WO2017185756A1 - Electric automobile and power grid interactive simulation load system and electrical protection method therefor - Google Patents

Electric automobile and power grid interactive simulation load system and electrical protection method therefor Download PDF

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Publication number
WO2017185756A1
WO2017185756A1 PCT/CN2016/108794 CN2016108794W WO2017185756A1 WO 2017185756 A1 WO2017185756 A1 WO 2017185756A1 CN 2016108794 W CN2016108794 W CN 2016108794W WO 2017185756 A1 WO2017185756 A1 WO 2017185756A1
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grid
module
monitoring terminal
battery
bidirectional
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PCT/CN2016/108794
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French (fr)
Chinese (zh)
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贺一之
赵明宇
储毅
张卫国
庞松岭
林道鸿
谢振超
邓育强
李香龙
刘秀兰
曾爽
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国电南瑞科技股份有限公司
国电南瑞南京控制系统有限公司
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Publication of WO2017185756A1 publication Critical patent/WO2017185756A1/en

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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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network

Definitions

  • the invention relates to an electric vehicle and grid interaction simulation load system and an electric protection method thereof, and belongs to the field of interaction between an electric vehicle and a power grid.
  • V2G Vehicle to Grid
  • V2G Vehicle to Grid
  • the electric vehicle as a mobile energy storage element realizes the bidirectional exchange of energy and information with the grid under controlled conditions.
  • V2G technology can realize power factor correction and energy bidirectional flow, which not only can filter out harmonic pollution, but also improve the stability and reliability of the power grid.
  • the development of electric vehicles has led to rapid development of battery storage methods.
  • V2G-based charging and discharging facilities still have problems such as low safety and reliability, single function, and high price.
  • the present invention provides an electric vehicle and grid interactive analog load system and an electrical protection method thereof.
  • An electric vehicle and a grid interactive analog load system comprising a battery system, a bidirectional AC/DC module, a grid connection control protection module and a monitoring terminal;
  • the battery system comprises a battery and a battery management system connected to the battery, wherein the monitoring terminal respectively Connected to a battery management system, a bidirectional AC/DC module, and a grid connection control protection module, the battery management system is also coupled to a bidirectional AC/DC module, the bidirectional AC/DC module being connected to the grid via a circuit breaker, the bidirectional AC The /DC module is also connected to the grid-connected control protection module, which is connected to the grid through a circuit breaker.
  • An electrical protection method for an electric protection method for an electric vehicle and a grid interactive simulation load system comprising the following steps,
  • Step 1 The battery management system measures the total charge current and SOC conditions and will The measured value is sent to the monitoring terminal;
  • Step 2 The monitoring terminal determines whether the total charging current exceeds a preset overcurrent protection threshold. If yes, the internal terminal is determined to be an internal fault, and the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker and exit the process; otherwise, go to step 3. ;
  • Step 3 The monitoring terminal determines whether the SOC condition exceeds a preset SOC working interval, and if so, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and exits the process; otherwise, proceeds to step 4;
  • Step 4 The bidirectional AC/DC module measures the input three-phase voltage, and sends the measured value to the monitoring terminal;
  • Step 5 The monitoring terminal measures the magnitude of the single-phase power, determines whether the three-phase voltage is sent to be distorted, and if yes, proceeds to step 6, otherwise, external protection is performed, that is, the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker. And issue an island signal to exit the process;
  • Step 6 determine whether to use the composite voltage to initiate overcurrent protection, if yes, go to step 7, otherwise exit the process;
  • Step 7 determine whether there is a sudden change in current or negative sequence current, if yes, the grid-connected control module voltage transformer disconnected, exit the process; otherwise, go to step 8;
  • step 8 it is judged whether the active power is reduced or over-limited. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and issues an island signal.
  • the trip command is issued after a delay of several seconds.
  • the invention achieves the beneficial effects achieved by the invention: the invention solves the electrical safety problem of the device itself during the simulated load working process and the grid connection safety problem when accessing the power grid, improves the safety of the device itself, and at the same time, monitors the SOC state of the battery. It is beneficial to improve the life of the battery and is beneficial to the promotion and application of the energy storage system in the V2G process.
  • Figure 1 shows the block diagram of the V2G analog load system.
  • FIG. 2 is a flow chart of an electrical protection method.
  • an electric vehicle interacts with a power grid to simulate a load system, including a battery system (PACK), a two-way AC/DC module, a grid-connected control protection module, and a monitoring terminal; wherein the battery system includes a battery and is connected to the battery.
  • Battery Management System (BMS) grid-connected control protection module is mainly responsible for over-current protection, over-voltage protection and island protection.
  • connection relationship of each component is as follows:
  • the monitoring terminal is respectively connected with the battery management system, the bidirectional AC/DC module and the grid connection control protection module, the battery management system is also connected with the bidirectional AC/DC module, the bidirectional AC/DC module is connected to the grid through the circuit breaker, and the bidirectional AC/DC module It is also connected to the grid-connected control protection module, and the grid-connected control protection module is connected to the grid through a circuit breaker.
  • the electrical protection method of the above system includes the following steps:
  • Step 1 The battery management system measures the total charging current and the SOC condition, and transmits the measured value to the monitoring terminal.
  • Step 2 The monitoring terminal determines whether the total charging current exceeds a preset overcurrent protection threshold. If yes, the internal terminal is determined to be an internal fault, and the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker and exit the process; otherwise, go to step 3. .
  • Step 3 The monitoring terminal determines whether the SOC condition exceeds a preset SOC working interval. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and exits the process; otherwise, proceeds to step 4.
  • Step 4 The bidirectional AC/DC module measures the input three-phase voltage and transmits the measured value to the monitoring terminal.
  • Step 5 The monitoring terminal measures the magnitude of the single-phase power, determines whether the three-phase voltage is sent to be distorted, and if yes, proceeds to step 6, otherwise, external protection is performed, that is, the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker. And send out an island signal to exit the process.
  • step 6 it is determined whether the composite voltage is used to initiate overcurrent protection. If yes, go to step 7, otherwise exit the process.
  • step 7 it is determined whether a current sudden change or a negative sequence ground current occurs. If yes, the grid-connected control module voltage transformer is disconnected, and the process is exited; otherwise, the process proceeds to step 8.
  • step 8 it is judged whether the active power is reduced or over-limited. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and issues an island signal.
  • the trip command is issued after a delay of several seconds to avoid protection from malfunction, and an alarm will be issued when internal or external faults occur.
  • the invention solves the electrical safety problem of the device itself during the simulated load working process and the grid-connected safety problem when the power is connected to the grid, and improves the safety of the device itself.
  • monitoring the SOC state of the battery is beneficial to improving the life of the battery, which is beneficial to Popularization and application of energy storage systems in V2G process.

Abstract

An electric automobile and a power grid interactive simulation load system, and an electrical protection method therefor. The system comprises a battery system, a bidirectional AC/DC module, a grid-connected control protection module and a monitoring terminal, wherein the battery system comprises a battery and a battery management system connected to the battery; the monitoring terminal is connected to the battery management system, the bidirectional AC/DC module and the grid-connected control protection module, respectively; the battery management system is further connected to the bidirectional AC/DC module; the bidirectional AC/DC module is connected to a power grid through a circuit breaker; the bidirectional AC/DC module is further connected to the grid-connected control protection module; and the grid-connected control protection module is connected to a power grid through a circuit breaker. The electrical safety problem of a device during a simulation load working process and the grid-connected safety problem when accessing a power grid are solved, and the safety of the device is improved.

Description

一种电动汽车与电网互动模拟负载系统及其电气保护方法Electric vehicle and grid interaction simulation load system and electric protection method thereof 技术领域Technical field
本发明涉及一种电动汽车与电网互动模拟负载系统及其电气保护方法，属于电动汽车与电网互动领域。The invention relates to an electric vehicle and grid interaction simulation load system and an electric protection method thereof, and belongs to the field of interaction between an electric vehicle and a power grid.
背景技术Background technique
V2G(Vehicle to Grid)理论就是电动汽车充电站与电网之间能量的双向流动即电动汽车作为移动储能元件在受控状态下实现与电网之间能量和信息的双向交换。V2G技术可以实现功率因数校正、能量双向流动，这不但可以滤除谐波污染，还可以提高电网的稳定性和可靠性。电动汽车的发展使电池储能方式得到了快速的发展。目前基于V2G的充放电设施还存在安全可靠性低，功能单一，价格较高等问题。V2G (Vehicle to Grid) theory is the two-way flow of energy between the electric vehicle charging station and the grid. That is, the electric vehicle as a mobile energy storage element realizes the bidirectional exchange of energy and information with the grid under controlled conditions. V2G technology can realize power factor correction and energy bidirectional flow, which not only can filter out harmonic pollution, but also improve the stability and reliability of the power grid. The development of electric vehicles has led to rapid development of battery storage methods. At present, V2G-based charging and discharging facilities still have problems such as low safety and reliability, single function, and high price.
发明内容Summary of the invention
为了解决上述技术问题，本发明提供了一种电动汽车与电网互动模拟负载系统及其电气保护方法。In order to solve the above technical problem, the present invention provides an electric vehicle and grid interactive analog load system and an electrical protection method thereof.
为了达到上述目的，本发明所采用的技术方案是：In order to achieve the above object, the technical solution adopted by the present invention is:
一种电动汽车与电网互动模拟负载系统，包括电池系统、双向AC/DC模块、并网控制保护模块和监控终端；所述电池系统包括电池以及与电池连接的电池管理系统，所述监控终端分别与电池管理系统、双向AC/DC模块和并网控制保护模块连接，所述电池管理系统还与双向AC/DC模块连接，所述双向AC/DC模块通过断路器与电网连接，所述双向AC/DC模块还与并网控制保护模块连接，所述并网控制保护模块通过断路器与电网连接。An electric vehicle and a grid interactive analog load system, comprising a battery system, a bidirectional AC/DC module, a grid connection control protection module and a monitoring terminal; the battery system comprises a battery and a battery management system connected to the battery, wherein the monitoring terminal respectively Connected to a battery management system, a bidirectional AC/DC module, and a grid connection control protection module, the battery management system is also coupled to a bidirectional AC/DC module, the bidirectional AC/DC module being connected to the grid via a circuit breaker, the bidirectional AC The /DC module is also connected to the grid-connected control protection module, which is connected to the grid through a circuit breaker.
一种电动汽车与电网互动模拟负载系统的电气保护方法的电气保护方法，包括以下步骤，An electrical protection method for an electric protection method for an electric vehicle and a grid interactive simulation load system, comprising the following steps,
步骤1，电池管理系统对充电总电流和SOC状况进行测量，并将 测量值发送给监控终端；Step 1. The battery management system measures the total charge current and SOC conditions and will The measured value is sent to the monitoring terminal;
步骤2，监控终端判断充电总电流是否超过预设的过流保护阈值，如果是，判定为内部故障，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤3；Step 2: The monitoring terminal determines whether the total charging current exceeds a preset overcurrent protection threshold. If yes, the internal terminal is determined to be an internal fault, and the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker and exit the process; otherwise, go to step 3. ;
步骤3，监控终端判断SOC状况是否超过预设的SOC工作区间，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤4；Step 3: The monitoring terminal determines whether the SOC condition exceeds a preset SOC working interval, and if so, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and exits the process; otherwise, proceeds to step 4;
步骤4，双向AC/DC模块对输入的三相电压进行测量，并将测量值发送给监控终端；Step 4: The bidirectional AC/DC module measures the input three-phase voltage, and sends the measured value to the monitoring terminal;
步骤5，监控终端测量单相功率的大小，判断三相电压是否发送畸变，如果是，则转至步骤6，否则进行外部保护，即监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号，退出流程；Step 5: The monitoring terminal measures the magnitude of the single-phase power, determines whether the three-phase voltage is sent to be distorted, and if yes, proceeds to step 6, otherwise, external protection is performed, that is, the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker. And issue an island signal to exit the process;
步骤6，判断是否采用复合电压起动过电流保护，如果是，则转至步骤7，否则退出流程；Step 6, determine whether to use the composite voltage to initiate overcurrent protection, if yes, go to step 7, otherwise exit the process;
步骤7，判断是否出现电流突变或者负序地电流，如果是，并网控制保护模块电压互感器断线，退出流程；否则转至步骤8；Step 7, determine whether there is a sudden change in current or negative sequence current, if yes, the grid-connected control module voltage transformer disconnected, exit the process; otherwise, go to step 8;
步骤8，判断是否出现有功功率减小或者超限，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号。In step 8, it is judged whether the active power is reduced or over-limited. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and issues an island signal.
跳闸命令延时若干秒后发出。The trip command is issued after a delay of several seconds.
本发明所达到的有益效果：本发明解决了模拟负载工作过程中设备自身的电气安全问题和接入电网时的并网安全问题，提高设备自身的安全性，同时，对电池SOC状态的监控有利于提高电池的寿命，有利于V2G过程中储能系统的推广应用。The invention achieves the beneficial effects achieved by the invention: the invention solves the electrical safety problem of the device itself during the simulated load working process and the grid connection safety problem when accessing the power grid, improves the safety of the device itself, and at the same time, monitors the SOC state of the battery. It is beneficial to improve the life of the battery and is beneficial to the promotion and application of the energy storage system in the V2G process.
附图说明DRAWINGS
图1为V2G模拟负载系统框图。Figure 1 shows the block diagram of the V2G analog load system.
图2为电气保护方法的流程图。2 is a flow chart of an electrical protection method.
具体实施方式 detailed description
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The invention is further described below in conjunction with the drawings. The following examples are only intended to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the scope of the present invention.
如图1所示，一种电动汽车与电网互动模拟负载系统，包括电池系统(PACK)、双向AC/DC模块、并网控制保护模块和监控终端；其中，电池系统包括电池以及与电池连接的电池管理系统(BMS)，并网控制保护模块主要负责过流保护、过压保护和孤岛保护。As shown in FIG. 1 , an electric vehicle interacts with a power grid to simulate a load system, including a battery system (PACK), a two-way AC/DC module, a grid-connected control protection module, and a monitoring terminal; wherein the battery system includes a battery and is connected to the battery. Battery Management System (BMS), grid-connected control protection module is mainly responsible for over-current protection, over-voltage protection and island protection.
各部件连接关系如下：The connection relationship of each component is as follows:
监控终端分别与电池管理系统、双向AC/DC模块和并网控制保护模块连接，电池管理系统还与双向AC/DC模块连接，双向AC/DC模块通过断路器与电网连接，双向AC/DC模块还与并网控制保护模块连接，并网控制保护模块通过断路器与电网连接。The monitoring terminal is respectively connected with the battery management system, the bidirectional AC/DC module and the grid connection control protection module, the battery management system is also connected with the bidirectional AC/DC module, the bidirectional AC/DC module is connected to the grid through the circuit breaker, and the bidirectional AC/DC module It is also connected to the grid-connected control protection module, and the grid-connected control protection module is connected to the grid through a circuit breaker.
上述系统的电气保护方法，具体如图2所示，包括以下步骤：The electrical protection method of the above system, as shown in FIG. 2, includes the following steps:
步骤1，电池管理系统对充电总电流和SOC状况进行测量，并将测量值发送给监控终端。Step 1. The battery management system measures the total charging current and the SOC condition, and transmits the measured value to the monitoring terminal.
步骤2，监控终端判断充电总电流是否超过预设的过流保护阈值，如果是，判定为内部故障，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤3。Step 2: The monitoring terminal determines whether the total charging current exceeds a preset overcurrent protection threshold. If yes, the internal terminal is determined to be an internal fault, and the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker and exit the process; otherwise, go to step 3. .
步骤3，监控终端判断SOC状况是否超过预设的SOC工作区间，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤4。Step 3: The monitoring terminal determines whether the SOC condition exceeds a preset SOC working interval. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and exits the process; otherwise, proceeds to step 4.
步骤4，双向AC/DC模块对输入的三相电压进行测量，并将测量值发送给监控终端。Step 4: The bidirectional AC/DC module measures the input three-phase voltage and transmits the measured value to the monitoring terminal.
步骤5，监控终端测量单相功率的大小，判断三相电压是否发送畸变，如果是，则转至步骤6，否则进行外部保护，即监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号，退出流程。Step 5: The monitoring terminal measures the magnitude of the single-phase power, determines whether the three-phase voltage is sent to be distorted, and if yes, proceeds to step 6, otherwise, external protection is performed, that is, the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker. And send out an island signal to exit the process.
步骤6，判断是否采用复合电压起动过电流保护，如果是，则转至步骤7，否则退出流程。 In step 6, it is determined whether the composite voltage is used to initiate overcurrent protection. If yes, go to step 7, otherwise exit the process.
步骤7，判断是否出现电流突变或者负序地电流，如果是，并网控制保护模块电压互感器断线，退出流程；否则转至步骤8。In step 7, it is determined whether a current sudden change or a negative sequence ground current occurs. If yes, the grid-connected control module voltage transformer is disconnected, and the process is exited; otherwise, the process proceeds to step 8.
步骤8，判断是否出现有功功率减小或者超限，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号。In step 8, it is judged whether the active power is reduced or over-limited. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and issues an island signal.
上述电气保护过程中，跳闸命令延时若干秒后发出，避免保护误动作，出现内、外部故障时会发出告警。In the above electrical protection process, the trip command is issued after a delay of several seconds to avoid protection from malfunction, and an alarm will be issued when internal or external faults occur.
本发明解决了模拟负载工作过程中设备自身的电气安全问题和接入电网时的并网安全问题，提高设备自身的安全性，同时，对电池SOC状态的监控有利于提高电池的寿命，有利于V2G过程中储能系统的推广应用。The invention solves the electrical safety problem of the device itself during the simulated load working process and the grid-connected safety problem when the power is connected to the grid, and improves the safety of the device itself. At the same time, monitoring the SOC state of the battery is beneficial to improving the life of the battery, which is beneficial to Popularization and application of energy storage systems in V2G process.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。 The above is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims (3)

  1. 一种电动汽车与电网互动模拟负载系统，其特征在于：包括电池系统、双向AC/DC模块、并网控制保护模块和监控终端；An electric vehicle and grid interactive simulation load system, comprising: a battery system, a bidirectional AC/DC module, a grid connection control protection module and a monitoring terminal;
    所述电池系统包括电池以及与电池连接的电池管理系统，所述监控终端分别与电池管理系统、双向AC/DC模块和并网控制保护模块连接，所述电池管理系统还与双向AC/DC模块连接，所述双向AC/DC模块通过断路器与电网连接，所述双向AC/DC模块还与并网控制保护模块连接，所述并网控制保护模块通过断路器与电网连接。The battery system includes a battery and a battery management system connected to the battery, the monitoring terminal is respectively connected to a battery management system, a bidirectional AC/DC module and a grid connection control protection module, and the battery management system is also connected with a bidirectional AC/DC module. The two-way AC/DC module is connected to the power grid through a circuit breaker, and the two-way AC/DC module is also connected to the grid-connected control protection module, and the grid-connected control protection module is connected to the power grid through the circuit breaker.
  2. 基于权利要求1所述的一种电动汽车与电网互动模拟负载系统的电气保护方法，其特征在于：包括以下步骤，An electrical protection method for an electric vehicle and a grid interactive analog load system according to claim 1, comprising the steps of:
    步骤1，电池管理系统对充电总电流和SOC状况进行测量，并将测量值发送给监控终端；Step 1. The battery management system measures the total charging current and the SOC condition, and sends the measured value to the monitoring terminal;
    步骤2，监控终端判断充电总电流是否超过预设的过流保护阈值，如果是，判定为内部故障，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤3；Step 2: The monitoring terminal determines whether the total charging current exceeds a preset overcurrent protection threshold. If yes, the internal terminal is determined to be an internal fault, and the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker and exit the process; otherwise, go to step 3. ;
    步骤3，监控终端判断SOC状况是否超过预设的SOC工作区间，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，退出流程；否则转至步骤4；Step 3: The monitoring terminal determines whether the SOC condition exceeds a preset SOC working interval, and if so, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and exits the process; otherwise, proceeds to step 4;
    步骤4，双向AC/DC模块对输入的三相电压进行测量，并将测量值发送给监控终端；Step 4: The bidirectional AC/DC module measures the input three-phase voltage, and sends the measured value to the monitoring terminal;
    步骤5，监控终端测量单相功率的大小，判断三相电压是否发送畸变，如果是，则转至步骤6，否则进行外部保护，即监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号，退出流程；Step 5: The monitoring terminal measures the magnitude of the single-phase power, determines whether the three-phase voltage is sent to be distorted, and if yes, proceeds to step 6, otherwise, external protection is performed, that is, the monitoring terminal issues a trip command to the grid-connected protection module to cut off the circuit breaker. And issue an island signal to exit the process;
    步骤6，判断是否采用复合电压起动过电流保护，如果是，则转至步骤7，否则退出流程；Step 6, determine whether to use the composite voltage to initiate overcurrent protection, if yes, go to step 7, otherwise exit the process;
    步骤7，判断是否出现电流突变或者负序地电流，如果是，并网控制保护模块电压互感器断线，退出流程；否则转至步骤8； Step 7, determine whether there is a sudden change in current or negative sequence current, if yes, the grid-connected control module voltage transformer disconnected, exit the process; otherwise, go to step 8;
    步骤8，判断是否出现有功功率减小或者超限，如果是，监控终端向并网保护模块发出跳闸命令，切断断路器，并发出孤岛信号。In step 8, it is judged whether the active power is reduced or over-limited. If yes, the monitoring terminal issues a trip command to the grid-connected protection module, cuts off the circuit breaker, and issues an island signal.
  3. 根据权利要求2所述的一种电动汽车与电网互动模拟负载系统的电气保护方法，其特征在于：跳闸命令延时若干秒后发出。 The electrical protection method for an electric vehicle and grid interactive analog load system according to claim 2, wherein the trip command is issued after a delay of several seconds.
PCT/CN2016/108794 2016-04-26 2016-12-07 Electric automobile and power grid interactive simulation load system and electrical protection method therefor WO2017185756A1 (en)

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