CN104917171A - Intelligent distributed self-healing control method based on fault at 0.4kV side in distribution substation - Google Patents
Intelligent distributed self-healing control method based on fault at 0.4kV side in distribution substation Download PDFInfo
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- CN104917171A CN104917171A CN201510221877.8A CN201510221877A CN104917171A CN 104917171 A CN104917171 A CN 104917171A CN 201510221877 A CN201510221877 A CN 201510221877A CN 104917171 A CN104917171 A CN 104917171A
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Abstract
The invention relates to an intelligent distributed self-healing control method based on a fault at a 0.4kV side in a distribution substation. The method is characterized by comprising the following steps: fault type judgment is carried out when power failure of a bus is detected, and when the fault is a low-voltage bus fault, the self-healing function is locked, and the fault is handled manually; when the fault is a low-voltage outgoing line protection refusal fault, an outgoing line switch is switched off, and a main switch is reclosed; when the fault is a low-voltage line fault, the main switch is reclosed; and when the fault is another fault, a bus coupler carries out self-healing. Automatic fault location, fault isolation, recovery of power supply to non-fault regions, and other functions at the 0.4kV side in a distribution substation are achieved, blind areas in 0.4 kV equipment monitoring are eliminated, the reliability of power supply is further improved, the level of integrated operation of distribution automation is improved in an overall manner, the equipment utilization rate is improved, power loss is reduced, and the electricity selling loss is lowered for power supply enterprises.
Description
Technical field
The invention belongs to intelligent substation technical field, especially a kind of intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station.
Background technology
Universal along with intelligent grid concept and technology, the intelligent level of transformer station requires to be subject to increasing in industry attention.Along with the spread of Distribution Automation Technology in recent years, the intelligent level of transformer station also progressively developed to low-voltage-grade.0.4kV is as electric pressure final in transformer station, and the intellectuality of this electric pressure will effectively ensure equipment reliability of operation and economy.
No matter be 0.4kV side self-healing control or economical operation, it is all by operating the bus connection switch between bus after one section of bus has a power failure at all.At present, in 0.4kV side, during unrealized intellectuality, transformer station needs on duty by manually carrying out, and the operation of bus connection switch will strictly observe operating provision and operating sequence.At present, although some product can carry out automatic operation to bus connection switch, be still isolated single product, do not form overall electrical power distribution automatization system.Along with electrical power distribution automatization system is to the increase in demand of low-voltage, realizing based on 0.4kV side self-healing control and economical operation in power distribution station is the inevitable requirement in this field.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station is provided, solves the problem of 0.4kV side self-healing control in intellectual power distributing station.
The present invention solves its technical problem and takes following technical scheme to realize:
Based on an intelligent distributed self-healing control method for 0.4kV side fault in power distribution station, comprise the following steps:
Step 1, detect bus have a power failure time, enter fault type judge, when fault type is low-voltage bus bar fault, then locking self-healing function is by manpower intervention handling failure;
Step 2, when fault type is low-pressure line-outgoing relay fail fault, then carry out the process of outlet switch separating brake and by the process of master switch reclosing;
Step 3, when fault type is low-voltage circuit fault, then carry out by the process of master switch reclosing;
Step 4, when fault type is other faults, carry out mother self-healing process.
And the method that described fault type judges comprises the following steps:
(1) trip protection signal is there by master switch? be enter step (2), otherwise judge that transformer end opening is to by total whether no-voltage suitable for reading? be then transformer fault;
(2) do you judge to be in open position by master switch auxiliary contact? enter step (3), otherwise for being subject to master switch relay fail fault;
(3) do you judge to occur that switch has trip protection signal? be enter step (4), otherwise be busbar fault;
(4) do you judge that switch auxiliary contact is in open position? be then low pressure near-end line fault, otherwise for there is switch protection tripping state.
And the process of described terminal separating brake comprises the following steps:
(1) sub-gate signal is sent to outlet switch;
(2) judge whether be in closing position by master switch auxiliary contact, be enter step (3), otherwise carry out reclosing block, manpower intervention process;
(3) terminal separating brake success.
And, describedly to comprise the following steps by the process of master switch reclosing:
(1) do you judge there is voltage by always suitable for reading? be enter step (2), otherwise carry out reclosing block, manpower intervention process;
(2) switching signal is sent to by master switch;
(3) judge whether be in closing position by master switch auxiliary contact, be enter step (4), otherwise carry out reclosing block, manpower intervention process;
(4) do you judge there is voltage by total end opening? be then by the success of master switch reclosing, otherwise carry out reclosing block, manpower intervention process.
And described bus self-healing process comprises the following steps:
(1) sub-gate signal is sent to by master switch, judge to be in open position by master switch auxiliary contact? be enter step (2), otherwise carry out self-healing locking, manpower intervention process;
(2) judge whether low-voltage load exceeds transformer maximum bearing ability, i.e. I
l1+ I
l2<1.2I
tNenter step (3), otherwise cut-out load enter step (3);
(3) sub-gate signal is sent to bus connection switch;
(4) judge whether bus connection switch auxiliary contact is in open position, is, enter step (5), otherwise carry out self-healing locking, manpower intervention process;
(5) do you judge there is voltage by total end opening? be then mother self-healing success, otherwise carry out self-healing locking, manpower intervention process;
In above formula, I
l1: represent No. 1 low-voltage bus bar operating current, I
l2: represent No. 2 low-voltage bus bar operating currents, I
tN: the smaller value representing No. 1 transformer and No. 2 specified running currents of transformer.
Advantage of the present invention and good effect are:
The present invention is by the intelligent distributed self-healing control to 0.4kV side fault in power distribution station, realize fault automatic location, fault type judgement, fault self-recovery, community for the function such as electricity consumption operation conditions and electric energy quality real-time monitoring, eliminate 0.4kV electric pressure monitoring of tools blind area, overall raising power distribution automation comprehensive operation level, lifting means utilance, under the prerequisite not reducing customer power supply reliability, reduce line loss, reduce power supply enterprise's operating cost.
Accompanying drawing explanation
fig. 1for the electrical connection signal in intelligent substation
figure;
fig. 2for logic control of the present invention is total
figure;
fig. 3for breakdown judge logic flow
figure;
fig. 4for bus self-healing action logic
figure;
fig. 5for being subject to master switch reclosing action logic
figure;
fig. 6for terminal separating brake action logic
figure.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described:
Based on an intelligent distributed self-healing control method for 0.4kV side fault in power distribution station, be realize based on the Intelligent Substation System shown in Fig. 1.In figure, T
1: represent No. 1 transformer, T
2: represent No. 2 transformers, L
1: No. 1 0.4kV bus, L
2: No. 2 0.4kV buses, K
t1: the 10kV outlet switch representing No. 1 transformer, K
t2: the 10kV outlet switch representing No. 2 transformers, K
z1: represent that the 0.4kV of No. 1 transformer is by master switch, K
z2: represent that the 0.4kV of No. 2 transformers is by master switch, K
m1-2: represent the bar coupler between No. 1 low-voltage bus bar and No. 2 low-voltage bus bars, U
tL1: represent that No. 1 transformer end opening is to being subject to voltage always suitable for reading, U
tL2: represent that No. 2 transformer end openings are to being subject to voltage always suitable for reading, U
z1: represent the voltage of No. 1 transformer by total end opening, U
z2: represent the voltage of No. 2 transformers by total end opening, I
l1: represent No. 1 low-voltage bus bar operating current, I
l2: represent No. 2 low-voltage bus bar operating currents, I
tN: the smaller value representing No. 1 transformer and No. 2 specified running currents of transformer.
The present invention for the requirement of the ancillary equipment in system and device is: transformer 0.4kV possesses four remote control function and communication interface by master switch, outlet switch; Transformer has enough idle capacities; Low-voltage equipment possesses certain idle capacity; Possesses 0.4kV distribution management terminal in station.
The present invention is by carrying out digitlization, information reform to 0.4kV distribution management terminal, can complete 0.4kV network-based control and process, realize the remote viewing function of the remote signalling of 0.4kV controller switching equipment, remote measurement, remote control and remote regulating (adjustment setting value) and important website.0.4kV distribution management terminal possesses informationization and four remote control function, obtains the ruuning situation of 0.4kV network, can process in time when power distribution network occurs abnormal.When higher level 10kV network or transformer break down cause part 0.4kV network dead electricity time, can distant control function be passed through, carry out the adjustment of 0.4kV network, recover customer power supply in time, reach high voltage network support function.When not yet reaching design capacity for energize portions network load, distribution transformer operation ratio is very low, is not in transformer economic operation interval.Now, by the monitoring to 0.4kV network, carry out network and simply adjust, exit a station power distribution transformer, lifting means utilance, under the prerequisite not reducing customer power supply reliability, reduce line loss, reduce power supply enterprise's operating cost.By making the overall arrangement for intelligent switch and automatically-monitored equipment to 0.4kV electric pressure equipment, building senior electrical power distribution automatization system, realizing fault automatic location, fault self-recovery, community for the function such as electricity consumption operation conditions and electric energy quality real-time monitoring.
The present invention realizes in 0.4kV distribution management terminal, can with other Program Coordination priority, also can leave on the spot or distant place blocking order routine interface in import department, carry out manual program locking.The present invention is based on following principle to carry out:
Self-healing Starting mode judgment principle
| U Z1 | U Z2 | 0.4kV running status | Explanation |
| 1 | 1 | Normal operating condition | Economical operation state can be entered after verification running current |
| 0 | 1 | Malfunction | Enter L 1Self-healing logic |
| 1 | 0 | Malfunction | Enter L 2Self-healing logic |
| 0 | 0 | Malfunction | Self-healing function does not start |
U
z1=1: represent No. 1 0.4kV bus (L
1) there is voltage
U
z1=0: represent No. 1 0.4kV bus (L
1) no-voltage
U
z2=1: represent No. 2 0.4kV bus (L
2) there is voltage
U
z2=0: represent No. 2 0.4kV bus (L
2) no-voltage
Start constraints: the open self-healing function of main website, local open self-healing function.
Locking constraints: main website locking self-healing function, this locality exit self-healing function, the self-inspection of low tension switch release is reported to the police.
Based on an intelligent distributed self-healing control method for 0.4kV side fault in power distribution station, as shown in Figure 2 and Figure 3, comprise the following steps:
When step 1, bus have a power failure, carry out fault type judgement, determine whether low-voltage bus bar fault? if then carry out low-voltage bus bar troubleshooting (self-healing locking, manpower intervention).
Low-voltage bus bar troubleshooting: fault point is positioned on the cabinet bus by total end opening; can cause by master switch trip protection; low-voltage bus bar is caused to have a power failure; but each outlet switch is all without trip signal; this fault cannot use self-healing function in station, needs maintainer to reach the spot and carries out rushing to repair (self-healing locking, manpower intervention).
Step 2, determine whether low-pressure line-outgoing relay fail fault? if then carry out low-pressure line-outgoing relay fail troubleshooting (process of terminal separating brake, by total reclosing process).
When low-voltage circuit outlet fault, there is relay fail due to device self reason in outlet switch, causes and cause low-voltage bus bar decompression by master switch tripping operation.By terminal, separating brake instruction is issued to breakdown switch in this situation, carry out sub-switching operation by the motor-operating mechanism of switch, start by gross weight closing function after separating brake success, realize fault self-recovery.
Step 3, determine whether low-voltage circuit fault? if then carry out low-voltage circuit troubleshooting (by total reclosing process).
Low-voltage circuit troubleshooting: this fault current is in normal protection range; cause this loop outlet switch trip protection, this kind of normal startup of situation protection isolates line fault, starts by gross weight closing function; realize fault self-recovery, do not need self-healing function in initiating station.
Step 4, other faults (transformer fault, low pressure near-end line fault), then carry out mother self-healing process.
Judging it is not low-voltage circuit fault through step 3, is then other faults, comprises transformer fault or low pressure near-end line fault.
Transformer fault: fault point is positioned at by always suitable for reading, by total end opening fault-free point, self-healing function in initiating station.
Low pressure near-end line fault: fault point is positioned at the very near position of distance outlet switch; fault current is larger; cause this circuit outlet switch and affiliated by master switch almost simultaneously trip protection, cause low-voltage bus bar to have a power failure, this fault is by carrying out self-healing by gross weight closing function.
The present invention, when carrying out fault type and judging, carries out based on following principle:
Breakdown judge logical table
| By master switch | Outlet switch | Fault type |
| 1 | 1 | Normal operating condition |
| 1 | 0 | Pressure common line fault |
| 0 | 1 | Low-voltage bus bar fault |
| 0 | 0 | Near-end low-voltage circuit fault |
Definition: " 0 " represents switch separating brake; " 1 " represents that switch closes a floodgate
Switch motion decision logic table:
Release guard signal: " 1 " represents that release sends trip protection signal, " 0 " represents that release does not send trip protection signal.
Position of the switch auxiliary contact: " 1 " represents position of the switch auxiliary contact indicator cock co-bit, " 0 " represents that position of the switch auxiliary contact indicator cock divides position.
| Release guard signal | Position of the switch auxiliary contact | Switch motion |
| 1 | 1 | Switch success separating brake |
| 1 | 0 | Switch protection tripping |
| 0 | 1 | Switch protection malfunction |
| 0 | 0 | There is not any action in switch, normally closes a floodgate |
Fault type judges to adopt decision logic as shown in Figure 4, specifically comprises following judgement flow process:
(1) trip protection signal is there by master switch? enter step (2), otherwise judge U
tL=0? be then transformer fault, otherwise self-healing locking, manpower intervention.
U
tL=0 refers to that No. 1 transformer end opening is 0 to by voltage always suitable for reading and No. 2 transformer end openings to by voltage always suitable for reading;
(2) do you judge to be in open position by master switch auxiliary contact? enter step (3), otherwise for being subject to master switch relay fail fault;
(3) do you judge to occur that switch has trip protection signal? be enter step (4), otherwise be busbar fault;
(4) do you judge that switch auxiliary contact is in open position? be then low pressure near-end line fault, otherwise for there is switch protection tripping state.
Bus self-healing process of the present invention as shown in Figure 5, comprises following processing logic:
(1) sub-gate signal is sent to by master switch, judge to be in open position by master switch auxiliary contact? be enter step (2), otherwise carry out self-healing locking, manpower intervention process.
(2) judge whether low-voltage load exceeds transformer maximum bearing ability, i.e. I
l1+ I
l2<1.2I
tNenter step (3), otherwise cut-out load enter step (3).
(3) sub-gate signal is sent to bus connection switch.
(4) judge whether bus connection switch auxiliary contact is in open position, is, enter step (5), otherwise carry out self-healing locking, manpower intervention process.
(5) do you judge there is voltage by total end opening? be then mother self-healing success, otherwise carry out self-healing locking, manpower intervention process.
Of the present invention by the process of master switch reclosing as shown in Figure 6, comprise following processing logic:
(1) do you judge there is voltage by always suitable for reading? be enter step (2), otherwise carry out reclosing block, manpower intervention process.
(2) switching signal is sent to by master switch.
(3) judge whether be in closing position by master switch auxiliary contact, be enter step (4), otherwise carry out reclosing block, manpower intervention process.
(4) do you judge there is voltage by total end opening? be then by the success of master switch reclosing, otherwise carry out reclosing block, manpower intervention process.
Terminal separating brake start treatment of the present invention
as Fig. 6shown in, comprise following processing logic:
(1) sub-gate signal is sent to outlet switch.
(2) judge whether be in closing position by master switch auxiliary contact, be enter step (3), otherwise carry out reclosing block, manpower intervention process.
(3) terminal separating brake success.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other execution modes drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (5)
1., based on an intelligent distributed self-healing control method for 0.4kV side fault in power distribution station, it is characterized in that comprising the following steps:
Step 1, detect bus have a power failure time, enter fault type judge, when fault type is low-voltage bus bar fault, then locking self-healing function is by manpower intervention handling failure;
Step 2, when fault type is low-pressure line-outgoing relay fail fault, then carry out the process of outlet switch separating brake and by the process of master switch reclosing;
Step 3, when fault type is low-voltage circuit fault, then carry out by the process of master switch reclosing;
Step 4, when fault type is other faults, carry out mother self-healing process.
2. the intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station according to claim 1, is characterized in that: the method that described fault type judges comprises the following steps:
(1) trip protection signal is there by master switch? be enter step (2), otherwise judge that transformer end opening is to by total whether no-voltage suitable for reading? be then transformer fault;
(2) do you judge to be in open position by master switch auxiliary contact? enter step (3), otherwise for being subject to master switch relay fail fault;
(3) do you judge to occur that switch has trip protection signal? be enter step (4), otherwise be busbar fault;
(4) do you judge that switch auxiliary contact is in open position? be then low pressure near-end line fault, otherwise for there is switch protection tripping state.
3. the intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station according to claim 1, is characterized in that: the process of described terminal separating brake comprises the following steps:
(1) sub-gate signal is sent to outlet switch;
(2) judge whether be in closing position by master switch auxiliary contact, be enter step (3), otherwise carry out reclosing block, manpower intervention process;
(3) terminal separating brake success.
4. the intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station according to claim 1, is characterized in that: describedly comprise the following steps by the process of master switch reclosing:
(1) do you judge there is voltage by always suitable for reading? be enter step (2), otherwise carry out reclosing block, manpower intervention process;
(2) switching signal is sent to by master switch;
(3) judge whether be in closing position by master switch auxiliary contact, be enter step (4), otherwise carry out reclosing block, manpower intervention process;
(4) do you judge there is voltage by total end opening? be then by the success of master switch reclosing, otherwise carry out reclosing block, manpower intervention process.
5. the intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station according to claim 1, is characterized in that: described bus self-healing process comprises the following steps:
(1) sub-gate signal is sent to by master switch, judge to be in open position by master switch auxiliary contact? be enter step (2), otherwise carry out self-healing locking, manpower intervention process;
(2) judge whether low-voltage load exceeds transformer maximum bearing ability, i.e. I
l1+ I
l2<1.2I
tNenter step (3), otherwise cut-out load enter step (3);
(3) sub-gate signal is sent to bus connection switch;
(4) judge whether bus connection switch auxiliary contact is in open position, is, enter step (5), otherwise carry out self-healing locking, manpower intervention process;
(5) do you judge there is voltage by total end opening? be then mother self-healing success, otherwise carry out self-healing locking, manpower intervention process;
In above formula, I
l1: represent No. 1 low-voltage bus bar operating current, I
l2: represent No. 2 low-voltage bus bar operating currents, I
tN: the smaller value representing No. 1 transformer and No. 2 specified running currents of transformer.
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|---|---|---|---|
| CN201510221877.8A CN104917171B (en) | 2015-05-04 | 2015-05-04 | Intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station |
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|---|---|---|---|
| CN201510221877.8A CN104917171B (en) | 2015-05-04 | 2015-05-04 | Intelligent distributed self-healing control method based on 0.4kV side fault in power distribution station |
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| CN104917171B CN104917171B (en) | 2017-03-01 |
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| CN104917171B (en) | 2017-03-01 |
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Granted publication date: 20170301 Termination date: 20180504 |