CN101465560A - Method for rapidly switching power supply - Google Patents
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- CN101465560A CN101465560A CNA2008102426107A CN200810242610A CN101465560A CN 101465560 A CN101465560 A CN 101465560A CN A2008102426107 A CNA2008102426107 A CN A2008102426107A CN 200810242610 A CN200810242610 A CN 200810242610A CN 101465560 A CN101465560 A CN 101465560A
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Abstract
The invention relates to a method for fast switching over power supply; eight-circuit voltage is connected with a power supply switching-over device and comprises three-phase voltages of a bus I and a bus II, and one-circuit voltages of an incoming line I and an incoming II; four-circuit current comprises a-phase and c-phase currents of the incoming line I, and the a-phase and c-phase currents of the incoming line II; three-circuit switch position signal comprises normally-open secondary contacts of CB1, CB2 and CB3; three starting modes comprising normal switching, accident switching and abnormal switching are arranged when in switching over, and four switching-over ways comprising parallel automatic switching, parallel semi-automatic switching, series switching and simultaneous switching are arranged, and six judging conditions comprising parallel switching, rapid switching, exceeding phase-angle switching, exceeding time switching, residual voltage switching and long time delay switching are set; three interrupt source hardware mechanisms are adopted, and each interrupt source is independent; a first interrupt source is used for fixing the interrupt period, a second interrupt source is used for frequency tracing to the bus I and a third interrupt source is used for frequency tracing to the bus II.
Description
Technical field
The present invention relates to a kind of power supply fast switching method and use the device of this method, be particularly useful for the two-way switching of power plant and industrial enterprise's station service power supply.
Background technology
The continuous of power supply reliably is the primary condition of various power consumption equipment safe operations, and therefore, to the occasion one general configuration duplex feeding power supply that power supply reliability is had relatively high expectations, the successful switch between the two-way power supply is the key of continuous uninterrupted power supply.
One, the fast cutting apparatus application scenario-single busbar connection of common power
The power supply that common power supply rapid switching device is typically applied in single busbar connection switches, and the power supply that is mainly used in power plant's station service switches.By the two-way switching of table apparatus realization, thereby realize that the power supply on the single busbar connection switches fast to two switches.
General figure power supply rapid switching device typical applications is applied to the power supply switching of power plant's station service as shown in Figure 1, realizes the two-way switching to two switches.Nominal situation, bus be by " high pressure unit transformer " branch feeding, and " starting/standby change " branch is as stand-by power supply, " starting/standby change " but but also cold standby of stand-by heat.When " high pressure unit transformer " branch fault, switch CB1 tripping, bus dead electricity.Because the machinery inertial of induction-motor load, the synthetic feedback voltage on the bus will be decayed gradually, the frequency difference between itself and candidate branch power supply, differ, pressure reduction will constantly change.Common fast cutting apparatus is by following the tracks of the frequency change of bus residual voltage, accurately measure frequency, amplitude, the phase place of bus residual voltage, and then select the best of CB2 switch to close a floodgate opportunity, fast, the branch road of will powering reliably switches to " starting/standby change " branch, make the operation of not cutting off the power supply of not dead electricity of bus, institute's on-load.
Two, the fast cutting apparatus of common power application scenario-single mother partition
Along with enterprises such as iron and steel, petrochemical industry are more and more higher to the requirement of power supply, power supply rapid switching device in these applications has also more and more widely proposed requirements at the higher level to power supply rapid switching device simultaneously, needs the two-way switching of realization to three switches.Common power supply rapid switching device need adopt allocation plan shown in Figure 2 at present, disposes two fast cutting apparatus.
Common fast cutting apparatus I inserts analog quantity: the three-phase voltage of bus I, 1 road voltage of inlet wire I (phase voltage or line voltage all can), the ab line voltage of bus II, a of inlet wire I, c phase current, a of inlet wire II, c phase current; The switching value that fast cutting apparatus I inserts is: inlet wire I switch CB1 often opens auxiliary contact, and block switch CB3 often leaves auxiliary contact, and locking is fast cuts.
The analog quantity that common fast cutting apparatus II inserts and open each the amount symmetry that inserts into amount and fast cutting apparatus I.
Common fast cutting apparatus I makes the power supply branch of bus I switch between inlet wire I and bus II by control switch CB1, CB3, guarantees not dead electricity of bus I; Fast cutting apparatus II makes the power supply branch of bus II switch between inlet wire II and bus I by control switch CB2, CB3, guarantees not dead electricity of bus II; When the logical fast cutting apparatus action of a Daepori, output action contact to the locking of the common fast cutting apparatus of offside open into, the other Daepori of locking leads to fast cutting apparatus.
This allocation plan cost is higher, and wiring is complicated, and the logical fast cutting apparatus of every Daepori all needs to insert 5 road voltages, 4 road magnitudes of current, 2 way switch position signallings, 1 road interlocking signal.
According to the function of at present common power supply rapid switching device, for the application scenario of single mother partition, need two fast cutting apparatus guarantee the standby each other of two sections buses, one side cost height like this, wiring complexity on the other hand.Therefore The field proposes higher requirement to power supply rapid switching device, requires the separate unit power supply rapid switching device can realize that the two-way handoff functionality to three switches, the power supply branch that finishes two sections buses switch.
Summary of the invention
The object of the invention provides a kind of power supply fast switching method that can be applicable to single mother partition mode of connection, can realize the two-way function of cutting soon of 3 way switch by the separate unit power transfer device, and the power supply branch that finishes two sections buses switches.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The power supply fast switching method, power transfer device is inserting 8 road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II; 4 road magnitudes of current: a of inlet wire I, c phase current, a of inlet wire II, c phase current; 3 way switch position signalling: CB1, CB2, CB3 often open auxiliary contact, when switching, be provided with normal switching, accident switching, three kinds of Starting mode of undesired switching, and be provided with automatics switchover in parallel, semi-automatic switching in parallel, series connection is switched and switch four kinds of switching modes simultaneously, and have in parallelly switch, switch fast, angle of phase lead switches, the preceding more time switches, residual voltage is switched and six kinds of decision conditions of long delay switching; It is characterized in that: adopt three interrupt source hardware mechanisms, each interrupt source is independent separately; First interrupt source is interrupt cycle fixedly, the frequency-tracking that second interrupt source is carried out bus I, and the 3rd interrupt source is carried out frequency-tracking to bus II.In the application scenario of single mother partition, a playscript with stage directions invention power supply rapid switching device can be simultaneously and the frequency change of two sections busbar voltages of uncorrelated tracking, realizes the two-way switching to 3 way switch under accident and normal condition:
Data sampling of the present invention separates with data processing and carries out: the interrupt service routine of second interrupt source and the 3rd interrupt source is used to finish sampling operation, and sampled data is deposited in the data buffer zone respectively; The interrupt service routine of first interrupt source adopts the all-wave fourier algorithm to calculate to sampled data, calculates two bus frequencies and amplitude.
Each cycle of the interrupt service routine of first interrupt source of the present invention calculates bus I voltage or bus II electric voltage frequency changing value, when the frequency change value of bus I voltage or bus II voltage during, upgrade one time second or the 3rd interrupt source interrupt cycle greater than default frequency difference threshold value 0.01～0.03Hz.
Preceding more time switching condition of the present invention calculates according to a leading time of sending out the order of closing a floodgate and estimates switching angle, when estimating switching angle (θ) and be zero in the formula (1), sending the order of closing a floodgate:
The intrinsic closing time formula of the outlet time+switch of the fast cutting apparatus of Δ t=(1)
Wherein: Δ t is for sending out the order leading time that closes a floodgate; θ is for estimating switching angle; θ
0Be target supply voltage and bus residual voltage any time phase angle difference; Δ ω is the angular velocity difference between bus residual voltage and target power supply; (Δ ω) ' be the rate of change of angular velocity difference.
Half-wave zero crossing in the formula (2) θ constantly
0Calculated by following method: at first calculate the zero crossing moment t1 (as shown in Figure 4) of target supply voltage respectively according to formula (3), bus residual voltage zero crossing is t2 constantly; Then according to t1, t2 and weekly the ripple sampling number calculate t1 to the sampling number of t2 in the time period; Last is that benchmark calculates the phase angle difference θ between t2 moment bus residual voltage and target power supply with the target supply voltage again
0:
Wherein: tm is the curve zero crossing moment; t
iWith t
I+1Be respectively two sampled points moment that close on zero crossing tm; X
iWith X
I+1Be respectively t
iWith t
I+1Sample amplitude when reproduced amplitude constantly; t
iWith t
I+1Between the time interval be a sampling period Ts.
The non-zero crossing of in the formula (2) other is phase angle difference θ constantly
0Be the θ that has calculated 6 ~ 10 adjacent half-wave zero crossings by employing formula (3)
0, adopt least square curve fitting to obtain.
Beneficial effect of the present invention: a power supply rapid switching device can be finished task of needing two Daepori energize apparatus for fast switching just can finish originally, enlarged the application of power supply rapid switching device, simplified peripheral wiring, reduce cost, and can reduce the impact to loading in the handoff procedure.
Description of drawings
For the invention will be further described, provide accompanying drawing:
Fig. 1 uses allocation plan for the typical case of common power apparatus for fast switching
Fig. 2 is the application allocation plan of common power apparatus for fast switching in single mother partition occasion
Fig. 3 is the application allocation plan of the invention process case in single mother partition occasion
Fig. 4 zero crossing is t constantly
mCalculating chart
Embodiment
Describe specific implementation method of the present invention in detail below in conjunction with accompanying drawing.
The present invention adopts three interrupt source modes, can realize two periods buses whiles and uncorrelated tracking by a fast cutting apparatus, not only can be applied to the described occasion of Fig. 1, and can be applied to the described occasion of Fig. 2, finish the handoff functionality of the logical fast cutting apparatus of above-mentioned two Daeporis.Dispose by mode shown in Figure 3, the present invention only need insert 8 road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II.4 road magnitudes of current: a of inlet wire I, c phase current, a of inlet wire II, c phase current; 3 way switch position signalling: CB1, CB2, CB3 often open auxiliary contact.
1, the present invention has normal switching, accident switching, three kinds of Starting mode of undesired switching:
1) the normal switching is meant that the power supply that carries out under the nominal situation switches.Manually boot switching by device screen menu or console switch or ECS/DCS system, the present invention discerns switching direction automatically, finishes the two-way switching between switch CB1 and CB3, switch CB2 and CB3.
2) the accident switching is meant the switching that causes owing to the inlet wire fault.With the protective device on inlet wire I, inlet wire II outlet contact insert " inlet wire 1 protection starts " of the present invention open into, " inlet wire 2 protections start " open into, start by the protective device outlet and to switch, realize the switching of switch CB1 to CB3, switch CB2 to CB3.
3) undesired switching is the switching that is caused by the non-fault low pressure of bus.Comprise two kinds of situations: a. bus I or bus II three-phase voltage continue low pressure; B,, misoperation, switching mechanism failure and other reasons jump because of causing service entrance switch CB1 or CB2 mistake.Under the above-mentioned situation, the present invention starts switching automatically, realizes the switching of switch CB1 to CB3, switch CB2 to CB3.
2, the present invention has four kinds of switching modes and six switching determination conditions, provides complete handoff functionality in conjunction with above-mentioned three kinds of Starting mode.
Power supply rapid switching device handoff functionality abridged table
Switch to bus II with the power supply branch of bus I by inlet wire I and illustrate each switching mode:
1) automatic switching mode in parallel: manual starting is switched, and when switching condition in parallel satisfies, closes the CB3 switch, and " shunt tripping time-delay " definite value is satisfied in time-delay, and after confirming to close a floodgate successfully, automatic tripping CB1 switch.
2) semi-automatic switching mode in parallel: manual starting is switched, when switching condition in parallel satisfies, and the CB3 switch that closes, the operation of tripping CB1 switch is manually finished.If CB1 switch tripping not yet in the certain hour, device alarm locking;
3) series connection switching mode: manual starting is switched, and sends and jumps the CB1 switch command, and when treating that tripping of CB1 switch and switching condition satisfy, the CB3 switch closes.Switching condition comprises: switching fast, angle of phase lead switch, the preceding more time switches, residual voltage is switched, long delay switches.
4) switching mode simultaneously: manual starting is switched, and sends and jumps the CB1 switch command, and after definite value " was switched the time-delay of closing a floodgate " simultaneously, no matter whether tripping of CB1 switch was sent out when switching condition satisfies and closed the CB3 switch command.Switching condition comprises: switching fast, angle of phase lead switch, the preceding more time switches, residual voltage is switched, long delay switches.
Switch to bus II with the power supply branch of bus I by inlet wire I and illustrate six kinds of switching determination conditions:
1) switching condition in parallel: bus I is with frequency difference, the pressure reduction of bus II, when differing less than " switching frequency difference in parallel ", " pressure reduction that switches in parallel ", " the in parallel switching differs " definite value, and switching condition in parallel satisfies;
2) quick switching condition: fast cutting apparatus start switch after, if the frequency difference of current bus I and bus II, differ less than less than " cutting frequency difference soon ", " fast cut is poor " definite value the time, switching condition is satisfied fast;
3) angle of phase lead switching condition: after fast cutting apparatus starts switching, in continuous two service routines of interrupt source 1, bus I and bus II differ leap " with catching angle of phase lead " definite value, and the frequency difference of bus I and bus II is during less than " allowing frequency difference with catching " definite value, and the angle of phase lead switching condition satisfies;
4) preceding more time switching condition: after fast cutting apparatus starts switching, in interrupt source 1 according to angular difference pace of change and the rate of change thereof of current bus I and bus II, according to " with catch the preceding more time " definite value, it is zero combined floodgate point that the feedback voltage of estimating bus I differed with the first time of bus II voltage.To differ be zero if estimate, and the frequency difference of bus I and bus II is during less than " allowing frequency difference with catching " definite value, and preceding more time switching condition is satisfied;
5) residual voltage switching condition: fast cutting apparatus start switch after, when bus I voltage during all less than " residual voltage switching amplitude " definite value, the residual voltage switching condition satisfies;
6) long delay switching condition: after fast cutting apparatus starts switching, in the time-delay that " long delay time " definite value is set, if above-mentioned each switching condition does not all satisfy, it is satisfied that then time-delay finishes back long delay switching condition, and this switching condition is as total reserve of above-mentioned switching condition;
3, in the handoff procedure in order to realize that two-way bus (bus I and bus II) simultaneously and uncorrelated frequency-tracking, and guarantee correct logical operation, functions such as record ripple, communication, hardware platform of the present invention adopts three independently interrupt sources, is respectively timer1, timer2 and timer3.
L) timer1 adopts fixing interrupt cycle, and 0.833ms starts once, functions such as completion logic computing, record ripple, communication; Timer2 is used to finish the frequency-tracking sampling of bus I; Timer3 is used to finish the frequency-tracking sampling of bus II.
2) the interruption execution cycle of timer2, timer3 is upgraded according to the frequency change size of bus I, II by timer1, and the fastest each cycle upgrades once.After timer2, the timer3 interrupt response, its interrupt routine is only carried out sampling operation, and timer2 gathers the three-phase voltage of bus I, and timer3 gathers the three-phase voltage of bus II, and sampled data deposits two in independently in the data buffer zone.Because timer1, timer2, timer3 are independent separately, the break in service cycle may be inconsistent, when therefore timer1 interrupts arriving, data number pending in two individual buffer districts also may be inconsistent, so provide the position mark of pending data in buffering area by two global variables among the timer2, timer3 interrupt service routine.The timer1 interrupt service routine adopts all-wave fourier algorithm calculated rate and amplitude to the busbar voltage sampled value of preserving in two data buffering areas, and upgrades according to the intensity of variation of bus frequency the interrupt cycle of timer2, timer3.Each cycle calculates the intensity of variation of a frequency, when busbar voltage frequency change during greater than default frequency difference threshold, the interrupt cycle of upgrading a timer2 (or timer3), so both can guarantee the rapidity of following the tracks of, and can prevent that again tracking from shaking.
4, for the mode of connection of single mother partition, the present invention has four kinds of switching directions: CB1 switches to CB3, and CB3 switches to CB1, and CB2 switches to CB3, and CB3 switches to CB2.Therefore, the interrupt service routine of timer1 need be discerned switching direction automatically according to the position of the switch and failure condition, and the comparison other when automatically selecting to switch, calculate differ, frequency difference, pressure reduction.For example: when normally moving, CB1, CB2 closes a floodgate, and CB3 is in gate-dividing state, when inlet wire I fault, protective device tripping CB1 switch, bus I dead electricity, according to displacement of the CB1 position of the switch and bus I electric voltage dropping, the present invention starts.The present invention selects bus I as tracing object automatically, calculates differing between bus II and bus I, frequency difference, pressure reduction in real time, selects best combined floodgate opportunity, closes block switch CB3, makes bus I charged by bus II, guarantees the operation of not cutting off the power supply of bus I institute on-load.
5, consider the fixedly closing time of switch, preceding more time switching condition calculates according to a leading time of sending out the order of closing a floodgate and estimates switching angle, when estimating switching angle (θ) and be zero in the formula (2), sending the order of closing a floodgate, the impact minimum of back to load of guaranteeing to close a floodgate.Computing formula is:
The intrinsic closing time formula of the outlet time+switch of the fast cutting apparatus of Δ t=(1)
Wherein: Δ t is for sending out the leading time of the order of closing a floodgate; θ is for estimating switching angle; θ
0Be target supply voltage and bus residual voltage phase angle difference at a time; Δ ω is the angular velocity difference between bus residual voltage and target power supply; (Δ ω) ' be the rate of change of angular velocity difference.
6, the θ in the formula of preceding more time switching condition (2)
0Calculating adopt following method: the zero crossing that calculates the target supply voltage respectively according to formula (3) t1 (as shown in Figure 4) constantly at first, bus residual voltage zero crossing is t2 constantly; Then according to t1, t2 and weekly the ripple sampling number calculate t1 to the sampling number of t2 in the time period; Last is that benchmark calculates the phase angle difference θ between t2 moment bus residual voltage and target power supply with the target supply voltage again
0
The curve zero passage moment, tm was the curve zero crossing moment as shown in Figure 4; t
iWith t
I+1For closing on the sampled point moment of zero crossing tm; X
iWith X
I+1Be respectively t
iWith t
I+1The voltage magnitude of moment sampled point, t
iWith t
I+1Between the time interval be a sampling period Ts.X
iWith X
I+1Between sine curve can use fitting a straight line, calculate according to formula (3) and can get zero crossing t constantly
m:
Other non-zero crossing moment phase angle difference θ in the formula (2)
0Be to adopt the θ that has calculated 6 ~ 10 adjacent half-wave zero crossings by (formula 3)
0, adopt least square curve fitting to obtain.So just can obtain the θ of any time
0
Claims (6)
1, power supply fast switching method, power transfer device is inserting 8 road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II; 4 road magnitudes of current: a of inlet wire I, c phase current, a of inlet wire II, c phase current; 3 way switch position signalling: CB1, CB2, CB3 often open auxiliary contact; When switching, be provided with normal switching, accident switching, three kinds of Starting mode of undesired switching, and be provided with automatics switchover in parallel, semi-automatic switching in parallel, series connection is switched and switch four kinds of switching modes simultaneously, and have in parallelly switch, switch fast, angle of phase lead switches, the preceding more time switches, residual voltage is switched and six kinds of decision conditions of long delay switching; It is characterized in that: adopt three interrupt source hardware mechanisms, each interrupt source is independent separately; First interrupt source is interrupt cycle fixedly, the frequency-tracking that second interrupt source is carried out bus I, and the 3rd interrupt source is carried out frequency-tracking to bus II.
2, by the described a kind of power supply fast switching method of claim 1, it is characterized in that: data sampling separates with data processing and carries out: the interrupt service routine of second interrupt source and the 3rd interrupt source is used to finish sampling operation, and sampled data is deposited in the data buffer zone respectively; The interrupt service routine of first interrupt source adopts the all-wave fourier algorithm to calculate to sampled data, calculates two bus frequencies and amplitude.
3, by the described a kind of power supply fast switching method of claim 2, it is characterized in that: each cycle of the interrupt service routine of first interrupt source calculates bus I voltage or bus II electric voltage frequency changing value, when the frequency change value of bus I voltage or bus II voltage during, upgrade one time second or the 3rd interrupt source interrupt cycle greater than default frequency difference threshold value 0.01～0.03Hz.
4, by the described a kind of power supply fast switch over method of claim 1, it is characterized in that, preceding more time switching condition calculates according to the leading time of sending out the order of closing a floodgate and estimates switching angle, when estimating switching angle θ and be zero in the formula (2), sending the order of closing a floodgate: the intrinsic closing time formula of the outlet time+switch of the fast cutting apparatus of Δ t=(1)
Wherein: Δ t is for sending out the leading time of the order of closing a floodgate; θ is for estimating switching angle; θ
0Be target supply voltage and bus residual voltage any time phase angle difference; Δ ω is the angular velocity difference between bus residual voltage and target power supply; (Δ ω) is the rate of change of angular velocity difference.
5,, it is characterized in that the half-wave zero crossing θ constantly in the formula (2) by the described a kind of power supply fast switch over method of claim 4
0Calculated by following method: at first calculate the zero crossing moment t1 of target supply voltage respectively according to formula (3), bus residual voltage zero crossing is t2 constantly; Then according to t1, t2 and weekly the ripple sampling number calculate t1 to the sampling number of t2 in the time period; Last is that benchmark calculates the phase angle difference θ between t2 moment bus residual voltage and target power supply with the target supply voltage again
0:
Formula (3)
Wherein: tm is the curve zero crossing moment; t
iWith t
I+1For closing on two sampled points moment of zero crossing tm; X
iWith X
I+1Be respectively t
iWith t
I+1Sample amplitude when reproduced amplitude constantly; t
iWith t
I+1Between the time interval be a sampling period Ts.
6,, it is characterized in that other the non-zero crossing moment phase angle difference θ in the formula (2) by claim 1 and the described a kind of power supply fast switch over method of claim 4
0Be the θ that has calculated 6 ~ 10 adjacent half-wave zero crossings by the method that adopts claim 5
0, adopt least square curve fitting to obtain.
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| CN107634576A (en) * | 2017-08-30 | 2018-01-26 | 常熟市五爱电器设备有限公司 | Middle pressure automatic change-over switch equipment |
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| CN110932382A (en) * | 2019-11-29 | 2020-03-27 | 中国海洋石油集团有限公司 | Method suitable for fast switching of power supply |
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| CN106160185A (en) * | 2015-03-25 | 2016-11-23 | 南京理工大学 | A kind of method using fast switching device to carry out power supply switching |
| CN106253450A (en) * | 2016-08-29 | 2016-12-21 | 江苏大唐国际吕四港发电有限责任公司 | A kind of power-supply system for thermal power plant's auxiliary control system |
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| CN107947340A (en) * | 2017-10-30 | 2018-04-20 | 国网山西省电力公司晋城供电公司 | A kind of quick power switching system and its switching method |
| CN107947340B (en) * | 2017-10-30 | 2022-05-10 | 国网山西省电力公司晋城供电公司 | Power supply fast switching system and switching method thereof |
| CN110460047A (en) * | 2019-08-15 | 2019-11-15 | 中广核研究院有限公司 | The power-supply switching method and system of AC system are pressed in a kind of atomic-powered ship |
| CN110571916A (en) * | 2019-09-29 | 2019-12-13 | 北京潞电电气设备有限公司 | 0.4kV double-power switching device and switch |
| CN110932382A (en) * | 2019-11-29 | 2020-03-27 | 中国海洋石油集团有限公司 | Method suitable for fast switching of power supply |
| CN112787650A (en) * | 2020-12-30 | 2021-05-11 | 国网河北省电力有限公司 | Method and device for rapidly judging three-phase position of isolating switch |
| CN114563753A (en) * | 2021-04-12 | 2022-05-31 | 正泰集团研发中心(上海)有限公司 | Power failure detection method, device and equipment for electric energy meter and computer readable storage medium |
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| CN114050641A (en) * | 2021-11-22 | 2022-02-15 | 江苏金智科技股份有限公司 | Rapid switching-on method of power supply rapid switching-off device based on healthy and complete phases |
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