CN103595060A - Intelligent capacitor system based on CAN communication and main and slave discriminating method thereof - Google Patents
Intelligent capacitor system based on CAN communication and main and slave discriminating method thereof Download PDFInfo
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- CN103595060A CN103595060A CN201310563851.2A CN201310563851A CN103595060A CN 103595060 A CN103595060 A CN 103595060A CN 201310563851 A CN201310563851 A CN 201310563851A CN 103595060 A CN103595060 A CN 103595060A
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses an intelligent capacitor system based on CAN communication and a main and slave discriminating method thereof. The system comprises N intelligent capacitors, all the intelligent capacitors are connected through CAN buses, three-phase voltages are input into a voltage transducer in each intelligent capacitor respectively, and three-phase currents are input into each intelligent capacitor respectively through a current transducer. The N intelligent capacitors comprise a main intelligent capacitor and (N-1) slave intelligent capacitors, and the N is a natural number. The intelligent capacitors are used for replacing a capacitor, a combination switch and a controller in an original reactive power compensation device, the wiring of the intelligent capacitors are made to be convenient and attractive, and fault points are reduced. All the intelligent capacitors communicate through the CAN buses, communication wait and conflict are reduced, and the reliability of communication is guaranteed. Each intelligent capacitor can complete all the functions of the combination switch and the controller independently, fault judgment on a power grid can be more accurate, and any abnormal intelligent capacitor cannot influence the working of other intelligent capacitors.
Description
Technical field
The present invention relates to reactive-load compensation equipment field, relate in particular to a kind of Intelligent capacitor system and principal and subordinate's method of discrimination thereof based on CAN communication.
Background technology
Reactive power compensation can improve the power factor of electrical network in electric power system, reduces the loss of supply transformer and conveying circuit, and improves power supplying efficiency and improve power supply environment.So reactive power compensation device in a very important status, therefore, is reasonably selected compensation arrangement in power supply system, can accomplish to reduce to greatest extent the loss of network, power grid quality is improved.
As shown in Figure 1, existing low-voltage reactive compensator capable mainly controls by control signal the switching that combination switch is realized electric capacity by distribution transformer terminals or idle compensating control.The mode link of this reactive power compensation is many and cost is high.If distribution transformer terminals or controller break down, whole system is by cisco unity malfunction.
Summary of the invention
The technical problem to be solved in the present invention is, many and cost is high for the link of the reactive power compensator of prior art, and the defect that cannot work while breaking down, a kind of simple, reliable communications and fault verification Intelligent capacitor system and the principal and subordinate's method of discrimination thereof based on CAN communication is accurately provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of intelligent capacitor system based on CAN communication is provided, comprise N Intelligent capacitor, between each Intelligent capacitor, by CAN bus, connect, three-phase voltage is inputted respectively the voltage transmitter in each Intelligent capacitor, and three-phase current is inputted respectively each Intelligent capacitor by current transducer; Wherein, N Intelligent capacitor comprises a main Intelligent capacitor and (N-1) individual from Intelligent capacitor, and N is natural number;
Described current transducer, for being converted to the first small signal by described three-phase current;
Described voltage transmitter, for being converted to the second small signal by described three-phase voltage;
Each Intelligent capacitor, be used for gathering the first small signal and the second small signal, according to the first gathered small signal and the second small signal, calculate active power, reactive power and power factor, and judge whether to need switching capacitance according to active power, reactive power and power factor, each is sent to main Intelligent capacitor by the judged result of self by CAN bus from Intelligent capacitor, and main Intelligent capacitor sends switching instruction according to the judged result of self and each judged result from Intelligent capacitor self;
Preferably, each Intelligent capacitor comprises the discharge circuit that has the CPU of A/D converter, is connected with described voltage transmitter with CPU respectively and the CAN being connected with CPU respectively isolates transceiver and switching assembly, wherein:
Described discharge circuit, for amplifying described the first small signal and described the second small signal respectively;
Described CAN isolation transceiver, for accessing outside CAN network;
Whether described switching assembly, need switching for controlling Intelligent capacitor.
Preferably, described switching assembly comprises the zero passage optocoupler being connected with described CPU respectively, drive circuit of magnetic latching relay and this schmitt trigger, the controllable silicon being connected with described zero passage optocoupler, the magnetic latching relay being connected with described drive circuit of magnetic latching relay, the linear optical coupling being connected with described this schmitt trigger with described controllable silicon respectively, described magnetic latching relay and described controllable silicon are connected in parallel, wherein, CPU drives zero passage optocoupler to control silicon controlled switching, CPU drives the switching of magnetic latching relay by drive circuit of magnetic latching relay, linear optical coupling gathers the alternating voltage at controllable silicon two ends, and this alternating voltage is formed to square wave after by Schmidt trigger shaping be sent to CPU, CPU judges according to this square wave whether this Intelligent capacitor carries out switching.
Preferably, described each Intelligent capacitor also comprises the display being connected with CPU, wherein:
Described display, for carrying out parameter setting by button operation and real time data is checked.
Preferably, described display is liquid crystal display.
Preferably, the range of voltage values of described the first small signal and described the second small signal is 0-2.5V.
Preferably, described CPU is specially chip STM32F103.
Preferably, described A/D converter is 12 A/D converters.
The present invention also provides a kind of principal and subordinate's method of discrimination of the Intelligent capacitor system based on CAN communication, and the described Intelligent capacitor system based on CAN communication is the above-mentioned Intelligent capacitor system based on CAN communication, and described principal and subordinate's method of discrimination comprises the following steps:
S1. after powering on, each Intelligent capacitor all sends capacitance, CAN address, the common benefit or minute benefit parameter that broadcasting packet obtains other Intelligent capacitor;
If S2. do not receive the broadcasting packet that main Intelligent capacitor sends in Preset Time, judge that this main Intelligent capacitor breaks down;
If S3. receive the broadcasting packet that other send from Intelligent capacitor, at those, from Intelligent capacitor, select CAN address minimum in current C AN network from Intelligent capacitor;
S4. CAN address minimum in current C AN network substituted to original main Intelligent capacitor from Intelligent capacitor.
Preferably, above-mentioned each from Intelligent capacitor, all do not carry out switching operation.
Implement technical scheme of the present invention, there is following beneficial effect: Intelligent capacitor is substituted to electric capacity, combination switch and the controller in original reactive power compensator, make the easy-to-connect of Intelligent capacitor and attractive in appearance, reduced fault point; Between each Intelligent capacitor, by CAN bus communication, reduce communication and waited for and conflict, guaranteed the reliability of communication; Each capacitor all can independently complete the repertoire of combination switch and controller, more accurate for the fault verification of electrical network, and the work of other Intelligent capacitor that extremely all can not affect of any one Intelligent capacitor.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of prior art low-voltage reactive compensator capable;
Fig. 2 is the connection diagram that the present invention is based on the Intelligent capacitor system of CAN communication;
Fig. 3 is the internal structure schematic diagram of the single Intelligent capacitor of the present invention;
Fig. 4 is the circuit diagram of discharge circuit of the present invention;
Fig. 5 is the circuit diagram of drive circuit of magnetic latching relay of the present invention;
Fig. 6 is the flow chart of principal and subordinate's method of discrimination that the present invention is based on the Intelligent capacitor system of CAN communication.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 2, Fig. 2 is the connection diagram that the present invention is based on the Intelligent capacitor system of CAN communication, as shown in Figure 2, between each Intelligent capacitor, by CAN bus, connect, three-phase voltage directly accesses the voltage transmitter in each Intelligent capacitor, and three-phase current accesses each Intelligent capacitor by current transducer; In the CAN network communicating based on CAN bus, the Intelligent capacitor of CAN address minimum is main Intelligent capacitor, and in the present embodiment, N Intelligent capacitor comprises a main Intelligent capacitor and (N-1) individual from Intelligent capacitor, and N is natural number.
Described voltage transmitter, for described three-phase voltage is converted to the second small signal, the range of voltage values of the second small signal is 0-2.5V.
Current transducer, for described three-phase current is converted to the first small signal, in the present embodiment, the range of voltage values of the first small signal is 0-2.5V.
Each Intelligent capacitor, be used for gathering the first small signal and the second small signal, according to the first gathered small signal and the second small signal, calculate active power, reactive power and power factor, and judge whether to need switching capacitance according to active power, reactive power and power factor, each is sent to main Intelligent capacitor by the judged result of self by CAN bus from Intelligent capacitor, and main Intelligent capacitor sends switching instruction according to the judged result of self and each judged result from Intelligent capacitor self.It should be noted that if the parameter that the reactive power of calculating and power factor all set over Intelligent capacitor self drops into electric capacity, if the active power of calculating or power factor surpass the parameter that Intelligent capacitor self sets, excise electric capacity.
Incorporated by reference to consulting Fig. 3, Fig. 3 is the internal structure schematic diagram of the single Intelligent capacitor of the present invention, as shown in Figure 3, each Intelligent capacitor comprises discharge circuit 202, CAN isolation transceiver 203, switching assembly 205 and the display 206 that has the CPU204 of A/D converter, is connected with CPU204 respectively and the voltage transmitter 201 being connected with described discharge circuit 202, introduces the effect of various piece below:
Described voltage transmitter 201, for described three-phase voltage is converted to the second small signal, the range of voltage values of the second small signal is 0-2.5V.
Described discharge circuit 202, for amplifying described the first small signal and described the second small signal respectively.
Described CAN isolation transceiver 203, for accessing outside CAN network.
Described CPU204 is specially chip STM32F103.Described A/D converter is 12 A/D converters.It should be noted that this CPU204 carries two 12 A/D, totally 16 passages, generally, 10 A/D precision that 12 A/D adopt single-chip microcomputer to carry than miscellaneous equipment have improved a lot, have met the required precision gathering, and than employing, independent A/D has reduced again cost; Two A/D converters can gather voltage and current simultaneously, and the angle that switches the current/voltage gathering than multichannel is more accurate, have guaranteed the correctness of power factor.
Described display 206, for carrying out parameter setting by button operation and real time data is checked, in the present embodiment, described display 206 is liquid crystal display.
Whether described switching assembly 205, need switching for controlling Intelligent capacitor.
As shown in Figure 3, described switching assembly 205 comprises the zero passage optocoupler being connected with described CPU204 respectively, drive circuit of magnetic latching relay and this schmitt trigger, the controllable silicon being connected with described zero passage optocoupler, the magnetic latching relay being connected with described drive circuit of magnetic latching relay, the linear optical coupling being connected with described this schmitt trigger with described controllable silicon respectively, described magnetic latching relay and described controllable silicon are connected in parallel, what should explain is, CPU drives zero passage optocoupler to control silicon controlled switching, guarantee that controllable silicon drops at voltage over zero, current zero-crossing point excision, make whole switching no-flashy-flow, magnetic latching relay and controllable silicon are in parallel, CPU drives the switching of magnetic latching relay by drive circuit of magnetic latching relay, that is to say, after dropping into, drops into controllable silicon magnetic latching relay, controllable silicon guarantees to drop into point for voltage over zero, because silicon controlled heating is large, controllable silicon drops into magnetic latching relay again and makes to drop into loop and realize zero-power after dropping into, when excision, first excise magnetic latching relay and excise again controllable silicon, because silicon controlled current over-zero excision characteristic makes to excise at current zero-crossing point.Linear optical coupling gathers the alternating voltage at controllable silicon two ends, and this alternating voltage is formed to square wave after by Schmidt trigger shaping is sent to CPU, and CPU judges according to this square wave whether this Intelligent capacitor carries out switching.
The physical circuit of discharge circuit as shown in Figure 4, discharge circuit specifically comprises operational amplifier U8B, operational amplifier U9A, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 and resistance R 6, wherein: one end of the in-phase input end difference contact resistance R2 of operational amplifier U8B and one end of resistance R 1, the other end of resistance R 2 connects 3.3V voltage, the other end ground connection of resistance R 1, the inverting input of operational amplifier U8B is connected to the output of operational amplifier U8B, the output of operational amplifier U8B is connected to the in-phase input end of operational amplifier U9A through resistance R 6, voltage U A-1 is connected to the in-phase input end of operational amplifier U9A through resistance R 3, the inverting input of operational amplifier U9A is connected with one end of resistance R 5 with one end of resistance R 4 respectively, the other end ground connection of resistance R 4, the other end of resistance R 5 is connected to the output of operational amplifier U9A.
The physical circuit of drive circuit of magnetic latching relay as shown in Figure 5, drive circuit of magnetic latching relay specifically comprises triode Q7, triode Q8, triode Q9, triode Q10, diode D12, diode D13, diode D14 and diode D15, wherein: the collector electrode of triode Q7 connects 12V voltage, the base stage of triode Q7 is connected with the base stage of triode Q8, the emitter of triode Q7 respectively with the anode of diode D12, the emitter of the negative electrode of diode D13 and triode Q8 connects, the negative electrode of diode D12 connects 12V voltage, the plus earth of diode D13, the grounded collector of triode Q8, the collector electrode of triode Q9 connects 12V voltage, the base stage of triode Q9 is connected with the base stage of triode Q10, the emitter of triode Q9 respectively with the anode of diode D14, the emitter of the negative electrode of diode D15 and triode Q10 connects, the negative electrode of diode D14 connects 12V voltage, the plus earth of diode D15, the grounded collector of triode Q10.
Refer to Fig. 6, Fig. 6 is the flow chart of principal and subordinate's method of discrimination that the present invention is based on the Intelligent capacitor system of CAN communication, and as shown in Figure 6, described principal and subordinate's method of discrimination comprises the following steps:
In step S1, after powering on, each Intelligent capacitor all sends capacitance, CAN address, the common benefit or minute benefit parameter that broadcasting packet obtains other Intelligent capacitor.
In step S2, if do not receive the broadcasting packet that main Intelligent capacitor sends in Preset Time, judge that this main Intelligent capacitor breaks down.Should be noted that, in the present embodiment, Preset Time is 10 seconds, generally, main Intelligent capacitor sent broadcasting packet every one second, to obtain other capacitances from Intelligent capacitor, CAN address, to be total to and to mend or minute benefit parameter, if do not receive the broadcasting packet that main Intelligent capacitor sends in 10 seconds, judge that this main Intelligent capacitor breaks down.
In step S3, if receive the broadcasting packet that other send from Intelligent capacitor, at those, from Intelligent capacitor, select CAN address minimum in current C AN network from Intelligent capacitor.In the present embodiment, each does not all carry out switching operation from Intelligent capacitor, only has main Intelligent capacitor to carry out switching operation.
In step S4, CAN address minimum in current C AN network substituted to original main Intelligent capacitor from Intelligent capacitor, should be noted that, in other embodiments, can choose any one according to user's request and substitute main Intelligent capacitor from Intelligent capacitor, in the present embodiment, by CAN address minimum in current C AN network from Intelligent capacitor, to substitute original main Intelligent capacitor be to establish new main Intelligent capacitor for convenient, do not repeat them here.
One of ordinary skill in the art will appreciate that all or part of step realizing in the various embodiments described above method is to come the hardware that instruction is relevant to complete by program, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
Compared to prior art, Intelligent capacitor is substituted to electric capacity, combination switch and the controller in original reactive power compensator, make the easy-to-connect of Intelligent capacitor and attractive in appearance, reduced fault point; Between each Intelligent capacitor, by CAN bus communication, reduce communication and waited for and conflict, guaranteed the reliability of communication; Each capacitor all can independently complete the repertoire of combination switch and controller, more accurate for the fault verification of electrical network, and the work of other Intelligent capacitor that extremely all can not affect of any one Intelligent capacitor.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (10)
1. the Intelligent capacitor system based on CAN communication, it is characterized in that, comprise N Intelligent capacitor, between each Intelligent capacitor, by CAN bus, connect, three-phase voltage is inputted respectively the voltage transmitter in each Intelligent capacitor, and three-phase current is inputted respectively each Intelligent capacitor by current transducer; Wherein, N Intelligent capacitor comprises a main Intelligent capacitor and (N-1) individual from Intelligent capacitor, and N is natural number;
Described current transducer, for being converted to the first small signal by described three-phase current;
Described voltage transmitter, for being converted to the second small signal by described three-phase voltage;
Each Intelligent capacitor, be used for gathering the first small signal and the second small signal, according to the first gathered small signal and the second small signal, calculate active power, reactive power and power factor, and judge whether to need switching capacitance according to active power, reactive power and power factor, each is sent to main Intelligent capacitor by the judged result of self by CAN bus from Intelligent capacitor, and main Intelligent capacitor sends switching instruction according to the judged result of self and each judged result from Intelligent capacitor self;
Intelligent capacitor system based on CAN communication according to claim 1, it is characterized in that, each Intelligent capacitor comprises the discharge circuit that has the CPU of A/D converter, is connected with described voltage transmitter with CPU respectively and the CAN being connected with CPU respectively isolates transceiver and switching assembly, wherein:
Described discharge circuit, for amplifying described the first small signal and described the second small signal respectively;
Described CAN isolation transceiver, for accessing outside CAN network;
Whether described switching assembly, need switching for controlling Intelligent capacitor.
2. the Intelligent capacitor system based on CAN communication according to claim 2, it is characterized in that, described switching assembly comprises the zero passage optocoupler being connected with described CPU respectively, drive circuit of magnetic latching relay and this schmitt trigger, the controllable silicon being connected with described zero passage optocoupler, the magnetic latching relay being connected with described drive circuit of magnetic latching relay, the linear optical coupling being connected with described this schmitt trigger with described controllable silicon respectively, described magnetic latching relay and described controllable silicon are connected in parallel, wherein, CPU drives zero passage optocoupler to control silicon controlled switching, CPU drives the switching of magnetic latching relay by drive circuit of magnetic latching relay, linear optical coupling gathers the alternating voltage at controllable silicon two ends, and this alternating voltage is formed to square wave after by Schmidt trigger shaping be sent to CPU, CPU judges according to this square wave whether this Intelligent capacitor carries out switching.
3. the Intelligent capacitor system based on CAN communication according to claim 3, is characterized in that, described each Intelligent capacitor also comprises the display being connected with CPU, wherein:
Described display, for carrying out parameter setting by button operation and real time data is checked.
4. the Intelligent capacitor system based on CAN communication according to claim 4, is characterized in that, described display is liquid crystal display.
5. the Intelligent capacitor system based on CAN communication according to claim 2, is characterized in that, the range of voltage values of described the first small signal and described the second small signal is 0-2.5V.
6. the Intelligent capacitor system based on CAN communication according to claim 4, is characterized in that, described CPU is specially chip STM32F103.
7. the Intelligent capacitor system based on CAN communication according to claim 2, is characterized in that, described A/D converter is 12 A/D converters.
8. principal and subordinate's method of discrimination of the Intelligent capacitor system based on CAN communication, it is characterized in that, the described Intelligent capacitor system based on CAN communication is the Intelligent capacitor system based on CAN communication described in above-mentioned 1-8 any one, and described principal and subordinate's method of discrimination comprises the following steps:
S1. after powering on, each Intelligent capacitor all sends capacitance, CAN address, the common benefit or minute benefit parameter that broadcasting packet obtains other Intelligent capacitor;
If S2. do not receive the broadcasting packet that main Intelligent capacitor sends in Preset Time, judge that this main Intelligent capacitor breaks down;
If S3. receive the broadcasting packet that other send from Intelligent capacitor, at those, from Intelligent capacitor, select CAN address minimum in current C AN network from Intelligent capacitor.
9.S4. substitutes original main Intelligent capacitor by CAN address minimum in current C AN network from Intelligent capacitor.
10. principal and subordinate's method of discrimination of the Intelligent capacitor system based on CAN communication according to claim 9, is characterized in that, above-mentioned each from Intelligent capacitor, all do not carry out switching operation.
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Cited By (7)
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| CN104201702A (en) * | 2014-07-11 | 2014-12-10 | 北海市深蓝科技发展有限责任公司 | Device for active power balance adjustment and reactive power compensation |
| CN105098978A (en) * | 2014-12-19 | 2015-11-25 | 华北电力大学 | Intelligent monitor used for intelligent capacitor group |
| CN105244897A (en) * | 2014-07-11 | 2016-01-13 | 北海市深蓝科技发展有限责任公司 | Active power balance adjustment and reactive compensation method and device |
| CN105322557A (en) * | 2014-07-11 | 2016-02-10 | 北海市深蓝科技发展有限责任公司 | Active power balance adjustment and reactive compensation method |
| CN106300374A (en) * | 2015-05-14 | 2017-01-04 | 南京南瑞继保电气有限公司 | Reactive power coordinates the method and system controlled |
| CN109378964A (en) * | 2018-09-29 | 2019-02-22 | 石狮市酷瑞电气有限责任公司 | A kind of frequency converter filter capacitor capacity control system |
| CN109936206A (en) * | 2019-05-05 | 2019-06-25 | 深圳市阿达视高新技术有限公司 | Super capacitor balancing circuitry and vehicle electronic device |
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| CN104201702A (en) * | 2014-07-11 | 2014-12-10 | 北海市深蓝科技发展有限责任公司 | Device for active power balance adjustment and reactive power compensation |
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| CN105098978A (en) * | 2014-12-19 | 2015-11-25 | 华北电力大学 | Intelligent monitor used for intelligent capacitor group |
| CN105098978B (en) * | 2014-12-19 | 2017-10-13 | 华北电力大学 | Intelligent capacitor group intelligent monitor |
| CN106300374A (en) * | 2015-05-14 | 2017-01-04 | 南京南瑞继保电气有限公司 | Reactive power coordinates the method and system controlled |
| CN109378964A (en) * | 2018-09-29 | 2019-02-22 | 石狮市酷瑞电气有限责任公司 | A kind of frequency converter filter capacitor capacity control system |
| CN109936206A (en) * | 2019-05-05 | 2019-06-25 | 深圳市阿达视高新技术有限公司 | Super capacitor balancing circuitry and vehicle electronic device |
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Application publication date: 20140219 |