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CN103825363A - Wind-solar low voltage storage micro-grid group protection coordinating controller - Google Patents

Wind-solar low voltage storage micro-grid group protection coordinating controller Download PDF

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CN103825363A
CN103825363A CN201410067450.2A CN201410067450A CN103825363A CN 103825363 A CN103825363 A CN 103825363A CN 201410067450 A CN201410067450 A CN 201410067450A CN 103825363 A CN103825363 A CN 103825363A
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grid group
grid
controller
switch
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CN103825363B (en
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王江波
高春凤
杨仁刚
陈卫东
王文成
井天军
全雯琳
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China Agricultural University
Guangxi Power Grid Co Ltd
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China Agricultural University
Guangxi Power Grid Co Ltd
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Abstract

本发明涉及一种风光储低压微网群保护协调控制器，包括微网群保护控制器,微网群公共节点开关，微网群出线首、末端开关，以及微电网控制器；在微网群发生故障时，其微网群保护控制器及微电网控制器通过控制微网群公共节点开关，微网群出线首、末端开关，使整个微网群，以及与其连接的配电网系统的继电保护装置及安全自动装置可以安全可靠地运行。本发明所述一种风光储低压微网群保护协调控制器可广泛的应用于现在的配电网系统及其微网群之间。

The invention relates to a protection coordination controller of a low-voltage micro-grid group for wind-solar storage, including a micro-grid group protection controller, a micro-grid group public node switch, a micro-grid group outlet head and end switch, and a micro-grid controller; in the micro-grid group When a fault occurs, its micro-grid group protection controller and micro-grid controller control the public node switch of the micro-grid group, the outlet head and end switches of the micro-grid group, so that the relay of the entire micro-grid group and the distribution network system connected to it Electric protection devices and safety automatic devices can operate safely and reliably. The wind-solar-storage low-voltage micro-grid group protection coordination controller described in the present invention can be widely applied to current distribution network systems and their micro-grid groups.

Description

A kind of wind-light storage low pressure microgrid group protection coordination controller
Technical field
The invention belongs to micro-electric power network technique field, be specifically related to a kind of wind-light storage low pressure microgrid group protection coordination controller.
Background technology
Power system relay protection device is the important component part of electric power system, and it plays very important effect to guaranteeing system safety operation.The relaying protection of tradition distribution network system; conventionally be configured to syllogic current protection; as transient current fast tripping protection, in limited time current quick-breaking and Timed current-limiting protection; all do not access any power supply as basic engineering take distribution network system and user's side; its trend is from power supply to user's one-way flow; current relay is installed in the design of system protection conventionally at outlet circuit place of transformer station, install auto recloser on main feeder.
But, along with photovoltaic generation, wind power generation, miniature gas turbine generating distributed power supply are in the input of distribution network system, cause original radial passive network to become an active network that is distributed with middle-size and small-size power supply, trend also no longer uniaxially flow to each load from substation bus bar, thereby changed distribution network system short circuit current distribute.The variation that distribution network system structure occurs, makes the various protection definite values of power distribution network and mechanism that change occur, and will likely cause relaying protection and automatic safety device sensitivity to reduce, and protection range dwindles, and incorrect operation even protective device loses selectivity.
Micro-electrical network refers to by distributed power source, energy storage device, energy converter, relevant load and monitoring, protective device and collects the small-sized electric system of being transported to forming; be one and can realize the autonomous system that oneself controls, protects and manage; both can be incorporated into the power networks with large electrical network, also can isolated operation.Existing research and practice shows, distributed power source is accessed to traditional electrical network with the form of micro-electrical network and be incorporated into the power networks, and supports each other with large electrical network, is the effective means of performance distributed electrical source efficiency.
Therefore; be necessary to study novel protection coordination control device for microgrid group; make whole microgrid group; and the protective relaying device of connected distribution network system and automatic safety device can move safely and reliably; avoid changing and causing the various protection definite values of power distribution network and mechanism to change by distribution network system structure; cause relaying protection and automatic safety device sensitivity to reduce, protection range dwindles, and incorrect operation even protective device loses selectivity.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is exactly how to make the protective relaying device of microgrid group and connected distribution network system and automatic safety device move safely and reliably.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of wind-light storage low pressure microgrid group protection coordination controller, comprising: microgrid group protection controller; Microgrid group common node switch, is connected with higher level's power distribution network and microgrid group bus; Microgrid group outlet head end switch, is connected with micro-electrical network outlet circuit and microgrid group bus; Microgrid group outlet end switch, is connected with micro-grid power transmission circuit and single micro-electrical network bus; And micro-power system controller, be connected with microgrid group outlet end switch.
Wherein said microgrid group protection controller, with microgrid group common node switch, microgrid group outlet head end switch, microgrid group outlet end switch, and micro-power system controller connects by connection.
The tripping of wherein said microgrid group protection controller control microgrid group common node switch, microgrid group outlet head end switch and reclosing action.
The tripping of wherein said micro-power system controller control microgrid group outlet end switch and reclosing action.
Preferably, described microgrid group protection controller comprises network service control module and local device information data processing module, for carry out transmitting-receiving control and the data processing of lower DBMS by network; Microgrid group protects and controls policy of Central Government unit, its according to microgrid group switch state, load condition, distributed power source generating state and and net state, issue control command to subordinate's communication module; Micro-grid generation power computation module, maximum/minimum load power computation module, current protection setting value computing module, the quick-break setting value computing module of prescribing a time limit; each computing module coupling system operation real time data and historical data are calculated; they protect control policy of Central Government unit to be connected with microgrid group, and send result of calculation to policy of Central Government unit.
Preferably, microgrid group common node switch is a high-speed switch, is receiving tripping after the isolated island detection information of microgrid group protection controller broadcast, carries out reclosing action after receiving the normal information of circuit; Microgrid group outlet head end switch has short-circuit protection, the function of fast tripping protection, overcurrent protection in limited time, accepts tripping after the fault trip information of microgrid group protection controller broadcast, carries out reclosing action after receiving the normal information of circuit; After the microgrid group outlet end switch isolated island detection information that in micro-electrical network, energy-storage units control terminal RTU transmits under receiving it, by micro-power system controller, by given time delay tripping, this time delay is adjusted and is issued by microgrid group protection controller.
Preferably; described microgrid group common node switch reclosures is adjusted and is issued by microgrid group protection controller operate time; it is less than microgrid group outlet head end switch tripping time and microgrid group outlet end switch tripping time; object is that the current quick of microgrid group outlet head end switch and the current quick of microgrid group outlet end switch can not move during the action of common node switch reclosures.
(3) beneficial effect
Wind-light storage low pressure microgrid group protection coordination controller of the present invention is based on local microenvironment electrical network electric information, micro-electrical network group common node switch electric information and microgrid group outlet head end switch electric information, numerous protective relaying devices in microgrid group are carried out to overall coordination control, in the time that micro-electrical network group breaks down, its microgrid group protection coordination controller can guarantee that protective relaying device disconnects in time, guarantees the safety of subordinate's circuit; Be short-circuited at higher level's circuit, open circuit, when the fault such as ground connection, disconnect in time and being connected of power distribution network, guarantee that micro-electrical network group does not produce short circuit current increment to higher level's abort situation, the safety of assurance distribution network system; By microgrid group outlet end switch electric information, guarantee the stable operation of single micro-electrical network internal security.Thereby make on the whole, the protective relaying device of microgrid group and connected distribution network system and automatic safety device to move safely and reliably.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below,
Apparently, the accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, is not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1: the structural principle block diagram of a kind of wind-light storage low pressure microgrid group protection coordination controller provided by the invention;
Fig. 2: the modular structure block diagram of microgrid group protection controller;
Fig. 3: a kind of wind-light storage low pressure microgrid group protection coordination controller exemplary operation scene provided by the invention 1 structure chart;
Fig. 4: a kind of wind-light storage low pressure microgrid group protection coordination controller exemplary operation scene provided by the invention 2 structure charts;
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples are used for illustrating the present invention, but can not be used for limiting the scope of the invention.
As shown in Figure 1, the present embodiment discloses a kind of wind-light storage low pressure microgrid group protection coordination controller, comprising: microgrid group protection controller MGSC; Microgrid group common node K switch pCCG, be connected with higher level's power distribution network and microgrid group bus; Microgrid group outlet head end K switch ln, be connected with micro-electrical network outlet circuit and microgrid group bus; Microgrid group outlet end switch K pCC_MGn, be connected with micro-grid power transmission circuit and single micro-electrical network bus; And micro-power system controller MGC n.
Wherein, microgrid group protection controller MGSC, with microgrid group common node K switch pCCG, microgrid group outlet head end K switch ln, end switch K pCC_MGn, and micro-power system controller MGC nconnect by connection, for controlling the switching of microgrid group protective relaying device.
K in Fig. 1 pCCGfor microgrid group common node switch, be a high-speed switch, by the control of microgrid group protection controller, receive tripping after the isolated island detection information of its broadcast, and can carry out reclosing operation according to the transmitting order to lower levels of microgrid group protection controller MGSC.Microgrid group common node K switch pCCGreclosing is adjusted and is issued by microgrid group protection controller operate time.
K in Fig. 1 lnit is the head end switch that n microgrid is connected with microgrid group outlet; there is short-circuit protection, in limited time fast tripping protection, overcurrent protection; can accept the fault trip information of microgrid group protection controller broadcast, and carry out reclosing operation according to the transmitting order to lower levels of microgrid group protection controller MGSC.
K in figure pCC_MGnbe the end switch that n microgrid is connected with microgrid group outlet, this high-speed switch is by this micro-power system controller MGC ncontrol, also there is local island protect function in micro-electrical network, after the isolated island detection information that in micro-electrical network, energy-storage units control terminal RTU transmits under receiving it, by micro-power system controller MGC nby given time delay tripping.This time delay is adjusted and is issued by microgrid group protection controller MGSC, and object is to avoid microgrid group protection controller MGSC reclosing operate time.
Described microgrid group common node K switch pCCGreclosing is less than microgrid group outlet head end K switch operate time lncurrent quick-breaking operate time, object is in common node K switch pCCGduring reclosing action, microgrid group outlet head end K switch lncurrent quick can not move.
Described microgrid group protection controller MGSC as shown in Figure 2, comprises network service control module and microgrid group local device information data processing module, for carry out transmitting-receiving control and the data processing of lower DBMS by network; Microgrid group protects and controls policy of Central Government unit, its according to microgrid group switch state, load condition, distributed power source generating state and and net state, issue control command to subordinate's communication module; Micro-grid generation power computation module, maximum/minimum load power computation module, current protection setting value computing module, the quick-break setting value computing module of prescribing a time limit; each computing module coupling system operation real time data and historical data are calculated; they protect control policy of Central Government unit to be connected with microgrid group, and send result of calculation to policy of Central Government unit.
When in microgrid group, transmission line breaks down, this wind-light storage low pressure microgrid protection coordination controller can guarantee that protective relaying device disconnects in time, guarantees the safety of subordinate's circuit; Be short-circuited at higher level's circuit, when the fault such as ground connection, can disconnect in time and being connected of higher level's power distribution network, guarantee that microgrid group does not produce short circuit current increment to higher level's abort situation, guarantees the safety of higher level's distribution network system.The network communication means that this wind-light storage low pressure microgrid protection coordination controller is taked high efficient and flexible, realize the data quick exchange between microgrid group, optimize micro-operation of power networks state, improve the reliability of distribution network system.
The microgrid group protection coordination control program proposing below in conjunction with accompanying drawing explanation the present invention, by two typical fault scene explanation embodiments.
Wind-light storage low pressure microgrid group protection coordination controller exemplary operation scene 1:
As shown in Figure 3, when micro-electrical network 1 outlet circuit is short-circuited or earth fault, this transmission line short circuit current increases rapidly.
Step 1, micro-power system controller MGC 1detect that micro-electrical network 1 outlet transmission line is abnormal, energy storage device discharge power increases fast, and micro-power system controller starts local island protect function, by micro-electrical network 1 outlet end switch K pCC_MG1disconnect, reduce short circuit current increment.
Step 2, microgrid group protection controller MGSC starts microgrid outlet transient current fast tripping protection and time limit current quick break protection, disconnects micro-electrical network 1 outlet head end K switch l1.
Step 3, microgrid group protection controller MGSC monitors outlet switch place, each road electric current, normal if each line current recovers, and starts micro-electrical network 1 outlet head end K switch l1reclosing; If still irregular operating, disconnects microgrid group common node K switch pCCG.
Step 4, if micro-electrical network 1 outlet head end K switch l1reclosing success, micro-electrical network 1 outlet end switch K pCC_MG1time delay is grid-connected, and this time delay is adjusted by microgrid group protection controller MGSC, avoids microgrid group protection controller MGSC reclosing operate time; If micro-electrical network 1 outlet head end K switch l1reclosing is unsuccessful, micro-electrical network 1 islet operation.
Wind-light storage low pressure microgrid group protection coordination controller exemplary operation scene 2:
As shown in Figure 4, when microgrid group higher level distribution line is short-circuited or earth fault, this distribution transmission line short circuit current increases rapidly.
Step 1, microgrid group protection controller MGSC detects power distribution network side transmission line current anomaly, and microgrid group increases fast to distribution side feed power, and microgrid group protection controller MGSC disconnects rapidly microgrid group common node K switch pCCG, the reverse increasing-aid current of the generation of elimination microgrid group to short trouble place, avoids the tripping of higher level's line protective devices.
Step 2, microgrid group protection controller MGSC monitors micro-electrical network and goes out line current, recovers normal if each road goes out line current, starts microgrid group common node K switch pCCGreclosing; If still irregular operating, microgrid group protection controller MGSC disconnects microgrid group outlet head end K switch l1～K ln, micro-power system controller MGC 1～MGC ndisconnect microgrid group outlet end switch K pCC_MG1～K pCC_MGn, each micro-electrical network independent operating.
Step 3, microgrid group common node K switch pCCGreclosing success, microgrid group and power distribution network are incorporated into the power networks; If K pCCGreclosing is unsuccessful, microgrid group islet operation.Microgrid group common node K switch pCCGreclosing is adjusted by microgrid group protection controller MGSC operate time, and its value is less than microgrid group outlet head end K switch lncurrent quick-breaking operate time.
The protection coordination controller of the present embodiment wind-light storage low pressure microgrid group design, than single micro-electric network protection controller, protection range is larger; power supply capacity in group is large; between micro-electrical network, exert oneself and easily form mutually and support, operational mode is more flexible, and power supply reliability is stronger.Common node switch, micro-electrical network outlet head end switch and outlet end switch three-level protective device are set in wind-light storage low pressure microgrid group; unify to control by microgrid group protection coordination controller, solved because of the power on problem of the protective device incorrect operation that produces of stream two-way flow of micro-grid power transmission circuit.
Wind-light storage low pressure microgrid protection coordination controller adopts communication system and reliably control structure flexibly, has reduced the control complexity of protective device.
Above execution mode is only for the present invention is described, but not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.

Claims (4)

1.一种风光储低压微网群保护协调控制器，其特征在于，包括：微网群保护控制器；微网群公共节点开关，与上级配电网和微网群母线连接；微网群出线首端开关，与微电网出线线路和微网群母线连接；微网群出线末端开关，与微电网输电线路和单个微电网母线连接；以及微电网控制器，与微网群出线末端开关连接；1. A wind-solar-storage low-voltage micro-grid group protection coordination controller, characterized in that it includes: a micro-grid group protection controller; a micro-grid group public node switch, connected to the upper-level distribution network and the micro-grid group bus; the micro-grid group The outlet head switch is connected to the microgrid outlet line and the microgrid group busbar; the microgrid group outlet end switch is connected to the microgrid transmission line and a single microgrid busbar; and the microgrid controller is connected to the microgrid group outlet end switch ; 所述微网群保护控制器，与微网群公共节点开关、微网群出线首端开关、微网群出线末端开关，以及微电网控制器通过通讯线连接；The micro-grid group protection controller is connected to the micro-grid group public node switch, the micro-grid group outgoing line head-end switch, the micro-grid group outgoing line end switch, and the micro-grid controller through a communication line; 所述微网群保护控制器控制微网群公共节点开关、微网群出线首端开关的跳开和重合闸动作；The micro-grid group protection controller controls the tripping and reclosing actions of the public node switch of the micro-grid group and the head-end switch of the micro-grid group; 所述微电网控制器控制微网群出线末端开关的跳开和重合闸动作。The micro-grid controller controls the tripping and reclosing actions of the outlet end switches of the micro-grid group. 2.根据权利要求1所述的风光储低压微网群保护协调控制器，其特征在于，所述微网群保护控制器包括网络通信控制模块和本地设备信息数据处理模块，用于通过网络进行下级数据的收发控制和数据处理；微网群保护控制中央决策单元，其根据微网群开关状态、负荷状态、分布式电源发电状态和并网状态，向下级通讯模块下发控制指令；微电网发电功率计算模块、最大/最小负荷功率计算模块、电流保护整定值计算模块、限时速断整定值计算模块，所述计算模块结合系统运行实时数据和历史数据进行计算，它们与微网群保护控制中央决策单元相连，并将计算结果传送给中央决策单元。2. The wind-solar-storage low-voltage micro-grid group protection coordination controller according to claim 1, characterized in that, the micro-grid group protection controller includes a network communication control module and a local device information data processing module for Sending and receiving control and data processing of lower-level data; the central decision-making unit of micro-grid group protection control, which sends control instructions to the lower-level communication module according to the switch status, load status, distributed power generation status and grid-connected status of the micro-grid group; Generating power calculation module, maximum/minimum load power calculation module, current protection setting value calculation module, and time-limited quick-break setting value calculation module. The calculation modules combine real-time data and historical data of system operation for calculation. The decision-making units are connected and the calculation results are transmitted to the central decision-making unit. 3.根据权利要求1所述的风光储低压微网群保护协调控制器，其特征在于，微网群公共节点开关在收到微网群保护控制器广播的孤岛检测信息后跳开，收到电路正常的信息后执行重合闸动作；微网群出线首端开关接受微网群保护控制器广播的故障跳闸信息后跳开，收到电路正常的信息后执行重合闸动作；微网群出线末端开关在收到其所属微电网内储能单元控制终端RTU传来的孤岛检测信息后，由微电网控制器按给定延时跳开，该延时由微网群保护控制器整定并下发。3. The wind-solar-storage low-voltage micro-grid group protection coordination controller according to claim 1, wherein the public node switch of the micro-grid group jumps off after receiving the island detection information broadcast by the micro-grid group protection controller, and receives After receiving the normal information of the circuit, the reclosing action is executed; the switch at the head end of the micro-grid group outgoing line jumps off after receiving the fault trip information broadcast by the micro-grid group protection controller, and executes the reclosing action after receiving the normal information of the circuit; the terminal of the micro-grid group outgoing line After the switch receives the island detection information from the energy storage unit control terminal RTU in the microgrid to which it belongs, the microgrid controller jumps off according to a given delay, which is set and issued by the microgrid group protection controller . 4.根据权利要求3所述的风光储低压微网群保护协调控制器，其特征在于，所述微网群公共节点开关重合闸动作时间小于微网群出线首端开关跳开时间以及微网群出线末端开关延时跳开时间。4. The wind-solar-storage low-voltage micro-grid group protection coordination controller according to claim 3, characterized in that, the reclosing action time of the public node switch of the micro-grid group is less than the tripping time of the outlet head end switch of the micro-grid group and the micro-grid Delay tripping time of the end switch of the group outgoing line.
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CN105470933B (en) * 2015-11-27 2018-08-21 宁波三星医疗电气股份有限公司 A kind of power distribution network DTU protection algorisms of access distributed generation resource
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