is sent to the commutation device of the corresponding power consumption terminal;
  • the balance threshold can be a national standard value, such as 15%; it can also be set according to load balancing requirements.
  • the phase commutation device switches the access phase of the power consumption terminal to the low-voltage distribution network branch line from the current phase to the target phase of the phase switching information according to the received phase switching information of the power consumption terminal.
  • the total phase load information includes one or two of the current load and power load of each phase in the branch trunk line of the low-voltage distribution network, and the phase identification of each phase in the branch trunk line of the low-voltage distribution network.
  • the power load balancing subsystem manipulates the built-in commutation device according to the received branch and trunk line adjustment information to switch the power-consuming terminal to access the low-voltage distribution network branch and trunk line.
  • the control station According to the received information of the total phase load of each phase of the low-voltage distribution network branch main line, the control station selects the low-voltage distribution network branch main line that needs three-phase load adjustment, and maintains the low-voltage distribution network branch.
  • the three-phase load imbalance of the trunk line is greater than the first balance threshold, determine the load information of the branch trunk line of the low-voltage distribution network from the phase with the larger total load information to the phase with the smaller total load information.
  • the phase with the larger total load information, the phase with the smaller total load information, and the adjustment value constitute a support
  • the trunk line adjustment information, the control terminal sends the branch trunk line adjustment information to the power load balancing subsystem corresponding to the branch trunk line of the low-voltage distribution network.
  • the control master station also includes a short message alarm unit, and the signal input end of the short message alarm unit is connected with the signal output end of the analysis unit.
  • the main control station and the main control station are equipped with built-in telephone cards, and the main control station and the main control station communicate through the 4G network with the built-in telephone cards.
  • the phase commutation device collects the total phase load information of each phase of the low-voltage distribution network branch trunk line and transmits it to the analysis unit of the control master station through the wireless signal established by the regional signal station.
  • the total load information is transmitted to the control terminal through the first transmitting unit.
  • the information receiving module in the control terminal After receiving the total load information of the phase, the information receiving module in the control terminal will transmit it to the calculation chip and the information transmission module respectively.
  • the phase total load information of each phase is calculated and processed, and the branch line adjustment information is sent to the commutation device through the control master station of the branch line, and the commutation device connects the power consumption terminal according to the branch line adjustment information
  • the access phase of the low-voltage distribution network branch and trunk line is switched to realize the three-phase load balance of the low-voltage distribution network branch trunk line;
  • the information transmitting module transmits the receiving time of the information receiving module as a receipt to the first receiving unit
  • the analysis unit compares the sending time of the information sent by the first transmitting unit with the time of receiving the information in the receipt. If the difference is small, it means that the communication is normal, and if the difference is large, it means that the communication has been affected. The external force cannot maintain the normal operation of the system.
  • the analysis unit will make the second transmitting unit send the total load information to the control master station in the adjacent power load balancing subsystem, and the control in the adjacent power load balancing subsystem
  • the master station receives the information through the second receiving unit and sends it to the main control station through the analysis unit and the first transmitting unit in turn, avoiding poor communication between the control main station and the control main station in a single power load balancing subsystem
  • the control master station establishes a wireless signal area through the regional signal station to connect to the phase conversion device for network connection, which avoids the communication between the control master station and the phase conversion device being affected by the magnetic field.
  • the occurrence of the situation guarantees the communication quality of the power load balancing subsystem and makes a great contribution to the construction of the power system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

本发明公开了一种用于低压配电网的电力负载均衡系统，包括电力负载均衡子系统和控制总站；两者通过通信连接，电力负载均衡子系统包括换相装置和控制主站；控制主站包括第一发射单元、第一接收单元；第一、二发射单元分别与分析单元双向连接，第一、二接收单元分别与分析单元连接，第二接收单元与第二发射单元连接，分析单元与区域信号站通过网线连接，支干线时间同步器分别与第一、二发射单元连接，第一发射单元、第一接收单元通过4G网络与控制总站连接，第二发射单元、第二接收单元通过4G网络与相邻的电力负载均衡子系统中的控制主站连接，换相装置设置在区域信号站建立的无线信号范围内并通过无线信号与分析单元网络连接。

Description

一种用于低压配电网的电力负载均衡系统 技术领域
本发明涉及低压电力领域，尤其涉及一种用于低压配电网的电力负载均衡系统。
背景技术
众所周知，低压配电网的配电变压器的负荷一般由三相负荷与单相负荷混合组成，居民用电均为单相负载，配网比较复杂，尤其大量单相负载接入低压配电网的配电系统，并且负载大小不同和用电时间不同，所以，低压配电网中的三相间的电流不平衡是客观存在的，并且这种用电不平衡状况无规律性，事先也无法预知，是一直困扰供电单位的主要问题之一。低压配电网的三相电流负载不平衡，随之造成不少故障，如在用电高峰期变压器单相负载过大而导致烧坏，单相负载过大导致三相过度的不平衡、零线故障增加、大片区域性“群烧”现象时有发生，因此，解决低压配网三相不平衡问题势在必行、尤为重要。三相四线制供电系统中三相负荷的分配不均匀,负荷的使用不同步、随机性大，造成了配电变压器时刻处在三相负载不平衡运行状态。这不仅增加线路损耗和配变损耗，还会造成线路三相电压的不平衡，而三相负载不平衡运行对低压配电网有很大影响，如对电能质量和供电质量有着严重的影响，同时也会加快配变设施老化，减少配电变压器的出力等。
专利号为CN201510229756.8的一种用于低压配电网的电力负载均衡系统公开了一种极为有效的可以调节电力负载均衡的电力系统，该系统解决了供电系统中三相负荷的分配不均匀的问题，但是在使用过程中发现，主干线路和支干线路在连接过程中，主干线路中的电流与支干线路中的电流会在一定条件下产生磁场，从而影响了控制总站与控制主站之间的通信，从而使得整个系统无 法正常的工作，给电力系统带来了极大的不便。
发明内容
本发明目的是针对上述问题，提供一种使用网络连接的用于低压配电网的电力负载均衡系统。
为了实现上述目的，本发明的技术方案是：
一种用于低压配电网的电力负载均衡系统，包括用于控制低压配电网支干线路三相负载平衡的电力负载均衡子系统和用于控制所述低压配电网支干线路所连接的低压配电网主干线路三相负载平衡的控制总站；电力负载均衡子系统和控制总站间通信连接，电力负载均衡子系统把所述低压配电网支干线路的每一相的相总负载信息发送到控制总站；所述电力负载均衡子系统包括连接在低压配电网支干线路上且用于向用电终端输送电力的换相装置和用于控制该支干线路三相负载平衡的控制主站；所述控制主站包括用于与控制总站通信的第一发射单元、第一接收单元；用于分析通信是否正常的分析单元、用于建立无线信号区域的区域信号站、用于与相邻的电力负载均衡子系统中的控制主站通信的第二发射单元、第二接收单元，用于记录信号传输时间的支干线时间同步器；第一发射单元、第二发射单元的信号端分别与分析单元的信号端双向连接，第一接收单元、第二接收单元的信号输出端分别与分析单元的信号输入端连接，第二接收单元的信号输出端与第二发射单元的信号输入端连接，分析单元与区域信号站通过网线连接，支干线时间同步器的信号输出端分别与第一发射单元、第二发射单元的信号输入端连接，第一发射单元、第一接收单元通过4G网络与控制总站连接，第二发射单元、第二接收单元通过4G网络与相邻的电力负载均衡子系统中的控制主站连接，换相装置设置在区域信号站建立的无线信号范围内并通过区域信号站建立的无线信号与分析单元网络连接；所述控 制总站包括用于发射指令或回执的信号发射模块、用于接收相总负载信息的信号接收模块、用于对所有支干线路上的相总负载信息进行计算的计算芯片、用于记录信号传输时间的主干线时间同步器；信号接收模块的信号输出端分别连接计算芯片、信号发射模块的信号输入端，计算芯片的信号输出端连接信号发射模块的信号输入端，主干线时间同步器的信号输出端连接信号接收模块的信号输入端。
进一步的，所述相总负载信息包括低压配电网支干线路中每一相的电流负载、功率负载中的一种或两种以及低压配电网支干线路中每一相的相别标识。
进一步的，所述控制主站还包括短信报警单元，短信报警单元的信号输入端与分析单元的信号输出端连接。
进一步的，所述控制总站、控制主站均设置有内置电话卡，控制总站、控制主站通过内置电话卡的4G网络进行通信连接。
与现有技术相比，本发明具有的优点和积极效果是：
本发明在工作时，换相装置将低压配电网支干线路的每一相的相总负载信息进行采集并通过区域信号站建立的无线信号传递给控制主站的分析单元，分析单元将相总负载信息通过第一发射单元传递给控制总站，控制总站内的信息接收模块在接收到该相总负载信息后会分别传递给计算芯片和信息发射模块，计算芯片对低压配电网支干线路的每一相的相总负载信息进行运算处理，并将支干线路调整信息通过该支干线路的控制主站发送到换相装置，换相装置根据支干线路调整信息对用电终端接入该低压配电网支干线路的接入相别进行切换，以实现低压配电网支干线路的三相负载平衡；信息发射模块将信息接收模块的接收时间作为回执通过第一接收单元传递给分析单元，分析单元对第一发射单元发送信息的发送时间和回执中收到信息的时间进行比较，如果其相差较 小，则说明该通信正常，如果其相差较大，则说明该通信受到了外力影响，不能保持系统的正常工作，分析单元会令第二发射单元将相总负载信息发送到相邻的电力负载均衡子系统中的控制主站，相邻的电力负载均衡子系统中的控制主站通过第二接收单元接收到信息并依次通过分析单元、第一发射单元发送到控制总站，避免了单个电力负载均衡子系统中的控制主站与控制总站之间出现通信状况不佳的情况发生，提高了本发明的使用效果；另一方面，控制主站通过区域信号站建立无线信号区域与换相装置进行网络连接，避免了控制主站与换相装置之间的通信受到磁场影响的状况发生，保证了电力负载均衡子系统的通信质量，给电力系统的建设做出了极大的贡献。
本发明通过设置在低压配电网支干线路的电力负载均衡子系统，实现低压配电网支干线路的三相负载平衡，通过控制总站对各个电力负载均衡子系统的控制，实现低压配电网主干线路具有更高的三相负载平衡要求；并且其通讯均采用4G网络进行连接，最大程度的减小了磁场对其造成的影响，并且不断的对通信状况进行检测，避免了通信状况不佳时人们无法及时发现的状况发生，提高了本发明的使用效果。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为电力负载均衡系统的结构示意图；
图2为控制主站的框架结构图；
图3为控制总站的框架结构图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
如图1、图2和图3所示，一种用于低压配电网的电力负载均衡系统，包括用于控制低压配电网支干线路三相负载平衡的电力负载均衡子系统和用于控制所述低压配电网支干线路所连接的低压配电网主干线路三相负载平衡的控制总站；电力负载均衡子系统和控制总站间通信连接，电力负载均衡子系统把所述低压配电网支干线路的每一相的相总负载信息发送到控制总站；所述电力负载均衡子系统包括连接在低压配电网支干线路上且用于向用电终端输送电力的换相装置和用于控制该支干线路三相负载平衡的控制主站；所述控制主站包括用于与控制总站通信的第一发射单元、第一接收单元；用于分析通信是否正常的分析单元、用于建立无线信号区域的区域信号站、用于与相邻的电力负载均衡子系统中的控制主站通信的第二发射单元、第二接收单元，用于记录信号传输时间的支干线时间同步器；第一发射单元、第二发射单元的信号端分别与分析单元的信号端双向连接，第一接收单元、第二接收单元的信号输出端分别与分析单元的信号输入端连接，第二接收单元的信号输出端与第二发射单元的信号输入端连接，分析单元与区域信号站通过网线连接，支干线时间同步器的信号输出端分别与第一发射单元、第二发射单元的信号输入端连接，第一发射单元、第一接收单元通过4G网络与控制总站连接，第二发射单元、第二接收单元通过4G网络与相邻的电力负载均衡子系统中的控制主站连接，换相 装置设置在区域信号站建立的无线信号范围内并通过区域信号站建立的无线信号与分析单元网络连接；所述控制总站包括用于发射指令或回执的信号发射模块、用于接收相总负载信息的信号接收模块、用于对所有支干线路上的相总负载信息进行计算的计算芯片、用于记录信号传输时间的主干线时间同步器；信号接收模块的信号输出端分别连接计算芯片、信号发射模块的信号输入端，计算芯片的信号输出端连接信号发射模块的信号输入端，主干线时间同步器的信号输出端连接信号接收模块的信号输入端。
换相装置，其三相输入端用于和所述低压配电网的三相线分别电连接，单相输出端用于和用电终端电连接，换相装置用于实现用电终端接入低压配电网的接入相别的切换操作，并将用电终端的负载信息发送到控制主站，及接收控制主站发送的相别切换信息；
控制主站根据所接收的换相装装置发送的用电终端的负载信息及控制总站发送的支干线路调整信息，对需要进行相别切换的用电终端和该用电终端的接入低压配电网支干线路的接入相别从当前相别切换到目标相别的相别切换信息，以使低压配电网支干线路的三相负载不平衡度小于第一平衡阈值，并把所述用电终端的相别切换信息发送到与其相对应的用电终端的换相装置；
平衡度阈值可以采用国家标准值，如15％；也可以根据负载平衡要求，自行设定。
换相装置根据所接收的用电终端的相别切换信息将用电终端接入低压配电网支干线路的接入相别由当前相别切换到所述相别切换信息的目标相别。
相总负载信息包括低压配电网支干线路中每一相的电流负载、功率负载中的一种或两种以及低压配电网支干线路中每一相的相别标识。
电力负载均衡子系统根据接收的支干线路调整信息操纵内置的换相装置 切换用电终端接入该低压配电网支干线路的接入相别。控制总站根据所接收的低压配电网支干线路的每一相的相总负载信息进行运算处理，选择需要进行三相负载调整的低压配电网支干线路，在保持该低压配电网支干线路的三相负载不平衡度大于第一平衡阈值时，确定该低压配电网支干线路的从相总负载信息大的相别向相总负载信息小的相别需要调整的负载信息的调整量值，以使低压配电网主干线路的三相负载不平衡度小于第一平衡阈值，所述相总负载信息大的相别、相总负载信息小的相别及调整量值构成支干线路调整信息，控制总站把所述支干线路调整信息发送到与低压配电网支干线路相对应的电力负载均衡子系统。
控制主站还包括短信报警单元，短信报警单元的信号输入端与分析单元的信号输出端连接。在单个电力负载均衡子系统中的第二发射单元向相邻的电力负载均衡子系统中的第二接收单元发送相总负载信息后，第二接收单元会命令第二发射单元发送回执，单个电力负载均衡子系统中的分析单元对回执中的接收时间和发送时间进行对比，如果发现其通讯状况也不佳，则通过短信报警单元向管理端发送报警短信，使得管理端可以迅速得到故障位置，对其进行维修操作。
控制总站、控制主站均设置有内置电话卡，控制总站、控制主站通过内置电话卡的4G网络进行通信连接。
本发明在工作时，换相装置将低压配电网支干线路的每一相的相总负载信息进行采集并通过区域信号站建立的无线信号传递给控制主站的分析单元，分析单元将相总负载信息通过第一发射单元传递给控制总站，控制总站内的信息接收模块在接收到该相总负载信息后会分别传递给计算芯片和信息发射模块，计算芯片对低压配电网支干线路的每一相的相总负载信息进行运算处理，并将 支干线路调整信息通过该支干线路的控制主站发送到换相装置，换相装置根据支干线路调整信息对用电终端接入该低压配电网支干线路的接入相别进行切换，以实现低压配电网支干线路的三相负载平衡；信息发射模块将信息接收模块的接收时间作为回执通过第一接收单元传递给分析单元，分析单元对第一发射单元发送信息的发送时间和回执中收到信息的时间进行比较，如果其相差较小，则说明该通信正常，如果其相差较大，则说明该通信受到了外力影响，不能保持系统的正常工作，分析单元会令第二发射单元将相总负载信息发送到相邻的电力负载均衡子系统中的控制主站，相邻的电力负载均衡子系统中的控制主站通过第二接收单元接收到信息并依次通过分析单元、第一发射单元发送到控制总站，避免了单个电力负载均衡子系统中的控制主站与控制总站之间出现通信状况不佳的情况发生，提高了本发明的使用效果；另一方面，控制主站通过区域信号站建立无线信号区域与换相装置进行网络连接，避免了控制主站与换相装置之间的通信受到磁场影响的状况发生，保证了电力负载均衡子系统的通信质量，给电力系统的建设做出了极大的贡献。

Claims (4)

  1. 一种用于低压配电网的电力负载均衡系统，包括用于控制低压配电网支干线路三相负载平衡的电力负载均衡子系统和用于控制所述低压配电网支干线路所连接的低压配电网主干线路三相负载平衡的控制总站；电力负载均衡子系统和控制总站间通信连接，电力负载均衡子系统把所述低压配电网支干线路的每一相的相总负载信息发送到控制总站；其特征在于：所述电力负载均衡子系统包括连接在低压配电网支干线路上且用于向用电终端输送电力的换相装置和用于控制该支干线路三相负载平衡的控制主站；所述控制主站包括用于与控制总站通信的第一发射单元、第一接收单元；用于分析通信是否正常的分析单元、用于建立无线信号区域的区域信号站、用于与相邻的电力负载均衡子系统中的控制主站通信的第二发射单元、第二接收单元，用于记录信号传输时间的支干线时间同步器；第一发射单元、第二发射单元的信号端分别与分析单元的信号端双向连接，第一接收单元、第二接收单元的信号输出端分别与分析单元的信号输入端连接，第二接收单元的信号输出端与第二发射单元的信号输入端连接，分析单元与区域信号站通过网线连接，支干线时间同步器的信号输出端分别与第一发射单元、第二发射单元的信号输入端连接，第一发射单元、第一接收单元通过4G网络与控制总站连接，第二发射单元、第二接收单元通过4G网络与相邻的电力负载均衡子系统中的控制主站连接，换相装置设置在区域信号站建立的无线信号范围内并通过区域信号站建立的无线信号与分析单元网络连接；所述控制总站包括用于发射指令或回执的信号发射模块、用于接收相总负载信息的信号接收模块、用于对所有支干线路上的相总负载信息进行计算的计算芯片、用于记录信号传输时间的主干线时间同步器；信号接收模块的信号输出端分别连接计算芯片、信号发射模块的信号输入端，计算芯片的信号输出端连接信号发射模块的信号输入端，主干线时间同步器的信号输出端 连接信号接收模块的信号输入端。
  2. 如权利要求1所述的用于低压配电网的电力负载均衡系统，其特征在于：所述相总负载信息包括低压配电网支干线路中每一相的电流负载、功率负载中的一种或两种以及低压配电网支干线路中每一相的相别标识。
  3. 如权利要求1所述的用于低压配电网的电力负载均衡系统，其特征在于：所述控制主站还包括短信报警单元，短信报警单元的信号输入端与分析单元的信号输出端连接。
  4. 如权利要求1所述的用于低压配电网的电力负载均衡系统，其特征在于：所述控制总站、控制主站均设置有内置电话卡，控制总站、控制主站通过内置电话卡的4G网络进行通信连接。
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