CN111756048A - Power distribution network closed loop load transfer method - Google Patents
Power distribution network closed loop load transfer method Download PDFInfo
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- CN111756048A CN111756048A CN202010732365.9A CN202010732365A CN111756048A CN 111756048 A CN111756048 A CN 111756048A CN 202010732365 A CN202010732365 A CN 202010732365A CN 111756048 A CN111756048 A CN 111756048A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- 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]
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a power distribution network closed loop load transfer method, which comprises the following steps: s1, building a power grid model; s2, determining the optimal ring closing point of the system; s3, calculating loop closing current; s4, checking relay protection: analyzing the relay protection influence aiming at the closed loop operation; s5, implementing a loop closing command: issuing a loop closing control sequence, monitoring and controlling loop closing key equipment to perform loop closing control on a loop closing point, acquiring electrical quantity information of the loop closing point, monitoring a loop closing state of the loop closing point, and tracing an event record aiming at the event record of a loop closing and power dispatching operation process; the problem of current close ring switching power supply in-process misarrangement operation mode, misadjustment, error control potential safety hazard is solved.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a power distribution network closed loop load transfer method.
Background
Most of the power distribution networks in China are in a radial single-loop wiring mode. When a line breaks down, a power supply needs to be cut off, short-time power failure of the branch user end can be caused, the stability of system power supply is damaged, and the requirement of a user on the continuity of the power supply cannot be met. The loop closing switches on the interconnection switch to switch two or more distribution lines of the same voltage class from a radial connection to a loop connection. As a novel power supply mode, the loop closing switching power supply does not need to additionally erect a circuit, when a fault occurs and power failure operation needs to be carried out, electric energy can be obtained from another branch circuit through an interconnection switch (a loop closing point is arranged on a branch circuit) or a bus-bar switch (a loop closing point is arranged on a bus), the investment of circuit construction is saved, and meanwhile, the continuity and the reliability of power supply are also guaranteed.
At present, in the process of switching closed loop of a power distribution network to power supply, in-loop power flow control, power plant output control and load control mainly depend on manual calculation, and the method can only roughly judge that the calculation result is inaccurate; the critical condition that the loop closing switching power supply may cause line overload is often not accurately judged, and a judgment basis is lacked for the condition that the operation mode of a power grid is changed and the loop closing mode is complex. Although a closed loop switching power supply automatic computing system is developed in part of regions, the traditional algorithm only considers one or two constraint conditions, so that the computing result cannot meet the engineering application. Although the constraint conditions related to part of algorithms are increased, the algorithm precision is not high, the obtained result is not accurate, the algorithm takes long time, and the convergence is not good.
Disclosure of Invention
The invention aims to provide a power distribution network closed-loop load transfer method, which solves the problems that the existing calculated result of closed-loop transfer power supply has errors and the current power grid operation condition cannot be truly reflected, and the problems of misarrangement of operation modes, misadjustment and miscontrol potential safety hazards in the closed-loop transfer power supply process are caused.
The invention provides the following technical scheme:
a power distribution network closed loop load transfer method comprises the following steps:
s1, building a power grid model: aiming at the requirement of closed loop check of the current operating power grid, acquiring the current power grid including real-time operating data of a superior power grid to establish a power grid model; s2, determining the optimal ring closing point of the system: on the basis of the known running state of the current distribution network automation system, determining the optimal loop closing point of the distribution network automation system according to a set objective function by using an algorithm, and giving an operation sequence of a loop closing power-adjusting switch; s3, loop closing current calculation: by utilizing the power grid model data, combining with topological analysis, calculating closed-loop steady-state load flow and impact current through load flow calculation and path tracking functions, and providing a data basis for closed-loop verification; checking the influence of the closed-loop operation on the electrical equipment; s4, checking relay protection: analyzing the relay protection influence aiming at the closed loop operation; s5, implementing a loop closing command: issuing a loop closing control sequence, monitoring and controlling loop closing key equipment to perform loop closing control on a loop closing point, acquiring electrical quantity information of the loop closing point, monitoring a loop closing state of the loop closing point, and tracing an event record in the loop closing and switching operation process.
Preferably, the acquiring of the current power grid includes acquiring real-time operation data of a superior power grid, where the acquiring includes: calling an Svg file and a Qs file in the distribution network automation system, and obtaining a distribution network equipment parameter by using a parameter identification method and a state estimation method: calling real-time power flow data in a distribution network automation system, wherein the real-time power flow data comprises voltage, current and active power: and constructing a power distribution network optimization model according to the power distribution network equipment parameters and the real-time power flow data.
Preferably, the checking of the impact of the closed loop operation on the electrical equipment comprises checking whether the electrical equipment in the loop is overloaded; checking whether the electrical node is over-voltage; and checking whether the ring outer branch line equipment bears the impact.
Preferably, the constraint conditions of the power flow calculation include: the method comprises the steps of obtaining active power flow control limit values in an electromagnetic looped network and an electric looped network according to power balance constraint conditions, voltage safety constraint conditions, active power adjustment constraint conditions of a generator, active power adjustment constraint conditions of a load, maximum allowable power flow constraint conditions of a circuit, maximum allowable power constraint conditions of equipment and adjustable tap adjustment constraint conditions of a transformer.
Preferably, the analyzing of the impact of the closed-loop operation on the relay protection includes checking whether to trigger the relay protection or not, and whether to affect the four-property protection, and the closed-loop impact current early warning system determines whether the closed-loop impact current can cause the overcurrent protection or the quick-break protection malfunction of the closed-loop switch.
The invention has the beneficial effects that:
the invention discloses a power distribution network closed loop load transfer method which comprises the steps of determining the current network operation state by utilizing a built power grid model and collected real-time operation data, selecting an optimal closed loop point, calculating closed loop steady-state current and transient impact current, and analyzing the influence after closed loop. And after the influences of relay protection and system stable operation are checked, a closed loop control strategy is given. And the loop closing and adjusting power control host receives a loop closing and adjusting control sequence issued by the loop closing and adjusting power auxiliary judging system host, collects information, and coordinates the acquisition control terminal in the region to complete the operation of loop closing and adjusting.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow diagram of the process of the present invention;
fig. 2 is a schematic diagram of a loop closing current regulating control flow.
Detailed Description
As shown in fig. 1, a method for transferring closed loop load of a power distribution network includes the following steps:
s1, building a power grid model: aiming at the requirement of closed loop check of the current operating power grid, acquiring the current power grid including real-time operating data of a superior power grid to establish a power grid model; the method for acquiring the real-time operation data of the current power grid including the superior power grid comprises the following steps: calling an Svg file and a Qs file in the distribution network automation system, and obtaining a distribution network equipment parameter by using a parameter identification method and a state estimation method: calling real-time power flow data in the automatic system of the power distribution network, wherein the real-time power flow data comprises voltage, current and active power: and constructing a power distribution network optimization model according to the power distribution network equipment parameters and the real-time power flow data.
S2, determining the optimal ring closing point of the system: on the basis of the known running state of the current distribution network automation system, determining the optimal loop closing point of the distribution network automation system according to a set objective function by using an algorithm, and giving an operation sequence of a loop closing power-adjusting switch;
s3, loop closing current calculation: by utilizing the power grid model data, combining with topological analysis, calculating closed-loop steady-state load flow and impact current through load flow calculation and path tracking functions, and providing a data basis for closed-loop verification; checking the influence of the closed-loop operation on the electrical equipment; verifying the impact of the closed loop operation on the electrical equipment comprises checking whether the electrical equipment in the loop is overloaded; checking whether the electrical node is over-voltage; and checking whether the ring outer branch line equipment bears the impact.
The constraint conditions of the power flow calculation comprise: the method comprises the steps of obtaining active power flow control limit values in an electromagnetic looped network and an electric looped network according to power balance constraint conditions, voltage safety constraint conditions, active power adjustment constraint conditions of a generator, active power adjustment constraint conditions of a load, maximum allowable power flow constraint conditions of a circuit, maximum allowable power constraint conditions of equipment and adjustable tap adjustment constraint conditions of a transformer.
S4, checking relay protection: analyzing the relay protection influence aiming at the closed loop operation; the analysis of the influence of the loop closing operation on the relay protection comprises the steps of detecting whether the relay protection is triggered or not and whether the four-property protection is influenced or not, and judging whether the loop closing impact current can cause overcurrent protection or quick-break protection misoperation of a loop closing switch or not by the loop closing impact current early warning system.
S5, implementing a loop closing command: issuing a loop closing control sequence, monitoring and controlling loop closing key equipment to perform loop closing control on a loop closing point, acquiring electrical quantity information of the loop closing point, monitoring a loop closing state of the loop closing point, and tracing an event record in the loop closing and switching operation process.
As shown in fig. 2, for the operation of the closed-loop power-switching, in combination with the current operation state of the system, the feasibility and the safety of the closed-loop power-switching are fully considered, and in combination with the economy, the sequence of the closed-loop power-switching operation performed by the auxiliary judgment system for the closed-loop power-switching is as follows:
(1) the loop closing and switching auxiliary judging system starts a loop closing and switching process, acquires real-time data (switching value and analog value) information of the current system operation, establishes a system operation state model, performs optimal loop closing point selection calculation according to the current connection switching state of the system, determines an optimal loop closing and opening point and provides a loop closing scheme. The system also provides a method for manually determining a ring closing and opening scheme by an operator;
(2) and calculating steady-state current and impact current according to the loop closing points involved in the loop closing scheme, and performing feasibility verification according to the safe operation criterion of the loop closing and power switching by using the calculation result. If the scheme is not satisfied, specific reason information is given. Returning to the step (1), and continuing to perform the loop closing scheme selection step; if the loop closing and power adjusting control strategy is met, generating a loop closing and power adjusting control strategy, sending the control strategy to a loop closing and power adjusting control host by the loop closing and power adjusting auxiliary judging system host, and entering the next step;
(3) the loop closing and power transferring control host machine determines whether the loop closing operation is not finished or not according to the loop closing control strategy, if not, the loop closing and power transferring process is finished; if yes, issuing loop closing commands to the information acquisition control terminal one by one, and monitoring the control process of the information acquisition control terminal;
(4) the information acquisition control terminal receives the command to check the electric quantity information of the closed-loop point, and on the premise of meeting the closed-loop criterion, the information acquisition control terminal implements the closed-loop operation, checks the closed-loop result, returns the result to the closed-loop power-adjusting control host and the closed-loop power-adjusting system, and continues the ring opening operation (5); if the requirement is not met, returning a result (alarm) to a main machine of the loop closing power dispatching system, prompting an operator to process, stopping the loop closing process, and performing loop closing failure processing according to the loop closing failure processing process;
(5) the loop closing and power dispatching control host issues a loop closing and opening command to the information acquisition control terminal according to the strategy;
(6) the information acquisition control terminal receives the command, confirms the ring opening condition and carries out ring opening and closing operation; and confirming the operation result;
(7) if the loop is successfully released, returning a result to the loop closing control host, and turning to the step (3); if the ring opening fails, the process is stopped, an alarm message is sent to remind an operator to carry out ring closing failure treatment according to the ring closing failure treatment process.
The whole loop closing and opening process is monitored by the loop closing and adjusting system host in the whole process, and the operation personnel is reminded to carry out corresponding operation by utilizing events and alarms. Events and alarms are stored in a history library, so that the events and the alarms are convenient to trace back afterwards. The operator can intervene in the loop closing and opening process, sends an instruction to the loop closing control host and stops the process.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A power distribution network closed loop load transfer method is characterized by comprising the following steps:
s1, building a power grid model: aiming at the requirement of closed loop check of the current operating power grid, acquiring the current power grid including real-time operating data of a superior power grid to establish a power grid model;
s2, determining the optimal ring closing point of the system: on the basis of the known running state of the current distribution network automation system, determining the optimal loop closing point of the distribution network automation system according to a set objective function by using an algorithm, and giving an operation sequence of a loop closing power-adjusting switch;
s3, loop closing current calculation: by utilizing the power grid model data, combining with topological analysis, calculating closed-loop steady-state load flow and impact current through load flow calculation and path tracking functions, and providing a data basis for closed-loop verification; checking the influence of the closed-loop operation on the electrical equipment;
s4, checking relay protection: analyzing the relay protection influence aiming at the closed loop operation;
s5, implementing a loop closing command: issuing a loop closing control sequence, monitoring and controlling loop closing key equipment to perform loop closing control on a loop closing point, acquiring electrical quantity information of the loop closing point, monitoring a loop closing state of the loop closing point, and tracing an event record in the loop closing and switching operation process.
2. The method as claimed in claim 1, wherein the obtaining of the real-time operation data of the current power grid including the upper power grid comprises: calling an Svg file and a Qs file in the distribution network automation system, and obtaining a distribution network equipment parameter by using a parameter identification method and a state estimation method: calling real-time power flow data in a distribution network automation system, wherein the real-time power flow data comprises voltage, current and active power: and constructing a power distribution network optimization model according to the power distribution network equipment parameters and the real-time power flow data.
3. The method for transferring the closed-loop load of the power distribution network according to claim 1, wherein the checking the influence of the closed-loop operation on the electrical equipment comprises checking whether the electrical equipment in the loop is overloaded; checking whether the electrical node is over-voltage; and checking whether the ring outer branch line equipment bears the impact.
4. The method for transferring closed loop load of the power distribution network according to claim 1, wherein the constraint conditions of the power flow calculation include: the method comprises the steps of obtaining active power flow control limit values in an electromagnetic looped network and an electric looped network according to power balance constraint conditions, voltage safety constraint conditions, active power adjustment constraint conditions of a generator, active power adjustment constraint conditions of a load, maximum allowable power flow constraint conditions of a circuit, maximum allowable power constraint conditions of equipment and adjustable tap adjustment constraint conditions of a transformer.
5. The method for forwarding the closed-loop load of the power distribution network according to claim 1, wherein the analyzing the influence of the closed-loop operation on the relay protection comprises checking whether the relay protection is triggered or not, whether the four-characteristic protection is influenced or not, and judging whether the closed-loop impact current can cause the overcurrent protection or the quick-break protection malfunction of the closed-loop switch or not by the closed-loop impact current early warning system.
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Cited By (1)
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| CN117498351A (en) * | 2023-12-22 | 2024-02-02 | 成都天合一成科技服务有限公司 | Full-model simulation system based on real-time data of power grid and used for loop closing control |
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