CN102412584A - Integrated intelligent adjustment and compensation capacitor bank - Google Patents
Integrated intelligent adjustment and compensation capacitor bank Download PDFInfo
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- CN102412584A CN102412584A CN2011103828068A CN201110382806A CN102412584A CN 102412584 A CN102412584 A CN 102412584A CN 2011103828068 A CN2011103828068 A CN 2011103828068A CN 201110382806 A CN201110382806 A CN 201110382806A CN 102412584 A CN102412584 A CN 102412584A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention relates to an integrated intelligent adjustment and compensation capacitor bank, which comprises an intelligent adjustment and compensation capacitor bank switch circuit connected with an intelligent adjustment and compensation capacitor bank control circuit, and is characterized in that: the intelligent adjustment and compensation capacitor bank switch circuit comprises at least one capacitor which is accessed between two phase lines and between the phase line and a null line of a three-phase four-wire alternating current circuit, and each capacitor is connected with respective alternating current mutual inductors and respective switches in series; and the intelligent adjustment and compensation capacitor bank control circuit comprises an external control signal input circuit, an alternating current circuit transforming and sampling circuit, a keyboard display circuit, a temperature detection circuit, an RS232 serial communication interface circuit, an RS485 serial communication interface circuit, a state signal output circuit, an alternating current zero-crossing detection circuit and a relay isolated driving circuit, which are connected with an embedded microprocessor. The integrated intelligent adjustment and compensation capacitor bank has the advantages of fewer devices, small temperature rise, small volume, low power consumption, simple structure, high price performance, good energy-saving effect, long service life and the like.
Description
Technical field
The present invention relates to power supply and system and device, is that a kind of integral intelligent is transferred benefit capacitor group.
Background technology
The structure of existing low-voltage reactive power automatic compensation device all is that switch and some the protection assemblies by a controller and some low voltage power capacitors, switching low-voltage electric power capacitor assembles in screen, cabinet or case; It is high that its weak point exists the product cost, and volume is big, and inner distribution is complicated; The property tieed up is poor; Capacity does not have scalability, and the further intelligent difficulty of device is difficult to adapt to the needs that intelligent grid develops.Do not see the reported in literature and the practical application of integral intelligent accent benefit capacitor group so far as yet.
In China's low-voltage network, mainly adopt the distribution system of three-phase four-wire system, distribution transformer is the Y/YN0 mode of connection.Under the ideal situation, when three-phase load is balanced arrangement, the transformer symmetrical operation.But in fact owing to exist a large amount of single-phase loads at user side, and electricity consumption do not have a simultaneity, must make distribution transformer be in symmetrical operation state anything but, and promptly the active power of each phase and reactive power are all different.For the imbalance of reactive power, the method for employing phase splitting compensation can be mended idle, but powerless for the imbalance of active power, makes the electric current of transformer uneven more sometimes after the compensation on the contrary.And the asymmetric operation of distribution transformer can produce a large amount of negative-sequence currents and zero-sequence current, these negative-sequence currents and zero-sequence current meeting severe contamination electrical network; Increase the power loss of electrical network greatly; Reduce exerting oneself of transformer, threaten the safe operation of power distribution network, have a strong impact on power supply quality.Like negative-sequence current the electric energy metrical precision is declined to a great extent, cause economic loss to power supply department; Thereby negative-sequence current also can reduce exerting oneself of motor and make electric motor overheating reduce useful life, causes damage to the user.And the increase of zero-sequence current (current in middle wire) can make the copper loss of transformer and iron loss increase, and copper loss can reach normal 3 times under the extreme case.It is overheated that the zero sequence magnetic flux can make transformer when zero-sequence current was serious, even blow center line and burn switch, the safe operation of serious threat transformer and user's Electrical Safety; Zero-sequence current can cause the neutral point voltage skew simultaneously, and the big phase voltage of load is reduced, and the phase voltage of loading little raises, and can burn user's electrical appliance when serious.Using the best in the market reactive power compensator that branch is mended of can realizing compensates load; Also can only the reactive current in the system partly be mended; And it is powerless for asymmetric active current part; Sometimes but make the degree of unbalance of electric current might be bigger after the reactive power compensation, for addressing the above problem, the mode of the wage reform line adjustment of loading of can only regularly choosing of electric industry power supply department.
Summary of the invention
The know-why of the present invention's design: the basic reason of transformer asymmetric operation is that network is asymmetric to be caused and load in essence because sharing of load asynchronism unbalanced or electricity consumption causes.As long as will load the network symmetrization, just can make the transformer symmetrical operation.Thus; We can construct an impedance network that is made up of wattless component and be superimposed upon on the load network; Itself does not consume active power this network, and under the prerequisite of change of load active power characteristic not, makes the output current symmetry of transformer, the reactive power of compensation load simultaneously.This network is referred to as " transfer and mend network ".Constructing such accent benefit network is the key of dealing with problems.Because it is idle that this network only sends, and also can be referred to as reacance generator.Along with the development of modern power electronics technology, by the STATCOM that high-power electric and electronic switch element (IGBT or GTO) constitutes, can send equally four-quadrant idle, fully can instead of capacitor and reactor address this problem.But because at present the price of device for high-power power electronic is expensive, can't number of applications in the reactive power compensator of low voltage electric network.So adopt capacitor and reactor to constitute the selection that reacance generator is present feasible and reality.The alternate access wattless component that is applied in three-phase symmetrical power can shift the principle of burden with power; Adopt wattless component capacitor and reactor to construct a unsymmetric circuit network, make it to produce negative phase-sequence and zero-sequence current behind the access three-phase symmetrical power, its size equates with negative phase-sequence and zero-sequence current that load produces; And it is in the opposite direction; Balance out the negative phase-sequence and the zero-sequence current of load, final transformer is only exported forward-order current, realizes the symmetrical balance operation of transformer.
The burden with power of principle at first can adjust to(for) the network of using the wattless component configurations describes.
With reference to Figure 12, the vector analysis figure of overlap joint capacitor between phase line and the phase line.Ea, Eb, Ec are the symmetrical threephase source system, and after inserting capacitor C between a, the b phase, see mutually from a: Uc is a capacitance voltage, because the electric current in the electric capacity is ahead of 90 ° of capacitance voltages.So capacitance current Ic is perpendicular to capacitance voltage Uc, at this moment, a embody mutually one vertical and be ahead of a phase voltage capacitive reactive power current component+Iqc and with a phase voltage in the opposite direction bear merit current component-Ipc.See mutually from b: in like manner, capacitance current Ic is ahead of 90 ° of capacitance voltage Uc.At this moment, embody one mutually perpendicular to the capacitive reactive power current component+Iqc of b phase voltage and the positive active current component+Ipc identical at b with b phase voltage direction.Find out thus:, make the part active current of b phase be transferred to the b phase through cross-over connection capacitor C between b, b phase.
With reference to Figure 13, the vector analysis figure of overlap joint reactor between phase line and the phase line.Ea, Eb, Ec are the symmetrical threephase source system, and after the access inductance L, see mutually from a: UL is an inductive drop between a, the b phase, owing to 90 ° of inductive drops after the current hysteresis in the inductance.So inductive current IL is perpendicular to inductive drop UL.At this moment, embody one mutually perpendicular to the perceptual reactive current component-IqL of a phase voltage and the positive active current component+IpL identical at a with a phase voltage direction.See mutually from b: in like manner, inductive current IL is vertical and lag behind inductive drop UL.At this moment, b embody mutually one perpendicular to the perceptual reactive current component-IqL of b phase voltage and with the b phase voltage in the opposite direction bear merit current component-IpL.Find out thus:, make the part active current of b phase be transferred to a phase through cross-over connection inductance L between a, b phase.
According to above-mentioned principle, on the basis of traditional reactive-load compensator, adopt to constitute asymmetric compensation admittance Principles of Network by wattless component, can realize the active current phase modulation, simultaneously compensating power.But another problem of the thing followed is that required inductance in the compensator makes in actual device constitutes, but to be difficult to carry out because the big cost of volume is high.How required inductance in the solving device just becomes the restriction condition that device constitutes.In fact, exist a large amount of inductive loads in the customer charge system, can these inductive loads be regarded as the equivalent reactance device, so just solved a difficult problem of installing required reactor cleverly.Again through effective control mode; Appropriate in an amount of capacitor of each alternate overlap joint; Then can make the load of transformer obtain reasonably balanced the distribution; And idle being compensated so not only can be adjusted to balance with three alternate uneven active currents, and can three-phase activity coefficient all be compensated to 1.
Technical problem to be solved by this invention is; Overcome the deficiency of prior art; Based on the know-why of design, provide a kind of central controlled pattern become the pattern of decentralized control, centralized management, have that device is few, temperature rise is little, volume is little, low in energy consumption, simple in structure, the ratio of performance to price is high; Energy-saving effect is good, and the integral intelligent of long service life is transferred and mended the capacitor group.
The technical scheme that solves its technical problem employing is; A kind of integral intelligent is transferred and is mended the capacitor group; It comprises that intelligent benefit capacitor group switching circuit and the intelligence accent benefit capacitor group control circuit transferred is connected; It is characterized in that: described intelligence is transferred and is mended that capacitor group switching circuit is included between the phase line and phase line of three-phase and four-line alternating current circuit, all insert at least one capacitor between phase line and the zero line, and every capacitor all is connected in series current transformer and switch separately separately; Described intelligence transfers benefit capacitor group control circuit to comprise that external control signal input circuit, AC signal conversion and sample circuit, keyboard-display circuit, temperature sensing circuit, RS232 serial communication interface circuit, RS485 serial communication interface circuit, status signal output circuit, ac zero-crossing detection circuit and relay isolated drive circuit all are connected with embedded microprocessor.
The model of described embedded microprocessor U2 is LPC2138.
Described external control signal input circuit comprises that terminal J2, model TLP521 optocoupler U19, resistance R 40 are connected with R41, and the switching value of outside is input to model LPC2138 embedded microprocessor U2 after model TLP521 optocoupler U19 isolates.
Described relay isolated drive circuit comprises with several capacitors count and equating; The model GRT-508A_P magnetic latching relay that is used for several capacitors of switching; Model MC1416 chip for driving U12, U19, U24, U29; Model TLP521-4 optocoupler U10, U13, U15, U21, U26, U28 and current-limiting resistance R22, R26, R27, R34, R54 are connected, and are control signal isolation, the action of driving model GRT-508A_P magnetic latching relay of LPC2138 embedded microprocessor U2 with model.
Described status signal output circuit comprises binding post J1; Normally opened contact relay R L13; Sustained diode 26, model MC1416 chip for driving U63, model TLP521-4 optocoupler U62; Triode U61 is connected with resistance R 106, R105, and model is state output signal isolation, the amplification of LPC2138 embedded microprocessor U2 and drives electromagnetic relay action output.
Described AC signal conversion and sample circuit comprise the passage synchronized sampling chip of model C S5451; Divider resistance R51, R54, R52, R55, R53, R56; Relay LS1, LS2, LS3 summation current transformer T1, T2, T3, T12, T12, T13, T14, T15, T16 are connected, and alternating voltage are converted into the required sampled voltage of passage synchronized sampling chip of model C S5451.
Described ac zero-crossing detection circuit comprises that model TLP521 optocoupler U1 is connected with resistance R 13, R14, R86, R87; Model TLP521 optocoupler U1 is output as and exchanges synchronous square wave ZERO signal; Described ZERO signal is a low level by the high level saltus step, sends into model LPC2138 embedded microprocessor U2 and handles.
Described RS232 serial communication interface circuit comprises model TLP521-2 optocoupler U60; Model MAX3232EEAE level transferring chip U48; Terminal J35; Resistance R 102～R104 is connected with capacitor C 28, C29, C30, C35, C36, and the general serial mouth UART0 of model LPC2138 embedded microprocessor U2 is connected with model MAX3232EEAE level transferring chip U48 through model TLP521-2 optocoupler U60, is used for signal and receives and send.
Described RS485 serial communication interface circuit comprises jumper cap J34; Model MAX3485 level transferring chip U31, model 6N137 optocoupler U29, U32, U36, transition diode D9, D15～D19; Resistance R 56～R58, R60～R63, R100 and capacitor C 18 are connected; The general serial mouth UART0 of model LPC2138 embedded microprocessor U2 is connected with model MAX3485 level transferring chip U31 through model 6N137 optocoupler, is used for capacitor group swap data, realizes group net operation.
Described temperature sensing circuits etc. comprise plurality of temperature sensor chip T, T1, T2; Model is DS18B20; This temperature sensor chip converts the temperature T 1 of the capacitor body of real-time perception, T2 and ambient temperature T to digital quantity and sends into model LPC2138 embedded microprocessor U2 processing with monobus, realizes the temperature detection of capacitor group.
Integral intelligent of the present invention transfers the advantage applies of mending the capacitor group to exist:
Because capacitor group of the present invention is alternate at AB respectively, BC is alternate, CA is alternate, between the AN, respectively insert at least one capacitor between the BN, between the CN; The terminal of each capacitor is drawn separately; Through realizing independent control in the switch incoming transport circuit, make each capacitor can drop into or withdraw from three phase mains separately separately to each capacitor; Transfer benefit capacitor group switching circuit to mend capacitor group control circuit with the intelligence accent intelligence and link together, employing corner connection, star connect mode in succession, constitute the integrated apparatus of low-voltage reactive compensator capable; This integrated apparatus has possessed all functions of traditional reactive power compensator, promptly can be as complete reactive power compensator isolated operation, also can a plurality of parallelly connected networkings, as a big capacity compensation arrangement operation; Because each capacitor can be controlled switching separately; Can make capacitor between alternate and Relative Zero, realize inequality combination in any phase-splitting control switching; Not only realize reactive power compensation, also can realize active power is alternately carried out equalization adjustment three that power back-off is stable; Can realize phase place zero passage control switched capacitor, eliminate and shove, reduce equipment loss and the useful life of improving capacitor the impact of line voltage;
2. intelligence of the present invention transfers benefit capacitor group control circuit to have the capacitor body of detection and ambient temperature function; The function that also has the Measurement of capacitor capacitance; Through the cooperation of software, realize capacitor group life-cycle condition managing, satisfied the requirement of intelligent grid to access device;
3. the present invention has structurally broken through the notion of existing low-pressure reactive compensation equipment; Complete compensator is integrated, componentization change central controlled pattern the new model of decentralized control, centralized management into, have that device is few, temperature rise is little, volume is little, low in energy consumption, simple in structure, be prone to realize standardization, standardization; Capacity maximizes; And dilatation, easy to maintenance, resource are decreased than traditional product with electricity and reduced about 50%, and be more electric more than 10% than traditional simple reactive power compensator more piece.
4. the invention solves and when carrying out reactive power compensation, adjust the asymmetric difficult problem of distribution transformer active current automatically, reduce the neutral point voltage skew, improved power supply quality.
Description of drawings
Fig. 1 is that integral intelligent of the present invention is transferred benefit capacitor group schematic block circuit diagram;
Fig. 2 is that intelligence is transferred benefit capacitor group control circuit 2 theory diagrams;
Fig. 3 is relay isolated drive circuit 3 schematic diagrams;
Fig. 4 is status signal output circuit 4 schematic diagrams;
Fig. 5 is external control signal input circuit 5 schematic diagrams;
Fig. 6 is AC signal conversion and sample circuit 6 schematic diagrams;
Fig. 7 ac zero-crossing detection circuit 7 schematic diagrams;
Fig. 8 is RS232 serial communication interface circuit 8 schematic diagrams;
Fig. 9 is RS485 serial communication interface circuit 9 schematic diagrams;
Figure 10 is temperature sensing circuit 10 schematic diagrams;
Figure 11 is embedded microprocessor 11 schematic diagrams in the control circuit;
Figure 12 is the vector analysis figure of overlap joint capacitor between phase line and the phase line;
Figure 13 is the vector analysis figure of overlap joint reactor between phase line and the phase line.
Among the figure: 1 intelligence is transferred and is mended capacitor group switching circuit, and 2 intelligence are transferred and mended capacitor group control circuit, 3 relay isolated drive circuits; 4 status signal output circuits, 5 external control signal input circuits, 6 AC signal conversion and sample circuits; 7 ac zero-crossing detection circuits, 8RS232 serial communication interface circuit, 9RS485 serial communication interface circuit; 10 temperature sensing circuits, 11 embedded microprocessors, 12 keyboard-display circuits.
Embodiment
Utilize accompanying drawing and embodiment that the present invention is further described below.
See figures.1.and.2, a kind of integral intelligent of the present invention transfers benefit capacitor group to comprise that intelligent benefit capacitor group switching circuit 1 and the intelligence accent benefit capacitor group control circuit 2 transferred is connected.Described intelligence is transferred and is mended that capacitor group switching circuit 1 is included in that the AB of three-phase and four-line alternating current circuit is alternate, BC is alternate, CA is alternate, between the AN, between the BN, at least one capacitor be set between the CN, every capacitor series current transformer separately is connected with the three-phase and four-line alternating current circuit with separately switch.Embodiment of the present invention adopts capacitor C1～C6 totally 6 capacitors; Current transformer CT1～CT6 is totally 6 instrument transformers; Switch J1～J6 is totally 6 switches, and per three capacitor package are in a shell, and each shell has six terminals to link to each other with the wiring of capacitor to constitute two group capacitor groups; Two group capacitor groups all adopt the corner connection connected mode or all adopt star to connect mode in succession, or one group of corner connection, another group star connect mode in succession.Every group capacitor can be used as complete reactive power compensator isolated operation.Embodiment of the present invention is the execution mode of two group capacitor groups, but does not limit to this embodiment, can process capacitor group more than two groups according to user's needs, and the best is four group capacitor groups.A kind of integral intelligent of the present invention transfers benefit capacitor group also can be moved as a big capacity compensation arrangement by several parallelly connected networkings.Described intelligence transfers benefit capacitor group control circuit 2 to comprise: external control signal input circuit 5, AC signal conversion and sample circuit 6, keyboard-display circuit 12, temperature sensing circuit 10, RS232 serial communication interface circuit 8, RS485 serial communication interface circuit 9, status signal output circuit 4, ac zero-crossing detection circuit 7 and relay isolated drive circuit 3 all are connected with embedded microprocessor 11.Miniature circuit breaker DL also has the overload and the short-circuit protection function of circuit concurrently as inserting switch.
With reference to Fig. 2, described keyboard-display circuit 12 models adopt the ZLG7290 special chip, and through 12C bus and embedded microprocessor 11, promptly embedded microprocessor U2 connects.
With reference to Fig. 3; Described relay isolated drive circuit 3 comprises with several capacitors count and equating; The model GRT-508A_P magnetic latching relay that is used for several capacitors of switching; Model MC1416 chip for driving U12, U19, U24, U29, model TLP521-4 optocoupler U10, U13, U15, U21, U26, U28 and current-limiting resistance R22, R26, R27, R34, R54 are connected.Intersect from the input control end of the capable control bus Colum_1Colum_2Colum_3Colum_4Colum_5 of embedded microprocessor U2 and row control bus Row_1Row_2Row_3Row_4Row_5 and optocoupler U10U13U15U21U26U28 and to form 24 path switching circuits.One the tunnel being example wherein: the course of work: when Row_1 is a low level; Row_2Row_3Row_4Row_5 is a high level; Colum_1 is a high level simultaneously, when Colum_2Colum_3Colum_4Colum_5 is low level, and the 15 pin positions of model TLP521-4 optocoupler U10 output 12V voltage; This 12V voltage is through the 1 pin position of model MC1416 chip for driving U12; Make corresponding output 16 pin position output low levels, thereby it is electric that magnetic latching relay RL1 closing coil is got, accomplish the control action of control magnetic latching relay RL1.Other road by that analogy.The function of described relay isolated drive circuit 3 is: the action of model GRT-508A_P magnetic latching relay is isolated, driven to the control signal of embedded microprocessor U2.
With reference to Fig. 4; Described status signal output circuit 4 comprises binding post J1, normally opened contact relay R L13, sustained diode 26; Model MC1416 chip for driving U63; Model TLP521-4 optocoupler U62, triode U61 is connected with resistance R 106, R105, with state output signal amplification, isolation and the driving electromagnetic relay action output of embedded microprocessor U2.The operation principle of described status signal output circuit 4 is: 1 pin of triode U61 meets embedded microprocessor U2; After model TLP521-4 optocoupler U62 obtains the high-level control signal from triode U61; The 15 pin positions output 12V high level of model TLP521-4 optocoupler U62; After the 1 pin position of model MC1416 chip for driving U63 obtained high level, its output 16 pin positions are output low level immediately, and this moment, electromagnetic relay RL13 got; Normally opened contact is closed, thereby realizes outside circuit control.
With reference to Fig. 5, described external control signal input circuit 5 comprises that terminal J2, model TLP521 optocoupler U19, resistance R 40 are connected with R41, the switching value of outside is isolated being input to embedded microprocessor U2 through model TLP521 optocoupler U19.The operation principle of described external control signal input circuit 5 is: when external passive node closure; Thereby make input 1 pin position and the 2 pin position conductings of model TLP521 optocoupler U19; The 4 pin positions of optocoupler U19 are low level by the high level saltus step, and sending into model is the embedded microprocessor U2 processing of LPC2138.
With reference to Fig. 6; Described AC signal conversion and sample circuit 6 comprise that model is the 6 passage synchronized sampling chips of CS5451; Divider resistance R51, R54, R52, R55, R53, R56; Relay LS1, LS2, LS3, current transformer T1, T2, T3, T12, T12, T13, T14, T15, T16 are connected, AC signal conversion and sample circuit 6 operation principles are: the A phase alternating voltage of three-phase four-wire system via R51R54 series resistance dividing potential drop after; Obtain the signal of crest voltage, send into synchronized sampling chip 5451 after this signal switches via relay LS1 and handle less than 800mV.The rest may be inferred for B phase C phase operation principle.Behind the A phase alternating current process current transformer T1, be processed into the signal of alternating voltage, send into synchronized sampling chip 5451 after this signal switches via relay LS2 and handle less than 800mV.The rest may be inferred for B phase C phase operation principle.Relay is used to switch the signal circuit that needs conversion, like need outside AC signal is sampled, and is then connected by the contact 23 and 67 of microprocessor control relay LS1S2LS3; Like need the current signal of capacitor group branch road is sampled, then connect by the contact 2,4 and 5,7 of embedded microprocessor U2 control relay LS1, LS2, LS3.
With reference to Fig. 7, described ac zero-crossing detection circuit 7 comprises that model TLP521 optocoupler U1 is connected with resistance R 13, R14, R86, R87.The operation principle of ac zero-crossing detection circuit 7 is: behind the input of the A phase alternating voltage of three-phase four-wire system through current-limiting resistance R13, R14, R86R87 and model TLP521 optocoupler U1 light-emitting diode; On the A phase voltage during zero passage; The output conducting of model TLP521 optocoupler U1; This moment, the ZERO signal was a low level by the high level saltus step, sent into model LPC2138 embedded microprocessor U2 and handled.
With reference to Fig. 8, described RS232 serial communication interface circuit 8 comprises model TLP521-2 optocoupler U60, model MAX3232EEAE level transferring chip U48, and terminal J35, resistance R 102～R104 is connected with capacitor C 28, C29, C30, C35, C36.The operation principle of described RS232 serial communication interface circuit 8 is: external data signal is input to the 8 pin positions of level transferring chip U48 via the 3 pin positions of binding post J35; Level after the conversion is outputed to the 4 pin positions of optocoupler U60 by the 9 pin positions of U48; Signal is sent into model LPC2138 embedded microprocessor U2 through after isolating by the 6 pin positions of optocoupler U60; Data-signal from model LPC2138 embedded microprocessor U2 sends is imported via the 2 pin positions of optocoupler U60; The 8 pin position output levels of optocoupler U60 are to the 10 pin positions of level transferring chip U48, make signal after the 7 pin positions output conversion of level transferring chip U48 via the 2 pin positions output of binding post J35.
With reference to Fig. 9; Described RS485 serial communication interface circuit 9 comprises jumper cap J34, model MAX3485 level transferring chip U31, model 6N137 optocoupler U29, U32, U36; Transition diode D9, D15～D19, resistance R 56～R58, R60～R63, R100 and capacitor C 18.The operation principle of RS485 serial communication interface circuit 9 is: outside input difference data-signal is input to 6 pin positions and the 7 pin positions of model MAX3485 level transferring chip U31 through transition diode D9, D15～D19 pressure limiting; Common-mode signal after the processing is by the 1 pin position output of model MAX3485 level transferring chip U31; The 3 pin positions of model 6N137 optocoupler U29 receive data-signal simultaneously; Through exporting by the 6 pin positions of model 6N137 optocoupler U29 after the isolation processing, send into model LPC2138 embedded microprocessor U2.Model LPC2138 embedded microprocessor U2 sends data-signal by two steps; The first step: the signal from model LPC2138 embedded microprocessor U2 is imported via the 3 pin positions of model 6N137 optocoupler U32; Through exporting by the 6 pin positions of optocoupler model 6N137U32 behind the isolating chip U32, send into 2 pin positions and the 3 pin positions of model MAX3485 level transferring chip U31 simultaneously; Second step: send the 3 pin positions isolation of data-signal process model 6N137 isolating chip U36 from the common mode of model LPC2138 embedded microprocessor U2 after; 6 pin positions output by model 6N137 isolating chip U36; Send into the 4 pin positions of model MAX3485 level transferring chip U31; After being processed into differential signal, see off by the 6 pin positions and the 7 pin positions of model MAX3485 level transferring chip.
With reference to Figure 10, described temperature sensing circuit 10 comprises 3 model DS18B20 temperature sensor chips.Temperature sensing circuit 10 operation principles are: model DS18B20 temperature sensor chip converts the temperature of the capacitor body of real-time perception and ambient temperature to digital quantity and sends into model LPC2138 embedded microprocessor U2 with monobus and handle; Realize the temperature survey of capacitor group; And then realize capacitor group life-cycle condition managing, to satisfy the demand of intelligent grid.
With reference to Figure 11, described embedded microprocessor 11 is that intelligence is transferred the core component of mending capacitor group control circuit 2, promptly is that model is the embedded microprocessor U2 of LPC2138.
Integral intelligent of the present invention transfers the used components and parts of benefit capacitor group to be the commercially available prod.
Integral intelligent of the present invention transfers benefit capacitor group on probation through 6 months, has realized the object of the invention and has reached described effect.
Claims (10)
1. an integral intelligent is transferred and is mended the capacitor group; It comprises that intelligent benefit capacitor group switching circuit and the intelligence accent benefit capacitor group control circuit transferred is connected; It is characterized in that: described intelligence is transferred and is mended that capacitor group switching circuit is included between the phase line and phase line of three-phase and four-line alternating current circuit, all insert at least one capacitor between phase line and the zero line, and every capacitor all is connected in series D.C mutual-inductor and switch separately separately; Described intelligence transfers benefit capacitor group control circuit to comprise that external control signal input circuit, AC signal conversion and sample circuit, keyboard-display circuit, temperature sensing circuit, RS232 serial communication interface circuit, RS485 serial communication interface circuit, status signal output circuit, ac zero-crossing detection circuit and relay isolated drive circuit all are connected with embedded microprocessor.
2. integral intelligent according to claim 1 is transferred and is mended the capacitor group, and it is characterized in that: the model of described embedded microprocessor (U2) is LPC2138.
3. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described external control signal input circuit comprises that terminal (J2), model TLP521 optocoupler (U19) and resistance (R40, R41) are connected, with switching value input model LPC2138 embedded microprocessor (U2) after model TLP521 optocoupler (U19) is isolated of outside.
4. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described relay isolated drive circuit comprises with several capacitors count and equating; The model GRT-508A_P magnetic latching relay that is used for several capacitors of switching; Model MC1416 chip for driving (U12, U19, U24, U29); Model TLP521-4 optocoupler (U10, U13, U15, U21, U26, U28) is connected with current-limiting resistance (R22, R26, R27, R34, R54), is control signal isolation, the action of driving model GRT-508A_P magnetic latching relay of LPC2138 embedded microprocessor (U2) with model.
5. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described status signal output circuit comprises binding post (J1), normally opened contact relay (RL13), fly-wheel diode (D26); Model MC1416 chip for driving (U63); Model TLP521-4 optocoupler (U62), triode (U61) is connected with resistance (R106, R105), and model is state output signal isolation, the amplification of LPC2138 embedded microprocessor (U2) and drives electromagnetic relay action output.
6. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described AC signal conversion and sample circuit comprise the passage synchronized sampling chip of model C S5451; Divider resistance (R51, R54, R52, R55, R53, R56); Relay (LS1, LS2, LS3) summation current transformer (T1, T2, T3, T12, T12, T13, T14, T15, T16) is connected, and alternating voltage is converted into the required sampled voltage of passage synchronized sampling chip of model C S5451.
7. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described ac zero-crossing detection circuit comprises that model TLP521 optocoupler (U1) is connected with resistance (R13, R14, R86, R87); Model TLP521 optocoupler (U1) is output as and exchanges synchronous square wave ZERO signal; Described ZERO signal is a low level by the high level saltus step, sends into model LPC2138 embedded microprocessor (U2) and handles.
8. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described RS232 serial communication interface circuit comprises model TLP521-2 optocoupler (U60); Model MAX3232EEAE level transferring chip (U48); Terminal (J35); (R102～R104) be connected with electric capacity (C28, C29, C30, C35, C36), the general serial mouth UART0 of model LPC2138 embedded microprocessor (U2) is connected with model MAX3232EEAE level transferring chip (U48) through model TLP521-2 optocoupler (U60) resistance, is used for signal and receives and send.
9. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described RS485 serial communication interface circuit comprises jumper cap (J34); Model MAX3485 level transferring chip (U31), model 6N137 optocoupler (U29, U32, U36), the transition diode (D9, D15～D19); Resistance (R56～R58, R60～R63, R100) is connected with electric capacity (C18); The general serial mouth UART0 of model LPC2138 embedded microprocessor (U2) is connected with model MAX3485 level transferring chip (U31) through model 6N137 optocoupler, is used for capacitor group swap data, realizes group net operation.
10. integral intelligent according to claim 1 is transferred and is mended the capacitor group; It is characterized in that: described temperature sensing circuit comprises several models DS18B20 temperature sensor chip; Model DS18B20 temperature sensor chip converts the temperature of the capacitor body of real-time perception and ambient temperature to digital quantity and sends into model LPC2138 embedded microprocessor U2 with monobus and handle, and realizes the temperature adjusting of capacitor group.
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| CN2011103828068A CN102412584A (en) | 2011-11-28 | 2011-11-28 | Integrated intelligent adjustment and compensation capacitor bank |
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| CN2011103828068A CN102412584A (en) | 2011-11-28 | 2011-11-28 | Integrated intelligent adjustment and compensation capacitor bank |
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| CN103683300A (en) * | 2012-09-06 | 2014-03-26 | 深圳市三和电力科技有限公司 | Dynamic STS reactive power compensation switching regulator |
| CN103701141A (en) * | 2014-01-08 | 2014-04-02 | 福建阳谷智能技术有限公司 | Novel multifunctional coding switch |
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Owner name: JILIN CITY LONGHUA POWER TECHNOLOGY CO., LTD. ELEC Free format text: FORMER OWNER: JILIN CITY LONGHUA POWER TECHNOLOGY CO., LTD. Effective date: 20121112 |
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Effective date of registration: 20121112 Address after: 130021 Jilin City, Changchun province people's street, No. 4433 Applicant after: Jilin Academy of Electric Power Science Applicant after: Jilin City Longhua Power Technology Co., Ltd. Applicant after: Electric Power Research Institute of Jilin Electric Power Company Applicant after: State Grid Corporation of China Address before: 130021 Jilin City, Changchun province people's street, No. 4433 Applicant before: Jilin Academy of Electric Power Science Applicant before: Jilin City Longhua Power Technology Co., Ltd. |
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Application publication date: 20120411 |