CN102157945B - Individual compensation type low-voltage intelligent combined reactive power compensator - Google Patents
Individual compensation type low-voltage intelligent combined reactive power compensator Download PDFInfo
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- CN102157945B CN102157945B CN201010515442.1A CN201010515442A CN102157945B CN 102157945 B CN102157945 B CN 102157945B CN 201010515442 A CN201010515442 A CN 201010515442A CN 102157945 B CN102157945 B CN 102157945B
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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
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- 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
Abstract
The invention relates to an individual compensation type low-voltage intelligent combined reactive power compensator, wherein a CPU (central processing unit) is connected with a control panel unit; the CPU is connected with an external RS485 communication unit; the CPU is connected with a temperature sensor unit; the CPU is connected with the switching unit of an output control power switch; the CPU is connected with a signal amplification rectifying circuit and collects the voltage and current data of a power grid; the switching unit of the output control power switch is connected with a power switching module through a wiring terminal; and a zero-crossing switching IC (integrated circuit) is arranged in the power switching module. The individual compensation type low-voltage intelligent combined reactive power compensator provided by the invention has the advantages of safety in switching, small impulse current on the power grid, long service life, low cost, and overvoltage, overcurrent and overtemperature protection, and is simple, convenient and visual in installation operation, and common electricians are needed as operating personnel to guarantee that the equipment is reliably operated.
Description
Technical field
The utility model relates to the Intelligent combined power capacitor for low pressure 0.4KV reactive power compensation, is a kind of minute compensation type low-voltage intelligent combined reactive power compensator specifically.
Background technology
The electric energy that current electrical network is used is mainly used for commercial power, account for greatly 70% left and right, and the commercial power overwhelming majority is for inductive load, as motor etc., also has part for resistive load, as electric heating etc.Power utilization environment is intricate, for example: the frequent starting of motor, stop, electric heating is according to the size of temperature required Modulating Power, and electric heating much only use single-phase, i.e. AC220V power supply.To this, shunt capacitor on the line conventionally, to supplement the reactive power loss of circuit.Added in advance in advance in the past capacitor, easily in the low power consumption stage, occurred mending, basic eliminating do not used now.User's reactive power compensation measure is now all at 0.4KV switchboard end, by power factor controller, to control the switching of many group power capacitors conventionally, makes power factor reach 0.95 left and right.
Existing switchboard reactive power compensation mechanism comprises: electric power knife switch, and fuse, reactive power compensation checkout gear, the special-purpose switching relay of capacitor, power capacitors etc., as need reach harmonic carcellation function, also need separately to add harmonic wave and eliminate reactance coil.There is following shortcoming in it: switching electric current is large, and circuit is produced to surge impact electric current, and the special-purpose switching relay contact endurance of capacitor is short, and wiring is numerous and diverse, takes up room large, and Maintenance and Repair are inconvenient, and cost is high, and mechanical connecting element is many, and equipment easily lost efficacy.And existing intelligence or the intelligent product of class on market, operation and control interface is all more loaded down with trivial details, very high to controlling personnel's specification requirement, need special messenger's tracking technique to instruct, cannot large area popularize, limited greatly promoting the use of of reactive power compensator, cause energy waste.
Utility model content
For the defect existing in prior art; the purpose of this utility model is to provide a kind of minute compensation type low-voltage intelligent combined reactive power compensator; switching safety; little to electrical network impulse current; long-life, low cost, has overvoltage, overcurrent, overheat protector; fitting operation is easy, directly perceived, and operating personnel are only required to common electrician just can guarantee equipment reliability service.
For reaching above object, the technical scheme that the utility model is taked is:
A minute compensation type low-voltage intelligent combined reactive power compensator, is characterized in that, comprising:
A supply convertor 1, receives the input of AC380v power supply, for CPU element 5 and following unit, circuit provide a road VCC-5v, a road VDD+12v, two-way VDD+5v power supply; Wherein, main power source VDD1+5v is for CPU element 5, VDD1+5V and VCC-5V offer signal amplification rectification circuit 3 simultaneously, VDD2+12V supplies with each operating passing zero IC10 in first, second, third power switching module 7A, 7B, 7C and power switching module, and VDD3+5V offers RS485 communication unit 8;
CPU element 5 is connected with a control panel unit 4 by cable, and control panel unit 4 is for human-computer dialogue and show relevant information;
CPU element 5 is connected with a RS485 communication unit 8 by cable;
CPU element 5 is connected with temperature sensing amplifier unit 9 by cable; Temperature sensing amplifier unit 9, for gathering capacitor temperature, is realized overheat protector to capacitor;
CPU element 5 is amplified rectification circuit 3 by cable and signal and is connected;
Signal amplifies the data that rectification circuit 3 receives signal gathering unit 2;
Described signal gathering unit 2 comprises three voltage transformers 21 and three current transformers 22; Current transformer 22 detects the electric current of three-phase, and voltage transformer 21 detects the voltage of three-phase;
CPU element 5 is connected with output power ratio control switch on-off unit 6 by cable;
Output power ratio control switch on-off unit 6 is connected with first, second, third power switching module 7A, 7B, 7C by splicing ear, in described each power switching module, is equipped with an operating passing zero IC10;
Three power capacitor CAP1, the CAP2 that first, second, third power switching module 7A, 7B, 7C are connected with " star-like ", CAP3 connect.Three power capacitors that power capacitor CAP1, CAP2, CAP3 are the low pressure 0.4KV for compensating.
On the basis of technique scheme, the K1 pin of the first power switching module 7A is connected with the A of three-phase phase line,
The K1 pin of the second power switching module 7B is connected with the B of three-phase phase line,
The K1 pin of the 3rd power switching module 7C is connected with the C of three-phase phase line,
The A1 terminal of three power capacitors that the K2 pin of the first power switching module 7A is connected with " star " connects,
The B1 terminal of three power capacitors that the K2 pin of the second power switching module 7B is connected with " star " connects,
The C1 terminal of three power capacitors that the K2 pin of the 3rd power switching module 7C is connected with " star " connects,
Neutral line N connects the neutral point of three power capacitors.
On the basis of technique scheme, the model of CPU element 5 is STC12C5620AD.
On the basis of technique scheme, 4 bottoms, control panel unit are provided with setting key, upwarding key, down Arrow, and middle part is provided with a main LED display box, are provided with the LED light of some demonstration work at present states around main LED display box.
On the basis of technique scheme, temperature sensing amplifier unit 9 comprises a thermistor RT, thermistor RT is a NTC device, be subject to variations in temperature, itself resistance also can reduce, and thermistor RT connects with divider resistance after dividing potential drop and is input to CPU element 5, after CPU element 5 internal simulations/digital conversion, with the 4 set point contrasts of control panel unit, judge whether excess temperature, whether cut off power capacitor.
On the basis of technique scheme, the model of current transformer 22 is CT05-1, the signal code of the 0-5A that current transformer 22 produces the distribution three-phase input current by primary current instrument transformer is transformed into 5 receptible current signals of CPU element, after CPU element 5 internal simulations/digital conversion, measure power network current signal; And CPU element 5 and external power system are carried out to electrical isolation;
The model of voltage transformer 21 is PT01-4, voltage transformer 21 is transformed into 5 receptible voltage signals of CPU element by distribution voltage 220V, and CPU element 5 and external power system are carried out to electrical isolation, after CPU element 5 internal simulations/digital conversion, contrast with control panel unit 4 set points, detect whether overvoltage, under-voltage, when overvoltage, cut off power capacitor, when under-voltage, forbid dropping into power capacitor, but allow excision power capacitor, thereby guarantee that power capacitor reliability service can not damage;
Meanwhile, three-phase voltage signal and three-phase current signal contrast, according to the gap at phase angle, calculating reactive power size, when this reactive power surpasses control panel unit 4 set point, drops into power capacitor, carry out reactive power compensation, promote power circuit power supplying efficiency.
On the basis of technique scheme, output power ratio control switch on-off unit 6 is controlled by CPU element 5, by controlling first, second, third power switching module 7A, the S2 of 7B, 7C and the level of S4 pin, closed or disconnect each power switching module;
The S1 pin of power switching module is connected with power vd D2+12V with S3 pin,
S1, S2 pin are connected to the coil two ends of the magnetic latching relay J1 being located in power switching module,
S3, S4 pin are connected to the operating passing zero IC10 being located in power switching module,
In power switching module, be also provided with thyristor SCR1 and the SCR2 of reverse parallel connection,
A contact in a pair of normally opened contact of magnetic latching relay J1 connects the anode A utmost point of thyristor SCR1, the negative electrode K utmost point of SCR2, and another contact connects the negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2,
The negative electrode K utmost point of the anode A utmost point of thyristor SCR1, SCR2 is connected to K1 terminal,
The negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2 are connected to K2 terminal,
An output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR1, and another output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR2.
On the basis of technique scheme, operating passing zero IC10 model is MOC3083.
Described in the utility model minute compensation type low-voltage intelligent combined reactive power compensator; switching safety; little to electrical network impulse current; long-life; low-cost; have overvoltage, overcurrent, overheat protector, fitting operation is easy, directly perceived, and operating personnel are only required to common electrician just can guarantee equipment reliability service.
Accompanying drawing explanation
The utility model has following accompanying drawing:
Fig. 1 divides the structured flowchart of compensation type low-voltage intelligent combined reactive power compensator,
Fig. 2 control panel cell schematics,
Fig. 3 operating passing zero IC structural representation.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Described in the utility model minute compensation type low-voltage intelligent combined reactive power compensator, take CPU element 5 as core, by three voltage transformers and three current transformers, outside voltage signal, current signal is sampled.Its concrete structure as shown in Figure 1, comprising:
A supply convertor 1, receives the input of AC380v power supply, for CPU element 5 and following unit, circuit provide a road VCC-5v, a road VDD+12v, two-way VDD+5v power supply; Wherein, main power source VDD1+5v is for CPU element 5, VDD1+5V and VCC-5V offer signal amplification rectification circuit 3 simultaneously, VDD2+12V supplies with each operating passing zero IC10 in first, second, third power switching module 7A, 7B, 7C and power switching module, and VDD3+5V offers RS485 communication unit 8;
CPU element 5 is connected with a control panel unit 4 by cable, and control panel unit 4 is for human-computer dialogue and show relevant information; Within described in the utility model minute, compensation type low-voltage intelligent combined reactive power compensator is when online control, can set one for main frame (mailing address is set to zero-address) by control panel unit 4, other are slave (mailing address is arranged to non-zero and is not repeated sequence number); Main frame calculates power distribution information collection as master control equipment, and according to result of calculation and the comparison of control target, slave is sent to capacitor switching order, slave capacitor switching is accepted control by switching cycle mode, to realize among a small circle, connect, avoid each to work independently, dropped into together and dropped into, cut off together and cut off, made power factor on the low side;
CPU element 5 is connected with a RS485 communication unit 8 by cable; Between described in the utility model minute compensation type low-voltage intelligent combined reactive power compensator, can carry out 485 communications by RS485 communication unit 8, realize networking control function; RS485 communication unit 8 can adopt existing techniques in realizing;
CPU element 5 is connected with temperature sensing amplifier unit 9 by cable; Temperature sensing amplifier unit 9, for gathering capacitor temperature, is realized overheat protector to capacitor; Temperature sensing amplifier unit 9 can adopt existing techniques in realizing;
CPU element 5 is amplified rectification circuit 3 by cable and signal and is connected;
Signal amplifies the data that rectification circuit 3 receives signal gathering unit 2;
Described signal gathering unit 2 comprises three voltage transformers 21 and three current transformers 22; Current transformer 22 detects the electric current of three-phase, and voltage transformer 21 detects the voltage of three-phase;
CPU element 5 is connected with output power ratio control switch on-off unit 6 by cable;
Output power ratio control switch on-off unit 6 is connected with first, second, third power switching module 7A, 7B, 7C by splicing ear, in described each power switching module, is equipped with an operating passing zero IC10;
Three power capacitor CAP1, the CAP2 that first, second, third power switching module 7A, 7B, 7C are connected with " star-like ", CAP3 connect.Three power capacitors that power capacitor CAP1, CAP2, CAP3 are the low pressure 0.4KV for compensating.
On the basis of technique scheme, the model of CPU element 5 is STC12C5620AD.CPU element 5 is control core, CPU element 5 adopts the STC12C5620AD single-chip microcomputer of macrocrystalline science and technology, and this single-chip microcomputer can be operated in 1T pattern, than fast 8～12 times of common 51 series monolithic speed, inner integrated 10,8 tunnel ADC and other ancillary equipment, meet product and measure and control requirement.
On the basis of technique scheme, the K1 pin of the first power switching module 7A is connected with the A of three-phase phase line,
The K1 pin of the second power switching module 7B is connected with the B of three-phase phase line,
The K1 pin of the 3rd power switching module 7C is connected with the C of three-phase phase line,
The A1 terminal of three power capacitors that the K2 pin of the first power switching module 7A is connected with " star " connects,
The B1 terminal of three power capacitors that the K2 pin of the second power switching module 7B is connected with " star " connects,
The C1 terminal of three power capacitors that the K2 pin of the 3rd power switching module 7C is connected with " star " connects,
Neutral line N connects the neutral point of three power capacitors." star " of three power capacitors is connected to known technology, can adopt existing techniques in realizing.
On the basis of technique scheme, as shown in Figure 2,4 bottoms, control panel unit are provided with setting key, upwarding key, down Arrow, and middle part is provided with a main LED display box, are provided with the LED light of some demonstration work at present states around main LED display box.
Control panel unit 4 courses of work are as follows:
After electrification reset, main LED display box shows company's Pinyin abbreviation, bright 1 second, and divide afterwards compensation type low-voltage intelligent combined reactive power compensator to enter automatic running status, LED light is bright automatically.
Enter after automatic running status, main LED display box shows successively the value of following parameter and LED light is bright accordingly: capacitor compensation reactive capability (capacity LED light is bright), power factor lower limit (lower limit LED light is bright), switched capacitor time delay (time delay LED light is bright), current transformer ratio (no-load voltage ratio LED light is bright), capacitor overvoltage protection value (overvoltage LED light is bright), capacitor overheat protector temperature value (excess temperature LED light is bright), the mailing address of the machine (address LED light is bright), each parameter display stops 1 second, LED light is extinguished after parameter display, after above-mentioned each parameter display completes, frequency LED light is bright, main LED display box shows mains frequency.Then divide compensation type low-voltage intelligent combined reactive power compensator to enter automatic control state.
Enter after automatic control state, when there is overvoltage, main LED display box shows the magnitude of voltage of overvoltage, and the LED light of overvoltage is simultaneously bright, if any dropping into electric capacity, excise the electric capacity having dropped into, and forbid that capacitor drops into again before line voltage is down to the following 10VAC of overvoltage protection value; When there is excess temperature, main LED display box shows the temperature value of excess temperature, and excess temperature LED light is bright simultaneously, the electric capacity that excision has dropped into, and below capacitor temperature is down to overheat protector value, before 5 ℃, forbid that capacitor drops into again.
At minute compensation type low-voltage intelligent combined reactive power compensator when automatic running status (LED light is bright automatically), press setting key, main LED display box displaying contents switches successively between frequency, three-phase voltage, three-phase current, power factor, and the three-phase (A phase, B phase, C phase LED light) of the three-phase (A phase, B phase, C phase LED light) of the three-phase (A phase, B phase, C phase LED light) of corresponding frequency indicator light, voltage indicator lamp and correspondence, alternator indicator and correspondence, power factor indicator light and correspondence is bright.
At minute compensation type low-voltage intelligent combined reactive power compensator when automatic running status (LED light is bright automatically), press setting key and upwarding key simultaneously, or first press upwarding key and keep again by setting key, divide compensation type low-voltage intelligent combined reactive power compensator to enter the state of setting, press again setting key at capacitor compensation reactive capability, power factor lower limit, switched capacitor time delay, current transformer ratio, capacitor overvoltage protection value, capacitor overheat protector temperature value, between the mailing address of the machine, switch, simultaneously corresponding LED light is bright, pressing upwarding key increases the parameter value of Set For Current parameter, by down Arrow, reduce the parameter value of Set For Current parameter, the new parameter value setting is preserved automatically.Wherein, after having set the mailing address of the machine, need to again by setting key, just return to automatic running status.
At minute compensation type low-voltage intelligent combined reactive power compensator when automatic running status (LED light is bright automatically), press setting key and down Arrow simultaneously, or first press down Arrow and keep again by setting key, divide compensation type low-voltage intelligent combined reactive power compensator to enter manual mode (manually LED light is bright), press upwarding key and drop into electric capacity, LED light Ca, Cb, Cc are bright, press down Arrow excision electric capacity, electric capacity LED light Ca, Cb, Cc go out, and by setting key, return to automatic running status.
At minute compensation type low-voltage intelligent combined reactive power compensator when automatic running status (LED light is bright automatically), press upwarding key and down Arrow simultaneously, or first press down Arrow and keep again by upwarding key, divide compensation type low-voltage intelligent combined reactive power compensator to enter debugging mode (debugging LED light is bright), press upwarding key electric capacity LED light Ca, Cb, Cc are bright, but capacitor is failure to actuate; By down Arrow electric capacity LED light Ca, Cb, Cc, go out, but capacitor is failure to actuate, by setting key, returns to automatic running status.Whether button and display unit that debugging mode is mainly used in testing display circuit board be normal.
The control panel of the hommization directly perceived that above-mentioned control panel unit 4 adopts has the following advantages: displaying contents is directly perceived, main LED display box displaying contents and status indicator LED etc. are mutually corresponding, without rotation, select displaying contents, avoid the defect showing due to LED display box, and mislead operating personnel, occur faulty operation, such as LED screen cannot be distinguished " T " and " J ", very low to operating personnel's requirement, as long as common electrician just can operate, and not necessarily need corresponding detail specifications.
On the basis of technique scheme, temperature sensing amplifier unit 9 comprises a thermistor RT, thermistor RT is a NTC(negative temperature coefficient) device, be subject to variations in temperature, itself resistance also can reduce, thermistor RT connects with divider resistance after dividing potential drop and is input to CPU element 5, after CPU element 5 internal simulations/digital conversion, with the 4 set point contrasts of control panel unit, judge whether excess temperature, whether cut off power capacitor, can on control panel unit 4, inquire about current temperature value simultaneously.
On the basis of technique scheme, the model of current transformer 22 is CT05-1, the signal code of the 0-5A that current transformer 22 produces the distribution three-phase input current by primary current instrument transformer is transformed into 5 receptible current signals of CPU element, after CPU element 5 internal simulations/digital conversion, measure power network current signal; And CPU element 5 and external power system are carried out to electrical isolation;
The model of voltage transformer 21 is PT01-4, voltage transformer 21 is transformed into 5 receptible voltage signals of CPU element by distribution voltage 220V, and CPU element 5 and external power system are carried out to electrical isolation, after CPU element 5 internal simulations/digital conversion, contrast with control panel unit 4 set points, detect whether overvoltage, under-voltage, when overvoltage, cut off power capacitor, when under-voltage, forbid dropping into power capacitor, but allow excision power capacitor, thereby guarantee that power capacitor reliability service can not damage;
Meanwhile, three-phase voltage signal and three-phase current signal contrast, according to the gap at phase angle, calculating reactive power size, when this reactive power surpasses control panel unit 4 set point, drops into power capacitor, carry out reactive power compensation, promote power circuit power supplying efficiency;
Described in the utility model minute compensation type low-voltage intelligent combined reactive power compensator, need three current transformers and three voltage transformers, current transformer 22 is for detection of the electric current of three-phase phase line, voltage transformer 21 is for detection of the voltage of three-phase, by CPU computing, draw current power factor and reactive power later, as current power factor is perception lower than set point, when bright and this phase reactive power of hysteresis LED light is greater than capacitor reactive compensation set point, this corresponding phase power capacitor that is connected, with compensation, improve power factor, by measuring phase angle difference, when electrical network capacitive, leading bright this phase compensates electric capacitor that simultaneously cuts off of LED light.In the utility model, three-phase power capacitor is done " star-like " and is connected, and respectively each is compensated mutually, three current transformers 22 and three voltage transformers 21, after sample of signal, by CPU element 5, calculate, then contrast with control panel unit 4 set points, determine to drop into or cut off.To there being inductive load on same circuit, there is again resistive load, realize meticulousr compensation.
For example, low pressure A electric current is 100A, voltage 0.4kV, and active power 8KW, power factor is brought up to more than 0.96, apparent power:
S=UaIa=220×50=11kVA（1）
Reactive power:
Former power factor:
cosΦ=P/S=0.72（3）
Building-out capacitor:
According to calculating gained, need minute benefit electric capacity of corresponding compensation 5.377KVar more suitable.An intelligence minute benefit capacitor is selected 5KVar phase splitting compensation electric capacity, according to result of calculation, drops into A phase 5KVar phase splitting compensation electric capacity (now electric capacity LED light Ca is bright), can reach good reactive power compensation object.
On the basis of technique scheme, output power ratio control switch on-off unit 6 is controlled by CPU element 5, by controlling first, second, third power switching module 7A, the S2 of 7B, 7C and the level of S4 pin, closed or disconnect each power switching module;
The S1 pin of power switching module is connected with power vd D2+12V with S3 pin,
S1, S2 pin are connected to the coil two ends of the magnetic latching relay J1 being located in power switching module,
S3, S4 pin are connected to the operating passing zero IC10 being located in power switching module,
In power switching module, be also provided with thyristor SCR1 and the SCR2 of reverse parallel connection,
A contact in a pair of normally opened contact of magnetic latching relay J1 connects the anode A utmost point of thyristor SCR1, the negative electrode K utmost point of SCR2, and another contact connects the negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2,
The negative electrode K utmost point of the anode A utmost point of thyristor SCR1, SCR2 is connected to K1 terminal,
The negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2 are connected to K2 terminal,
An output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR1, and another output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR2.
Described S1, S2, S3, S4 pin are all controlled by CPU element 5 by output power ratio control switch on-off unit 6.By CPU, power factor detected and drop to and set to require when following, to drop into power capacitor, when power factor reaches to set, require or during overcompensation, at CPU, control the incision power capacitor that breaks.
Under the course of work of output power ratio control switch on-off unit 6 and power switching module is for example compensated for as with A mutually:
1, when CPU element 5 is through internal calculation, by control panel unit 4 set points, contrast, in the situation that needs drop into A phase power capacitor:
In specific embodiment shown in A, Fig. 1, there are three power switching module 7A, 7B and 7C;
The S3 pin of B, power switching module is connected with power vd D2+12V, and the S3 of power switching module, S4 pin are connected to inner operating passing zero IC10, when alternating voltage zero-crossing, and this operating passing zero IC conducting,
The S1 pin of C, power switching module is connected to VDD2+12V, and the S1 of power switching module, S2 pin are connected to inner magnetic latching relay coil two ends, while obtaining forward voltage, and magnetic latching relay adhesive;
When D, input A phase building-out capacitor, by CPU element 5 output control signals, by output power ratio control switch on-off unit 6, the S2 of power switching module 7A being driven is low level, after 20mS, by CPU element 5 output control signals, by output power ratio control switch on-off unit 6, the S4 of power switching module 7A being driven is low level, after 50ms, the S2 of power switching module 7A is driven for high level again, while realize dropping into like this power capacitor, reduce or prevent the impulse current to electrical network.
The process of cutting off is contrary with above-mentioned input process, by CPU element 5 output control signals, by output power ratio control switch on-off unit 6, the S2 of power switching module 7A being driven is low level, by CPU element 5 output control signals, by output power ratio control switch on-off unit 6, the S4 of power switching module 7A being driven is high level, after 50ms, then the S2 of power switching module 7A is driven as high level.Operating passing zero IC model is MOC3083, considers reliability, can adopt the mode of two MOC3083 series connection as shown in Figure 3 to use.Magnetic latching relay J1 can adopt existing techniques in realizing.
Thyristor SCR1, SCR2 reverse parallel connection, and then in parallel with relay J 1 normally opened contact, thyristor SCR1, SCR2 is controlled by operating passing zero IC, when CPU element drives operating passing zero IC by S3 terminal and S4 terminal, thyristor conducting when supply voltage zero passage, alleviate to greatest extent the surge impact electric current to electrical network, magnetic latching relay J1 is later than operating passing zero IC certain hour and connects, as 20mS, can not be subject to heavy current impact in protection relay contact, extend relay useful life, after magnetic latching relay J1 connects, make thyristor SCR1, SCR2 anode and cathode voltage are zero, from thyristor operation principle: when thyristor anode and cathode voltage are not enough to maintain conducting, thyristor cut-off, deactivate, now no matter whether conducting of operating passing zero IC, thyristor all ends, make thyristor can not generate heat and burn out.
The utility model operation principle is as follows:
By current transformer, heavy current is changed into and the proportional weak voltage signal of electric current, by voltage transformer, high voltage is changed into weak voltage signal; Current signal after conversion, voltage signal are sent into signal and are amplified rectification circuit 3, the digital quantity signal that ADC function analog signal by CPU element 5 changes into, CPU element 5 is calculated the phase difference of two signals, then calculate power factor and reactive power, to judge whether input compensation electric capacity, or cut-out power capacitor, pass through drive circuit, thyristor in driving power module and magnetic latching relay composite switch circuit, realize operating passing zero, avoid the heavy current impact to electrical network, extend the contact endurance of magnetic latching relay.
Specific implementation principle is: process time delay when CPU element 5 detects reactive power to surpass the value of setting, first drive thyristor, make thyristor conducting when voltage zero-cross, realize electrical network non-impact current access power capacitor, through 1-2 wave period, be after 10-20ms, then connect magnetic latching relay, short circuit thyristor two ends, realize a smooth transition, meanwhile, avoid thyristor to switch on for a long time, heating damages.Operating characteristic by thyristor can know, when the pressure drop of thyristor two ends is zero, and thyristor cut-off.The process of rupturing duty module is contrary with input process, first cuts off magnetic latching relay, and after 1-2 cycle is 10-20ms, then current over-zero cuts off thyristor, same realization the assurance magnetic holding contact life-span, the impact of elimination on electrical network impulse current.
Claims (8)
1. a minute compensation type low-voltage intelligent combined reactive power compensator, is characterized in that, comprising:
A supply convertor (1), receives the input of AC380v power supply, and a road VCC-5v, a road VDD+12v, two-way VDD+5v power supply are provided; Wherein, main power source VDD1+5v is for CPU element (5), VDD1+5V and VCC-5V offer signal amplification rectification circuit (3) simultaneously, VDD2+12V supplies with each operating passing zero IC(10 in first, second, third power switching module (7A, 7B, 7C) and first, second, third power switching module), VDD3+5V offers RS485 communication unit (8);
CPU element (5) is connected with a control panel unit (4) by cable, and control panel unit (4) are for human-computer dialogue and show relevant information;
CPU element (5) is connected with a RS485 communication unit (8) by cable;
CPU element (5) is connected with temperature sensing amplifier unit (9) by cable; Temperature sensing amplifier unit (9), for gathering capacitor temperature, is realized overheat protector to capacitor;
CPU element (5) is amplified rectification circuit (3) by cable and signal and is connected;
Signal amplifies the data that rectification circuit (3) receives signal gathering unit (2);
Described signal gathering unit (2) comprises three voltage transformers (21) and three current transformers (22); Current transformer (22) detects the electric current of three-phase, and voltage transformer (21) detects the voltage of three-phase;
CPU element (5) is connected with output power ratio control switch on-off unit (6) by cable;
Output power ratio control switch on-off unit (6) is connected with first, second, third power switching module (7A, 7B, 7C) by splicing ear, in described first, second, third power switching module, is equipped with an operating passing zero IC(10);
Three power capacitor CAP1, the CAP2 that first, second, third power switching module (7A, 7B, 7C) is connected with " star-like ", CAP3 connect, three power capacitors that power capacitor CAP1, CAP2, CAP3 are the low pressure 0.4KV for compensating.
2. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, is characterized in that: the K1 pin of the first power switching module (7A) is connected with the A of three-phase phase line,
The K1 pin of the second power switching module (7B) is connected with the B of three-phase phase line,
The K1 pin of the 3rd power switching module (7C) is connected with the C of three-phase phase line,
The A1 terminal of three power capacitors that the K2 pin of the first power switching module (7A) is connected with " star " connects,
The B1 terminal of three power capacitors that the K2 pin of the second power switching module (7B) is connected with " star " connects,
The C1 terminal of three power capacitors that the K2 pin of the 3rd power switching module (7C) is connected with " star " connects,
Neutral line N connects the neutral point of three power capacitors.
3. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, is characterized in that: the model of CPU element (5) is STC12C5620AD.
4. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, it is characterized in that: bottom, control panel unit (4) is provided with setting key, upwarding key, down Arrow, middle part is provided with a main LED display box, is provided with the LED light of some demonstration work at present states around main LED display box.
5. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, it is characterized in that: temperature sensing amplifier unit (9) comprises a thermistor RT, thermistor RT is a NTC device, with temperature, raise, itself resistance also can reduce, thermistor RT connects with divider resistance after dividing potential drop and is input to CPU element (5), after CPU element (5) internal simulation/digital conversion, contrast with control panel unit (4) set point, judge whether excess temperature, whether cut off power capacitor.
6. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, it is characterized in that: the model of current transformer (22) is CT05-1, the signal code of the 0-5A that current transformer (22) produces the distribution three-phase input current by current transformer is transformed into the receptible current signal of CPU element (5), after CPU element (5) internal simulation/digital conversion, measure power network current signal; And CPU element (5) and external power system are carried out to electrical isolation;
The model of voltage transformer (21) is PT01-4, voltage transformer (21) is transformed into the receptible voltage signal of CPU element (5) by distribution voltage 220V, and CPU element (5) and external power system are carried out to electrical isolation, after CPU element (5) internal simulation/digital conversion, contrast with control panel unit (4) set point, detect whether overvoltage, under-voltage, when overvoltage, cut off power capacitor, when under-voltage, forbid dropping into power capacitor, but allow excision power capacitor, thereby guarantee that power capacitor reliability service can not damage;
Meanwhile, three-phase voltage signal and three-phase current signal contrast, according to the gap at phase angle, calculating reactive power size, when this reactive power surpasses control panel unit (4) set point, drops into power capacitor, carry out reactive power compensation, promote power circuit power supplying efficiency.
7. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, it is characterized in that: output power ratio control switch on-off unit (6) is controlled by CPU element (5), by controlling the S2 of first, second, third power switching module (7A, 7B, 7C) and the level of S4 pin, closed or disconnect each power switching module;
The S1 pin of first, second, third power switching module is connected with power vd D2+12V with S3 pin,
S1, S2 pin are connected to the coil two ends of being located at the magnetic latching relay J1 in first, second, third power switching module,
S3, S4 pin are connected to the operating passing zero IC(10 being located in first, second, third power switching module),
In first, second, third power switching module, be also provided with thyristor SCR1 and the SCR2 of reverse parallel connection,
A contact in a pair of normally opened contact of magnetic latching relay J1 connects the anode A utmost point of thyristor SCR1, the negative electrode K utmost point of SCR2, and another contact connects the negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2,
The negative electrode K utmost point of the anode A utmost point of thyristor SCR1, SCR2 is connected to K1 terminal,
The negative electrode K utmost point of thyristor SCR1, the anode A utmost point of SCR2 are connected to K2 terminal,
An output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR1, and another output control terminal of operating passing zero IC is connected to the gate pole G utmost point of thyristor SCR2.
8. as claimed in claim 1 minute compensation type low-voltage intelligent combined reactive power compensator, is characterized in that: operating passing zero IC(10) model is MOC3083.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010515442.1A CN102157945B (en) | 2010-02-11 | 2010-10-22 | Individual compensation type low-voltage intelligent combined reactive power compensator |
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| CN201020112074.1 | 2010-02-11 | ||
| CN201020112074 | 2010-02-11 | ||
| CN201010515442.1A CN102157945B (en) | 2010-02-11 | 2010-10-22 | Individual compensation type low-voltage intelligent combined reactive power compensator |
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| CN102157945B true CN102157945B (en) | 2014-09-17 |
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| CN2010205717450U Expired - Lifetime CN201829962U (en) | 2010-02-11 | 2010-10-22 | Separate-compensation type low-voltage intelligent combined reactive power compensator |
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| CN102157945B (en) * | 2010-02-11 | 2014-09-17 | 恒一电气有限公司 | Individual compensation type low-voltage intelligent combined reactive power compensator |
| CN103580037A (en) * | 2013-10-25 | 2014-02-12 | 恒一电气有限公司 | Double-switch capacitance compensation device |
| CN106684888A (en) * | 2017-01-20 | 2017-05-17 | 恒电气集团有限公司 | Zero-transition low-voltage intelligent reactive power compensation control device |
| CN106849125A (en) * | 2017-03-21 | 2017-06-13 | 佛山市施诺尔电气有限公司 | A kind of intelligent capacitor compensation device and capacitor switching method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201188544Y (en) * | 2007-11-07 | 2009-01-28 | 重庆海润节能技术有限公司 | Intelligent phase-splitting reactive power compensating circuit |
| CN201247960Y (en) * | 2008-07-11 | 2009-05-27 | 福州大学 | Intelligent reactive compensation control device |
| CN201829962U (en) * | 2010-02-11 | 2011-05-11 | 恒一电气有限公司 | Separate-compensation type low-voltage intelligent combined reactive power compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03222016A (en) * | 1990-01-26 | 1991-10-01 | Nissin Electric Co Ltd | Control system for reactive power compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201188544Y (en) * | 2007-11-07 | 2009-01-28 | 重庆海润节能技术有限公司 | Intelligent phase-splitting reactive power compensating circuit |
| CN201247960Y (en) * | 2008-07-11 | 2009-05-27 | 福州大学 | Intelligent reactive compensation control device |
| CN201829962U (en) * | 2010-02-11 | 2011-05-11 | 恒一电气有限公司 | Separate-compensation type low-voltage intelligent combined reactive power compensator |
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| Title |
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| JP平3-222016A 1991.10.01 |
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| CN102157945A (en) | 2011-08-17 |
| CN201829962U (en) | 2011-05-11 |
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Address after: 325603, Zhejiang City, Yueqing Province North white elephant town Baita Wang Industrial Zone Patentee after: HENGYI ELECTRIC GROUP CO., LTD. Address before: 325603, Zhejiang, Yueqing Province North white elephant town Baita Wang Industrial Zone Heng An Electric Co., Ltd. Patentee before: Hengyi Electrical Co., Ltd. |