CN104092281A - Alternating-current dual-power switching method - Google Patents
Alternating-current dual-power switching method Download PDFInfo
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- CN104092281A CN104092281A CN201410292764.2A CN201410292764A CN104092281A CN 104092281 A CN104092281 A CN 104092281A CN 201410292764 A CN201410292764 A CN 201410292764A CN 104092281 A CN104092281 A CN 104092281A
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Abstract
The invention relates to an alternating-current dual-power switching method, and belongs to the technical field of direct-current transmission. Two three-phase power detection elements KVM 1 and KVM 2 are arranged on an alternating-current dual-power bus, and the states of the alternating-current power detection elements KVM 1 and KVM 2 on the bus and the state of a power detection element KV 1 or KV 2 on one path of alternating-current power inlet wire in an input state are detected; if the states of any two elements in the three elements are 1, it is considered that the bus is electrified, and the input of the current path of inlet wire power is kept. If the states of any two elements in the three elements are 0, the other path of inlet wire power is switched to. The method carries out switching control in the mode with alternating-current bus voltage detection as the primary thing and inlet wire voltage detection as the secondary thing, the two-out-of-three principle is adopted in a logic control element, and the maloperation, caused by faults of individual elements, of a switching device is effectively avoided.
Description
Technical field
The present invention relates to a kind of interchange duplicate supply changing method, belong to HVDC Transmission Technology field.
Background technology
The advantages such as high voltage direct current transmission (HVDC) has extra long distance and large capacity transmission, cost is low, loss is little, find broad application in China and other country at present.Converter valve is the nucleus equipment of direct current transportation, and high-pressure high-power thyristor is the nucleus equipment parts of converter valve, bearing the transmission of rectification (sending end), inversion (receiving end) high-power power, converter valve at electric energy transmitting simultaneously, self also can produce larger power loss, caloric value is large, needs reliable cooling device to carry out cooling, so that converter valve and DC transmission system can stable operations.As the converter valve the most effective cooling type of cooling, converter valve water-cooling system is along with direct current transportation project is also used widely.
The nucleus equipment of converter valve water-cooling system all adopts ac power supply as main circulation pump, cooling blower, spray pump etc., and the stable of AC power has very important significance to whole water-cooling system.Therefore the main flow of power-supply system designs, and extensively adopts the powering mode of double-circuit communication power supply, and terminal adopts ATS device (double-power supply switching device).Mainly contain at present following several mode:
1. the ATS of the circuit breaker switching mode of liang platform independent
The ATS of this kind of mode makes switching device by the circuit breaker of two platform independent band motor-operating mechanisms; with automatic controller, circuit breaker, pass through corresponding socket; mounting bases etc. are installed together; due to circuit breaker, have the defencive functions such as overload, short circuit, overvoltage/undervoltage and phase shortage, therefore can hold concurrently protection and handoff functionality are in one.Between two circuit breakers, be provided with machinery and the malfunction of electrical interlock mode, as shown in Figure 1.
This circuit is used peripheral cell few, and simple structure is cheap.
The problem existing: motor-operating mechanism can not frequent operation, and operate time is long.In actual motion, occurred that, due to motor-operating mechanism clamping stagnation, two-way AC power all can not drop into, and caused AC system to have a power failure.Therefore reliability is relatively low.
2. the ATS of electromechanical integration automatic change-over switching mode
The ATS device of this kind of electromechanical integration conversion regime integrates switch, driving mechanism and controller, has " I – 0-II " three position of the switch, crosses zero-bit while guaranteeing conversion.Between two-way AC power, be provided with machinery, electrical interlock, as shown in Figure 2.
This device is owing to adopting integrated design, and overall dimensions is less, has abundant manual adjustments function simultaneously, substantially can meet the application of most of occasion.The problem existing: this device adopts integrated design, when equipment fault, AC system needs to have a power failure, can not on-bne repair and replacing, cannot meet and there is the more electric power system of high reliability request.As high-voltage dc transmission electrical domain converter valve cooling system.
Above-mentioned ATS device all be take and is detected incoming power as according to carrying out the switching of power supply.When major loop switch contact not closed, detecting element fault or while causing ac bus decompression due to other reason, switching device shifter cannot be made corresponding response, thereby causes unnecessary power outage.
Summary of the invention
The object of this invention is to provide a kind of interchange duplicate supply changing method, take and solve current detection incoming power as the problem according to carrying out the unnecessary power outage that switching is caused of power supply.
The present invention provides a kind of interchange duplicate supply changing method for solving the problems of the technologies described above, and this changing method comprises the following steps:
1) on the bus that exchanges duplicate supply, 23 phase power supply detecting element KVM1 and KVM2 are set, 13 phase power supply detecting element KV1 and KV2 are respectively set on two-way AC power inlet wire;
2) the AC power detecting element KVM1 on detection bus and the state of KVM2, and in dropping into state Yi road AC power inlet wire power source checks element status;
3) the AC power detecting element KVM1 on judgement bus and KVM2 and the state in input state Yi road AC power inlet wire power source detecting element;
4) if it is that above-mentioned 3 elements have any two element states, think that bus is charged at 1 o'clock, keep the input of current road incoming power;
5) if it is that above-mentioned 3 elements have any two element states, switch to another road incoming power at 0 o'clock.
Described step 5) if in AC power detecting element KVM1, KVM2 on bus and in the AC power inlet wire power source detecting element of non-input state Yi road any two element states be 0 o'clock, if the power supply checks element status of road AC power inlet wire becomes at 1 o'clock, the inlet wire AC power on the extremely original Na Yi of switchback road from 0 before.
The method also comprises the self check to AC power inlet wire power source detecting element, and this process of self-test is as follows:
Make AC power inlet wire to be detected in input state, detect the state of ac bus power supply detecting element KVM1, KVM2 and AC power inlet wire detecting element, when ac bus power supply detecting element KVM1 and KVM2 state are 1, and checks element status on AC power inlet wire to be detected is 0, illustrate that the detecting element on the AC power inlet wire on this road breaks down.
The method also comprises the self check to ac bus power supply detecting element, and this process of self-test is as follows:
Shi Yi road AC power inlet wire is in input state, detect the state of this road AC power inlet wire power source detecting element, and under the state that is 1 at this power supply detecting element, detect the state of ac bus power supply detecting element KVM1 and KVM2, judge whether ac bus power supply checks element status is 0, and the ac bus power supply detecting element that state is 0 breaks down.
The invention has the beneficial effects as follows: the present invention, by 23 phase power supply detecting element KVM1 and KVM2 being set on the bus exchanging duplicate supply, detects AC power detecting element KVM1 and KVM2 and the state in input state Yi road AC power inlet wire power source detecting element KV1 or KV2 on bus; If it is 1 o'clock that above-mentioned 3 elements have any two element states, think that bus is charged, keep the input of current road incoming power; If it is that above-mentioned 3 elements have any two element states, switch to another road incoming power at 0 o'clock.The present invention be take detection ac bus voltage as main, and primary voltage is that auxiliary mode is carried out switching controls, and logic control element adopts three to get two principles, effectively avoids causing switching device shifter malfunction because of indivedual element faults.
Accompanying drawing explanation
Fig. 1 is the ATS schematic diagram of two platform independent circuit breaker switching modes in prior art;
Fig. 2 is the ATS schematic diagram of electromechanical integration automatic change-over switching mode;
Fig. 3 is converter valve water-cooling control system configuration sketch in the embodiment of the present invention;
Fig. 4 is that the present invention exchanges double-power supply switching device power-supply system figure;
Fig. 5 is that the present invention exchanges double-power supply switching device control circuit figure;
Fig. 6 is the power supply 1 interchange duplicate supply switch logic block diagram during for main power source;
Fig. 7 is the power supply 2 interchange duplicate supply switch logic block diagram during for main power source;
Fig. 8 is the interchange duplicate supply switch logic block diagram of KM1 while being input state;
Fig. 9 is the interchange duplicate supply switch logic block diagram of KM2 while being input state;
Figure 10 be KM1 while being input state AC power carry out 1 power supply detecting element self check logic diagram;
Figure 11 be KM2 while being input state AC power carry out 2 power supply detecting element self check logic diagram;
Figure 12 is ac bus power supply detecting element self check logic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
The duplicate supply that the present embodiment be take in direct-current transmission converter valve water-cooling system describes as example.Direct-current transmission converter valve water-cooling control system is due to the importance of its equipment, PLC control system, and I/O module and powersupply system all adopt dual design, to improve the reliability of water-cooling system, as shown in Figure 3.The CPU of converter valve water-cooling control system adopts high-performance S7-400H series, and while normally moving, a CPU is main, and another is in hot stand-by duty.Two CPU configuration synchronization templates connect by optical cable, realize the hardware redundancy of CPU.S7-400H adopts the active redundancy(-ce) principle of hot standby mode, while breaking down, can carry out undisturbed and automatically switch.During fault-free, two I/O modules are all in running status, if broken down, and the control of the whole process of subelement energy complete independently of normal work.The present invention be take the hardware and software platform of above-mentioned high redundancy as support, invents a kind of interchange duplicate supply changing method, and the implementation procedure of the method is as follows:
1. on the bus that exchanges duplicate supply, 23 phase power supply detecting element KVM1 and KVM2 are set, 13 phase power supply detecting element KV1 and KV2 are respectively set on two-way AC power inlet wire.
As shown in Figure 4, two-way AC power is connected to ac bus after service entrance switch, contactor, isolating switch, electric, software interlocking that contactor adopts, and synchronization only has a contactor to put into operation.13 phase power supply detecting element KV1, KV2 are respectively set on two-way incoming power, 23 phase power supply detecting element KVM1, KVM2 are set on bus.That all detecting elements all have is under-voltage, phase sequence, degree of unbalance, default-phase protection function.
Two-way AC power by different control Power supplies, and configures independent control switch through inlet wire contactor, as shown in Figure 5.During normal operation, A is in off-state for manual knob switch S, by converter valve water-cooling control system, drives KA1, KA2 or KB1, KB2 relay to select the throwing of A.C. contactor KM1 or KM2 to move back.Wherein KA1, KA2 are from converter valve water-cooling control system A, and KB1, KB2 are from converter valve water-cooling control system B.
2. detect AC power detecting element KVM1 on bus and the state of KVM2, and in dropping into state Yi road AC power inlet wire power source detecting element KV1 or KV2 state.
The state information of the service entrance switch of two-way AC power, contactor, power supply detecting element, and the state information of ac bus power supply detecting element are delivered to I/O modules A, the I/O module B of converter valve water-cooling control system simultaneously.
3. according to the state information of the service entrance switch of two-way AC power, contactor, power supply detecting element, and the state information of ac bus power supply detecting element is carried out logic control.
1) switch logic of two contactors of initial condition
As shown in Figure 6, meet when AC power inlet wire 1 switch closes, AC power inlet wire 1 power supply normal, power supply 1 is set is main power source simultaneously, preferentially drop into AC power inlet wire 1 contactor KM1.When condition does not meet, drop into AC power inlet wire 2 contactors.When power supply 2 is set for main power source, as shown in Figure 7, switch logic and upper identical, no longer repeat specification.
2) switch logic after AC power contactor input
AC power inlet wire 1 contactor KM1, when dropping into state, as shown in Figure 8, when AC power detecting element KVM1, these 3 elements of KVM2, KV1 have any two element states to be 1, thinks that bus is charged, now keeps the input of current contactor KM1; When AC power detecting element KVM1, these 3 elements of KVM2, KV1 have any two element states to be 0, switch to another road contactor KM2.If AC power monitoring element KVM1, any two element states of KVM2, KV2 are 0, and the power supply detecting element KV1 state of AC power inlet wire 1 becomes at 1 o'clock from 0, and switchback is to contactor KM1.
AC power inlet wire 2 contactor KM2 are when dropping into state, as shown in Figure 9, when ac bus power supply detecting element KVM1, these 3 elements of KVM2, KV2 have any two element states to be 1, think that bus is charged, now keep the input of current contactor KM2; When ac bus power supply detecting element KVM1, these 3 elements of KVM2, KV2 have any two element states to be 0, switch to another road contactor KM1.If AC power monitoring element KVM1, any two element states of KVM2, KV1 are 0, and the power supply detecting element KV2 state of AC power inlet wire 2 becomes at 1 o'clock from 0, and switchback is to contactor KM2.
Above-mentioned criterion adopts three to get two principles, avoids indivedual element faults and causes erroneous judgement, thereby greatly reduced the probability of the malfunction of AC power.
For a long time in charging operation state, as ageing equipment, there is the risk of fault in power supply detecting element KV1, KV2, KVM1, KVM2.And said elements state participates in electrical source exchange logic, so the present invention is in order to monitor its operating state, and to change in time, the present invention also comprises AC power detecting element is carried out to process of self-test, and self check logic is as follows:
AC power inlet wire 1 detecting element self check logic:
When AC power inlet wire 1 contactor KM1 is when dropping into state, as shown in figure 10, and ac bus power supply detecting element KVM1, both states of KVM2 are 1, detect the state of AC power inlet wire detecting element KV1, if AC power inlet wire detecting element KV1 state is 0 o'clock, illustrate that this detecting element is abnormal, need to change.
AC power inlet wire 2 detecting element self check logics:
When AC power inlet wire 2 contactor KM2 are when dropping into state, as shown in figure 11, and ac bus power supply detecting element KVM1, both states of KVM2 are 1, detect the state of AC power inlet wire detecting element KV2, if AC power inlet wire detecting element KV2 state is 0 o'clock, illustrate that this detecting element is abnormal, need to change.
Ac bus power supply detecting element self check logic:
When AC power inlet wire 1 contactor KM1 is when input state and AC power inlet wire detecting element KV1 are 1, as shown in figure 12, if ac bus power supply detecting element KVM1, both states of KVM2 any be 0, illustrate that this element is abnormal.When AC power inlet wire 2 contactor KM2 are when input state and AC power inlet wire detecting element KV1 are 1, any is 0 for ac bus power supply detecting element KVM1, both states of KVM2, reports this element abnormal.
The present invention abandons to adopt in the past take primary voltage detecting element as main, carry out the way of electrical source exchange, it is main changing detecting ac bus voltage into, and primary voltage is auxiliary mode, logic control element adopts three to get two principles, effectively avoids causing switching device shifter malfunction because of indivedual element faults.Can carry out self check to alternating voltage detecting element, find in time fault element and can change online simultaneously.
Claims (4)
1. exchange a duplicate supply changing method, it is characterized in that, this changing method comprises the following steps:
1) on the bus that exchanges duplicate supply, 23 phase power supply detecting element KVM1 and KVM2 are set, 13 phase power supply detecting element KV1 and KV2 are respectively set on two-way AC power inlet wire;
2) the AC power detecting element KVM1 on detection bus and the state of KVM2, and in dropping into state Yi road AC power inlet wire power source checks element status;
3) the AC power detecting element KVM1 on judgement bus and KVM2 and the state in input state Yi road AC power inlet wire power source detecting element;
4) if it is that above-mentioned 3 elements have any two element states, think that bus is charged at 1 o'clock, keep the input of current road incoming power;
5) if it is that above-mentioned 3 elements have any two element states, switch to another road incoming power at 0 o'clock.
2. interchange duplicate supply changing method according to claim 1, it is characterized in that, described step 5) if in AC power detecting element KVM1, KVM2 on bus and in the AC power inlet wire power source detecting element of non-input state Yi road any two element states be 0 o'clock, if the power supply checks element status of road AC power inlet wire becomes at 1 o'clock, the inlet wire AC power on the extremely original Na Yi of switchback road from 0 before.
3. interchange duplicate supply changing method according to claim 2, is characterized in that, the method also comprises the self check to AC power inlet wire power source detecting element, and this process of self-test is as follows:
Make AC power inlet wire to be detected in input state, detect the state of ac bus power supply detecting element KVM1, KVM2 and AC power inlet wire detecting element, when ac bus power supply detecting element KVM1 and KVM2 state are 1, and checks element status on AC power inlet wire to be detected is 0, illustrate that the detecting element on the AC power inlet wire on this road breaks down.
4. interchange duplicate supply changing method according to claim 2, is characterized in that, the method also comprises the self check to ac bus power supply detecting element, and this process of self-test is as follows:
Shi Yi road AC power inlet wire is in input state, detect the state of this road AC power inlet wire power source detecting element, and under the state that is 1 at this power supply detecting element, detect the state of ac bus power supply detecting element KVM1 and KVM2, judge whether ac bus power supply checks element status is 0, and the ac bus power supply detecting element that state is 0 breaks down.
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| CN201410292764.2A CN104092281B (en) | 2014-06-25 | 2014-06-25 | A kind of exchange dual power supply switching method |
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| CN201410292764.2A CN104092281B (en) | 2014-06-25 | 2014-06-25 | A kind of exchange dual power supply switching method |
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| CN104092281B CN104092281B (en) | 2018-07-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107845519A (en) * | 2017-12-04 | 2018-03-27 | 常熟开关制造有限公司(原常熟开关厂） | Double power supply automatic transfer switch and its control method |
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| CN202363969U (en) * | 2011-12-16 | 2012-08-01 | 乐山一拉得电网自动化有限公司 | Novel complete equipment for automatically switching backup power supply |
| CN203326702U (en) * | 2013-06-17 | 2013-12-04 | 武汉南华工业设备工程股份有限公司 | Dual power supply switching device |
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Patent Citations (6)
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| WO2008138911A1 (en) * | 2007-05-14 | 2008-11-20 | Abb Technology Ag | Redundant current valve control in a high voltage power transmission system |
| CN201178330Y (en) * | 2008-04-09 | 2009-01-07 | 沈毅 | Self-detecting self-maintaining system apparatus for multiple work circuit failure |
| US20110260538A1 (en) * | 2010-04-13 | 2011-10-27 | Huang Jli-Kun | High reliability dual power sources automatic switch circuit and isolation apparatus of the same |
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| CN107845519A (en) * | 2017-12-04 | 2018-03-27 | 常熟开关制造有限公司(原常熟开关厂） | Double power supply automatic transfer switch and its control method |
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| CN104092281B (en) | 2018-07-17 |
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Address after: 461000 Xuchang City, Henan Province Economic and Technological Development Zone high-tech XJ Electric City Road Patentee after: Henan Jingrui Cooling Technology Co., Ltd Address before: 461000 Xuchang City, Henan Province Economic and Technological Development Zone high-tech XJ Electric City Road Patentee before: XUCHANG XUJI JINGRUI TECHNOLOGY Co.,Ltd. |