WO2015143846A1 - Online real-time loop closing method based on integration of main network and distribution network - Google Patents

Online real-time loop closing method based on integration of main network and distribution network Download PDF

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WO2015143846A1
WO2015143846A1 PCT/CN2014/086180 CN2014086180W WO2015143846A1 WO 2015143846 A1 WO2015143846 A1 WO 2015143846A1 CN 2014086180 W CN2014086180 W CN 2014086180W WO 2015143846 A1 WO2015143846 A1 WO 2015143846A1
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Prior art keywords
distribution network
network
loop
main
flow calculation
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PCT/CN2014/086180
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French (fr)
Chinese (zh)
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张玉林
赵仰东
孙大雁
韩韬
吴奕
苏大威
朱海兵
杜红卫
张佳琪
赵浚婧
代鹏
崔玉
萨其日娜
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国家电网公司
国电南瑞科技股份有限公司
江苏省电力公司
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Publication of WO2015143846A1 publication Critical patent/WO2015143846A1/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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Definitions

  • the invention relates to an online real-time ring-closing method based on integration of a main distribution network.
  • the current closed-loop operation is often judged according to the experience of the operating personnel. However, the structure and state of the higher-voltage power supply system are changed, and the operation of this level is not easy to fully grasp. This makes the current closed-loop operation lack powerful theory and analysis, which is easy. A judgment deviation occurs, causing a trip. This will undoubtedly increase the number of power outages and reduce the reliability and economy of the system.
  • the present invention provides an online real-time ring-closing method based on integration of a primary distribution network, which acquires models and real-time data online in an EMS system and a DMS system, respectively, and interacts the calculation results through an information exchange bus, so that the operation is performed.
  • the combined power flow calculation unit or program on the PAS server of the DMS system and the energy management system (EMS system) simultaneously obtains the iterative calculation of the model and data of the main network and the distribution network, which greatly improves the calculation accuracy and facilitates the trend of the loop.
  • the operation and maintenance of a calculation unit or program is based on integration of a primary distribution network, which acquires models and real-time data online in an EMS system and a DMS system, respectively, and interacts the calculation results through an information exchange bus, so that the operation is performed.
  • the combined power flow calculation unit or program on the PAS server of the DMS system and the energy management system (EMS system) simultaneously obtains the iterative calculation of the model and data of the main network and the distribution
  • An online real-time ring-closing method based on integration of a primary distribution network comprising the following steps:
  • S01 Network modeling: The distribution automation system imports the main network model from the EMS system, imports the 10kV distribution network model from the PMS system or the GIS system, splicing the main network and the distribution network model, and constructing an integrated main distribution network physical model, automatically Topological search converts the physical model into a computational model;
  • Loop search and phase check According to the closed loop parameters and the grid operation mode in the real-time database of the PAS application, the automatic topology search of the main network obtains the topology information of the closed loop, and the topology connection relationship and the transformer in the loop. The phase of the branch wiring mode is verified until the topology searches for the shortest loop path;
  • S04 Compatible power flow calculation: The main network EMS system calculates the impedance of the joint port and transmits it to the distribution network and the power flow calculation unit. After the automatic topology search, the initial power flow calculation before the loop is performed to the iterative convergence, and the two sides of the contact switch are obtained. The voltage vector difference is calculated, and the steady-state current and the combined inrush current value of the tie switch are calculated. At the same time, the distribution of the combined impact current on the other branch devices is calculated, that is, the current of other branch switches at the moment of the ring is calculated. value;
  • the steady-state load calculation unit equalizes the influence of the combined impact current to the change of the active and reactive injection quantities of the logic bus bars at both ends of the closed-loop branch, that is, the closed-loop branch is disconnected, in the closed-loop branch
  • the first end of the pair increases and decreases the value of the combined impact current, and calculates the influence of the combined impact current on the other branch devices of the whole system until convergence;
  • S05 Risk assessment of the closed loop: After the completion of the calculation of the combined power flow, it is determined whether the inrush current exceeds the protection of the switch when the system has a closed loop. If there is, the system gives an unreasonable warning of the closed loop, otherwise the loop can be performed. operating.
  • the distribution automation system When performing the loop operation, a large circulation may occur, which will directly affect the safety and stability of the grid. Scheduled to run. Based on the powerful EMS system and DMS system, the distribution automation system reads the model and measurement data of the distribution network for pre- and post-loop power flow calculation analysis, and the main network side port required for the mixed-loop load calculation. The value impedance and the voltage phase angle of the bus voltage in the 10kV station are calculated by the EMS system. The power distribution automation system combined power flow calculation unit or program sends a calculation request to the EMS system interface.
  • the EMS system When the EMS system receives the calculation request, it calls the power flow calculation program and sends the calculation result to the
  • the power distribution automation system combined with the power flow calculation unit or program realizes integrated calculation based on the main distribution network model, which greatly improves the calculation accuracy and facilitates the operation and maintenance of the combined power flow calculation unit or program.
  • the system sorts the ratio of the current and the protection current of the switch protection when the ring is closed, and gives a dangerous point that will occur when the system is closed. It helps the operators to make appropriate adjustments to the regional power network, which will provide a theoretical reference for the dispatch operation mode and assist decision-making to ensure the user's interests and reduce power outage losses.
  • the invention has the beneficial effects that the model and the real-time data are acquired online in the EMS system and the DMS system respectively, and the calculation results are exchanged through the information exchange bus, so that the combined power flow calculation on the PAS server of the DMS system and the energy management system is performed.
  • the unit or program obtains the model and data of the main network and the distribution network for alternate iterative calculation, which greatly improves the calculation accuracy and facilitates the operation and maintenance of the combined power flow calculation unit or program.
  • FIG. 1 is a flow chart of an online real-time ring-closing method based on integration of a primary distribution network according to the present invention
  • an online real-time ring-closing method based on integration of a primary distribution network includes the following steps:
  • S01 Network Modeling: The distribution automation system imports the main network model from the EMS system, and imports the 10kV distribution network model from the PMS system (production management system) or GIS system, splicing the main network and the distribution network model to construct an integrated main distribution.
  • the network physical model, automatic topology search converts the physical model into a computational model.
  • the model is divided into a physical model and a computational model.
  • the physical model is divided into a user-oriented relational model and an analytical-oriented hierarchical model.
  • the computational model is a model that forms the characteristics of the circuit structure.
  • Network modeling implements the mapping of relational models to hierarchical models. In the physical modeling process, the splicing of the multi-region main network model data and the distribution network model data is realized. Physical modeling can accurately, completely and efficiently describe all electrical components in the distribution network model and their connection relationships and parameters.
  • Network modeling includes the import of models and the splicing of models, where:
  • Model import The model is established to establish the mapping relationship between the source device and the internal device, and establish a hierarchical mapping relationship between the internal devices.
  • a device model is formed according to the hierarchical structure of power system resources to form several classes.
  • a device type defines a class, a device is a separate class object, each device forms a two-dimensional relation table, and the relation table is stored in a relational database.
  • Model splicing When the model is imported from the PMS system or GIS system to the distribution automation system, the main and distribution network models are spliced together to form a complete topology connection relationship. All equipment tables and parameter tables, calculation result tables are stored in commercial databases.
  • Url GZt4t543m2cxe15FLPYpFOhfV-7B5X3DuvI3 57_tSUY0VWElDt_xjJRe5KhIKSkHmz5U-5cTEaHOL7OI_xt1b1GcuJYmMopi4z17Kkn7 6Vi , and will not be described here.
  • the server uses some tables, the device information stored in the commercial library on the data server is downloaded to each application server, and a real-time database is established.
  • the topology analysis class is a common module of the distribution network analysis application software, and can be used as a stand-alone application. Preliminary analysis results can also be provided for other applications for further analysis. Its main function is to determine the real-time network structure by analyzing the connection relationship and operation mode of each electrical component of the distribution network.
  • the network topology realizes the conversion of the physical model to the calculation model: the zero-impedance branch such as bus, switch, knife gate, load and other equipment are combined into one node at the same voltage node, and the non-zero impedance branch such as transformer, line and other devices are processed as
  • the branch road eventually forms an abstract mathematical calculation model with only nodes and branches.
  • the model conversion function is automatically triggered when the system detects a change in the switch state.
  • the development of the network topology part of the EMS system is to use the hierarchical library model of SS40.
  • the development of the network topology part of the DMS system is to form a dynamic library call.
  • the network topology forms the original model information, and establishes source device and internal device mapping, static device connection relationship, and dynamic device connection relationship.
  • the model of the distribution automation system covers the main network and the distribution network, including the 10kV distribution network pattern data and the EMS system upper-level grid pattern data.
  • the 10kV distribution network model data is obtained from the PMS system or the GIS system.
  • the main network model is obtained from the EMS.
  • the main assembly and distribution network model splicing and the model dynamic change management function are completed in the distribution automation system, and a complete distribution network analysis application model is constructed.
  • S02 Main distribution network measurement and reading: Advanced applications such as EMS system and DMS system state estimation and power flow calculation provide good basic conditions for the combined power flow calculation system.
  • the initial section data of the combined power flow calculation system (section data is all the equipment measurement data and switch status data of the power network at a certain point in time) may be derived from the real-time state estimation module, or may be derived from the power flow calculation module, or may be sourced. In the historical data section.
  • the historical data section can be obtained from the CASE management system, or the relevant equipment parameters, distribution network load history data and historical curve of the medium voltage distribution network (including 10kV, 20kV) can be obtained from the production management system (PMS system) through the information exchange bus. .
  • the feeder single-line diagram and network topology of the medium-voltage distribution network are obtained from the production management system (PMS) or the grid GIS platform.
  • the information exchange bus obtains the network topology, related equipment parameters, real-time data and historical data of the high-voltage distribution network (including 35kV, 110kV) from the upper-level scheduling (generally referred to as regional dispatching) automation system, and obtains the main distribution network data by using E language.
  • the loop program (all the previous functional modules, that is, all the related program loops, calculations, etc., collectively referred to as the loop program, including topology analysis and closed-loop load flow calculation), read the model data from the real-time database as needed to establish a distribution network model.
  • the device connection relationship is read to form a topology search, and the real-time data is read to participate in the power flow calculation.
  • the program is arranged in the main network EMS (ie, The main network port equivalent impedance calculation interface program) is calculated in the main network and then the calculation result is transmitted to the distribution network and the power flow program for the combined power flow calculation. It not only ensures the accuracy of calculation, but also facilitates program maintenance and is convenient to use.
  • the topology connection relationship check is performed first:
  • connection relationship check includes: no node number, node number error, node empty.
  • Parameter checking includes missing parameters, parameter errors, and deviations from normal values.
  • test results are classified into severe (error) and non-critical (alarm), and cannot be copied to the state estimate when there is an error. Whether it is serious or not, find out why.
  • step S01 the type of verification, whether it is sorted seriously, and the next step is verified after the verification is correct. Check, otherwise return to step S01.
  • the whole network topology search is performed, and the line parameters and the power values of the distribution network transformer and its distribution network load are read from the real-time database during the search process. If the ring network is searched, the ring network exists. If the search fails, the ring network does not exist.
  • Phase sequence and phase consistency are necessary conditions for the two outgoing lines of the same power supply or the loop between the ring networks. Without the phase sequence and phase inspection, the loop operation will bring serious impact to the system. Therefore, the open-loop points of all 10 kV switches must pass the "phase sequence, phase" check, that is, ensure that the phases of the power supply on both sides of the open-loop point are correctly matched, and the connection groups participating in the closed-loop transformer are consistent. For the wiring mode of the transformer winding in the ring, the combined power flow calculation module will check. If there is a phase difference in the ring, the system will give an unreasonable prompt.
  • S04 Compatible power flow calculation: The main network EMS system calculates the impedance of the joint port and transmits it to the distribution network and the power flow calculation unit. After the automatic topology search, the initial power flow calculation before the loop is performed to the iterative convergence, and the two sides of the contact switch are obtained. The voltage vector difference is calculated, and the closed-loop steady-state current and the combined-current impulse current value of the tie switch are calculated. At the same time, the distribution of the combined impact tidal current on other branch devices is calculated, that is, other branches are calculated (other branches are combined The branch path has an electrical connection branch. The current value of the switch at the moment of the ring connection. For the specific calculation steps, refer to the prior art.
  • the steady-state load flow calculation unit equalizes the influence of the combined ring surge current to the change of the active and reactive injection quantities of the logic bus bars at both ends of the closed-loop branch, that is, the closed-loop branch is disconnected, at the head end of the closed-loop branch
  • the injection quantity is increased and decreased respectively, and the value of the combined impact current is calculated, and the influence of the combined impact current on the other branch devices of the whole system is calculated until the iteration converges.
  • the loop operation will cause the power flow in the original power supply area to change.
  • the combined power flow calculation unit or program gives the maximum combined ring surge current and the closed-loop steady-state current when the switch is closed, and analyzes the results of the safety check.
  • S05 Risk assessment of the closed loop: After the completion of the calculation of the combined power flow, it is determined whether the inrush current exceeds the protection of the switch when the system has a closed loop. If there is, the system gives an unreasonable warning of the closed loop, otherwise the loop can be performed. operating. When the inrush current exceeds the switch protection action when the whole system is not closed, the system sorts the ratio of the current and the switch protection action current when the ring is closed, and gives the dangerous point that will occur when the system is closed. It helps the operators to make appropriate adjustments to the regional power network, which will provide a theoretical reference for the dispatch operation mode and assist decision-making to ensure the user's interests and reduce power outage losses.

Abstract

Disclosed is an online real-time loop closing method based on integration of a main network and a distribution network. The online real-time loop closing method is characterized by comprising the following steps: S01: conducting network modeling; S02: conducting main network and distribution network measuring and reading and acquiring initial section data of loop closing load flow calculation; S03: conducting loop searching and phase verification; S04: conducting loop closing load flow calculation; and S05: conducting loop closing risk evaluation. Models and real-time data are online acquired in an EMS and a DMS respectively, calculation results are interacted through an information exchange bus, and then loop closing load flow calculation units or programs running on a PAS server of the DMS and a PAS server of the energy management system can simultaneously acquire the models and the data of the main network and the distribution network for alternate iterative calculation, so that calculation accuracy is greatly improved, and the loop closing load flow calculation units or programs can conveniently run and can be conveniently maintained.

Description

一种基于主配网一体化的在线实时合环方法Online real-time ring-closing method based on main distribution network integration 技术领域Technical field
本发明涉及一种基于主配网一体化的在线实时合环方法。The invention relates to an online real-time ring-closing method based on integration of a main distribution network.
背景技术Background technique
目前的合环操作往往根据运行人员的经验进行判断，但是上级高压供电系统结构和状态的改变，本级运行不容易完全掌握，这就使得目前的合环操作缺少有力的理论和分析，很容易出现判断偏差，造成跳闸。这无疑将增加停电次数，降低系统供电可靠性和经济性。The current closed-loop operation is often judged according to the experience of the operating personnel. However, the structure and state of the higher-voltage power supply system are changed, and the operation of this level is not easy to fully grasp. This makes the current closed-loop operation lack powerful theory and analysis, which is easy. A judgment deviation occurs, causing a trip. This will undoubtedly increase the number of power outages and reduce the reliability and economy of the system.
在线实时合环系统如果单独在EMS系统(电能管理系统：除了具有数据采集和监视控制(SCADA)基本功能外，还具有能对电网的安全和经济运行进行分析、计算、管理和控制的高级应用软件包PAS，PAS包括网络拓扑分析、状态估计、调度员潮流、负荷预测、自动发电控制和经济调度、安全控制和培训仿真系统等)中建模计算，就无法获得DMS系统(配电管理系统)中的模型和数据，导致计算存在较大的误差。如果单独在DMS系统中建模计算，又得不到EMS系统中的模型和数据，同样导致较大的计算误差。Online real-time loop system if it is in the EMS system alone (power management system: in addition to the basic functions of data acquisition and monitoring control (SCADA), it also has advanced applications that can analyze, calculate, manage and control the safety and economic operation of the grid. The software package PAS, PAS includes network topology analysis, state estimation, dispatcher flow, load forecasting, automatic power generation control and economic dispatch, safety control and training simulation system, etc., and can not obtain DMS system (distribution management system) Models and data in the resulting calculations have large errors. If the model is calculated separately in the DMS system, and the models and data in the EMS system are not obtained, it also leads to large calculation errors.
发明内容Summary of the invention
针对上述问题，本发明提供一种基于主配网一体化的在线实时合环方法，分别在EMS系统和DMS系统中在线获取模型和实时数据，将计算结果通过信息交换总线进行交互，使得运行在DMS系统和能量管理系统(EMS系统)的PAS服务器上的合环潮流计算单元或程序同时获得主网和配网的模型和数据进行交替迭代计算，大大提高了计算的精度，同时方便合环潮流计算单元或程序的运行和维护。 In view of the above problems, the present invention provides an online real-time ring-closing method based on integration of a primary distribution network, which acquires models and real-time data online in an EMS system and a DMS system, respectively, and interacts the calculation results through an information exchange bus, so that the operation is performed. The combined power flow calculation unit or program on the PAS server of the DMS system and the energy management system (EMS system) simultaneously obtains the iterative calculation of the model and data of the main network and the distribution network, which greatly improves the calculation accuracy and facilitates the trend of the loop. The operation and maintenance of a calculation unit or program.
为实现上述技术目的，达到上述技术效果，本发明通过以下技术方案实现：In order to achieve the above technical effects and achieve the above technical effects, the present invention is achieved by the following technical solutions:
一种基于主配网一体化的在线实时合环方法，其特征在于，包括如下步骤：An online real-time ring-closing method based on integration of a primary distribution network, comprising the following steps:
S01：网络建模：配电自动化系统从EMS系统导入主网模型，从PMS系统或者GIS系统导入10kV配网模型，将主网、配网模型拼接，构建一体化的主配网物理模型，自动拓扑搜索将物理模型转换为计算模型；S01: Network modeling: The distribution automation system imports the main network model from the EMS system, imports the 10kV distribution network model from the PMS system or the GIS system, splicing the main network and the distribution network model, and constructing an integrated main distribution network physical model, automatically Topological search converts the physical model into a computational model;
S02：主配网量测读取，获得合环潮流计算的初始断面数据；S02: The main distribution network is measured and read, and the initial cross-section data of the combined power flow calculation is obtained;
S03：环路搜索与相位校验：根据PAS应用实时数据库中的合环参数和电网运行方式，主网自动拓扑搜索获得合环环路的拓扑信息，并对环路内的拓扑连接关系和变压器支路接线方式的相位进行校验，直到拓扑搜索到最短合环路径；S03: Loop search and phase check: According to the closed loop parameters and the grid operation mode in the real-time database of the PAS application, the automatic topology search of the main network obtains the topology information of the closed loop, and the topology connection relationship and the transformer in the loop. The phase of the branch wiring mode is verified until the topology searches for the shortest loop path;
S04：合环潮流计算：主网EMS系统计算合环端口的阻抗并传送至配网合环潮流计算单元，配网拓扑自动搜索后进行合环前初始潮流计算至迭代收敛，得到联络开关两侧的电压矢量差，计算出联络开关的合环稳态电流和合环冲击电流值，同时，计算合环冲击潮流在其它支路设备上的分布，即计算出其它支路开关在合环瞬间的电流值；S04: Compatible power flow calculation: The main network EMS system calculates the impedance of the joint port and transmits it to the distribution network and the power flow calculation unit. After the automatic topology search, the initial power flow calculation before the loop is performed to the iterative convergence, and the two sides of the contact switch are obtained. The voltage vector difference is calculated, and the steady-state current and the combined inrush current value of the tie switch are calculated. At the same time, the distribution of the combined impact current on the other branch devices is calculated, that is, the current of other branch switches at the moment of the ring is calculated. value;
具体为：稳态潮流计算单元将合环冲击电流的影响等效为合环支路两端的逻辑母线的有功和无功的注入量的变化，即将合环支路断开，在合环支路的首末端对注入量分别增加和减少合环冲击电流的数值，计算出合环冲击电流对整个系统的其它支路设备的影响，直到收敛为止；Specifically, the steady-state load calculation unit equalizes the influence of the combined impact current to the change of the active and reactive injection quantities of the logic bus bars at both ends of the closed-loop branch, that is, the closed-loop branch is disconnected, in the closed-loop branch The first end of the pair increases and decreases the value of the combined impact current, and calculates the influence of the combined impact current on the other branch devices of the whole system until convergence;
S05：合环风险评估：合环潮流计算结束后，判定系统是否有合环时冲击电流超过开关保护动作情况，如果有，则系统给出此次合环不合理的警告，否则可以进行合环操作。S05: Risk assessment of the closed loop: After the completion of the calculation of the combined power flow, it is determined whether the inrush current exceeds the protection of the switch when the system has a closed loop. If there is, the system gives an unreasonable warning of the closed loop, otherwise the loop can be performed. operating.
在进行合环操作时，可能产生较大的环流，这将直接影响到电网的安全稳 定运行。在强大的EMS系统和DMS系统基础之上，在配电自动化系统读取配网的模型和量测数据进行合环前和合环后潮流计算分析，合环潮流计算所需的主网侧端口等值阻抗和10kV站内母线电压相角由EMS系统计算，配电自动化系统合环潮流计算单元或程序向EMS系统接口发出计算请求，EMS系统收到计算请求则调用潮流计算程序并将计算结果发送给配电自动化系统合环潮流计算单元或程序，实现基于主配网模型一体化计算，大大提高了计算的精度，同时方便合环潮流计算单元或程序的运行和维护。When performing the loop operation, a large circulation may occur, which will directly affect the safety and stability of the grid. Scheduled to run. Based on the powerful EMS system and DMS system, the distribution automation system reads the model and measurement data of the distribution network for pre- and post-loop power flow calculation analysis, and the main network side port required for the mixed-loop load calculation. The value impedance and the voltage phase angle of the bus voltage in the 10kV station are calculated by the EMS system. The power distribution automation system combined power flow calculation unit or program sends a calculation request to the EMS system interface. When the EMS system receives the calculation request, it calls the power flow calculation program and sends the calculation result to the The power distribution automation system combined with the power flow calculation unit or program realizes integrated calculation based on the main distribution network model, which greatly improves the calculation accuracy and facilitates the operation and maintenance of the combined power flow calculation unit or program.
优选当整个系统没有合环时冲击电流超过开关保护动作情况时，系统对合环时电流和开关保护动作电流的比值做排序，给出系统合环时将会出现的危险点。有助于运行人员对地区电力网络进行恰当的调整，将为调度运行方式提供理论参考，并可辅助进行决策，从而保证用户利益，减少停电损失。Preferably, when the inrush current exceeds the protection action of the switch when the whole system is not closed, the system sorts the ratio of the current and the protection current of the switch protection when the ring is closed, and gives a dangerous point that will occur when the system is closed. It helps the operators to make appropriate adjustments to the regional power network, which will provide a theoretical reference for the dispatch operation mode and assist decision-making to ensure the user's interests and reduce power outage losses.
本发明的有益效果是：分别在EMS系统和DMS系统中在线获取模型和实时数据，将计算结果通过信息交换总线进行交互，使得运行在DMS系统和能量管理系统的PAS服务器上的合环潮流计算单元或程序同时获得主网和配网的模型和数据进行交替迭代计算，大大提高了计算的精度，方便合环潮流计算单元或程序的运行和维护。The invention has the beneficial effects that the model and the real-time data are acquired online in the EMS system and the DMS system respectively, and the calculation results are exchanged through the information exchange bus, so that the combined power flow calculation on the PAS server of the DMS system and the energy management system is performed. The unit or program obtains the model and data of the main network and the distribution network for alternate iterative calculation, which greatly improves the calculation accuracy and facilitates the operation and maintenance of the combined power flow calculation unit or program.
附图说明DRAWINGS
图1是本发明一种基于主配网一体化的在线实时合环方法的流程图；1 is a flow chart of an online real-time ring-closing method based on integration of a primary distribution network according to the present invention;
具体实施方式detailed description
下面结合附图和具体的实施例对本发明技术方案作进一步的详细描述，以使本领域的技术人员可以更好的理解本发明并能予以实施，但所举实施例不作为对本发明的限定。The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can understand the invention.
如图1所示，一种基于主配网一体化的在线实时合环方法，包括如下步骤： As shown in FIG. 1 , an online real-time ring-closing method based on integration of a primary distribution network includes the following steps:
S01：网络建模：配电自动化系统从EMS系统导入主网模型，从PMS系统(生产管理系统)或者GIS系统导入10kV配网模型，将主网、配网模型拼接，构建一体化的主配网物理模型，自动拓扑搜索将物理模型转换为计算模型。S01: Network Modeling: The distribution automation system imports the main network model from the EMS system, and imports the 10kV distribution network model from the PMS system (production management system) or GIS system, splicing the main network and the distribution network model to construct an integrated main distribution. The network physical model, automatic topology search converts the physical model into a computational model.
模型分为物理模型和计算模型，物理模型分为面向用户的关系模型和面向分析的层次模型，计算模型是形成电路结构特点的模型。网络建模实现了关系模型向层次模型的映射。在物理建模过程中，实现多区域主网模型数据与配网模型数据的拼接。其中物理建模可以准确、完整、高效的描述配电网模型中的所有电气元件及其连接关系和参数。The model is divided into a physical model and a computational model. The physical model is divided into a user-oriented relational model and an analytical-oriented hierarchical model. The computational model is a model that forms the characteristics of the circuit structure. Network modeling implements the mapping of relational models to hierarchical models. In the physical modeling process, the splicing of the multi-region main network model data and the distribution network model data is realized. Physical modeling can accurately, completely and efficiently describe all electrical components in the distribution network model and their connection relationships and parameters.
网络建模包括模型的导入和模型的拼接，其中：Network modeling includes the import of models and the splicing of models, where:
模型的导入：模型的建立是建立源设备与内部设备的映射关系，建立内部设备间的层次形映射关系。基于IEC 61970 CIM标准模型按照电力系统资源的层次结构组成设备模型形成若干个类。一个设备类型定义一个类，一个设备即为一个独立的类对象，每个设备形成一个二维关系表，关系表存放在关系数据库中。Model import: The model is established to establish the mapping relationship between the source device and the internal device, and establish a hierarchical mapping relationship between the internal devices. Based on the IEC 61970 CIM standard model, a device model is formed according to the hierarchical structure of power system resources to form several classes. A device type defines a class, a device is a separate class object, each device forms a two-dimensional relation table, and the relation table is stored in a relational database.
模型的拼接：模型在从PMS系统或者GIS系统导入到配电自动化系统时，就将主、配网模型拼接起来，形成完整的拓扑连接关系。所有设备表和参数表，计算结果表都存放在商用数据库中，商用数据库的具体介绍可参见http://wenku.baidu.com/link？url＝GZt4t543m2cxe15FLPYpFOhfV-7B5X3DuvI3 57_tSUY0VWElDt_xjJRe5KhIKSkHmz5U-5cTEaHOL7OI_xt1b1GcuJYmMopi4z17Kkn7 6Vi，在此不再赘述。服务端使用某些表时，将存放在数据服务器上的商用库中的设备信息下装到各个应用服务器上，并建立实时数据库。Model splicing: When the model is imported from the PMS system or GIS system to the distribution automation system, the main and distribution network models are spliced together to form a complete topology connection relationship. All equipment tables and parameter tables, calculation result tables are stored in commercial databases. For a detailed introduction of commercial databases, please refer to http://wenku.baidu.com/link? Url=GZt4t543m2cxe15FLPYpFOhfV-7B5X3DuvI3 57_tSUY0VWElDt_xjJRe5KhIKSkHmz5U-5cTEaHOL7OI_xt1b1GcuJYmMopi4z17Kkn7 6Vi , and will not be described here. When the server uses some tables, the device information stored in the commercial library on the data server is downloaded to each application server, and a real-time database is established.
拓扑分析类是配网分析应用软件的公共模块，既可作为一个独立的应用， 也可为其他应用提供初步分析结果做进一步分析。其主要功能在于通过分析配电网各个电气元件的连接关系和运行方式确定实时网络结构。网络拓扑实现物理模型向计算模型的转换：将零阻抗支路如母线、开关、刀闸、负荷等设备在同电压节点合并为一个节点，将非零阻抗支路如变压器、线路等设备处理为支路，最终形成只有节点和支路的抽象数学计算模型。当系统检测到开关状态发生变化时就会自动触发模型转换功能。EMS系统中网络拓扑部分的开发是利用SS40的层次库模型，DMS系统中网络拓扑部分的开发是形成动态库调用。网络拓扑形成原始模型信息，建立源设备与内部设备映射，静态设备连接关系，动态设备连接关系。The topology analysis class is a common module of the distribution network analysis application software, and can be used as a stand-alone application. Preliminary analysis results can also be provided for other applications for further analysis. Its main function is to determine the real-time network structure by analyzing the connection relationship and operation mode of each electrical component of the distribution network. The network topology realizes the conversion of the physical model to the calculation model: the zero-impedance branch such as bus, switch, knife gate, load and other equipment are combined into one node at the same voltage node, and the non-zero impedance branch such as transformer, line and other devices are processed as The branch road eventually forms an abstract mathematical calculation model with only nodes and branches. The model conversion function is automatically triggered when the system detects a change in the switch state. The development of the network topology part of the EMS system is to use the hierarchical library model of SS40. The development of the network topology part of the DMS system is to form a dynamic library call. The network topology forms the original model information, and establishes source device and internal device mapping, static device connection relationship, and dynamic device connection relationship.
配电自动化系统模型范围覆盖主网以及配网，包括10kV配网图模数据及EMS系统上级电网图模数据。10kV配网图模数据从PMS系统或者GIS系统获取，主网模型从EMS获取，在配电自动化系统完成主、配网模型的拼接以及模型动态变化管理功能，构建完整的配网分析应用模型。The model of the distribution automation system covers the main network and the distribution network, including the 10kV distribution network pattern data and the EMS system upper-level grid pattern data. The 10kV distribution network model data is obtained from the PMS system or the GIS system. The main network model is obtained from the EMS. The main assembly and distribution network model splicing and the model dynamic change management function are completed in the distribution automation system, and a complete distribution network analysis application model is constructed.
S02：主配网量测读取：EMS系统和DMS系统状态估计、潮流计算等高级应用，为合环潮流计算系统提供了良好的基础条件。合环潮流计算系统的初始断面数据(断面数据是电力网络在某一个时刻点所有的设备量测数据和开关状态数据)可以来源于实时状态估计模块，也可以来源于潮流计算模块，还可以来源于历史数据断面。S02: Main distribution network measurement and reading: Advanced applications such as EMS system and DMS system state estimation and power flow calculation provide good basic conditions for the combined power flow calculation system. The initial section data of the combined power flow calculation system (section data is all the equipment measurement data and switch status data of the power network at a certain point in time) may be derived from the real-time state estimation module, or may be derived from the power flow calculation module, or may be sourced. In the historical data section.
历史数据断面可以从CASE管理系统中获取，也可以通过信息交换总线从生产管理系统(PMS系统)获取中压配电网(包括10kV、20kV)的相关设备参数、配网负荷历史数据和历史曲线。同时从生产管理系统(PMS)或电网GIS平台获取中压配电网(包括10kV、20kV)的馈线电气单线图、网络拓扑等。也可以通 过信息交换总线从上一级调度(一般指地区调度)自动化系统获取高压配电网(包括35kV、110kV)的网络拓扑、相关设备参数、实时数据和历史数据，利用E语言取得主配网数据存放到配网实时数据库中。由合环程序(前面所有功能模块即所有跟合环操作、计算等相关的程序集合统称为合环程序，包括拓扑分析和合环潮流计算)根据需要从实时数据库中读取模型数据建立配网模型，读取设备连接关系形成拓扑搜索，读取实时数据参与潮流计算。由于合环潮流需要合环开关两侧系统侧端口阻抗，如果将主网模型数据和图形数据导入到配网计算，工作量大，数据维护不方便，因此采用在主网EMS中布置程序(即主网端口等值阻抗计算接口程序)，在主网中计算然后将计算结果传送给配网合环潮流程序进行合环潮流计算。既保证计算的准确性，又利于程序维护，使用方便。The historical data section can be obtained from the CASE management system, or the relevant equipment parameters, distribution network load history data and historical curve of the medium voltage distribution network (including 10kV, 20kV) can be obtained from the production management system (PMS system) through the information exchange bus. . At the same time, the feeder single-line diagram and network topology of the medium-voltage distribution network (including 10kV, 20kV) are obtained from the production management system (PMS) or the grid GIS platform. Can also pass The information exchange bus obtains the network topology, related equipment parameters, real-time data and historical data of the high-voltage distribution network (including 35kV, 110kV) from the upper-level scheduling (generally referred to as regional dispatching) automation system, and obtains the main distribution network data by using E language. Stored in the distribution network real-time database. By the loop program (all the previous functional modules, that is, all the related program loops, calculations, etc., collectively referred to as the loop program, including topology analysis and closed-loop load flow calculation), read the model data from the real-time database as needed to establish a distribution network model. The device connection relationship is read to form a topology search, and the real-time data is read to participate in the power flow calculation. Since the combined current trend requires the system side port impedance on both sides of the closed switch, if the main network model data and graphic data are imported into the distribution network calculation, the workload is large and the data maintenance is inconvenient, so the program is arranged in the main network EMS (ie, The main network port equivalent impedance calculation interface program) is calculated in the main network and then the calculation result is transmitted to the distribution network and the power flow program for the combined power flow calculation. It not only ensures the accuracy of calculation, but also facilitates program maintenance and is convenient to use.
S03：环路搜索与相位校验：S03: Loop search and phase check:
为了提高系统整体的安全性，需要根据PAS应用实时数据库中的合环参数和电网运行方式，主网自动拓扑搜索获得合环环路的拓扑信息，并对环路内的拓扑连接关系和变压器支路接线方式的相位进行校验，直到拓扑搜索到最短合环路径。In order to improve the overall security of the system, it is necessary to obtain the topology information of the closed loop and the topology connection and the transformer branch in the loop according to the loop parameters and the grid operation mode in the real-time database of the PAS application. The phase of the way of the wiring is verified until the topology searches for the shortest path.
优选先进行拓扑连接关系校验：Preferably, the topology connection relationship check is performed first:
a)连接关系检查包括：无节点号、节点号错误、节点空挂。a) The connection relationship check includes: no node number, node number error, node empty.
b)参数检查包括缺少参数、参数错误、参数偏离正常值等。b) Parameter checking includes missing parameters, parameter errors, and deviations from normal values.
c)检验结果分为严重(错误)和非严重(告警)，存在错误时不能复制给状态估计。无论是否严重，都要找一下原因。c) The test results are classified into severe (error) and non-critical (alarm), and cannot be copied to the state estimate when there is an error. Whether it is serious or not, find out why.
可以按照厂站、校验类型、是否严重进行排序，校验无误后进行下一步的 校验，否则返回步骤S01。According to the station, the type of verification, whether it is sorted seriously, and the next step is verified after the verification is correct. Check, otherwise return to step S01.
合环拓扑搜索：Combined ring topology search:
按照联络开关进行全网拓扑搜索，在搜索过程中从实时数据库中读取线路参数和配网变压器及其配网负荷的功率值。如果搜索到环网，则环网存在，如果搜索不到则提示环网不存在。According to the contact switch, the whole network topology search is performed, and the line parameters and the power values of the distribution network transformer and its distribution network load are read from the real-time database during the search process. If the ring network is searched, the ring network exists. If the search fails, the ring network does not exist.
变压器绕组接线方式相位校验：Transformer winding wiring phase verification:
相序、相位一致是同一个电源的两路出线或环网之间的合环的必要条件。不经相序、相位检验进行合环操作，会给系统带来严重的冲击。所以，所有10 kV开关的开环点，都必须经过“相序、相位”的检查，即保证开环点两侧电源的各相正确对应，并且参与合环变压器的连接组别保持一致。对于环内变压器绕组的接线方式，合环潮流计算模块会进行校验，如果存在环内的相位差，则系统会给出不合理提示。Phase sequence and phase consistency are necessary conditions for the two outgoing lines of the same power supply or the loop between the ring networks. Without the phase sequence and phase inspection, the loop operation will bring serious impact to the system. Therefore, the open-loop points of all 10 kV switches must pass the "phase sequence, phase" check, that is, ensure that the phases of the power supply on both sides of the open-loop point are correctly matched, and the connection groups participating in the closed-loop transformer are consistent. For the wiring mode of the transformer winding in the ring, the combined power flow calculation module will check. If there is a phase difference in the ring, the system will give an unreasonable prompt.
S04：合环潮流计算：主网EMS系统计算合环端口的阻抗并传送至配网合环潮流计算单元，配网拓扑自动搜索后进行合环前初始潮流计算至迭代收敛，得到联络开关两侧的电压矢量差，计算出联络开关的合环稳态电流和合环冲击电流值，同时，计算合环冲击潮流在其它支路设备上的分布，即计算出其它支路(其它支路即与合环路径有电气连接的支路)开关在合环瞬间的电流值，具体的计算步骤可参见现有技术。S04: Compatible power flow calculation: The main network EMS system calculates the impedance of the joint port and transmits it to the distribution network and the power flow calculation unit. After the automatic topology search, the initial power flow calculation before the loop is performed to the iterative convergence, and the two sides of the contact switch are obtained. The voltage vector difference is calculated, and the closed-loop steady-state current and the combined-current impulse current value of the tie switch are calculated. At the same time, the distribution of the combined impact tidal current on other branch devices is calculated, that is, other branches are calculated (other branches are combined The branch path has an electrical connection branch. The current value of the switch at the moment of the ring connection. For the specific calculation steps, refer to the prior art.
稳态潮流计算单元将合环冲击电流的影响等效为合环支路两端的逻辑母线的有功和无功的注入量的变化，即将合环支路断开，在合环支路的首末端对注入量分别增加和减少合环冲击电流的数值，计算出合环冲击电流对整个系统的其它支路设备的影响，直到迭代收敛为止。 The steady-state load flow calculation unit equalizes the influence of the combined ring surge current to the change of the active and reactive injection quantities of the logic bus bars at both ends of the closed-loop branch, that is, the closed-loop branch is disconnected, at the head end of the closed-loop branch The injection quantity is increased and decreased respectively, and the value of the combined impact current is calculated, and the influence of the combined impact current on the other branch devices of the whole system is calculated until the iteration converges.
合环操作将引起原供电电源区域的潮流变化，为了保证电网运行的安全性，有必要进行合环潮流计算，以检验相关支路的潮流其有功、无功、电流的数值以及母线电压是否越限。合环潮流计算单元或程序给出开关合闸时的最大合环冲击电流、合环稳态电流并分析安全校验的结果。The loop operation will cause the power flow in the original power supply area to change. In order to ensure the safety of the power grid operation, it is necessary to carry out the combined power flow calculation to verify the power of the relevant branch, the value of active, reactive, current and the bus voltage. limit. The combined power flow calculation unit or program gives the maximum combined ring surge current and the closed-loop steady-state current when the switch is closed, and analyzes the results of the safety check.
S05：合环风险评估：合环潮流计算结束后，判定系统是否有合环时冲击电流超过开关保护动作情况，如果有，则系统给出此次合环不合理的警告，否则可以进行合环操作。当整个系统没有合环时冲击电流超过开关保护动作情况时，系统对合环时电流和开关保护动作电流的比值做排序，给出系统合环时将会出现的危险点。有助于运行人员对地区电力网络进行恰当的调整，将为调度运行方式提供理论参考，并可辅助进行决策，从而保证用户利益，减少停电损失。S05: Risk assessment of the closed loop: After the completion of the calculation of the combined power flow, it is determined whether the inrush current exceeds the protection of the switch when the system has a closed loop. If there is, the system gives an unreasonable warning of the closed loop, otherwise the loop can be performed. operating. When the inrush current exceeds the switch protection action when the whole system is not closed, the system sorts the ratio of the current and the switch protection action current when the ring is closed, and gives the dangerous point that will occur when the system is closed. It helps the operators to make appropriate adjustments to the regional power network, which will provide a theoretical reference for the dispatch operation mode and assist decision-making to ensure the user's interests and reduce power outage losses.
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或者等效流程变换，或者直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。 The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (4)

  1. 一种基于主配网一体化的在线实时合环方法，其特征在于，包括如下步骤：An online real-time ring-closing method based on integration of a primary distribution network, comprising the following steps:
    S01：网络建模：配电自动化系统从EMS系统导入主网模型，从PMS系统或者GIS系统导入10kV配网模型，将主网、配网模型拼接，构建一体化的主配网物理模型，自动拓扑搜索将物理模型转换为计算模型；S01: Network modeling: The distribution automation system imports the main network model from the EMS system, imports the 10kV distribution network model from the PMS system or the GIS system, splicing the main network and the distribution network model, and constructing an integrated main distribution network physical model, automatically Topological search converts the physical model into a computational model;
    S02：主配网量测读取，获得合环潮流计算的初始断面数据；S02: The main distribution network is measured and read, and the initial cross-section data of the combined power flow calculation is obtained;
    S03：环路搜索与相位校验：根据PAS应用实时数据库中的合环参数和电网运行方式，主网自动拓扑搜索获得合环环路的拓扑信息，并对环路内的拓扑连接关系和变压器支路接线方式的相位进行校验，直到拓扑搜索到最短合环路径；S03: Loop search and phase check: According to the closed loop parameters and the grid operation mode in the real-time database of the PAS application, the automatic topology search of the main network obtains the topology information of the closed loop, and the topology connection relationship and the transformer in the loop. The phase of the branch wiring mode is verified until the topology searches for the shortest loop path;
    S04：合环潮流计算：主网EMS系统计算合环端口的阻抗并传送至配网合环潮流计算单元，配网拓扑自动搜索后进行合环前初始潮流计算至迭代收敛，得到联络开关两侧的电压矢量差，计算出联络开关的合环稳态电流和合环冲击电流值，同时，计算合环冲击潮流在其它支路设备上的分布，即计算出其它支路开关在合环瞬间的电流值；S04: Compatible power flow calculation: The main network EMS system calculates the impedance of the joint port and transmits it to the distribution network and the power flow calculation unit. After the automatic topology search, the initial power flow calculation before the loop is performed to the iterative convergence, and the two sides of the contact switch are obtained. The voltage vector difference is calculated, and the steady-state current and the combined inrush current value of the tie switch are calculated. At the same time, the distribution of the combined impact current on the other branch devices is calculated, that is, the current of other branch switches at the moment of the ring is calculated. value;
    S05：合环风险评估：合环潮流计算结束后，判定系统是否有合环时冲击电流超过开关保护动作情况，如果有，则系统给出此次合环不合理的警告，否则可以进行合环操作。S05: Risk assessment of the closed loop: After the completion of the calculation of the combined power flow, it is determined whether the inrush current exceeds the protection of the switch when the system has a closed loop. If there is, the system gives an unreasonable warning of the closed loop, otherwise the loop can be performed. operating.
  2. 根据权利要求1所述的一种基于主配网一体化技术的在线实时合环方法，其特征在于，在步骤S05中，当系统没有合环时冲击电流超过开关保护动作情况时，系统对合环时电流和开关保护动作电流的比值做排序，给出系统合环时将会出现的危险点。The online real-time ring-closing method based on the main distribution network integration technology according to claim 1, wherein in step S05, when the inrush current exceeds the switch protection action when the system is not looped, the system is coupled. The ratio of the ring current and the switch protection action current is sorted to give a dangerous point that will occur when the system is closed.
  3. 根据权利要求1所述的一种基于主配网一体化技术的在线实时合环方法，其 特征在于，在步骤S02中，合环潮流计算的初始断面数据来源于实时状态估计单元或潮流计算单元或历史数据断面。The online real-time ring-closing method based on the main distribution network integration technology according to claim 1, It is characterized in that, in step S02, the initial section data of the combined trend calculation is derived from a real-time state estimation unit or a power flow calculation unit or a historical data section.
  4. 根据权利要求3所述的一种基于主配网一体化技术的在线实时合环方法，其特征在于，在步骤S02之后还包括拓扑连接关系校验，当校验无误后进行步骤S03，否则返回步骤S01。 The online real-time ring-closing method based on the main distribution network integration technology according to claim 3, further comprising: performing a topology connection relationship check after step S02, and performing step S03 after the verification is correct, otherwise returning Step S01.
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