CN201541129U - Low-voltage reactive compensation switching device - Google Patents
Low-voltage reactive compensation switching device Download PDFInfo
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- CN201541129U CN201541129U CN200920182616XU CN200920182616U CN201541129U CN 201541129 U CN201541129 U CN 201541129U CN 200920182616X U CN200920182616X U CN 200920182616XU CN 200920182616 U CN200920182616 U CN 200920182616U CN 201541129 U CN201541129 U CN 201541129U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model relates to an electric control device in the field of power supply and distribution, in particular to a low-voltage reactive compensation switching device. The low-voltage reactive compensation switching device comprises a control system and a plurality of low-voltage reactive compensation modules. The structural points thereof are as follows: the low-voltage reactive compensation modules are an integrated part; the control system consists of a power supply circuit, a display and key circuit, a special electrical measurement chip, a sampling circuit and a single chip microcomputer; and the power supply circuit supplies power to other electrical parts of the control system. The low-voltage reactive compensation switching device has the advantages of: having convenient wiring and compact structure to be convenient to stripping-out a compensation capacitor for switching test, a mode of stepped switching and reactive quantity as switching threshold values is adopted to carry out precise compensation reactively on a user system, and reasonably set step multiples, and the number of all bulk capacitors can take minimum switching stepped value and lead all small bulk capacitors not to be used repeatedly and frequently; and the control system adopts special electrical measurement chip and the single chip microcomputer to play own roles so as to optimize and simplify the software and hardware of the circuit.
Description
Technical field:
The utility model relates to a kind of for the electrical control gear in the distribution field, particularly relates to a kind of low-voltage reactive power compensation switching device.
Background technology:
As everyone knows, because the 0.4KV low-pressure reactive compensation has important function to power grid security, high-quality, economical operation, so reactive power compensation is the problem that power department and user pay much attention to always.The use of reactive power compensation technology for the voltage stability of effective raising system, guarantees the quality of voltage of electrical network, improves the utilance of sending out transmission facility, reduces idle network loss and reduce the generating expense to have crucial meaning.
0.4KV the low voltage electric network reactive power compensation technology has experienced years of development, using more at present, product mainly contains following shortcoming: 1, version: a kind of structure is to adopt discrete devices such as common idle compensating control, fuse (or air switch), special-purpose A.C. contactor (or combination switch), thermal relay, power capacitor, be installed in the low-tension switch cabinet respectively or the cabinet face, connect with lead respectively again.This mode complex structure, function singleness, wiring is loaded down with trivial details, the failure rate height; Another kind is a modular construction, but owing to the reason on the Design of Mechanical Structure makes this product to test under the situation that breaks away from building-out capacitor, be unfavorable for adopting the exfactory inspection of the capacitor box of this product assembling, often can only after the capacitor box scene installs and moves, just can pinpoint the problems.2, control technology: the capacity building-out capacitor such as be primarily aimed at for the control of one group of a plurality of low-pressure reactive compensation power capacitor and adopt switching cycle and coding switching dual mode, controller is gathered electric current and magnitude of voltage, through simply calculating power factor or reactive current, and with power factor as switching threshold value (or control with reference to the reactive current value), the switching of control capacitor.This mode often caused mends or owes to mend, easily cause the switching concussion under the situation of underloading, influence the useful life of capacitor and the stability of electrical network, and this kind control mode switching precision is not high, uncompensated idle amount absolute value is relevant with the capacity of custom system, and the uncompensated idle loss that brings is big more in the big more system of capacity.3, circuit structure: except that the product of traditional non intelligentization, existing product adopts the core of a slice singlechip chip as electrical measurement and control mostly, if to satisfy the certainty of measurement of a plurality of physical quantitys, effectively separate the principal wave harmonic wave component and the complete machine controlled function is improved then will make soft, hardware is complicated, the complete machine failure rate increases, stability decreases, and the construction cycle prolongs, and development difficulty strengthens.
Summary of the invention:
The purpose of this utility model is to overcome the shortcoming that existing low-pressure reactive compensation technology exists, and provides a kind of novel structure, circuit is simple, certainty of measurement is higher, controlled function is perfect, the ladder multiple of condenser capacity and the low-voltage reactive power compensation switching device of various capacity numbers can rationally be set according to actual needs.
The technical scheme that the utility model adopted is a kind of low-voltage reactive power compensation switching device, it comprises control system and several low-pressure reactive compensation modules, its structural feature is that the low-pressure reactive compensation module is a global facility, control system is made of power circuit, demonstration and key circuit, special-purpose electrical measurement chip, sample circuit and single-chip microcomputer, is partly powered to other several electricity consumptions of control system by power circuit.
Electrical measurement chip and sample circuit and single-chip microcomputer join, sample circuit is used to gather the various electrical quantitys of electrical network, and be that the needed weak electric signal of electrical measurement chip is sent to the electrical measurement chip with the forceful electric power conversion of signals, the signal that the electrical measurement chip is sent sample circuit here is handled, and finish calculating, proofread and correct, carry out the transmitted in both directions that signal is finished in communication with single-chip microcomputer, the operating state of microcomputer monitoring electrical measurement chip, with the measurement result that the electrical measurement chip is sent here analyze, logic determines, calculating, with control low-pressure reactive compensation module operating state.
The low-pressure reactive compensation module is to be made of power capacitor and the control unit that is loaded in the side cover, control unit is by air switch or fuse, combination switch and drive circuit board, show and operation panel, module power supply circuit, external-connected port constitutes, by module power supply circuit power supply of the remaining circuit except that power capacitor and combination switch in module, fixture is housed on the power capacitor, fixture is connected in aggregates with side cover, combination switch and drive circuit board, demonstration and operation panel are fixed in the side cover, external-connected port is fixed on the drive circuit board, and side cover has perforate in external port.
The capacitance of each low-pressure reactive compensation module is not wait in the whole device, and generally speaking, the smallest capacitor capacitance is more little, and compensation precision is high more, and minimum capacity is 5 kilovars usually, and all the other condenser capacities are any non-zero integer multiples of smallest capacitor capacity.
Single-chip microcomputer, is controlled by the low-pressure reactive compensation module that step distributes built-in capacitance as the switching threshold value with the fundamental wave reactive power amount, and the step value of switching equals capacitor volume value in the minimum low-pressure reactive compensation module; Be used to protect this low-voltage reactive power compensation switching device with harmonic value, make this device when harmonic wave transfinites, be in blocking.
Advantage of the present utility model is: 1, unique modular construction is compared except having easy-to-connect with the traditional product that adopts similar structures, outside the advantages such as compact conformation, its advantage also is to throw off easily building-out capacitor and carries out the switching test, and the input indicator light on module " shows and operation panel " can reflect the operating state of combination switch truly, adopt the traditional product of similar structures and do the switching test owing to can not throw off building-out capacitor, even if adopt soft, hardware measure can not thrown off building-out capacitor, when module simulation input state is tested, input indicator light on its module or that module is external can not reflect the operating state of combination switch truly, so adopt the traditional product of similar structures can not do the delivery test of capacitor box easily.2, adopt the mode of " step switching " accurately to compensate according to detected fundamental wave reactive power amount to custom system is idle, this kind switching mode can be done minimum switching step value very meticulous, ladder multiple and various capacity number rationally are set, can be when taking into account minimum switching step value, make that again each low capacity electric capacity is not reused continually, this kind switching can compatible traditional switching cycle mode simultaneously.Adopt fundamental wave reactive power power can avoid the switching concussion better than employing reactive current or power factor in addition as the switching threshold value, and can compensate the idle of electrical network more accurately, (reactive current or power factor all can only reflect the reactive power of electrical network indirectly to make power factor infinitely approach 1, and the more just active power of power factor reflection and the ratio of apparent power, the uncompensated idle loss that brings is big more in the big more system of capacity), have big practical significance in this advantage aspect saving energy and reduce the cost.3, owing to adopt special-purpose electrical measurement chip and powerful technical grade single-chip microcomputer core as controller, make testing circuit simply and accurately and reliably, single-chip microcomputer only need be finished tasks such as simple computation, logic determines, compare soft, hardware with traditional similar products and all simplified significantly, but certainty of measurement, measurement project, complete machine stability etc. are greatly improved.
Description of drawings
Fig. 1 is a principle schematic of the present utility model
Fig. 2 is the utility model low-voltage reactive power compensation switching modular structure schematic diagram
Wherein: 1 side cover, 2 air switches or fuse 3 slip lids 4 capacitor top covers 5 fixtures 6 power capacitors 7 drive circuit boards 8 show and operation panel 9 external-connected ports 10 perforates 11 special-purpose electrical measurement chip 12 sample circuits 13 single-chip microcomputers 14 show and key circuit 15 power circuits 16 module power supply circuits 17 combination switches
Embodiment
The following examples can make the professional and technical personnel more understand the utility model, and following embodiment is made amendment, and it all is possible adding and replacing, and does not all exceed protection range of the present utility model.
As shown in Figure 1, a kind of low-voltage reactive power compensation switching device, it comprises control system and 30 low-pressure reactive compensation modules, each low-pressure reactive compensation module is a global facility, link to each other with control system by data wire (terminal 1,2), control system is made of power circuit 15, demonstration and key circuit 14, special-purpose electrical measurement chip 11, sample circuit 12 and single-chip microcomputer 13, is partly powered to other several electricity consumptions of control system by power circuit 15.Electrical measurement chip 11 joins with sample circuit 12 and single-chip microcomputer 13, sample circuit 12 is used to gather the various electrical quantitys of electrical network, and be that electrical measurement chip 11 needed weak electric signals are sent to the electrical measurement chip with the forceful electric power conversion of signals, the signal that electrical measurement chip 11 is sent sample circuit 12 here is handled, and finish calculating, proofread and correct, carry out the transmitted in both directions that signal is finished in communication with single-chip microcomputer 13, the operating state of single-chip microcomputer 13 monitoring electrical measurement chips 11, the measurement result that the electrical measurement chip is sent here is analyzed, logic determines, calculate, with control low-pressure reactive compensation module operating state.
Three-phase electricity is sent into control system and low-pressure reactive compensation module, the three-phase electricity of sending into control system is pressed with one and only sends into sample circuit 12 mutually, two phase voltages are also sent into power circuit 15 simultaneously except that sending into sample circuit 12 in addition, the three-phase sampling current send sample circuit 12 and the three-phase voltage of sending into sample circuit 12 simultaneously jointly through the collection of sample circuit, send special-purpose electrical measurement chip 11 to measure each parameter of electrical network after the conversion, the result of this parameter after single-chip microcomputer 13 is handled, one the tunnel send demonstration and key circuit 14, and another road gives each low-pressure reactive compensation module to control the switching of each module.Condenser capacity in 30 road low-pressure reactive compensation modules does not wait, building-out capacitor is pressed step and is distributed, so-called " step " is meant that the condenser capacity in several low-pressure reactive compensation moulds does not wait in the system, one smallest capacitor capacity is arranged, usually minimum capacity is 5 kilovars or littler, all the other are any non-zero integer multiples of smallest capacitor capacity, but the electric capacity number of every kind of capacity is not limit.
The signal that single-chip microcomputer 13 is sent is sent into each combination switch 17 through drive circuit board 7 processing of module earlier after entering the low-pressure reactive compensation module again.Single-chip microcomputer 13 be with the fundamental wave reactive power amount as the switching threshold value, the low-pressure reactive compensation module is controlled, the step value of switching equal step distribute in capacitor volume value in the minimum low-pressure reactive compensation module.
After three-phase electricity was sent into the low-pressure reactive compensation module, the one tunnel sent into the combination switch 17 of each low-pressure reactive compensation module, and the two-phase in another road is sent into each module power supply circuit 16.
The low-pressure reactive compensation module is to be made of power capacitor 6 and the control unit that is loaded in the side cover 1, control unit is by air switch or fuse 2, combination switch 17 and drive circuit board 7, show and operation panel 8, module power supply circuit 16, external-connected port 9 constitutes, by module power supply circuit 16 power supply of the remaining circuit except that power capacitor and combination switch in module, demonstration and operation panel 8 can be provided with and display module addresses with drive circuit board 7 actings in conjunction, show the switching state, this road module of manual switching, power capacitor 6 are separate unit three-phase triangle or three-phase star or two-phase or Monophase electric power capacitor.Clip has fixture 5 on the power capacitor 6, and fixture 5 is connected with side cover 1 by bolt.Combination switch 17 and drive circuit board 7, demonstration and operation panel 8 are fixed in the side cover 1, and external-connected port 9 is fixed on the drive circuit board 7, and side cover 1 has perforate 10 in external port, is convenient to the plug of external terminal.Capacitor top cover 4 is housed on the power capacitor 6, establishes slip lid 3 on the capacitor top cover 4, be convenient to when product is done experiment, power capacitor be separated with major loop, to satisfy the needs of various different tests conditions.The capacitor box major loop is connected with this device by air switch or fuse 2, and control loop is connected with this device by external terminal.
Operation principle of the present utility model is: the utility model adopts special-purpose electrical measurement chip and powerful technical grade single-chip microcomputer to guarantee the precision and the stability of complete machine on detecting, and is that the switching threshold value adopts the mode of " step " switching accurately to compensate custom system is idle with detected fundamental wave reactive power amount.Concrete switching scheme is as follows: can be provided with 30 the road or more electric capacity control loops, the predeterminable capacitance in each loop, as each loop capacity being set equates then with common identical by reactive power switching scheme, it is compatible common switching scheme, usually each tank capacitance capacity is pressed the step setting, all condenser capacities are any non-zero integer multiples of smallest capacitor capacity.Below all refer to by the step plan of establishment, system detects behind the electrical network fundamental wave reactive power power with default input thresholding and the excision thresholding compares and according to condition in the delay time and detected fundamental wave reactive power watt level, (the input capacity is a negative value according to capacity with all capacitors in the system (comprise and drop into and do not drop into), not the input capacity on the occasion of) carry out permutation and combination, determine that best of breed (is that capacity is the most approaching, required input or excision least number of times), then drop into or excise a certain road or a few road or single-phase one by one, two-phase, three-phase capacitor, this moment switching step value=minimum capacity capacity, as seen its minimum step value can be done very meticulously, and the capacitor that capacity is identical adopts the mode of switching cycle, promptly throw earlier and cut earlier, cut after throwing the back, and the ladder multiple can rationally be set the user according to actual needs and various capacity number can make each electric capacity do not reused continually again when taking into account minimum switching step value.Detection scheme is as follows: adopt special-purpose electrical measurement chip and peripheral cell and sample circuit to constitute testing circuit jointly; but the various electrical quantitys of detection of grid; wherein detected first-harmonic parameter is mainly as the switching foundation, and detected harmonic parameters is mainly used in harmonic protection.Because the professional testing circuit that makes of measured chip is simple and reliable, when guaranteeing certainty of measurement the failure rate of complete machine is reduced greatly.Element is to make things convenient for the user by way of compensation because the novelty of structure is so can continue to use traditional common type building-out capacitor, and the while only need be thrown off power capacitor simply owing to this kind of employing structure makes and be got final product when doing experiment.
Claims (7)
1. low-voltage reactive power compensation switching device, it comprises control system and several low-pressure reactive compensation modules, it is characterized in that, the low-pressure reactive compensation module is a global facility, control system is made of power circuit (15), demonstration and key circuit (14), special-purpose electrical measurement chip (11), sample circuit (12) and single-chip microcomputer (13), is partly powered to other several electricity consumptions of control system by power circuit (15).
2. according to the described low-voltage reactive power compensation switching device of claim 1, it is characterized in that, electrical measurement chip (11) joins with sample circuit (12) and single-chip microcomputer (13), sample circuit (12) is used to gather the various electrical quantitys of electrical network, and be that the needed weak electric signal of electrical measurement chip (11) is sent to the electrical measurement chip with the forceful electric power conversion of signals, the signal that the electrical measurement chip is sent sample circuit (12) here is handled, and finish calculating, proofread and correct, carry out the transmitted in both directions that signal is finished in communication with single-chip microcomputer (13), the operating state of single-chip microcomputer (13) monitoring electrical measurement chip (11), the measurement result that the electrical measurement chip is sent here is analyzed, logic determines, calculate, with control low-pressure reactive compensation module operating state.
3. according to the described low-voltage reactive power compensation switching device of claim 1, it is characterized in that building-out capacitor distributes by step in described several low-pressure reactive compensation modules, so-called " step " is meant that the condenser capacity in several low-pressure reactive compensation moulds does not wait in the system, one smallest capacitor capacity is arranged, all the other are any non-zero integer multiples of smallest capacitor capacity, but the electric capacity number of every kind of capacity is not limit.
4. according to the described low-voltage reactive power compensation switching device of claim 1, it is characterized in that, single-chip microcomputer (13) be with the fundamental wave reactive power amount as the switching threshold value, the low-pressure reactive compensation module is controlled.
5. according to the described low-voltage reactive power compensation switching device of claim 3, it is characterized in that, the switching of preset value that single-chip microcomputer (13) distributes according to building-out capacitor step in the module and measured fundamental wave reactive power amount control module, and the step value of switching equals the capability value of compensation condenser in the minimum low-pressure reactive compensation module.
6. according to the described low-voltage reactive power compensation switching device of claim 1, it is characterized in that, the low-pressure reactive compensation module is by power capacitor (6) and is loaded on the interior control unit formation of side cover (1), control unit is by air switch or fuse (2), combination switch and drive circuit board (7), show and operation panel (8), module power supply circuit (16), external-connected port (9) constitutes, by module power supply circuit (16) power supply of the remaining circuit except that power capacitor and combination switch in module, fixture (5) is housed on the power capacitor (6), and fixture (5) is connected with side cover (1) by bolt.
7. according to the described low-voltage reactive power compensation switching device of claim 6, it is characterized in that, combination switch (17) and drive circuit board (7), demonstration and operation panel (8) are fixed in the side cover (1), external-connected port (9) is fixed on the drive circuit board (7), and side cover (1) has been located perforate (10) at external connection end port (9).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920182616XU CN201541129U (en) | 2009-08-21 | 2009-08-21 | Low-voltage reactive compensation switching device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920182616XU CN201541129U (en) | 2009-08-21 | 2009-08-21 | Low-voltage reactive compensation switching device |
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| CN201541129U true CN201541129U (en) | 2010-08-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630846B (en) * | 2009-08-21 | 2012-01-11 | 福州同溢联创电气有限公司 | Low-voltage reactive power compensation switching device |
| CN102738802A (en) * | 2011-04-11 | 2012-10-17 | 山东迪生电气股份有限公司 | Single AD multichannel sampling control algorithm for line reactive power compensation device |
| CN103326372A (en) * | 2013-05-21 | 2013-09-25 | 国家电网公司 | Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching |
| CN107910878A (en) * | 2017-11-30 | 2018-04-13 | 浙江双峰电气有限公司 | A kind of intelligent low-pressure reactive-load compensation electric power capacity switching control method |
-
2009
- 2009-08-21 CN CN200920182616XU patent/CN201541129U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630846B (en) * | 2009-08-21 | 2012-01-11 | 福州同溢联创电气有限公司 | Low-voltage reactive power compensation switching device |
| CN102738802A (en) * | 2011-04-11 | 2012-10-17 | 山东迪生电气股份有限公司 | Single AD multichannel sampling control algorithm for line reactive power compensation device |
| CN103326372A (en) * | 2013-05-21 | 2013-09-25 | 国家电网公司 | Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching |
| CN107910878A (en) * | 2017-11-30 | 2018-04-13 | 浙江双峰电气有限公司 | A kind of intelligent low-pressure reactive-load compensation electric power capacity switching control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FUJIAN CHUANGHE ELECTRICAL CO., LTD. Free format text: FORMER OWNER: FUZHOU UNITED CREATION ELECTRIC EQUIPMENT CO., LTD. Effective date: 20150113 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 350001 FUZHOU, FUJIAN PROVINCE TO: 350112 FUZHOU, FUJIAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150113 Address after: Fuzhou Xiangqian town of Minhou County of Fujian province 350112 City Road No. 99-8 Xiang Longtai Industrial Zone Patentee after: Fujian Chuang Jie Electric Co., Ltd. Address before: 350001 23AB, block A, No. 61 middle 28, Gulou Middle Road, Gulou District, Fujian, Fuzhou, Fengxiang Patentee before: Fuzhou United Creation Electric Equipment Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20170821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |