CN108667073A - A photovoltaic anti-islanding method based on dispatching automation system - Google Patents

A photovoltaic anti-islanding method based on dispatching automation system Download PDF

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CN108667073A
CN108667073A CN201810499981.7A CN201810499981A CN108667073A CN 108667073 A CN108667073 A CN 108667073A CN 201810499981 A CN201810499981 A CN 201810499981A CN 108667073 A CN108667073 A CN 108667073A
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automation system
photovoltaic
access point
photovoltaic power
dispatching automation
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潘栋
倪菁
韩洪兴
黄科
沈泓
马海涛
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Changzhou Power Supply Branch Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
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Changzhou Power Supply Branch Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
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Priority to CN201810499981.7A priority Critical patent/CN108667073A/en
Publication of CN108667073A publication Critical patent/CN108667073A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388Islanding, i.e. disconnection of local power supply from the network

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention provides a kind of anti-isolated island method of the photovoltaic based on dispatch automated system, the access module of major network is incorporated to by special line for photovoltaic plant, electric network model and real time data are obtained from dispatch automated system, photovoltaic plant is switched in major network side access point and models and monitors in real time, photovoltaic isolated island whether is formed using electrical island analysis and power supply point trace mode comprehensive descision, and early warning photovoltaic isolated island situation in time, while the major network access point switch in photovoltaic isolated island is cut off by remote control rapidly.The present invention can have found access power grid and form the photovoltaic plant of island effect in time, and the photovoltaic plant to form island effect can be cut off by dispatch automated system far-end remote control, ensure personnel and equipment safety, realize that convenient, at low cost, reliability is preferable.

Description

一种基于调度自动化系统的光伏防孤岛方法A photovoltaic anti-islanding method based on dispatching automation system

技术领域technical field

本发明涉及调度自动化技术领域,具体涉及一种基于调度自动化系统的光伏防孤岛方法。The invention relates to the technical field of scheduling automation, in particular to a photovoltaic anti-islanding method based on a scheduling automation system.

背景技术Background technique

随着新能源建设的不断推进,大量的10kV分布式光伏发电系统陆续接入公共电网,但并未纳入供电部门电力调度实时监控。分布式光伏发电系统的接入极易造成孤岛效应,所谓孤岛效应,简单地说是指公共电网停止供电后,由于存在光伏等分布式并网发电系统且其没能及时与电网脱离,光伏向电网倒送电,导致公共电网中的部分线路依然处于带电状态,从而出现电力自给供应的孤岛。光伏产生孤岛效应时,容易产生安全事故。因此,如何准确及时地识别判断并处理光伏孤岛问题显得十分重要。With the continuous advancement of new energy construction, a large number of 10kV distributed photovoltaic power generation systems have been connected to the public grid one after another, but they have not been included in the real-time monitoring of power dispatching by the power supply department. The connection of distributed photovoltaic power generation system can easily cause the island effect. The so-called island effect simply means that after the public power grid stops supplying power, due to the existence of distributed grid-connected power generation systems such as photovoltaics and their failure to separate from the grid in time, the photovoltaic power generation The reverse transmission of power from the power grid causes some lines in the public power grid to remain live, resulting in isolated islands of self-sufficient power supply. When photovoltaics produce an island effect, safety accidents are prone to occur. Therefore, how to accurately and timely identify and judge and deal with the problem of photovoltaic islanding is very important.

目前常用的孤岛检测方法可分为远程法、本地被动法、本地主动法三大类,各大类又可分为多种不同方法,其中远程法可分为PLCC 法、SPD 法和SCADA 法等;本地被动法可分为电压/频率检测法、电压谐波检测法和电压相位突变检测法等;本地主动法可分为阻抗测量法、电抗插入法、电压偏移法、功率扰动法、主动频率偏移法和滑模频率漂移等。上述方法主要是通过对接入电网的光伏电站的并网逆变器进行监控进而实现对光伏电站的隔离。At present, the commonly used island detection methods can be divided into three categories: remote method, local passive method and local active method, and each category can be divided into many different methods, among which remote method can be divided into PLCC method, SPD method and SCADA method, etc. The local passive method can be divided into voltage/frequency detection method, voltage harmonic detection method and voltage phase mutation detection method, etc.; the local active method can be divided into impedance measurement method, reactance insertion method, voltage offset method, power disturbance method, active Frequency offset method and sliding mode frequency drift, etc. The above method is mainly to realize the isolation of the photovoltaic power station by monitoring the grid-connected inverter of the photovoltaic power station connected to the power grid.

调度自动化系统目前在电力调度工作中得到普遍应用,调度自动化系统已建立电网模型,具有包括网络拓扑分析和潮流计算在内的应用分析功能,能够获取电网运行的实时数据信息,能够基于电网设备连接关系分析电网的电气岛信息,但目前如何利用调度自动化系统来防止光伏电站并入主网所形成的孤岛,尚未见研究。Dispatching automation system is widely used in power dispatching work at present. The dispatching automation system has established a power grid model, which has application analysis functions including network topology analysis and power flow calculation, and can obtain real-time data information of power grid operation. However, how to use the dispatch automation system to prevent the isolated island formed by the integration of photovoltaic power plants into the main grid has not yet been studied.

发明内容Contents of the invention

本发明的目的是:针对现有技术中存在的问题,提供一种基于调度自动化系统实现的光伏防孤岛方法,采用该方法,调控人员能够及时发现接入电网且形成孤岛的光伏电站,并可通过调度自动化系统远端遥控切断形成孤岛效应的光伏电站,保证人员和设备安全。The purpose of the present invention is to provide a photovoltaic anti-islanding method based on the dispatching automation system in view of the problems existing in the prior art. By using this method, the control personnel can find photovoltaic power stations that are connected to the power grid and form islands in time, and can The photovoltaic power station that forms an island effect is cut off remotely through the dispatching automation system to ensure the safety of personnel and equipment.

本发明的技术方案是:本发明的基于调度自动化系统的光伏防孤岛方法,基于调度自动化系统实施,包括以下步骤:The technical solution of the present invention is: the photovoltaic anti-islanding method based on the dispatching automation system of the present invention is implemented based on the dispatching automation system, comprising the following steps:

①建立光伏电站监控模型:在调度自动化系统上对所辖区域内各光伏电站与主配电网连接的接入点开关进行标识,建立各光伏电站的接入点开关与主配电网模型的对应关系;①Establish the photovoltaic power station monitoring model: mark the access point switches of each photovoltaic power station connected to the main distribution network in the dispatching automation system, and establish the connection between the access point switches of each photovoltaic power station and the main distribution network model. Correspondence;

②获取电网模型和实时数据信息:调度自动化系统获取电网模型以及电网运行实时数据信息;②Obtain the power grid model and real-time data information: the dispatching automation system obtains the power grid model and real-time data information of power grid operation;

③获取已建模的光伏电站的接入点开关信息;③ Obtain the access point switch information of the modeled photovoltaic power plant;

④调度自动化系统按照设定的时间周期,基于设备连接关系,定时通过拓扑搜索分析形成电气岛;④The scheduling automation system forms electrical islands regularly through topology search and analysis according to the set time period and based on the equipment connection relationship;

⑤调度自动化系统判断各光伏电站的接入点开关是否在主电气岛内,若是,则返回步骤④;若否,则进入步骤⑥;⑤The dispatch automation system judges whether the access point switch of each photovoltaic power station is in the main electrical island, if so, return to step ④; if not, enter step ⑥;

⑥调度自动化系统追踪不在主电气岛内的光伏电站接入点开关的上级电源点:调度自动化系统按照向潮流流入方向和向高电压等级方向遍历的原则,从该光伏电站接入点开关出发,逐级向上搜索并判断该光伏电站接入点开关最终是否能够追溯至500kV变电站,若是,则返回步骤④;若否,则进入步骤⑦;⑥ The dispatching automation system tracks the upper-level power point of the photovoltaic power station access point switch that is not in the main electrical island: the dispatching automation system follows the principle of traversing in the direction of power flow inflow and in the direction of high voltage level, starting from the photovoltaic power station access point switch, Search upward step by step and judge whether the access point switch of the photovoltaic power station can be traced back to the 500kV substation in the end, if yes, return to step ④; if not, enter step ⑦;

⑦调度自动化系统判断该接入点开关对应的光伏电站形成孤岛,调度自动化系统弹出告警窗报警,同时弹出包括需要切除的接入点开关的遥控操作界面;⑦The dispatching automation system judges that the photovoltaic power station corresponding to the access point switch forms an isolated island, and the dispatching automation system pops up an alarm window to alarm, and at the same time pops up a remote control operation interface including the access point switch that needs to be removed;

⑧调度监控人员通过调度自动化系统的遥控操作界面,发送接入点开关分操作指令,切断形成孤岛的光伏电站。⑧The dispatching and monitoring personnel send access point switch sub-operation instructions through the remote control operation interface of the dispatching automation system to cut off the photovoltaic power plants that form islands.

进一步的方案是:上述步骤②中获取的电网模型信息为包括线路、母线、变压器、开关、刀闸、发电机、负荷在内的电网一次设备的描述信息和拓扑连接关系信息;获取的实时数据信息包括开关、刀闸状态以及线路、母线、变压器、发电机、负荷的有功、无功、电流信息。A further solution is: the power grid model information obtained in the above step ② is the description information and topology connection relationship information of the primary equipment of the power grid including lines, busbars, transformers, switches, switches, generators, and loads; the real-time data obtained The information includes the status of switch and switch, as well as the active power, reactive power and current information of lines, busbars, transformers, generators and loads.

本发明具有积极的效果:本发明的基于调度自动化系统的光伏防孤岛方法,其提供了一种不同于现有技术的防光伏孤岛效应的技术构思和技术方案,采用本发明的方法,调控人员能够及时发现接入电网且形成孤岛效应的光伏电站,并可通过调度自动化系统远端遥控切断形成孤岛效应的光伏电站,保证人员和设备安全,且本发明的方法具有实现方便、成本低、可靠性较好等优势。The present invention has positive effects: the photovoltaic anti-islanding method based on the dispatching automation system of the present invention provides a technical concept and technical solution different from the prior art anti-photovoltaic islanding effect. Using the method of the present invention, the control personnel The photovoltaic power station that is connected to the grid and forms an island effect can be found in time, and the photovoltaic power station that forms an island effect can be cut off remotely through the dispatching automation system to ensure the safety of personnel and equipment, and the method of the present invention has the advantages of convenient implementation, low cost, and reliability Better sex and other advantages.

附图说明Description of drawings

图1为本发明的方法流程示意图。Fig. 1 is a schematic flow chart of the method of the present invention.

具体实施方式Detailed ways

下面结合附图和具体实施方式对本发明作进一步详细的说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

(实施例1)(Example 1)

见图1,本实施例的基于调度自动化系统的光伏防孤岛方法,主要针对通过专线接入配电主网模式的光伏电站设计,基于供电部门的电网调度自动化系统实施,具体包括以下步骤:As shown in Figure 1, the photovoltaic anti-islanding method based on the scheduling automation system in this embodiment is mainly designed for photovoltaic power plants connected to the power distribution main network mode through dedicated lines, and implemented based on the power grid dispatching automation system of the power supply department, specifically including the following steps:

①建立光伏电站监控模型:在调度自动化系统上对所辖区域内各光伏电站与主配电网连接的接入点开关进行标识,建立各光伏电站的接入点开关与主配电网模型的对应关系,即实现主网线路开关和光伏电站的模型映射。①Establish the photovoltaic power station monitoring model: mark the access point switches of each photovoltaic power station connected to the main distribution network in the dispatching automation system, and establish the connection between the access point switches of each photovoltaic power station and the main distribution network model. Correspondence, that is, to realize the model mapping of the main network line switch and the photovoltaic power station.

②获取电网模型和实时数据信息:通过调度自动化系统获取电网模型以及电网运行实时数据信息。电网模型包括线路、母线、变压器、开关、刀闸、发电机、负荷等电网一次设备的描述信息和拓扑连接关系信息;实时数据包括开关、刀闸状态以及线路、母线、变压器、发电机、负荷的有功、无功和电流信息。②Obtain power grid model and real-time data information: Obtain the power grid model and real-time data information of power grid operation through the dispatch automation system. The power grid model includes description information and topological connection relationship information of primary equipment such as lines, busbars, transformers, switches, switches, generators, and loads; real-time data includes switches, switchgear status, and lines, busbars, transformers, generators, and loads. active power, reactive power and current information.

③获取已建模的光伏电站的接入点开关信息;③ Obtain the access point switch information of the modeled photovoltaic power plant;

④调度自动化系统按照设定的时间周期,定时分析电网的电气岛信息。电气岛分析过程为:利用调度自动化系统的高级应用分析功能,基于电网模型的设备连接关系,通过拓扑搜索分析形成电气岛。调度自动化系统分析电网电气岛的方法为现有技术,不做详述。④ The dispatching automation system regularly analyzes the electrical island information of the power grid according to the set time period. The electrical island analysis process is as follows: using the advanced application analysis function of the dispatch automation system, based on the equipment connection relationship of the grid model, the electrical island is formed through topology search and analysis. The method for analyzing the electrical island of the power grid by the dispatching automation system is a prior art and will not be described in detail.

⑤调度自动化系统判断各光伏电站的接入点开关是否在主电气岛内,若是,则返回步骤④;若否,则进入步骤⑥。⑤ The dispatching automation system judges whether the access point switch of each photovoltaic power plant is in the main electrical island, and if so, returns to step ④; if not, proceeds to step ⑥.

⑥调度自动化系统追踪不在主电气岛内的光伏电站接入点开关的上级电源点:调度自动化系统按照向潮流流入方向和向高电压等级方向遍历的原则,从该光伏电站接入点开关出发,逐级向上搜索并判断该光伏电站接入点开关最终是否能够追溯至500kV变电站,若是,则返回步骤④;若否,则进入步骤⑦。⑥ The dispatching automation system tracks the upper-level power point of the photovoltaic power station access point switch that is not in the main electrical island: the dispatching automation system follows the principle of traversing in the direction of power flow inflow and in the direction of high voltage level, starting from the photovoltaic power station access point switch, Search upward step by step and judge whether the access point switch of the photovoltaic power station can be traced back to the 500kV substation. If so, return to step ④; if not, enter step ⑦.

⑦调度自动化系统判断该接入点开关对应的光伏电站形成孤岛,调度自动化系统弹出告警窗报警,同时弹出包括需要切除的接入点开关的遥控操作界面。⑦The dispatching automation system judges that the photovoltaic power station corresponding to the access point switch forms an island, and the dispatching automation system pops up an alarm window to alarm, and at the same time pops up a remote control operation interface including the access point switch that needs to be removed.

⑧调度监控人员通过调度自动化系统的遥控操作界面,发送开关分操作指令,切断形成孤岛的光伏电站。⑧The dispatching and monitoring personnel send switch sub-operation instructions through the remote operation interface of the dispatching automation system to cut off the photovoltaic power plants that form islands.

以上实施例是对本发明的具体实施方式的说明,而非对本发明的限制,有关技术领域的技术人员在不脱离本发明的精神和范围的情况下,还可以做出各种变换和变化而得到相对应的等同的技术方案,因此所有等同的技术方案均应该归入本发明的专利保护范围。The above embodiments are descriptions of specific implementations of the present invention, rather than limitations of the present invention. Those skilled in the relevant technical fields can also make various transformations and changes without departing from the spirit and scope of the present invention. Corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the patent protection scope of the present invention.

Claims (2)

1.一种基于调度自动化系统的光伏防孤岛方法,其特征在于:基于调度自动化系统实施,包括以下步骤:1. A photovoltaic anti-islanding method based on dispatch automation system, characterized in that: implement based on dispatch automation system, comprising the following steps: ①建立光伏电站监控模型:在调度自动化系统上对所辖区域内各光伏电站与主配电网连接的接入点开关进行标识,建立各光伏电站的接入点开关与主配电网模型的对应关系;①Establish the photovoltaic power station monitoring model: mark the access point switches of each photovoltaic power station connected to the main distribution network in the dispatching automation system, and establish the connection between the access point switches of each photovoltaic power station and the main distribution network model. Correspondence; ②获取电网模型和实时数据信息:调度自动化系统获取电网模型以及电网运行实时数据信息;②Obtain the power grid model and real-time data information: the dispatching automation system obtains the power grid model and real-time data information of power grid operation; ③获取已建模的光伏电站的接入点开关信息;③ Obtain the access point switch information of the modeled photovoltaic power plant; ④调度自动化系统按照设定的时间周期,基于设备连接关系,定时通过拓扑搜索分析形成电气岛;④The scheduling automation system forms electrical islands regularly through topology search and analysis according to the set time period and based on the equipment connection relationship; ⑤调度自动化系统判断各光伏电站的接入点开关是否在主电气岛内,若是,则返回步骤④;若否,则进入步骤⑥;⑤The dispatch automation system judges whether the access point switch of each photovoltaic power station is in the main electrical island, if so, return to step ④; if not, enter step ⑥; ⑥调度自动化系统追踪不在主电气岛内的光伏电站接入点开关的上级电源点:调度自动化系统按照向潮流流入方向和向高电压等级方向遍历的原则,从该光伏电站接入点开关出发,逐级向上搜索并判断该光伏电站接入点开关最终是否能够追溯至500kV变电站,若是,则返回步骤④;若否,则进入步骤⑦;⑥ The dispatching automation system tracks the upper-level power point of the photovoltaic power station access point switch that is not in the main electrical island: the dispatching automation system follows the principle of traversing in the direction of power flow inflow and in the direction of high voltage level, starting from the photovoltaic power station access point switch, Search upward step by step and judge whether the access point switch of the photovoltaic power station can be traced back to the 500kV substation in the end, if yes, return to step ④; if not, enter step ⑦; ⑦调度自动化系统判断该接入点开关对应的光伏电站形成孤岛,调度自动化系统弹出告警窗报警,同时弹出包括需要切除的接入点开关的遥控操作界面;⑦The dispatching automation system judges that the photovoltaic power station corresponding to the access point switch forms an isolated island, and the dispatching automation system pops up an alarm window to alarm, and at the same time pops up a remote control operation interface including the access point switch that needs to be removed; ⑧调度监控人员通过调度自动化系统的遥控操作界面,发送接入点开关分操作指令,切断形成孤岛的光伏电站。⑧The dispatching and monitoring personnel send access point switch sub-operation instructions through the remote control operation interface of the dispatching automation system to cut off the photovoltaic power plants that form islands. 2.根据权利要求1所述的基于调度自动化系统的光伏防孤岛方法,其特征在于:所述步骤②中获取的电网模型信息为包括线路、母线、变压器、开关、刀闸、发电机、负荷在内的电网一次设备的描述信息和拓扑连接关系信息;获取的实时数据信息包括开关、刀闸状态以及线路、母线、变压器、发电机、负荷的有功、无功、电流信息。2. The photovoltaic anti-islanding method based on dispatching automation system according to claim 1, characterized in that: the grid model information obtained in the step ② includes lines, busbars, transformers, switches, knife gates, generators, loads Descriptive information and topological connection relationship information of the primary equipment of the power grid; the real-time data information obtained includes the status of switches, switches, and active power, reactive power, and current information of lines, busbars, transformers, generators, and loads.
CN201810499981.7A 2018-05-23 2018-05-23 A photovoltaic anti-islanding method based on dispatching automation system Pending CN108667073A (en)

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