CN106992598B - Implementation method for simplifying spare power automatic switching start-up discrimination logic - Google Patents

Implementation method for simplifying spare power automatic switching start-up discrimination logic Download PDF

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CN106992598B
CN106992598B CN201710368169.6A CN201710368169A CN106992598B CN 106992598 B CN106992598 B CN 106992598B CN 201710368169 A CN201710368169 A CN 201710368169A CN 106992598 B CN106992598 B CN 106992598B
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supply line
automatic switching
power automatic
logic
main supply
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CN106992598A (en
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陈锦昌
陈兴华
吴国炳
李力
杨文佳
李新超
郑丹
陈睿
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • 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

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

The invention provides a method for realizing simplified spare power automatic switching start judgment logic, which comprises the following steps: before starting, judging whether each main supply circuit trips in real time; when the operation bus is in voltage loss, judging whether the real-time current of each main power supply line is smaller than a no-current fixed value; if yes, continuously checking whether each main supply line meets the trip judgment; if yes, starting the spare power automatic switching action logic after the set starting delay. The method breaks through the tradition that the starting logic of the spare power automatic switching device carries out logic operation on all conditions according to the same level, and simplifies the starting logic of the spare power automatic switching device of the circuit by means of hierarchical judgment and integration. The method can simplify the design of the backup power automatic switching starting logic of a more complex circuit, improve the working efficiency of the backup power automatic switching program design and the logic test inspection, and simultaneously improve the correct action rate of the backup power automatic switching device.

Description

Implementation method for simplifying spare power automatic switching start-up discrimination logic
Technical Field
The invention relates to the technical field of power systems and automation thereof, in particular to a method for realizing simplified standby power automatic switching starting judgment logic.
Background
The automatic switching device of the standby power supply is a device which can quickly and automatically switch the standby power supply into operation or switch a user to the standby power supply after a working power supply is tripped due to a fault, so that the user does not have long-time power failure, and is called the automatic switching device for the standby power supply for short. In order to limit the short-circuit current of the system, avoid the occurrence of a complex electromagnetic ring network, simplify the setting coordination of relay protection and the like, a partition and fragmentation open-loop operation mode is often adopted in the power grid. In order to improve the power supply reliability of the open-loop point substation, an incoming line spare power automatic switching device or a bus tie spare power automatic switching device is generally configured in the open-loop point substation.
The starting logic of the spare power automatic switching device generally takes the voltage loss of a running bus as a main criterion and the no current of a main power supply line as an anti-misoperation criterion, so that the device misoperation caused by the disconnection of a bus voltage transformer (PT) is prevented. However, due to the difference of the load conditions of the stations and the peak-valley characteristic of the load, the spare power automatic switching device of the substation easily meets the auxiliary criterion that no current flows in the main power supply line in the load valley period, and the risk of misoperation of the spare power automatic switching device exists when the bus PT is in voltage loss. In order to make up for the defect, the voltage loss of the line PT of the main power supply line can be increased to be used as a starting logic criterion of the spare power automatic switching device, but in order to avoid the failure of the spare power automatic switching device when a local side switch of the main power supply line trips, the auxiliary criterion of using the line PT of the main power supply line and the switch position of the main power supply line are required to be logically or-operated together. That is, the starting logic of the backup automatic switching device should be: the operation bus is in voltage loss, no current flows in the main supply line, the line PT of the main supply line is in voltage loss or the main supply line switch is in a brake-separating position.
After the PT voltage of the line of the comprehensive main power supply line and the switch position of the main power supply line are added to be used as an auxiliary criterion of the starting logic of the spare power automatic switching device, if the main power supply line only has one circuit, the complexity of the starting logic is limited, and the criterion of the starting logic is as follows: the voltage of the running bus is lost, the main power supply line has no current, the main power supply line PT has no voltage/the running bus has no voltage, the main power supply line has no current, and the main power supply line switch is in the brake separating position. If the main supply line has two loops, the complex program of the starting logic is greatly increased, and the criteria of the starting logic are as follows: the method comprises the steps of no voltage loss of a running bus, no current of a main supply line, no current of a line PT of a line 1 of the main supply line, no voltage loss of a line PT of a line 2 of the main supply line/no voltage loss of the running bus, no current of the main supply line, no current of a switch 1 of the main supply line, no current of the switch 2 of the main supply line at a brake separating position/no voltage of the running bus, no current of the main supply line, no current of the switch 1 of the main supply line at a brake separating position, and no voltage loss of the line PT of the main supply line 2. If the main supply line has three or four loops, the start-up logic is very complicated.
Disclosure of Invention
The invention provides a method for simplifying the spare power automatic switching start-up discrimination logic, which aims to overcome the technical problem that the implementation method of the spare power automatic switching start-up discrimination logic in the prior art is complex, and effectively simplifies the spare power automatic switching start-up discrimination logic.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for realizing simplified spare power automatic switching start-up discrimination logic is characterized by comprising the following steps:
s101: after the spare power automatic switching device is charged, judging whether each main supply line trips or not in real time before starting;
s102: when the operation bus is in voltage loss, judging whether the real-time current values of all the main power supply lines are smaller than a no-current fixed value;
s103: if the judgment of S102 is yes, checking whether each main supply line meets the trip judgment;
s104: if the judgment of S103 is yes, the backup power automatic switching operation logic is started after the set starting delay.
Preferably, before starting, the main supply lines are judged in real time whether to trip, and the judgment logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, and the switch of the main supply line is changed from a closing state to an opening state.
Preferably, before starting, the main supply lines are judged in real time whether to trip, and the judgment logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, and the line PT voltage of the main supply line is changed from voltage to no-voltage.
Preferably, before starting, the main supply lines are judged in real time whether to trip, and the judgment logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, the switch of the main supply line is changed from a closing state to an opening state, and the line PT voltage of the main supply line is changed from voltage to no-voltage.
Further, after the step of determining whether the real-time current values of the main power supply lines are all smaller than the no-flow fixed value, the method further includes the step S1021: if the real-time current value of the main power supply line is judged to be not smaller than the no-current fixed value when the operating bus is in voltage loss, the spare power automatic switching operation logic is not started, and the spare power automatic switching is discharged.
Further, after the checking whether each main supply line has satisfied the trip judgment, the method further includes step S1031: and if the main supply circuit does not meet the trip judgment, the spare power automatic switching action logic is not started, and the spare power automatic switching is discharged.
Compared with the prior art, the beneficial effects are: the design of the more complicated circuit backup power automatic switching starting logic is simplified, the working efficiency of backup power automatic switching program design and logic test inspection is improved, and the effect of the correct action rate of the backup power automatic switching device is improved.
Drawings
Fig. 1 is a flowchart of a method for implementing a simplified spare power automatic switching start-up decision logic according to the present invention.
Detailed Description
The technical solution of the present invention is further described with reference to fig. 1 and the specific embodiment.
Example 1
As shown in fig. 1, a method for implementing a simplified spare power automatic switching start-up decision logic includes the following steps:
step S101, after the spare power automatic switching device is charged, judging whether each main supply line trips in real time before starting, and then the step S102 is carried out.
The method for judging whether each main supply circuit trips or not comprises the following steps: the current value of the main supply line is smaller than the no-current fixed value, and the switch of the main supply line is changed from a closing state to an opening state; or the current value of the main supply line is smaller than the no-current fixed value, and the line PT voltage of the main supply line is changed from voltage to no-voltage. If one or both of the two conditions are met, the main supply line is judged to be tripped.
And S102, judging whether the real-time current values of the main power supply lines are all smaller than the no-current fixed value when the operating bus is in voltage loss, and if so, entering S103.
When the bus is under a voltage loss in the step S102, after determining whether the real-time current values of the main power supply lines are all smaller than the no-current constant value, and before the step S103, the method may further include the step S1021: and if the real-time current values of the main supply lines do not meet the condition that the real-time current values are all smaller than the no-current fixed value, the spare power automatic switching device is not started.
Step S103 checks whether each main supply line has satisfied the trip determination, and if so, the process goes to step S104.
Similarly, after the step S103 checks whether each main supply line has satisfied the trip determination and before the step S104, the method may further include the step S1031: and if the judging condition that each main supply line has tripped is not met, the spare power automatic switching device is not started.
And step S104, if the tripping condition of each main supply line is met, starting the spare power automatic switching action logic after the set starting delay.
According to the scheme of the invention, the backup power automatic switching starting judgment logic is executed step by step, firstly, the tripping of each main supply line is judged after the device is charged, and then information such as whether each main supply line meets the no-current judgment condition and whether each main supply line is judged to be tripping is synthesized when the bus is in voltage loss so as to judge whether the starting condition of the backup power automatic switching device is met, and if the starting condition of the backup power automatic switching device is met, the backup power automatic switching function is started. The scheme of the invention is suitable for the spare power automatic switching start judgment with unlimited number of main power supply lines, for example, the spare power automatic switching start judgment is designed according to the scale of more commonly used outgoing lines, the spare power automatic switching device is suitable for various flexible operation modes of each transformer substation, the defect that the start judgment logic is more complex after the spare power automatic switching device of a multi-circuit main power supply line uses the line PT voltage of the main power supply line and the switch position of the main power supply line as the auxiliary judgment of the spare power automatic switching device start logic is overcome, the adaptability is strong, the logic design of a program is simplified, the working efficiency of the spare power automatic switching program design and the logic test inspection is improved, and the correct action rate of the spare power automatic switching device can.
Example 2
In the following description, a detailed description of the implementation of internal logic is made with an embodiment of three-circuit main supply line optimization:
A) step S101: step S101, after the spare power automatic switching device is charged, whether each main supply line trips or not is judged in real time before starting. The main supply line is judged to meet one of the following conditions for tripping:
a) the current value of the main supply line is smaller than the no-current fixed value, and the switch of the main supply line is changed from a closing state to an opening state;
b) the current value of the main supply line is smaller than the no-current fixed value, and the line PT voltage of the main supply line is changed from voltage to no-voltage.
In this embodiment, after the backup power automatic switching charging is completed, if the main power supply line 1 meets the above-mentioned line trip determination condition, the program sets the trip identifier on the main power supply line 1. The main supply lines 2 and 3 are processed in the same manner.
B) Step S102: and S102, when the operating bus is in voltage loss, judging whether the real-time current values of the main power supply lines are all smaller than the no-current fixed value.
In order to prevent the backup power automatic switching device from misoperation caused by the disconnection of the secondary circuit of the operating bus voltage, the backup power automatic switching device is provided with a line no-current fixed value. In this embodiment, when the operating bus is under a voltage loss, the real-time currents of the main supply line 1, the main supply line 2, and the main supply line 3 are respectively compared with the no-current constant value, and if the real-time currents of the three main supply lines are all smaller than the no-current constant value, the process proceeds to step S103. If the real-time current of any primary power supply line is greater than or equal to the no-current fixed value, the backup power automatic switching device is not started.
C) Step S103: after the step S102 determines that the real-time current value of each main supply line is smaller than the no-current fixed value, the flow proceeds to step S103 to check whether each main supply line meets the above-mentioned trip determination. In the step S101, the main supply lines have been subjected to line trip determination, and the trip identification state can be known from the trip flag of the program. If the three main supply lines have trip marks, the process goes to step S104. And if the trip mark of any primary power supply line is not set, the backup power automatic switching device is not started.
D) Step S104: and step S103, if the tripping condition of each main supply line is met, the step S104 is carried out, and the backup power automatic switching action logic is started after the set starting delay. The spare power automatic switching device is provided with a starting delay fixed value for matching with the reclosing function of the main power supply line and having necessary confirmation delay after the voltage of the bus is lost. A series of action logics after the backup automatic switching device is started are not described herein.
Another embodiment of the present invention may also be a four-way main supply line with internal logic implementation.
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (2)

1. A method for realizing simplified spare power automatic switching start-up judgment logic is characterized by comprising the following steps when a main supply line is larger than one circuit:
s101: after the spare power automatic switching device is charged, judging whether each main supply line trips or not in real time before starting;
s102: when the operation bus is in voltage loss, judging whether the real-time current values of all the main power supply lines are smaller than a no-current fixed value;
s103: if the judgment of S102 is yes, checking whether each main supply line meets the trip judgment;
s104: if the judgment of the S103 is yes, starting the backup power automatic switching action logic after the set starting delay;
before starting, whether each main supply line trips or not is judged in real time, and the judgment logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, and the line PT voltage of the main supply line is changed from voltage to no-voltage;
before starting, whether each main supply line trips or not is judged in real time, and the judgment logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, and the switch of the main supply line is changed from a closing state to an opening state;
after determining whether the real-time current values of the main power supply lines are all smaller than the no-current fixed value, the method further includes step S1021: if the real-time current value of the main power supply line is judged to be not smaller than the no-current fixed value when the operating bus is in voltage loss, the spare power automatic switching operation logic is not started, and the spare power automatic switching is discharged;
after checking whether each main supply line meets the trip judgment, the method further comprises step S1031: and if the main supply circuit does not meet the trip judgment, the spare power automatic switching action logic is not started, and the spare power automatic switching is discharged.
2. The method for implementing the simplified spare power automatic switching start-up decision logic according to claim 1, wherein the decision of whether each main supply line trips or not is performed in real time before the start-up, and the decision logic is as follows: the current value of the main supply line is smaller than the no-current fixed value, and the switch of the main supply line is changed from a closing state to an opening state.
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CN110174560B (en) * 2019-04-04 2021-04-16 河北电力装备有限公司 Relay protection device state variable testing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055235A (en) * 2011-01-12 2011-05-11 广东省电力调度中心 Spare power automatic switching method for 220kV side circuit and bus of 220kV transformer station
CN103532221A (en) * 2013-09-19 2014-01-22 南京南瑞集团公司 Spare-power automatic switching implementation method of lines under wiring and operating modes of self-adaptive 330kV substation
CN105449835A (en) * 2014-09-26 2016-03-30 南京南瑞继保电气有限公司 Regional spare power automatic switch method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055235A (en) * 2011-01-12 2011-05-11 广东省电力调度中心 Spare power automatic switching method for 220kV side circuit and bus of 220kV transformer station
CN103532221A (en) * 2013-09-19 2014-01-22 南京南瑞集团公司 Spare-power automatic switching implementation method of lines under wiring and operating modes of self-adaptive 330kV substation
CN105449835A (en) * 2014-09-26 2016-03-30 南京南瑞继保电气有限公司 Regional spare power automatic switch method

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