CN103344879A - Electrical capacity measuring method for quick power source switching apparatus - Google Patents
Electrical capacity measuring method for quick power source switching apparatus Download PDFInfo
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- CN103344879A CN103344879A CN2013101889988A CN201310188998A CN103344879A CN 103344879 A CN103344879 A CN 103344879A CN 2013101889988 A CN2013101889988 A CN 2013101889988A CN 201310188998 A CN201310188998 A CN 201310188998A CN 103344879 A CN103344879 A CN 103344879A
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Abstract
Disclosed in the invention is an electrical capacity measuring method for a quick power source switching apparatus. The power source switching apparatus is connected with eight paths of voltages including respective three-phase voltages of a bus I and a bus II, one path of voltage of an incoming line, and one path of voltage of incoming line II, six paths of current magnitudes including a-phase, a-phase, c-phase currents of the incoming line I as well as a-phase, b-phase, and c-phase currents of the incoming line II, and three paths of switching device signals including signals of normally-closed auxiliary contacts of a 1DL, a 2DL, and a 3DL. On the basis of hardware filtering and utilization of a conditioning circuit, the eight paths of sine-wave voltages are structured into square waves; and the square waves are connected to a CPLD to carry out eight-path frequency measurement; and rising edges and falling edges of the square waves carry out frequency measurement, so that a one-time frequency value can be updated at half of cycle. According to the invention, the provided electrical capacity measuring method is mainly suitable for power supply switching of industrial enterprises of petrifaction, metallurgy and coal and the like; frequencies of a bus voltage and an incoming line voltage can be measured precisely; real-time sampling and tracking are realized; and accuracy of measuring of an electrical capacity needed by power supply switching can be ensured.
Description
Technical field
The present invention relates to a kind of measuring method, particularly a kind of electrical quantities measurement method that is applicable to power supply rapid switching device.
Background technology
The mesohigh electric substation of large and medium-sized industrial enterprise such as petrochemical industry, metallurgy, coal for guaranteeing continuous industrial processes, guarantees the important load reforwarding row that constantly is electrically connected, and a general configuration duplex feeding power supply adopts the mode of connection (shown in accompanying drawing l) of single mother partition.When the external electrical network fault, when causing improper power failure or short supply interruption, by power supply rapid switching device standby power supply is dropped into, guarantee the reliable continuously of power supply.
Electric parameters such as the frequency of power supply rapid switching device by measuring the bus residual voltage, phase place, amplitude select the best of Backup Power Switch to close a floodgate opportunity, finish between power supply fast, reliably and switch.Therefore, accurately measuring of frequency, phase place, amplitude is the quick handover success of power supply whether key.
At present, each is cut producer soon quick switching of the power supply of industrial enterprise has been cooked in detail effectively research, can finish between power supply preferably and switch.But still there are some problems aspect the degree of accuracy of electrical quantities measurement:
1. device only has a sampling to calculate, and only follows the tracks of the variation of bus I electric voltage frequency.The measurement that is bus I, bus II, inlet wire I, inlet wire II voltage is calculated, and all carries out the AD sample conversion according to bus I electric voltage frequency.When inlet wire II supply frequency takes place unusual or inlet wire II when losing power supply and causing bus II residual voltage frequency to descend, can cause bus II, inlet wire II electrical quantities measurement inaccurate.
2. device arranges two sampling interruptions, follows the tracks of the variation of bus I, II electric voltage frequency.This scheme can realize the switching of switch 1DL to 3DL, switch 2DL to 3DL, but the switching mode for 3DL to 1DL, 3DL to 2DL, 1DL to 2DL, 2DL to 1DL, still there is defective in this scheme, can not correctly follow the tracks of the variation of inlet wire I, II electric voltage frequency, cause electrical quantities measurement inaccurate.
3. when measuring the bus frequency, only measure the frequency of a certain phase of bus, as this section bus frequency.When fault is exactly this frequency measurement phase time mutually just, can cause can not frequency measurement or frequency measurement inaccurate.
4. adopt the software frequency measurement.According to the AD sampled point, adopt the all-wave fourier algorithm to calculate the bus frequency, upgrade the interrupt cycle of AD sampling then according to the variation of bus frequency.Like this, the measurement of frequency depends on accurate AD sampling, and the degree of accuracy of AD sampling depends on accurate sample frequency tracking, and both influence each other, and cause frequency measurement inaccurate.
Summary of the invention
The objective of the invention is, propose a kind of electrical quantities measurement method that is applicable to power supply rapid switching device, be fit to all methods of operation of industrial enterprise's power supply, and provide frequency measurement accurately and corresponding electrical quantities measurement for power supply switches.
The technical scheme that addresses the above problem is:
A kind of electrical quantities measurement method that is applicable to power supply rapid switching device, power transfer device inserts eight road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II; Six road magnitudes of current: a of inlet wire I, b, c phase current, a of inlet wire II, b, c phase current; The normally closed auxiliary contact of three-way switch position signalling: lDL, 2DL, 3DL; By hardware filtering, modulate circuit, with eight road sine voltages regular be square wave, and insert CPLD and carry out eight drive tests frequently; Square wave rising edge, the equal frequency measurement of negative edge make that half cycle is a renewable frequency values;
Carry out phase angle measurement by measuring phase angle difference: between described eight road voltages angular difference equal to rise on the way along or negative edge Counter Value and another road rising edge or negative edge counter value poor, the up-to-date square-wave cycle that gets divided by another drive test then.
The invention has the advantages that the inventive method is applied to power supply to be switched fast, be enhanced in the frequency computation part precision that the frequency measurement error is less than 0.01Hz.Simultaneously three tunnel technology of frequency trackings and non-fault mutually automatic identification technology also improved the precision that electric parameters was calculated when power supply switched, for the judgement of combined floodgate condition provides reliable data, improve the power supply success rate for switching, reduced the impact that the power supply handoff procedure causes.Frequency measuring method clear physics conception of the present invention is clear and definite; The automatic adaptive system structural change of the present invention or changes of operating modes are namely with the method for operation of system, the structure-irrelevant of electrical network; The present invention still can accurately record frequency and the phase angle of busbar voltage under the situation of power fail; The inventive method is simple, clear and definite, accurate, can be applied in the power supply rapid switching device easily.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the wiring schematic diagram of apparatus for fast switching under single denominator partition running mode;
Fig. 2 is converted to the square-wave signal circuit for sine wave signal;
Fig. 3 is phase angle difference instrumentation plan between sampling channel.
Embodiment
In order to deepen the understanding of the present invention, the invention will be further described below in conjunction with embodiment and accompanying drawing, and this embodiment only is used for explaining the present invention, does not constitute the restriction to protection domain of the present invention.
Shown in Fig. 1-3, the invention provides a kind of electrical quantities measurement method that is applicable to power supply rapid switching device, power transfer device inserts eight road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II; Six road magnitudes of current: a of inlet wire I, b, c phase current, a of inlet wire II, b, c phase current; The normally closed auxiliary contact of three-way switch position signalling: lDL, 2DL, 3DL; By hardware filtering, modulate circuit, with eight road sine voltages regular be square wave, and insert CPLD and carry out eight drive tests frequently; Square wave rising edge, the equal frequency measurement of negative edge make that half cycle is a renewable frequency values;
Carry out phase angle measurement by measuring phase angle difference: between described eight road voltages angular difference equal to rise on the way along or negative edge Counter Value and another road rising edge or negative edge counter value poor, the up-to-date square-wave cycle that gets divided by another drive test then.
The present invention is achieved by the following technical solutions:
The present invention inserts eight road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II.Eight road voltages are converted to 0～10V small-signal through the device voltage transformer (VT), and this signal part enters the AD chip and samples, and another part is square-wave signal through circuit conversion shown in Figure 2.Eight road square-wave signals are sent into eight passages of CPLD respectively and are carried out frequency measurement.If the CPLD count frequency is 25MHz for the frequency(count frequency).When the square wave rising edge arrives, trigger CPLD and interrupt, and record current count value counter_up1, when the square wave negative edge arrived, record current count value counter_down1 was when the next rising edge of square wave arrives, record current count value counter_up2, frequency at this moment
f1＝frequency/(counter_up2-counter_up1)，
When the next negative edge of square wave arrives, record current count value counter_down2, frequency at this moment
f2＝frequency/(counter_down2-counter_down1)，
Every half cycle, CPLD will upgrade current frequency values like this.
For the measurement of phase angle, if adopt fourier algorithm, because three AD synchronized sampling fully, phase angle measurement also has than mistake, presses 50Hz and calculates every poor 1ms of sampling time, have 18 ° of errors, therefore also need to utilize differential seat angle between CPLD count value measuring and calculating phasor.Fig. 3 is phase angle difference instrumentation plan between sampling channel.The algorithm of angle measurement difference foundation is: angular difference equals this passage rising edge (or negative edge) Counter Value and other passage rising edge (or negative edge) counter value is poor between the passage, then the up-to-date square-wave cycle that records divided by other passage.Concrete computing formula is: establish passage 1 rising edge and be cnt15 in chronological order, cnt13, cnt11, negative edge are cnt14, cnt12.Passage 2 rising edges are cnt25 in chronological order, cnt23, and cnt21, negative edge are cnt24, cnt22.When the rising edge (or negative edge) of passage 1 or passage 2 arrives, measuring and calculating interchannel angular difference.In the T5 moment, passage 2 rising edges trigger, and passage 1 with respect to the angular difference of passage 2 is
360°×(cnt23-cnt13)/(cnt13-cnt15)。
In the T4 moment, passage 1 negative edge triggers, and passage 1 with respect to the angular difference of passage 2 is
360°×(cnt12-cnt24)/(cnt23-cnt25)。
In the T3 moment, passage 2 rising edges trigger, and passage 1 with respect to the angular difference of passage 2 is
360°×(cnt22-cnt12)/(cnt12-cnt14)。
By that analogy.
As Fig. 1, the present invention controls lDL, 2DL, three switches of 3DL, so the same period, point had three.Adopt three AD, software is provided with three samplings accordingly and interrupt is used for three AD samplings and frequency-tracking, adjusts the sampling period in real time according to bus I frequency for first, guarantees that a cycle can adopt 24 points, is used for all-wave Fu Shi calculating; Second according to bus II frequency, adjusts the sampling period in real time; The 3rd AD selects inlet wire I or inlet wire II frequency to follow the tracks of according to the position of the switch, when 1DL is in the branch position, the same period, point was between inlet wire I and the bus, select trackings of sampling of inlet wire I electric voltage frequency, when 2DL is in the branch position, the tracking of sampling of selection inlet wire II electric voltage frequency, when 3DL is in the branch position, because the same period, point was between bus I and the bus II, the accuracy that inlet wire I, inlet wire II calculate does not influence switching, can unify to be undertaken by inlet wire I frequency.Data such as the voltage phase angle that the interruption of sampling separately calculates, amplitude are deposited in the data buffer respectively.Since the judgement of the maintenance of system clock millisecond and logic with handle the interruption that needs a fixed cycle, therefore device arranges a 1ms and regularly interrupts, and is used for the data judgment processing that calculates, execution power supply switch logic are interrupted in three samplings.
When system broke down, device selected non-fault phase frequency as the bus frequency automatically.Namely select the frequency of amplitude maximal phase in the three-phase voltage as the bus frequency.Under the system voltage normal condition, in order to prevent three-phase voltage when fluctuation, non-fault is met and is switched back and forth between three-phase, therefore, has only certain phase voltage amplitude for maximum and during greater than the non-fault phase voltage selected 1.2 times of last time, just upgrading this is non-fault phase mutually.
To sum up, the present invention has improved the accuracy of the electric parameters of power supply rapid switching device, thereby has improved the accuracy that power supply rapid switching device switches.The present invention is enhanced in the frequency computation part precision, and the frequency measurement error is less than 0.01Hz.Simultaneously three tunnel technology of frequency trackings and non-fault mutually automatic identification technology also improved the precision that electric parameters was calculated when power supply switched, for the judgement of combined floodgate condition provides reliable data, improve the power supply success rate for switching, reduced the impact that the power supply handoff procedure causes.Frequency measuring method clear physics conception of the present invention is clear and definite; The automatic adaptive system structural change of the present invention or changes of operating modes are namely with the method for operation of system, the structure-irrelevant of electrical network; The present invention still can accurately record frequency and the phase angle of busbar voltage under the situation of power fail; The inventive method is simple, clear and definite, accurate, can be applied in the power supply rapid switching device easily.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. electrical quantities measurement method that is applicable to power supply rapid switching device, it is characterized in that: power transfer device inserts eight road voltages: i.e. bus I, each three-phase voltage of bus II, each one road voltage of inlet wire I, inlet wire II; Six road magnitudes of current: a of inlet wire I, b, c phase current, a of inlet wire II, b, c phase current; The normally closed auxiliary contact of three-way switch position signalling: lDL, 2DL, 3DL; By hardware filtering, modulate circuit, with eight road sine voltages regular be square wave, and insert CPLD and carry out eight drive tests frequently; Square wave rising edge, the equal frequency measurement of negative edge make that half cycle is a renewable frequency values;
Carry out phase angle measurement by measuring phase angle difference: between described eight road voltages angular difference equal to rise on the way along or negative edge Counter Value and another road rising edge or negative edge counter value poor, the up-to-date square-wave cycle that gets divided by another drive test then.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116481599A (en) * | 2023-06-25 | 2023-07-25 | 珠海矽敏科技有限公司 | Multichannel signal acquisition device and sensor system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6359794B1 (en) * | 1999-12-01 | 2002-03-19 | Acme Electric Corporation | Battery backup power supply |
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
| CN101917058A (en) * | 2010-08-26 | 2010-12-15 | 深圳市国立智能电力科技有限公司 | Method and system for switching backup power supply |
| CN102324781A (en) * | 2011-09-08 | 2012-01-18 | 天津理工大学 | Novel power supply quick switching control system and switching method thereof |
| WO2012072526A2 (en) * | 2010-11-30 | 2012-06-07 | Siemens Aktiengesellschaft | Method and system for fast switching backup power supply in multiple power source |
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2013
- 2013-05-20 CN CN201310188998.8A patent/CN103344879B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6359794B1 (en) * | 1999-12-01 | 2002-03-19 | Acme Electric Corporation | Battery backup power supply |
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
| CN101917058A (en) * | 2010-08-26 | 2010-12-15 | 深圳市国立智能电力科技有限公司 | Method and system for switching backup power supply |
| WO2012072526A2 (en) * | 2010-11-30 | 2012-06-07 | Siemens Aktiengesellschaft | Method and system for fast switching backup power supply in multiple power source |
| CN102324781A (en) * | 2011-09-08 | 2012-01-18 | 天津理工大学 | Novel power supply quick switching control system and switching method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116481599A (en) * | 2023-06-25 | 2023-07-25 | 珠海矽敏科技有限公司 | Multichannel signal acquisition device and sensor system |
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