CN104319871A - Transformer station domain island protection and backup automatic switching integrated method - Google Patents

Transformer station domain island protection and backup automatic switching integrated method Download PDF

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Publication number
CN104319871A
CN104319871A CN201410521937.3A CN201410521937A CN104319871A CN 104319871 A CN104319871 A CN 104319871A CN 201410521937 A CN201410521937 A CN 201410521937A CN 104319871 A CN104319871 A CN 104319871A
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China
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voltage side
bus
auto restart
prepared auto
transformer station
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CN201410521937.3A
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CN104319871B (en
Inventor
温靖华
陈永华
王小立
许士光
罗美玲
唐冠军
徐海波
罗剑波
李雪明
陈汹
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State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Ningxia Electric Power Co Ltd
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State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Ningxia Electric Power Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Abstract

The invention relates to a transformer station domain island protection and backup automatic switching integrated method. The method is characterized by comprising the following steps: (1), acquiring the electrical amount information and switch state information at the high voltage side, the intermediate voltage side and the low voltage side of a transformer station in real time, and according to whether backup automatic switching upkeep pressure plates are thrown or retreat, identifying the current running states of elements at the high voltage side, the intermediate voltage side and the low voltage side of the transformer station; and (2), according to actual wiring conditions and onsite operation demands, through apparatus function pressure plates, selecting whether the backup automatic switching functions and island protection functions of the high voltage side, the intermediate voltage side and the low voltage side are open; and through apparatus software control words, setting backup switching modes of the high voltage side, the intermediate voltage side and the low voltage side for coupling to the previously identified operation states of the elements at the high voltage side, the intermediate voltage side and the low voltage side of the transformer station, and if coupling fails, sending alarm signals, locking an apparatus and discharging. The method firstly has an island protection function, can rapidly detect an island state and an island scope existing in the transformer station, and jumps away from photovoltaic power station grid connected switches in the corresponding scope.

Description

A kind of anti-island protect of substation areas of transformer station and prepared auto restart integral method
Technical field
The present invention relates to the anti-island protect of a kind of substation areas of transformer station and prepared auto restart integral method.
Background technology
Along with increase and a large amount of photo-voltaic power supplies access transformer station of load, the operational reliability of transformer station is more and more important.After photo-voltaic power supply access transformer station, once transformer station's main power supply disconnects, when transformer station is in island state, there is higher residual voltage by making substation bus bar in the existence of photovoltaic plant, backup auto-activating device is transported can not action message, thus finally causes transformer station entirely to stand power outage.Therefore, how to detect island state at transformer substation side rapidly and to excise the grid-connected switch of photovoltaic plant, becoming the key improving transformer station's power supply reliability.
Simultaneously, traditional prepared auto restart equipment is all design based on same electric pressure, standby throwing function can only be realized under same electric pressure, if will realize high simultaneously, in, the prepared auto restart function of low-pressure side, then must at height, in, low-pressure side increases a backup auto-activating device separately, such way not only increases investment cost and the management difficulty of transformer station, even and if also there are some specific questions configuring in multiple prepared auto restart situation, such as high pressure lead-in circuit breaker tripping, or high-pressure side protection's dead-zone fault, all by causing, original high pressure inlet wire prepared auto restart scheme is standby throws unsuccessfully, transformer station is caused entirely to stand power outage.
Summary of the invention
The object of this invention is to provide the anti-island protect of a kind of substation areas of transformer station and prepared auto restart integral method; the requirement of 110kV transformer station for anti-isolated island and multistage prepared auto restart can be met; the tripping of inlet wire bus can also be solved, protection's dead-zone fault causes transformer station's full cut-off problem, thus prevent transformer station's full cut-off to greatest extent.
A kind of anti-island protect of substation areas of transformer station and prepared auto restart integral method, its special feature is, comprises the steps:
(1) whether the electric quantity information of Real-time Collection transformer station high, medium and low voltage side and switching-state information, drop in conjunction with prepared auto restart maintenance pressing plate or exit, identifying the running status that transformer station's high, medium and low voltage side element is current;
(2) according to physical cabling situation and on-the-spot operation demand, by (prepared auto restart) apparatus function pressing plate, the prepared auto restart function of high, medium and low voltage side and anti-island protect is selected whether to open; By (prepared auto restart) device software control word setting high, medium and low voltage side for throwing mode, and mate with the running status of the high, medium and low voltage side element identified before, if do not mated, send out alarm signal, the locking of (prepared auto restart) device is discharged; When the standby of high, medium and low voltage side throws function and all openings of anti-island protect function, and the standby throwing mode of high, medium and low voltage side is all mated with the state of identification, then proceed to next step, otherwise, repeat step (2);
(3) detect prepared auto restart and whether meet charge condition, namely when prepared auto restart function and all openings of anti-island protect function of high, medium and low voltage side, then need three sides all to meet charge condition and just start device charging, otherwise, repeat step (3);
(4) when after prepared auto restart charging complete, if anti-island protect function pressing plate drops into, be then introduced into island protect flow process, otherwise directly enter step (5) i.e. prepared auto restart enable logic and judge flow process;
(5) enter prepared auto restart enable logic to judge, specifically first judge high-voltage side bus whether decompression, if high side bus voltage U<U min, this U minrepresent minimum amount of voltage that, then sentence bus loss of pressure, directly enter the improvement high voltage side lead-in prepared auto restart motion flow in step (6);
(6) when high-voltage side bus decompression, enter and improve high voltage side lead-in prepared auto restart logic flow, specifically first judge high voltage fault place, supply line fault if just main and can confirm that circuit breaker disconnects, then restore electricity by closing available circuit; If there is dead band or cannot confirm whether lead-in circuit breaker disconnects in fault, then by first high jump pressure bus connection switch and with in the main main transformer for the same bus of connection, low-side switch, after fault section isolation, close again extension wire switch and in, low-pressure side bus connection switch, thus recover transformer station power.
Electric quantity information described in step (1) comprises: the univoltage of non-bus bar elements and three-phase current, two groups of line voltage signals of bus bar elements; Switching-state information comprises HWJ and the KKJ signal of circuit breaker; Element running status is divided into circuit, mother and bus three class component state, and wherein, line status is divided into four kinds: maintenance, run, can standbyly throw and stop transport; Mother state divides four kinds: run, overhaul, can standbyly throw and stop transport; Bus corresponding states divides three kinds: maintenance, operation and stoppage in transit.
Prepared auto restart software control word in step (2) arranges the standby throwing mode for setting each side, and wherein the soft control word setting principle of the standby throwing in high, medium and low voltage side is consistent.
Whether the function of mating specifically input by digital examination running status described in step (2) is consistent with substation's running status.
Described in step (3), charge condition specifically comprises:
1) the standby charge condition thrown of high voltage side lead-in is: " high voltage standby hauls oneself willingly into function pressing plate " is in input state; It is the standby throwing of inlet wire that high voltage standby throws soft control word; Bus connection switch is in co-bit; Two sections of buses all meet arbitrary group of line voltage > Uyy, and this Uyy representative has compression set value; Also need standby circuit of throwing to meet the following conditions: switch HWJ is point position simultaneously; Standby throwing circuit 2 voltage >Uyy, this Uyy representative has compression set value; Corresponding maintenance pressing plate is in exit status; Corresponding KKJ opens into being 0 after closing, when above condition be " with " logical relation, namely meet charge condition;
2) in, the standby charge condition thrown of low-pressure side mother is: " in, low pressure prepared auto restart function pressing plate " is in input state; In, lowly standby throw soft control word and drop into; In, low mother maintenance pressing plate exit and mother block switch in a point position, open into being 0 after corresponding KKJ conjunction; In, low two sections of buses all meet arbitrary phase voltage > Uyy, this Uyy representative has compression set value; When above condition be " with " logical relation, namely meet charge condition.
Island protect flow process in step (4) specifically refers to and judges whether to there is isolated island by the state of cut-offfing of each side switch, and concrete logical relation is as follows:
110kV bus sentences anti-island protect function: when the main confession line switching of operation trips, namely 110kV bus meets isolated island criterion; Device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch;
35kV I, II mother sentences anti-island protect function: sentencing under 35kV I, II mother operation prerequisite, arbitrary condition meets below, and namely 35kV I, II mother meets isolated island criterion, and device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch;
1) 35kV bus connection switch divides, and #1, #2 main transformer uprises or becomes breaker in middle tripping;
2) 35kV bus connection switch closes, #1 and #2 main transformer uprises or becomes breaker in middle tripping;
3) 35kV bus connection switch closes, and #1, #2 main transformer maintenance pressing plate is thrown, and #2, #1 main transformer uprises or becomes breaker in middle tripping;
4) 35kV bus connection switch closes, and #2, #1 main transformer maintenance pressing plate is thrown, and #1, #2 main transformer uprises or becomes breaker in middle tripping;
10kV I, II mother sentences anti-island protect function logic and above-mentioned 35kV I, II mother, and to sentence anti-island protect logic consistent.
Described high-voltage side fault place in step (6) differentiates and specifically refers to that if inlet wire fault current points to circuit, then fault occurs on the line by detecting inlet wire and failure judgement region is come in bus connection switch fault current direction; If inlet wire fault current points to bus, then fault occurs on bus or between inlet wire CT and bus; If non-faulty current on mother CT, then fault occurs in and connects on the main bus supplying inlet wire, otherwise then fault occurs on the bus of connection available inlet wire.
When the non-decompression of high-voltage side bus in step (5), and in only having, low-voltage bus bar decompression, then in entering, low voltage activate flow process.
The invention provides a kind of anti-island protect in territory, station based on same table apparatus and prepared auto restart integral method, first the method possesses anti-island protect function, the island state and isolated island scope that exist in transformer station can be detected rapidly, and the photovoltaic electric station grid connection switch in tripping respective range; Secondly the prepared auto restart function in each voltage class ranges can be selected flexibly; Last on high-tension side specific question, also improve high voltage side lead-in prepared auto restart action logic, by the action of multiple-pole switch, carried out the conversion of transformer station's supply power mode, prevented transformer station's full cut-off.
Accompanying drawing explanation
Fig. 1 is the anti-island protect in territory, middle station of the present invention and prepared auto restart overall logic flow chart;
Fig. 2 is improvement high voltage side lead-in of the present invention standby throwing logic diagram;
Fig. 3 is circuit running status decision logic figure of the present invention;
Fig. 4 is mother running status decision logic figure of the present invention;
Fig. 5 is bus running status decision logic figure of the present invention;
Fig. 6 is high-voltage side fault of the present invention some position judgment logic diagram;
Fig. 7 is overall structure module figure of the present invention;
Fig. 8 is for of the present invention adapted to typical case is containing photovoltaic access 110kV bus arrangement figure.
Embodiment
The invention provides the anti-island protect of a kind of substation areas of transformer station and prepared auto restart integral method, the method flow process as shown in Figure 1, comprises the steps:
(1) whether the electric quantity information of Real-time Collection transformer station high, medium and low voltage side and switching-state information, drop in conjunction with prepared auto restart maintenance pressing plate or exit, identifying the running status that transformer station's high, medium and low voltage side element is current;
(2) according to physical cabling situation and on-the-spot operation demand, by apparatus function pressing plate, the prepared auto restart function of high, medium and low voltage side and anti-island protect is selected whether to open; By device software control word setting high, medium and low voltage side for throwing mode, and mate with the running status of the high, medium and low voltage side element identified before, if do not mated, send out alarm signal, device locking is discharged; If the standby of high, medium and low voltage side throws function and all openings of anti-island protect function, need the standby throwing mode of high, medium and low voltage side all to mate with the state of identification, just can proceed to next step, otherwise, repeat step (2);
(3) detect prepared auto restart and whether meet charge condition, if the prepared auto restart function of high, medium and low voltage side and all openings of anti-island protect function, then need three sides all to meet charge condition and just start device charging, otherwise, repeat step (3);
(4) after prepared auto restart charging complete, if anti-island protect function pressing plate drops into, be then introduced into island protect flow process, otherwise directly enter step (5) i.e. prepared auto restart enable logic judgement;
(5) enter prepared auto restart enable logic to judge, wherein first judge high-voltage side bus whether decompression, if high side bus voltage U<U min, this U minrepresent minimum amount of voltage that, can determine according to conventional wisdom calculating or practical experience.Then sentence bus loss of pressure, directly enter the improvement high voltage side lead-in prepared auto restart motion flow in step (6); If the non-decompression of high-voltage side bus, and in only having, low-voltage bus bar decompression, then in entering, low voltage activate flow process, in, low-pressure side motion flow and conventional prepared auto restart keep strokes, no longer describe herein;
(6) when high-voltage side bus decompression, enter and improve high voltage side lead-in prepared auto restart logic flow, specifically first judge high voltage fault place, supply line fault if just main and can confirm that circuit breaker disconnects, then restore electricity by closing available circuit; If there is dead band or cannot confirm whether lead-in circuit breaker disconnects in fault, then by first high jump pressure bus connection switch and with in the main main transformer for the same bus of connection, low-side switch, after fault section isolation, close again extension wire switch and in, low-pressure side bus connection switch, recover transformer station to power, the high voltage side lead-in prepared auto restart logic flow of improvement is as Fig. 2.
Described in step (1), electric quantity information comprises: the univoltage of non-bus bar elements and three-phase current, two groups of line voltage signals of bus bar elements; Switching-state information comprises HWJ and the KKJ signal of circuit breaker; Element running status is divided into circuit, mother and bus three class component state, and wherein, line status is divided into four kinds: maintenance, run, can standbyly throw and stop transport, and its counterlogic judges that flow process is as accompanying drawing 3; Mother state divides four kinds: run, overhaul, can standbyly throw and stop transport, its counterlogic judges that flow process is as accompanying drawing 4; Bus corresponding states divides three kinds: maintenance, operation and stoppage in transit, its counterlogic flow process is as accompanying drawing 5.
Prepared auto restart software control word described in step (2) arranges the standby throwing mode for setting each side.Wherein the soft control word setting principle of the standby throwing in high, medium and low voltage side is consistent, for high-pressure side, throw under function pressing plate drops at high voltage standby, if two bus paired runnings and when having extension wire, then standby throwing of high voltage side lead-in should be set to 1, and mother standby throwing in high-pressure side should be set to 0; If when two bus fanout operations, the standby throwing of high voltage side lead-in is 0, and standby throwing of mother is 1; Exit if high voltage standby throws function pressing plate, it is invalid that the soft control word of standby throwing is arranged.
The coupling of state described in step (2) is for checking that whether input function is consistent with substation's running status, and it corresponds to following table 1:
Table 1 function pressing plate and detected state matching list
Described in step (3), charge condition specifically comprises:
1) the throwing charge condition that high voltage side lead-in is standby is: " high voltage standby hauls oneself willingly into function pressing plate " is in input state; It is the standby throwing of inlet wire that high voltage standby throws soft control word; Bus connection switch is in co-bit; Two sections of buses all meet arbitrary group of line voltage > Uyy (having compression set value); Also need standby circuit of throwing to meet the following conditions: switch HWJ is point position simultaneously; Standby throwing circuit 2 voltage >Uyy (having compression set value). 3. corresponding maintenance pressing plate is in exit status; Corresponding KKJ opens into being 0 after closing.Above condition is " with " logical relation, just meet charge condition.
2) in, the standby charge condition thrown of low-pressure side mother is: " in, low pressure prepared auto restart function pressing plate " is in input state; In, lowly standby throw soft control word and drop into; In, low mother maintenance pressing plate exit and mother (segmentation) switch in a point position, open into being 0 after corresponding KKJ conjunction; In, low two sections of buses all meet arbitrary phase voltage > Uyy (having compression set value); Upper condition is " with " logical relation, just meet charge condition.
Island protect flow process in step (4) specifically refers to and judges whether to there is isolated island by each side switch state of cut-offfing, and concrete logical relation is as follows:
110kV bus sentences anti-island protect function: when the main confession line switching of operation trips, namely 110kV bus meets isolated island criterion; Device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch;
35kV I (II) mother sentences anti-island protect function: sentencing under 35kV I (II) mother operation prerequisite; arbitrary condition meets below; namely 35kV I (II) mother meets isolated island criterion, and device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch.
1) 35kV bus connection switch divides, and #1 (#2) main transformer uprises or becomes breaker in middle tripping;
2) 35kV bus connection switch closes, #1 and #2 main transformer uprises or becomes breaker in middle tripping;
3) 35kV bus connection switch closes, and #1 (#2) main transformer maintenance pressing plate is thrown, and #2 (#1) main transformer uprises or becomes breaker in middle tripping;
4) 35kV bus connection switch closes, and #2 (#1) main transformer maintenance pressing plate is thrown, and #1 (#2) main transformer uprises or becomes breaker in middle tripping.
10kV I (II) mother sentences anti-island protect function logic and 35kV I (II) mother, and to sentence anti-island protect logic consistent, not repeated description.
Described high-voltage side fault place in step (6) differentiates and specifically refers to that if inlet wire fault current points to circuit, then fault occurs on the line by detecting inlet wire and failure judgement region is come in bus connection switch fault current direction; If inlet wire fault current points to bus, then fault occurs on bus or between inlet wire CT and bus; If non-faulty current on mother CT, then fault occurs in and connects on the main bus supplying inlet wire, otherwise then fault occurs on the bus of connection available inlet wire.The following accompanying drawing 6 of idiographic flow that high-voltage side fault differentiates.
The overall flow realizing the inventive method contains four large (function) modules: status monitoring and function match module, charging module, anti-island protect module, prepared auto restart action module.Their relation accompanying drawing 7.
Embodiment 1:
Fig. 5 is 110kV transformer station typical wiring figure, below in conjunction with the mode of connection of Fig. 5, describes this programme in detail.
First electric parameters and on-off model is gathered.The signal gathered due to device is many, consider the interchange that device connects and switching value limited, therefore non-bus bar elements selects univoltage and three-phase current, and bus bar elements selects two groups of line voltage signals; And each circuit breaker needs to adopt HWJ and KKJ signal.
Table 2 information gathering table
The element gathered The analog quantity gathered Switching value
110kV inlet wire 1 and circuit breaker 111 Ua、Ia、Ib、Ic HWJ、KKJ
110kV inlet wire 2 and circuit breaker 112 Ua、Ia、Ib、Ic HWJ、KKJ
110kV mother and circuit breaker 110 Ia、Ib、Ic HWJ、KKJ
110kV bus I and circuit breaker 101 Uab、Ubc HWJ、KKJ
110kV bus II and circuit breaker 102 Uab、Ubc HWJ、KKJ
1# 35 kV Side of Main Transformer and circuit breaker 301 Ua、Ia、Ib、Ic HWJ、KKJ
2# 35 kV Side of Main Transformer and circuit breaker 302 Ua、Ia、Ib、Ic HWJ、KKJ
35kV mother and circuit breaker 300 Ia、Ib、Ic HWJ、KKJ
35kV bus I Uab、Ubc ?
35kV bus II Uab、Ubc ?
1# main transformer 10kV side and circuit breaker 501 Ua、Ia、Ib、Ic HWJ、KKJ
2# main transformer 10kV side and circuit breaker 502 Ua、Ia、Ib、Ic HWJ、KKJ
10kV mother and circuit breaker 500 Ia、Ib、Ic HWJ、KKJ
10kV bus I Uab、Ubc ?
10kV bus II Uab、Ubc ?
Element running state recognition is divided into line status identification, bus state recognition, mother state recognition.Line status is divided into four kinds: maintenance, run, can standby throw and stop transport, its for Logic judgment flow process as accompanying drawing 6; Mother state divides four kinds: run, overhaul, can standbyly throw and stop transport, its counterlogic judges that flow process is as accompanying drawing 7; Bus corresponding states divides three kinds: maintenance, operation and stoppage in transit, its counterlogic flow process is as accompanying drawing 8.
Read standby throwing function pressing plate and the standby soft control word of throwing mode, and mate with the operational mode identified, if the match is successful, enter into next step.Table 3 provides corresponding matching list.
Table 3 function pressing plate and detected state matching list
Device enters charging link, and need respectively for the prepared auto restart function selected, inlet wire recharge logic judges:
The standby throwing charge condition of high voltage side lead-in is:
" high voltage standby hauls oneself willingly into function pressing plate " is in input state;
it is the standby throwing of inlet wire that high voltage standby throws soft control word
bus connection switch is in co-bit;
two sections of buses all meet arbitrary group of line voltage > Uyy (having compression set value);
standby circuit of throwing need meet the following conditions simultaneously:
1. switch HWJ is a point position;
2. standby throwing circuit 2 voltage >Uyy (having compression set value).
3. corresponding maintenance pressing plate is in exit status;
4. corresponding KKJ opens into being 0 after closing.
In, the standby charge condition thrown of low-pressure side mother is:
" in, low pressure prepared auto restart function pressing plate " is in input state;
in, lowly standby throw soft control word and drop into
in, low mother maintenance pressing plate exit and mother (segmentation) switch in a point position, open into being 0 after corresponding KKJ conjunction;
in, low two sections of buses all meet arbitrary phase voltage > Uyy (having compression set value);
If device have selected the standby of open high, medium and low voltage three side and throws function, then all three sides are needed to meet charge condition.When condition all meets, delay through Tc, access to plant charging complete state.
After charging complete, if open anti-island protect function, then enter and sentence anti-island protect flow process.Judge that anti-island protect is judged by each side switch, concrete logical relation is as follows:
● 110kV bus sentences anti-island protect function:
During the main confession line switching tripping operation run, namely 110kV bus meets isolated island criterion; Device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch 311,312,511,512.
● 35 (10) kV I mothers sentence anti-island protect function:
Sentencing under 35 (10) kV I mother operation prerequisites, arbitrary condition meets below, and namely 35 (10) kV I mothers meet isolated island criterion, and device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch 311 (511).
1) 35 (10) kV bus connection switches divide, and #1 main transformer uprises or becomes breaker in middle tripping;
2) 35 (10) kV bus connection switches close, #1 and #2 main transformer uprises or becomes breaker in middle tripping;
3) 35 (10) kV bus connection switches close, and #1 main transformer maintenance pressing plate is thrown, and #2 main transformer uprises or becomes breaker in middle tripping;
4) 35 (10) kV bus connection switches close, and #2 main transformer maintenance pressing plate is thrown, and #1 main transformer uprises or becomes breaker in middle tripping.
● 35 (10) kV II mothers sentence anti-island protect function:
Sentencing under 35 (10) kV II mother operations in advance, arbitrary condition meets below, and namely 35 (10) kV II mothers meet isolated island criterion, and device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch 312 (512).
1) 35 (10) kV bus connection switches divide, and #2 main transformer uprises or becomes breaker in middle tripping;
2) 35 (10) kV bus connection switches close, #1 and #2 main transformer uprises or becomes breaker in middle tripping;
3) 35 (10) kV bus connection switches close, and #2 main transformer maintenance pressing plate is thrown, and #1 main transformer uprises or becomes breaker in middle tripping;
4) 35 (10) kV bus connection switches close, and #1 main transformer maintenance pressing plate is thrown, and #2 main transformer uprises or becomes breaker in middle tripping.
After anti-island protect module completes, enter prepared auto restart enable logic and judge.
When high-pressure side decompression being detected, backup auto-activating device enters high-pressure side prepared auto restart logic immediately; If the non-decompression of high-voltage side bus detected, and in only having or the female bus loss of pressure of low-pressure side, then in entering or low-voltage bus bar action logic.
Whether when high-pressure side decompression, when entering high voltage standby throwing logic, first detecting available circuit has pressure, if available circuit no-voltage, then and device electric discharge; Otherwise enter next link, the position of failure judgement point, come failure judgement region by detection inlet wire and bus connection switch fault current direction, if inlet wire fault current points to circuit, then fault occurs on the line; If inlet wire fault current points to bus, then fault occurs on bus or between inlet wire CT and bus; If non-faulty current on mother CT, then fault occurs in and connects on the main bus supplying inlet wire, otherwise then fault occurs on the bus of connection available inlet wire.The following accompanying drawing 5 of idiographic flow that high-voltage side fault differentiates.
If fault occurs in main on circuit, then only need conveniently inlet wire prepared auto restart logic, confirmation main for circuit tripping after, then the available line switching that closes; If but fault occurs between protection inlet wire CT and circuit breaker; or it is main for circuit breaker tripping; or occur on I bus in fault; then by high jump pressure bus connection switch and with I parent phase connect transformer in, low-side switch; form Fault Isolation; close available line switching afterwards again and recover II female power supply, in finally closing, low pressure bus connection switch recovers entirely to stand power supply.But note, if fault occurs on II bus, then prepared auto restart electric discharge locking.By what analyze, the reliability that the high-pressure side prepared auto restart mode after improvement makes high-voltage side bus power is improved, and entirely the stand probability of dead electricity of transformer station is greatly reduced.
The 110kV Substation Design one that the present invention is directed to containing photovoltaic access possesses the station anti-island protect in territory and prepared auto restart function integration method, gathers 110kV transformer station high, medium and low voltage side related electric amount and circuit breaker position information judges system running state in a backup auto-activating device; The prepared auto restart function of anti-island protect function and high, medium and low side can be selected whether to drop into by function pressing plate or soft control word; Before prepared auto restart logic starts, need first to carry out anti-island protect decision logic, if there is isolated island within the scope of transformer station, then need the grid-connected switch first excising photovoltaic plant; Also improve former high voltage side lead-in prepared auto restart action logic in the method, the orderly cooperation realizing the circuit breaker of high, medium and low side solves inlet wire in circuit breaker tripping, dead-zone fault situation, transformer station entirely stand have a power failure problem.
Described only have expressed one embodiment of the present invention above, it describes comparatively concrete and in detail, but and therefore can be interpreted as the restriction of the scope of the claims of the present invention.It should be noted that, to those skilled in the art, under the prerequisite not departing from this programme design, can also do some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (8)

1. the anti-island protect of substation areas of transformer station and a prepared auto restart integral method, is characterized in that, comprise the steps:
(1) whether the electric quantity information of Real-time Collection transformer station high, medium and low voltage side and switching-state information, drop in conjunction with prepared auto restart maintenance pressing plate or exit, identifying the running status that transformer station's high, medium and low voltage side element is current;
(2) according to physical cabling situation and on-the-spot operation demand, by apparatus function pressing plate, the prepared auto restart function of high, medium and low voltage side and anti-island protect is selected whether to open; By device software control word setting high, medium and low voltage side for throwing mode, and mate with the running status of the high, medium and low voltage side element identified before, if do not mated, send out alarm signal, device locking is discharged; When the standby of high, medium and low voltage side throws function and all openings of anti-island protect function, and the standby throwing mode of high, medium and low voltage side is all mated with the state of identification, then proceed to next step, otherwise, repeat step (2);
(3) detect prepared auto restart and whether meet charge condition, namely when prepared auto restart function and all openings of anti-island protect function of high, medium and low voltage side, then need three sides all to meet charge condition and just start device charging, otherwise, repeat step (3);
(4) when after prepared auto restart charging complete, if anti-island protect function pressing plate drops into, be then introduced into island protect flow process, otherwise directly enter step (5) i.e. prepared auto restart enable logic and judge flow process;
(5) enter prepared auto restart enable logic to judge, specifically first judge high-voltage side bus whether decompression, if high side bus voltage U<U min, this U minrepresent minimum amount of voltage that, then sentence bus loss of pressure, directly enter the improvement high voltage side lead-in prepared auto restart motion flow in step (6);
(6) when high-voltage side bus decompression, enter and improve high voltage side lead-in prepared auto restart logic flow, specifically first judge high voltage fault place, supply line fault if just main and can confirm that circuit breaker disconnects, then restore electricity by closing available circuit; If there is dead band or cannot confirm whether lead-in circuit breaker disconnects in fault, then by first high jump pressure bus connection switch and with in the main main transformer for the same bus of connection, low-side switch, after fault section isolation, close again extension wire switch and in, low-pressure side bus connection switch, thus recover transformer station power.
2. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method, it is characterized in that: the electric quantity information described in step (1) comprises: the univoltage of non-bus bar elements and three-phase current, two groups of line voltage signals of bus bar elements; Switching-state information comprises HWJ and the KKJ signal of circuit breaker; Element running status is divided into circuit, mother and bus three class component state, and wherein, line status is divided into four kinds: maintenance, run, can standbyly throw and stop transport; Mother state divides four kinds: run, overhaul, can standbyly throw and stop transport; Bus corresponding states divides three kinds: maintenance, operation and stoppage in transit.
3. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method; it is characterized in that: the prepared auto restart software control word in step (2) arranges the standby throwing mode for setting each side, wherein the soft control word setting principle of the standby throwing in high, medium and low voltage side is consistent.
4. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method, is characterized in that: whether the function of mating specifically input by digital examination running status described in step (2) is consistent with substation's running status.
5. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method, is characterized in that: described in step (3), charge condition specifically comprises:
1) the standby charge condition thrown of high voltage side lead-in is: " high voltage standby hauls oneself willingly into function pressing plate " is in input state; It is the standby throwing of inlet wire that high voltage standby throws soft control word; Bus connection switch is in co-bit; Two sections of buses all meet arbitrary group of line voltage > Uyy, and this Uyy representative has compression set value; Also need standby circuit of throwing to meet the following conditions: switch HWJ is point position simultaneously; Standby throwing circuit 2 voltage >Uyy, this Uyy representative has compression set value; Corresponding maintenance pressing plate is in exit status; Corresponding KKJ opens into being 0 after closing, when above condition be " with " logical relation, namely meet charge condition;
2) in, the standby charge condition thrown of low-pressure side mother is: " in, low pressure prepared auto restart function pressing plate " is in input state; In, lowly standby throw soft control word and drop into; In, low mother maintenance pressing plate exit and mother block switch in a point position, open into being 0 after corresponding KKJ conjunction; In, low two sections of buses all meet arbitrary phase voltage > Uyy, this Uyy representative has compression set value; When above condition be " with " logical relation, namely meet charge condition.
6. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method; it is characterized in that: the island protect flow process in step (4) specifically refers to and judges whether to there is isolated island by the state of cut-offfing of each side switch, and concrete logical relation is as follows:
110kV bus sentences anti-island protect function: when the main confession line switching of operation trips, namely 110kV bus meets isolated island criterion; Device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch;
35kV I, mother II sentence anti-island protect function: sentencing under 35kV I, II mother operation prerequisite, arbitrary condition meets below, and namely 35kV I, mother II meet isolated island criterion, and device action is followed according to outlet Combining soft control word excision new-energy grid-connected switch;
1) 35kV bus connection switch divides, and #1, #2 main transformer uprises or becomes breaker in middle tripping;
2) 35kV bus connection switch closes, #1 and #2 main transformer uprises or becomes breaker in middle tripping;
3) 35kV bus connection switch closes, and #1, #2 main transformer maintenance pressing plate is thrown, and #2, #1 main transformer uprises or becomes breaker in middle tripping;
4) 35kV bus connection switch closes, and #2, #1 main transformer maintenance pressing plate is thrown, and #1, #2 main transformer uprises or becomes breaker in middle tripping;
10kV I, mother II sentence anti-island protect function logic and above-mentioned 35kV I, mother II, and to sentence anti-island protect logic consistent.
7. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method: the described high-voltage side fault place in step (6) differentiates and specifically refers to by detecting inlet wire and failure judgement region is come in bus connection switch fault current direction, if inlet wire fault current points to circuit, then fault occurs on the line; If inlet wire fault current points to bus, then fault occurs on bus or between inlet wire CT and bus; If non-faulty current on mother CT, then fault occurs in and connects on the main bus supplying inlet wire, otherwise then fault occurs on the bus of connection available inlet wire.
8. the anti-island protect of a kind of substation areas of transformer station as claimed in claim 1 and prepared auto restart integral method: when the non-decompression of high-voltage side bus in step (5), and in only having, low-voltage bus bar decompression, then in entering, low voltage activate flow process.
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CN105406510A (en) * 2015-12-24 2016-03-16 无锡信大气象传感网科技有限公司 Multi-power accessed transformer substation monitoring system
CN105896491B (en) * 2016-06-02 2018-11-09 国电南瑞科技股份有限公司 A kind of multilayer wheel grade suitable for extensive new energy power station interlocks isolated island guard method
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CN106787153A (en) * 2017-02-21 2017-05-31 国网山东省电力公司莱芜供电公司 A kind of inlet wire for internal bridge form is for throwing method
CN107121951A (en) * 2017-04-24 2017-09-01 山东国电技术咨询有限公司 A kind of interlock protection function input exits monitoring system and method
CN109842202A (en) * 2017-11-28 2019-06-04 广东电网有限责任公司电力调度控制中心 A method of state correctness is moved back in monitoring backup auto-activating device output clamping throwing
CN109842202B (en) * 2017-11-28 2020-09-25 广东电网有限责任公司电力调度控制中心 Method for monitoring correctness of switching state of outlet pressing plate of automatic bus transfer device
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