CN111817427B - 10 Kilovolt power distribution station backup automatic switching action state identification method based on tide anomaly analysis - Google Patents

10 Kilovolt power distribution station backup automatic switching action state identification method based on tide anomaly analysis Download PDF

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CN111817427B
CN111817427B CN202010316873.9A CN202010316873A CN111817427B CN 111817427 B CN111817427 B CN 111817427B CN 202010316873 A CN202010316873 A CN 202010316873A CN 111817427 B CN111817427 B CN 111817427B
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automatic switching
power
distribution station
kilovolt
electric quantity
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CN111817427A (en
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史媛
韩浩江
杨剑
夏澍
郑天奇
顾劲岳
张帆
陈佳瑜
徐迅
潘怡琪
王思麒
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State Grid Shanghai Electric Power Co Ltd
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State Grid Shanghai Electric Power 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
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
    • H02J2203/10—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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  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

A10 kilovolt power distribution station backup automatic switching action state identification method based on tide anomaly analysis belongs to the field of power grid operation management. Carrying out wiring mode division by taking the whole distribution station as a load object; establishing a change relation between different action states of the spare power automatic switching of the distribution station and the bus unbalance rate of the upper-level substation in a corresponding wiring mode; establishing a change relation between different action states of the spare power automatic switching equipment of the power distribution station and the line loss rate of the feeder line in a corresponding wiring mode; and establishing a corresponding rule of different action states of the automatic switching equipment of the power distribution station and a power flow change formula, and distinguishing abnormal action states of the automatic switching equipment of the power distribution station through rule matching. The automatic switching control method and the automatic switching control system can rapidly and accurately identify the automatic switching action state of the spare power in the power distribution station, improve the real-time monitoring rate of the field protection device, ensure the consistency of the pattern plate and the field in the nutrient-distribution-regulation through of the power distribution network, help the timely and accurate elimination of the abnormal automatic switching action state of the power distribution station, and improve the power supply reliability and the operation safety of the power distribution network. The method can be widely applied to the field of operation management of power distribution networks.

Description

10 Kilovolt power distribution station backup automatic switching action state identification method based on tide anomaly analysis
Technical Field
The invention relates to the field of power grid operation management, in particular to an action state identification method of a 10 kilovolt power distribution station system protection device.
Background
Because the requirements on the power supply reliability are higher and higher, the multi-circuit power supply circuit with two circuit lines and more is provided, and the reliability is generally improved by installing a standby incoming line automatic input device.
The automatic standby incoming line input device is simply called standby automatic switching. The application of the spare power automatic switching reduces the power failure time, ensures the continuity and reliability of the power supply of the system,
However, due to the fact that the digital sampling module of the device itself may have problems of distortion, jump and the like, under certain operation conditions, unexpected action conditions may occur, namely, the conditions of refusal operation in the case of a fault state and misoperation in the case of normal operation occur. Particularly, the current distribution station is not connected with the dispatching master station system yet, the state of the automatic switching operation cannot be known in time, and the automatic switching operation is carried out and then is in an abnormal operation mode for a long time; furthermore, the spare power automatic switching misoperation causes the system to be operated in a loop closing mode, so that the safety and stability of the system operation are reduced, and the timeliness of fault elimination cannot be guaranteed.
With the deep research of distribution network automation, the remote measurement, remote signaling and remote control functions of the distribution station are connected, so that the action information protected in the station is completely reported, unexpected action conditions of the distribution network system spare power automatic switching are found in real time, but under the actual technical condition that the current distribution network automation does not realize complete connection, how to accurately identify the action logic of the spare power automatic switching, accurately distinguish the action state from the false action state, and is an important measure for improving the safe and stable operation of a power grid and guaranteeing the power supply reliability of the system.
Disclosure of Invention
The invention aims to provide a 10 kilovolt power distribution station spare power automatic switching action state identification method based on power flow anomaly analysis. The method uses the whole 10 kilovolt power distribution station as a load object to carry out wiring mode division, realizes accurate identification of the automatic backup power switching action state through analysis of the trend change rule under different action states, can quickly and accurately identify the automatic backup power switching action state in the power distribution station, improves the real-time monitoring rate of a field protection device, is beneficial to timely and accurately eliminating the abnormal automatic backup power switching action state of the power distribution station, and improves the power supply reliability and the operation safety of the power distribution network.
The technical scheme of the invention is as follows: the 10 kilovolt power distribution station backup automatic switching action state identification method based on power flow anomaly analysis is characterized by comprising the following steps of:
(1) The method comprises the steps of carrying out wiring mode division by taking the whole 10 kilovolt distribution station as a load object, wherein the wiring mode comprises a double-loop wiring mode and a double-power supply wiring mode;
(2) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level substation in a double-loop wiring mode;
(3) Establishing a change relation between different action states of the 10 kilovolt spare power automatic switching of the power distribution station and the 10 kilovolt feed line loss rate in a double-loop wiring mode;
(4) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level substation in a dual-power-supply wiring mode;
(5) Establishing a change relation between different action states of the 10 kilovolt spare power automatic switching of the power distribution station and the 10 kilovolt feed line loss rate under a 'dual power supply' wiring mode;
(6) And establishing a corresponding rule of different action states of the 10 kilovolt power distribution station spare power automatic switching and a tide change formula, and distinguishing abnormal action states of the 10 kilovolt power distribution station spare power automatic switching through rule matching.
Specifically, in the step (1), the rule of wiring mode division of the 10 kv substation is as follows:
When the distribution station is a single load object, two incoming lines of the distribution station are from different outgoing lines of the same transformer substation and are mutually standby, the distribution station is a double-loop wiring mode;
When the distribution station is a single load object, two paths of incoming lines of the distribution station come from different outgoing lines of different substations and are mutually standby, the distribution station is a dual-power wiring mode;
if the double-loop wiring mode is adopted, the step (4) and the step (5) can be omitted;
If the dual power connection mode is adopted, the step (2) and the step (3) can be omitted.
Specifically, in the step (2), the change relation between the different action states of the 10 kv automatic switching of the power distribution station and the bus unbalance rate of the upper-level substation in the "dual-loop" wiring mode is as follows: when the spare power automatic switching is operated correctly,
Wherein: alpha A、α′A is the unbalance rate of the bus electric quantity when the substation A operates normally and is in the automatic switching state; w' ZR.A、W′ZC.A is the forward input electric quantity and the forward output electric quantity of the bus of the substation A in the standby automatic switching state respectively; w' FR.A、W′FC.A is the reverse input electric quantity and the reverse output electric quantity of the bus of the substation A in the standby automatic switching state respectively;
When the spare power automatic switching is in error action,
Wherein: alpha' A is the unbalance rate of the bus electric quantity when the spare power automatic switching misoperation state of the transformer substation A is adopted; w' ZR.A、W″ZC.A、 W″FR.A、W″FC.A is the forward input electric quantity, the forward output electric quantity, the reverse input electric quantity and the reverse output electric quantity of the bus of the substation A in the standby automatic switching state respectively; w ' F.QF1、W″F.QF2 is the reverse electric quantity of the incoming line switches QF1', QF2' when the spare power automatic switching is in a misoperation state.
Specifically, in the step (3), the relation between different action states of the spare power automatic switching and the 10 kv feeder line loss rate change in the "dual-loop" wiring mode is as follows: when the spare power automatic switching is operated correctly,
In the formula, eta' Y.L1、η′Y.L2 is the original statistic value of the line loss rate of the lines L1 and L2 after the spare power automatic switching action; w ZGF.L1、WZGF.L2 is the original statistical value of the forward power supply quantity of the lines L1 and L2 respectively; w SF.L1、WSF.L2 is the original statistical value of the sales power of the lines L1 and L2 respectively; η' T.L12 is the packing line loss rate of the lines L1 and L2; η' T.L1、η′T.L2 is the actual line loss rate correction value of the lines L1 and L2 respectively; a is the load proportionality coefficient of the station A of the distribution station of the line L1;
When the spare power automatic switching is in error action,
In the formula, eta' Y.L1、η″Y.L2 is the original statistic value of the line loss rate of the lines L1 and L2 after the spare power automatic switching misoperation; w ZGF.L1、WZGF.L2 is the original statistical value of the forward power supply quantity of the lines L1 and L2 respectively; w FGF.L1、WFGF.L2 is the original statistical value of the reverse power supply quantity of the lines L1 and L2 respectively; w SF.L1、WSF.L2 is the original statistical value of the sales power of the lines L1 and L2 respectively; η "T.L1、η″T.L2 is the line loss rate correction actual value of the lines L1, L2, respectively.
Further, in the step (4), the change relation between the different action states of the 10 kv automatic switching of the power distribution station and the bus unbalance rate of the upper-level substation in the "dual power" wiring mode is as follows: when the spare power automatic switching is operated correctly,
Wherein: alpha B、α′B is the bus electricity unbalance rate of the transformer substation B in normal operation and the spare power automatic switching state; w' ZR.B、W′ZC.B is the forward input electric quantity and the forward output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively; w' FR.B、W′FC.B is the reverse input electric quantity and the reverse output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively:
When the spare power automatic switching is in error action,
Wherein: alpha' A、α″B is the unbalance rate of the bus electric quantity when the spare power automatic switching misoperation state of the transformer substation A is adopted; w' ZR.B、W″ZC.B、 W″FR.B、W″FC.B is the forward input electric quantity, the forward output electric quantity, the reverse input electric quantity and the reverse output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively; w ' F.QF1、W″F.QF2 is the reverse electric quantity of the incoming line switches QF1', QF2' when the spare power automatic switching is in a misoperation state.
Further, in the step (5), the relation between the different action states of the spare power automatic switching and the 10 kv feeder line loss rate change in the "dual power" wiring mode is as follows: when the spare power automatic switching is operated correctly,
When the spare power automatic switching is in error action,
Specifically, in the step (6), the different action states of the 10kv automatic switching station and the change rule of the tide flow correspond to:
① In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (1) and the change of the 10 kilovolt feeder line loss rate meets the formula (3), the automatic switching action state is the correct action;
② In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (2) and the change of the 10 kilovolt feeder line loss rate meets the formula (4), the automatic switching action state is false action;
③ In the dual-power wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formulas (5) and (6) and the change of the 10 kilovolt feeder line loss rate meets the formula (9), the automatic switching action state is the correct action;
④ In the dual-power wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formulas (7) and (8) and the change of the 10 kilovolt feeder line loss rate meets the formula (10), the spare power automatic switching action state is false action;
The identification of the abnormal action state of the 10 kilovolt power distribution station spare power automatic switching through rule matching comprises the steps of respectively calculating the change relation of the unbalance rate of the bus of the upper-level transformer substation and the change relation of the line loss rate of the 10 kilovolt feeder line, and carrying out state identification according to the corresponding rules from the rules ① to ④.
Compared with the prior art, the invention has the advantages that:
According to the technical scheme, the automatic backup power switching operation state is accurately identified through the analysis of the tide change rule under different operation states, so that the problems of hysteresis and incompleteness of the automatic backup power switching operation state found by means of manual inspection in the past are solved, meanwhile, the consistency of a plate and a site in the operation-distribution-adjustment through of the power distribution network is improved, the automatic backup power switching operation state identification method has important significance in timely and accurately eliminating abnormal operation states of the power distribution station, and the power supply reliability and the operation safety of the power distribution network are further improved.
Drawings
FIG. 1 is a workflow diagram of a method for identifying the automatic switching operation state of a 10 kilovolt power distribution station according to the present invention;
fig. 2 is a topology of a 10 kv substation;
FIG. 3 is a graph showing bus bar imbalance rate data for a 10 kilovolt substation upper level substation;
Fig. 4 shows line loss data for a 10 kv feeder of a 10 kv substation.
Detailed Description
The invention is further described below with reference to the drawings and examples.
In fig. 1, the technical scheme of the invention provides a 10 kv power distribution station backup automatic switching action state identification method based on power flow anomaly analysis, which is characterized in that the identification method comprises the following steps:
the method comprises the steps of carrying out wiring mode division by taking the whole 10 kilovolt distribution station as a load object, wherein the wiring mode comprises a double-loop wiring mode and a double-power supply wiring mode;
Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the unbalance rate of the bus of the upper-level substation in a double-loop wiring mode;
Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feeder line loss rate in a double-loop wiring mode;
establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the unbalance rate of the bus of the upper-level substation in a dual-power-supply wiring mode;
Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feeder line loss rate under a 'dual power supply' wiring mode;
And establishing a corresponding rule of different action states of the 10 kilovolt power distribution station spare power automatic switching and a tide change formula, and distinguishing abnormal action states of the 10 kilovolt power distribution station spare power automatic switching through rule matching.
By adopting the technical scheme of the invention, the action state of the automatic backup power switching in the 10kV power distribution station can be rapidly and accurately identified, and the method has important significance in improving the real-time monitoring rate of the on-site protection device and the safe and stable operation level of the power grid.
Examples:
Taking a certain 10 kilovolt power distribution station LX182 as an example, a topological diagram is shown in fig. 2, the bus unbalance rate of the upper-level power transformation station CY station and the line loss rate of 210 kilovolt feeder lines Caon 7CY 1222A/Caon 57YLQ 768A, caon 17YLQ 768B/Caon 67SQ300 and 3B are simultaneously abnormal, and the data after the abnormal are shown in fig. 3 and 4, so that the spare power automatic switching action state of the power distribution station is judged.
(1) The wiring mode division is carried out by taking the whole 10 kilovolt distribution station as a load object, and the wiring mode division comprises a double-loop wiring mode and a double-power supply wiring mode: according to fig. 2, lx182 stations are superordinate from different outgoing lines of the same substation CY station and are each mutually standby, thus being a dual-loop wiring mode. In the dual loop mode, steps (4) and (5) are omitted.
(2) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level transformer station in a 'double-loop' wiring mode:
When the spare power automatic switching is operated correctly,
Wherein: alpha CY、α′CY is the unbalance rate of the bus electric quantity when the upper-level substation CY stands in the normal running state of the LX182 power distribution station and the spare power automatic switching state; w' ZR.CY、W′ZC.CY is the forward input electric quantity and the forward output electric quantity of a bus of a CY station in the automatic backup switching operation state of the LX182 power distribution station respectively; w' FR.CY、W′FC.CY is the reverse input electric quantity and the reverse output electric quantity of the bus of the CY station in the spare power automatic switching action state of the LX182 power distribution station respectively.
When the spare power automatic switching is in error action,
Wherein: alpha' CY is the unbalanced rate of the bus electric quantity when the upper-level substation CY stands in the spare power automatic switching misoperation state of the LX182 power distribution station; w' ZR.CY、W″ZC.CY、W″FR.CY、W″FC.CY is respectively the forward input electric quantity, the forward output electric quantity, the reverse input electric quantity and the reverse output electric quantity of a bus of a CY station in the spare power automatic switching action state of the LX182 power distribution station; w F.C7、 W″F.C17 is the reverse electric quantity of the incoming line switches Cao 7 and Cao 17 when the spare power automatic switching misoperation state of the LX182 power distribution station is respectively.
(3) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feed line loss rate in a 'double-loop' wiring mode:
When the spare power automatic switching is operated correctly,
In the formula, eta' Y.L1、η′Y.L2 is the original statistical value of the line loss rate of the lines Cao 7 and Cao 17 after the spare power automatic switching action of the LX182 power distribution station respectively; w ZGF.C7、WZGF.C17 is the original statistical value of the forward power supply quantity of the lines Cao 7 and Cao 17 respectively; w SF.C7、WSF.C17 is the original statistic value of the sales quantity of the circuits Cao 7 and Cao 17 respectively; η' T.C717 is the line loss rate of the wiring of the Cao 7 and the Cao 17; η' T.C7、η′T.C17 is the actual line loss rate correction value of the lines Cao 7 and Cao 17 respectively; a is the load proportionality coefficient of the line Cao 7 to the LX182 power distribution station.
When the spare power automatic switching is in error action,
In the formula, eta' Y.C7、η″Y.C17 is the original statistical value of the line loss rate of the line Cao 7 and Cao 17 after the spare power automatic switching malfunction of the LX182 power distribution station respectively; w ZGF.C7、WZGF.C17 is the original statistical value of the forward power supply quantity of the lines Cao 7 and Cao 17 respectively; w FGF.C7、WFGF.C17 is the original statistic value of reverse power supply quantity of the lines Cao 7 and Cao 17 respectively; w SF.C7、WSF.C17 is the original statistic value of the sales quantity of the lines Cao 7 and Cao 17 respectively; η "T.C7、η″T.C17 is the actual line loss rate correction value for lines Cao 7 and Cao 17, respectively.
(4) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level transformer station under a 'dual power supply' wiring mode: according to the judgment result of the step (1), the step is omitted.
(5) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feed line loss rate in a 'dual power supply' wiring mode: according to the judgment result of the step (1), the step is omitted.
(6) And establishing a law corresponding to the power flow change formula of different action states of the 10 kilovolt power distribution station spare power automatic switching, and distinguishing the abnormal action states of the 10 kilovolt power distribution station spare power automatic switching through rule matching.
The corresponding rules of the 10 kilovolt distribution station spare power automatic switching different action states and the trend change formula are as follows:
① In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (1) and the change of the 10 kilovolt feeder line loss rate meets the formula (3), the automatic switching action state is the correct action;
② In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (2) and the change of the 10 kilovolt feeder line loss rate meets the formula (4), the spare power automatic switching action state is false action;
③ In the dual-power wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formulas (5) and (6) and the change of the 10 kilovolt feeder line loss rate meets the formula (9), the automatic switching action state is the correct action;
④ In the dual-power wiring mode, when the bus unbalance rate change of the upper-level substation meets the formulas (7) and (8) and the 10 kilovolt feeder line loss rate change meets the formula (10), the spare power automatic switching action state is false action.
The bus unbalance rate change relation of the upper-level substation is as follows:
The calculation result conforms to the formula (2).
The change relation of the 10 kilovolt feeder line loss rate is as follows:
Before correction: η T.C7＝49.63％≥10％,ηT.C17 =17.79%. Gtoreq.10%;
after correction:
The calculation result conforms to the formula (4).
Carrying out state identification according to a formula correspondence rule: the wiring mode of the power distribution station is double-loop wiring, the change of the unbalance rate of the bus of the upper-level substation meets the formula (2), and the change of the line loss rate of the 10 kilovolt feeder line meets the formula (4), so that the spare power automatic switching of the power distribution station is judged to be in a false operation state.
According to the technical scheme, the action state of the spare power automatic switching in the 10kV power distribution station can be rapidly and accurately identified, the real-time monitoring rate of the field protection device is increased, the problems that hysteresis and incompleteness of the action state of the spare power automatic switching are found by means of manual inspection in the past are solved, meanwhile, the consistency of a plate and the field in the nutrition-distribution-adjustment through process of the power distribution network is improved, the method has important significance in timely and accurately eliminating abnormal action states of the spare power automatic switching of the power distribution station, and the power supply reliability and the operation safety of a power distribution network are further improved. .
The invention can be widely applied to the field of operation management of power distribution networks.

Claims (3)

1. The 10 kilovolt power distribution station backup automatic switching action state identification method based on tide anomaly analysis is characterized by comprising the following steps of:
(1) The method comprises the steps of carrying out wiring mode division by taking the whole 10 kilovolt distribution station as a load object, wherein the wiring mode comprises a double-loop wiring mode and a double-power supply wiring mode;
(2) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level substation in a double-loop wiring mode;
(3) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feeder line loss rate in a double-loop wiring mode;
(4) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the bus unbalance rate of the upper-level substation in a dual-power-supply wiring mode;
(5) Establishing a change relation between different action states of the 10 kilovolt power distribution station spare power automatic switching and the 10 kilovolt feeder line loss rate under a dual-power-supply wiring mode;
(6) Establishing a corresponding rule of different action states of the 10 kilovolt power distribution station spare power automatic switching and a tide change formula, and distinguishing abnormal action states of the 10 kilovolt power distribution station spare power automatic switching through rule matching;
In the step (2), the change relation between different action states of the 10 kv automatic switching of the power distribution station and the bus unbalance rate of the upper-level substation in the "dual-loop" wiring mode is as follows: when the spare power automatic switching is operated correctly,
Wherein: alpha A、α′A is the unbalance rate of the bus electric quantity when the substation A operates normally and is in the automatic switching state; w' ZR.A、W′ZC.A is the forward input electric quantity and the forward output electric quantity of the bus of the substation A in the standby automatic switching state respectively; w' FR.A、W′FC.A is the reverse input electric quantity and the reverse output electric quantity of the bus of the substation A in the standby automatic switching state respectively;
When the spare power automatic switching is in error action,
Wherein: alpha' A is the unbalance rate of the bus electric quantity when the spare power automatic switching misoperation state of the transformer substation A is adopted; w' ZR.A、W″ZC.A、W″FR.A、W″FC.A is the forward input electric quantity, the forward output electric quantity, the reverse input electric quantity and the reverse output electric quantity of the bus of the substation A in the standby automatic switching state respectively; w ' F.QF1、W″F.QF2 is the reverse electric quantity of the incoming line switches QF1', QF2' when the spare power automatic switching is in a misoperation state;
in the step (3), the relation between the different action states of the spare power automatic switching and the 10 kv feeder line loss rate change in the "dual-loop" wiring mode is as follows: when the spare power automatic switching is operated correctly,
In the formula, eta' Y.L1、η′Y.L2 is the original statistic value of the line loss rate of the lines L1 and L2 after the spare power automatic switching action; w ZGF.L1、WZGF.L2 is the original statistical value of the forward power supply quantity of the lines L1 and L2 respectively; w SF.L1、WSF.L2 is the original statistical value of the sales power of the lines L1 and L2 respectively; η' T.L12 is the packing line loss rate of the lines L1 and L2; η' T.L1、η′T.L2 is the actual line loss rate correction value of the lines L1 and L2 respectively; a is the load proportionality coefficient of the station A of the distribution station of the line L1;
When the spare power automatic switching is in error action,
In the formula, eta' Y.L1、η″Y.L2 is the original statistic value of the line loss rate of the lines L1 and L2 after the spare power automatic switching misoperation; w ZGF.L1、WZGF.L2 is the original statistical value of the forward power supply quantity of the lines L1 and L2 respectively; w FGF.L1、WFGF.L2 is the original statistical value of the reverse power supply quantity of the lines L1 and L2 respectively; w SF.L1、WSF.L2 is the original statistical value of the sales power of the lines L1 and L2 respectively; η' T.L1、η″T.L2 is the line loss rate correction actual value of the lines L1 and L2 respectively;
In the step (4), the change relation between different action states of the 10 kv automatic switching of the power distribution station and the bus unbalance rate of the upper-level substation in the 'dual power supply' wiring mode is as follows: when the spare power automatic switching is operated correctly,
Wherein: alpha B、α′B is the unbalance rate of the bus electric quantity when the substation B operates normally and is in the automatic switching state; w' ZR.B、W′ZC.B is the forward input electric quantity and the forward output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively; w' FR.B、W′FC.B is the reverse input electric quantity and the reverse output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively:
When the spare power automatic switching is in error action,
Wherein: alpha' A、α″B is the unbalance rate of the bus electric quantity when the spare power automatic switching misoperation state of the transformer substation A is adopted; w' ZR.B、W″ZC.B、W″FR.B、W″FC.B is the forward input electric quantity, the forward output electric quantity, the reverse input electric quantity and the reverse output electric quantity of the bus of the transformer substation B in the standby automatic switching state respectively; w ' F.QF1、W″F.QF2 is the reverse electric quantity of the incoming line switches QF1', QF2' when the spare power automatic switching is in a misoperation state;
in the step (5), the relation between the different action states of the spare power automatic switching and the 10 kv feeder line loss rate change in the "dual power" wiring mode is as follows: when the spare power automatic switching is operated correctly,
When the spare power automatic switching is in error action,
2. The 10 kv substation backup power automatic switching action state identification method based on the power flow anomaly analysis according to claim 1, wherein in the step (1), a 10 kv substation wiring mode division rule is as follows:
When the distribution station is a single load object, two incoming lines of the distribution station are from different outgoing lines of the same transformer substation and are mutually standby, the distribution station is a double-loop wiring mode;
When the distribution station is a single load object, two paths of incoming lines of the distribution station come from different outgoing lines of different substations and are mutually standby, the distribution station is a dual-power wiring mode;
if the double-loop wiring mode is adopted, the step (4) and the step (5) can be omitted;
If the dual power connection mode is adopted, the step (2) and the step (3) can be omitted.
3. The 10 kv substation backup power automatic switching action state identification method based on the power flow anomaly analysis according to claim 1, wherein in the step (6), the different action states of the 10 kv substation backup power automatic switching correspond to the power flow change rule:
① In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (1) and the change of the 10 kilovolt feeder line loss rate meets the formula (3), the automatic switching action state is the correct action;
② In the double-circuit line wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formula (2) and the change of the 10 kilovolt feeder line loss rate meets the formula (4), the automatic switching action state is false action;
③ In the dual-power wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formulas (5) and (6) and the change of the 10 kilovolt feeder line loss rate meets the formula (9), the automatic switching action state is the correct action;
④ In the dual-power wiring mode, when the change of the bus unbalance rate of the upper-level substation meets the formulas (7) and (8) and the change of the 10 kilovolt feeder line loss rate meets the formula (10), the spare power automatic switching action state is false action;
The identification of the abnormal action state of the 10 kilovolt power distribution station spare power automatic switching through rule matching comprises the steps of respectively calculating the change relation of the unbalance rate of the bus of the upper-level transformer substation and the change relation of the line loss rate of the 10 kilovolt feeder line, and carrying out state identification according to the corresponding rules from the rules ① to ④.
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