CN103812496A - Hybrid optical direct-current measuring system on-site converter - Google Patents
Hybrid optical direct-current measuring system on-site converter Download PDFInfo
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- CN103812496A CN103812496A CN201410039622.5A CN201410039622A CN103812496A CN 103812496 A CN103812496 A CN 103812496A CN 201410039622 A CN201410039622 A CN 201410039622A CN 103812496 A CN103812496 A CN 103812496A
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Abstract
The invention discloses a hybrid optical direct-current measuring system on-site converter which comprises an optical current energy converter, an electric energy and communication control signal separation circuit, an isolation circuit, a DC-DC (direct-current to direct-current) conversion circuit, a clock extraction module, a low-voltage judgment module, an analog sampling module, an AD (analog-digital) conversion module, a CPLD (complex programmable logic device) module and a laser diode. The optical current energy converter converts laser into electric energy, the electric energy is separated by the electric energy and communication control signal separation circuit, electric energy outputted by one path is converted into working voltage of the on-site converter by the DC-DC conversion circuit after passing the isolation circuit, communication control signals outputted by one path are processed by a clock signal extraction circuit to output clock signals, low-voltage signals outputted by one path are compared and judged by the low-voltage judgment module to output low-voltage marks, the analog quantity of a low-voltage side of a mutual inductor is sampled by the analog sampling module and converted by the AD conversion module to output a digital quantity, and the CPLD module synchronizes AD conversion and transmits the data by the laser diode. The on-site converter is low in power consumption and cost and high in precision and reliability, and realizes seamless joint with an existing system.
Description
Technical field
The present invention relates to a kind of Hybrid Optic DC Measurement System converter on the spot.
Background technology
At present; primary equipment, conversion equipment, the protection system core board of a lot of grid company Hybrid Optic DC Measurement System all adopts the device of Siemens; wherein higher for carrying out the OPTODYN of the converter on the spot fault frequency of occurrences of opto-electronic conversion; cause measured deviation larger; even cannot proper communication, affect stability and the reliability of whole system operation.Along with the release of the new platform of Siemens and equipment, the former factory of old equipment producing for its design no longer provides maintenance, and unit replacement is only provided.Due to this component price costliness, cause electric power system maintenance, maintenance cost to increase sharply.Meanwhile, owing to lacking follow-up technical support and plant maintenance, the safety detection of system and stable operation also become potential problem.For this present situation, be necessary to explore and develop a kind of low-power consumption, high accuracy, high reliability, low cost, Hybrid Optic DC Measurement System converter on the spot with existing system slitless connection.
Summary of the invention
The object of this invention is to provide a kind of low-power consumption, high accuracy, high reliability, low cost, Hybrid Optic DC Measurement System converter on the spot with existing system slitless connection.
The present invention adopts following technical scheme to solve the problems of the technologies described above:
Hybrid Optic DC Measurement System is converter on the spot, it connects between instrument transformer low-pressure side and ground protective device, it is characterized in that, comprise photoelectric current transducer, electric flux and Control on Communication demultiplexing circuit, buffer circuit, DC-DC change-over circuit, Clock Extraction module, low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Photoelectric current transducer receives the laser signal that the laser energy supply platform of ground protective device sends and is added on the Control on Communication signal on laser signal and is converted to electric flux and after the Control on Communication signal on electric flux, outputs to electric flux and Control on Communication demultiplexing circuit in addition;
The electric flux of electric flux and Control on Communication demultiplexing circuit reception input and in addition the Control on Communication signal on electric flux carry out separating treatment Hou Fen tri-tunnels outputs, one tunnel output electric energy is to buffer circuit, one road output communication control signal is to clock signal extraction module, and a road output LOW voltage signal is to low-voltage determination module;
Buffer circuit, receives the electric flux that electric flux and Control on Communication demultiplexing circuit are exported, and by DC-DC change-over circuit and the isolation of photoelectric current transducer, guarantees that DC-DC change-over circuit output voltage is interference-free, and this buffer circuit output electric flux is to DC-DC change-over circuit;
DC-DC change-over circuit, receive the electric flux of buffer circuit output, and outputing to respectively low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode after being converted to stable voltage, this voltage is as the working power of low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Clock Extraction module, receives Control on Communication signal Shape correction that electric flux and Control on Communication demultiplexing circuit are exported, and clock signal is to CPLD module, as the synchronous clock source of CPLD module controls AD translation data and transmission data;
Low-voltage determination module, receive the low voltage signal of electric flux and the output of Control on Communication demultiplexing circuit, and compare judgement with the default low-voltage threshold value of this module, produce low-voltage flag and output to CPLD module, send to laser diode by CPLD module, deliver to ground protective device by laser diode by optical fiber transmission, adjust in real time the power of the laser signal of the generating laser output in laser energy supply platform;
Analog sampling module is amplified, samples, is processed the analog quantity of instrument transformer low-pressure side and exports sampled value to AD modular converter;
AD modular converter receives the sampled value of analog sampling module output, and is converted to digital quantity, outputs to CPLD module;
The digital quantity of the clock signal of CPLD module receive clock extraction module output, the low-voltage flag of low-voltage determination module output, the output of AD modular converter, this clock signal is as the synchronised clock of CPLD module controls AD translation data and transmission data, under this synchronised clock drives, the synchronous AD translation data of CPLD module and the digital quantity obtaining and low-voltage flag are encoded, and send to ground protective device after being converted to light signal by laser diode;
Laser diode receives the code signal of CPLD module output and changes light signal into; arrive ground protective device by Optical Fiber Transmission; protective device provides the operation information of instrument transformer low-pressure side earthward, and laser energy supply platform is adjusted the power of the laser signal of generating laser output in this platform in real time according to the low-voltage flag of laser diode feedback simultaneously.
Described electric flux and Control on Communication demultiplexing circuit are made up of magnetic bead LB1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, diode D1, after being connected with magnetic bead LB1 one end, resistance R 1 one end connects the output of photoelectric current transducer, resistance R 1 other end is connected with resistance R 2 one end, resistance R 2 other end ground connection, Control on Communication signal is from resistance R 1 and resistance R 2 junction outputs; The magnetic bead LB1 other end is connected with the positive pole of diode D1, and electric energy is from the negative pole output of diode D1; After capacitor C 1 and capacitor C 2 parallel connections, one end connects the negative pole of diode D1, other end ground connection; Resistance R 3 one end connect diode D1 negative pole, and the other end is connected with resistance R 4, resistance R 4 other end ground connection, and low voltage signal is from resistance R 3 and resistance R 4 junction outputs.
Described DC-DC change-over circuit adopts LTC3405A chip.
The default low-voltage threshold value of described low-voltage determination module is 3.3V.
Described analog sampling module, comprise operational amplifier A, resistance R 1, resistance R 2, resistance R 3, resistance R _ f, operational amplifier A in-phase input end connects reference voltage, instrument transformer low-pressure side output analog quantity one end is connected with resistance R 1 one end, and resistance R 1 other end is connected with the inverting input of operational amplifier A; After resistance R 2, resistance R 3, resistance R _ f three's parallel connection, one end is connected with operational amplifier A inverting input, and the other end is connected with operational amplifier A output; Operational amplifier A output output sampled value.
Described AD modular converter adopts the ADC chip of the sixteen bit precision of low-power consumption.
Described CPLD module adopts programmable logic device XC2C128-7VQG100l.
Beneficial effect of the present invention is:
1, this on the spot transducer be positioned at Hybrid Optic DC Measurement System hot side; it can be in time, effectively, accurately monitor optical current transducer output situation and feed back to the laser energy supply platform of ground protection system; adjust in real time the power of the Laser emission device Output of laser of laser energy supply platform; make the generating laser effectively under work, be controlled in lower power output state in system, extended the useful life of the photoelectric current transducer of converter and the generating laser of laser energy supply platform on the spot.
2, this on the spot transducer be positioned at Hybrid Optic DC Measurement System hot side, the laser energy that it receives photoelectric current energy transducer is converted to electric energy, for this on the spot transducer itself stable working power is provided, realize non-transformer input, without battery-powered, low in energy consumption, energy conversion efficiency is high.
3, the AD converter part precision that the present invention selects can reach 0.2%, meets the required precision of Hybrid Optic DC Measurement System, realizes the slitless connection with existing Hybrid Optic DC Measurement System.
4, this on the spot transducer adopt power consumption lower electronic devices and components, all consider Low ESR design when circuit design simultaneously, there is the feature of low-power consumption.
5, this transducer is all controlled to producing from component purchase on the spot, cost is lower, makes system possess maintainability, has also compressed maintenance cost simultaneously.
Accompanying drawing explanation
Fig. 1 is the Hybrid Optic DC Measurement System of the present invention structural representation of converter on the spot.
Fig. 2 is Hybrid Optic DC Measurement System of the present invention electric flux and the Control on Communication demultiplexing circuit circuit theory diagrams of converter on the spot.
Fig. 3 is the Hybrid Optic DC Measurement System of the present invention analog sampling modular circuit schematic diagram of converter on the spot.
Embodiment
Below in conjunction with Fig. 1, Fig. 2, Fig. 3, the present invention is described in detail.
As shown in Figure 1, Hybrid Optic DC Measurement System is converter on the spot, it connects between instrument transformer low-pressure side and ground protective device, it is characterized in that, comprise photoelectric current transducer, electric flux and Control on Communication demultiplexing circuit, buffer circuit, DC-DC change-over circuit, Clock Extraction module, low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Photoelectric current transducer receives the laser signal that the laser energy supply platform of ground protective device sends and is added on the Control on Communication signal on laser signal and is converted to electric flux and after the Control on Communication signal on electric flux, outputs to electric flux and Control on Communication demultiplexing circuit in addition;
The electric flux of electric flux and Control on Communication demultiplexing circuit reception input and in addition the Control on Communication signal on electric flux carry out separating treatment Hou Fen tri-tunnels outputs, one tunnel output electric energy is to buffer circuit, one road output communication control signal is to clock signal extraction module, and a road output LOW voltage signal is to low-voltage determination module;
Buffer circuit, receives the electric flux that electric flux and Control on Communication demultiplexing circuit are exported, and by DC-DC change-over circuit and the isolation of photoelectric current transducer, guarantees that DC-DC change-over circuit output voltage is interference-free, and this buffer circuit output electric flux is to DC-DC change-over circuit;
DC-DC change-over circuit, receive the electric flux of buffer circuit output, and outputing to respectively low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode after being converted to stable voltage, this voltage is as the working power of low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Clock Extraction module, receives Control on Communication signal Shape correction that electric flux and Control on Communication demultiplexing circuit are exported, and clock signal is to CPLD module, as the synchronous clock source of CPLD module controls AD translation data and transmission data;
Low-voltage determination module, receive the low voltage signal of electric flux and the output of Control on Communication demultiplexing circuit, and compare judgement with the default low-voltage threshold value of this module, produce low-voltage flag and output to CPLD module, send to laser diode by CPLD module, deliver to ground protective device by laser diode by optical fiber transmission, adjust in real time the power of the laser signal of the generating laser output in laser energy supply platform;
Analog sampling module is amplified, samples, is processed the analog quantity of instrument transformer low-pressure side and exports sampled value to AD modular converter;
AD modular converter receives the sampled value of analog sampling module output, and is converted to digital quantity, outputs to CPLD module;
The digital quantity of the clock signal of CPLD module receive clock extraction module output, the low-voltage flag of low-voltage determination module output, the output of AD modular converter, this clock signal is as the synchronised clock of CPLD module controls AD translation data and transmission data, under this synchronised clock drives, the synchronous AD translation data of CPLD module and the digital quantity obtaining and low-voltage flag are encoded, and send to ground protective device after being converted to light signal by laser diode;
Laser diode receives the code signal of CPLD module output and changes light signal into; arrive ground protective device by Optical Fiber Transmission; protective device provides the operation information of instrument transformer low-pressure side earthward, and laser energy supply platform is adjusted the power of the laser signal of generating laser output in this platform in real time according to the low-voltage flag of laser diode feedback simultaneously.
As shown in Figure 2, described electric flux and Control on Communication demultiplexing circuit are made up of magnetic bead LB1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, diode D1, after being connected with magnetic bead LB1 one end, resistance R 1 one end connects the output of photoelectric current transducer, resistance R 1 other end is connected with resistance R 2 one end, resistance R 2 other end ground connection, Control on Communication signal is from resistance R 1 and resistance R 2 junction outputs; The magnetic bead LB1 other end is connected with the positive pole of diode D1, and electric energy is from the negative pole output of diode D1; After capacitor C 1 and capacitor C 2 parallel connections, one end connects the negative pole of diode D1, other end ground connection; Resistance R 3 one end connect diode D1 negative pole, and the other end is connected with resistance R 4, resistance R 4 other end ground connection, and low voltage signal is from resistance R 3 and resistance R 4 junction outputs.
Described DC-DC change-over circuit adopts LTC3405A chip.
The default low-voltage threshold value of described low-voltage determination module is 3.3V.
As shown in Figure 3, described analog sampling module, comprise operational amplifier A, resistance R 1, resistance R 2, resistance R 3, resistance R _ f, operational amplifier A in-phase input end connects reference voltage, instrument transformer low-pressure side output analog quantity one end is connected with resistance R 1 one end, and resistance R 1 other end is connected with the inverting input of operational amplifier A; After resistance R 2, resistance R 3, resistance R _ f three's parallel connection, one end is connected with operational amplifier A inverting input, and the other end is connected with operational amplifier A output; Operational amplifier A output output sampled value.
Described AD modular converter adopts the ADC chip of the sixteen bit precision of low-power consumption.
Described CPLD module adopts programmable logic device XC2C128-7VQG100l.
The workflow of CPLD module is as described below:
1. the synchronous clock source providing by Clock Extraction module, determines the beginning of an AD change-over period, controls AD translation data, obtains the data analog-to-digital conversion from AD modular converter data output end.
2. under the driving of synchronised clock, according to serial code mode, the low-voltage flag of the data of AD modular converter output and the output of low-voltage determination module is sent to ground protective device.
3. the order of going round and beginning again repeats 1 and 2.
As can be seen from Figure 1; Power supply of the present invention comes from DC-DC; DC-DC output voltage depends on the continuous luminous energy supply of photoelectric current transducer; and the laser energy supply platform proper communication of this device and ground protective device is depended in the continuous luminous energy supply of photoelectric current transducer; the normal luminous energy of communicating by letter continues to offer photoelectric current transducer; photoelectric current transducer just can continue to provide electric energy; otherwise luminous energy disappears; the luminous energy that photoelectric current transducer provides disappears, for the present invention's also just disappearance of electric energy of transducer operation on the spot.
Sampling accuracy of the present invention is guaranteed by superior performance and the parameter designing of analog sampling module (comprising: operational amplifier and resistance circuit).As can be seen from Figure 2, this circuit is a ratio amplifying circuit, determines the size of output sampled value voltage by resistance R 1 and the ratio of resistance R _ f.The present invention is by increasing resistance R 2, the resistance R 3 resistance accurate adjustment output voltages in parallel with resistance R _ f, to meet the requirements of precision.Through on-the-spot test, A/D conversion accuracy of the present invention can reach 0.2%, meets the required precision of Hybrid Optic DC Measurement System.
Whether can judge in time, effectively, accurately photoelectric current converter output voltage lower than default 3.3V threshold voltage by low-voltage determination module, and the result--low-voltage flag of judgement is fed back to laser energy supply platform, laser energy supply platform is adjusted the power of the laser signal of the generating laser output in platform in real time, exports to laser signal input of the present invention---photoelectric current transducer.Low voltage signal makes the generating laser of outside laser energy supply platform in lower power output state in time, effectively, accurately, while surveying the output of its practical stability, current value is 230mA left and right, has extended the useful life of the photoelectric current transducer of converter and the generating laser of laser energy supply platform on the spot simultaneously.
Use this on the spot the Hybrid Optic DC Measurement System exemplary operation electric current of transducer lower than 100mA, meet low-power consumption requirement.
Claims (7)
1. Hybrid Optic DC Measurement System converter on the spot, it connects between instrument transformer low-pressure side and ground protective device, it is characterized in that, comprise photoelectric current transducer, electric flux and Control on Communication demultiplexing circuit, buffer circuit, DC-DC change-over circuit, Clock Extraction module, low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Photoelectric current transducer receives the laser signal that the laser energy supply platform of ground protective device sends and is added on the Control on Communication signal on laser signal and is converted to electric flux and after the Control on Communication signal on electric flux, outputs to electric flux and Control on Communication demultiplexing circuit in addition;
The electric flux of electric flux and Control on Communication demultiplexing circuit reception input and in addition the Control on Communication signal on electric flux carry out separating treatment Hou Fen tri-tunnels outputs, one tunnel output electric energy is to buffer circuit, one road output communication control signal is to clock signal extraction module, and a road output LOW voltage signal is to low-voltage determination module;
Buffer circuit, receives the electric flux that electric flux and Control on Communication demultiplexing circuit are exported, and by DC-DC change-over circuit and the isolation of photoelectric current transducer, guarantees that DC-DC change-over circuit output voltage is interference-free, and this buffer circuit output electric flux is to DC-DC change-over circuit;
DC-DC change-over circuit, receive the electric flux of buffer circuit output, and outputing to respectively low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode after being converted to stable voltage, this voltage is as the working power of low-voltage determination module, analog sampling module, AD modular converter, CPLD module and laser diode;
Clock Extraction module, receives Control on Communication signal Shape correction that electric flux and Control on Communication demultiplexing circuit are exported, and clock signal is to CPLD module, as the synchronous clock source of CPLD module controls AD translation data and transmission data;
Low-voltage determination module, receive the low voltage signal of electric flux and the output of Control on Communication demultiplexing circuit, and compare judgement with the default low-voltage threshold value of this module, produce low-voltage flag and output to CPLD module, send to laser diode by CPLD module, deliver to ground protective device by laser diode by optical fiber transmission, adjust in real time the power of the laser signal of the generating laser output in laser energy supply platform;
Analog sampling module is amplified, samples, is processed the analog quantity of instrument transformer low-pressure side and exports sampled value to AD modular converter;
AD modular converter receives the sampled value of analog sampling module output, and is converted to digital quantity, outputs to CPLD module;
The digital quantity of the clock signal of CPLD module receive clock extraction module output, the low-voltage flag of low-voltage determination module output, the output of AD modular converter, this clock signal is as the synchronised clock of CPLD module controls AD translation data and transmission data, under this synchronised clock drives, the synchronous AD translation data of CPLD module and the digital quantity obtaining and low-voltage flag are encoded, and send to ground protective device after being converted to light signal by laser diode;
Laser diode receives the code signal of CPLD module output and changes light signal into; arrive ground protective device by Optical Fiber Transmission; protective device provides the operation information of instrument transformer low-pressure side earthward, and laser energy supply platform is adjusted the power of the laser signal of generating laser output in this platform in real time according to the low-voltage flag of laser diode feedback simultaneously.
2. Hybrid Optic DC Measurement System according to claim 1 converter on the spot, it is characterized in that, described electric flux and Control on Communication demultiplexing circuit are made up of magnetic bead LB1, resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, capacitor C 2, diode D1, after being connected with magnetic bead LB1 one end, resistance R 1 one end connects the output of photoelectric current transducer, resistance R 1 other end is connected with resistance R 2 one end, resistance R 2 other end ground connection, Control on Communication signal is from resistance R 1 and resistance R 2 junction outputs; The magnetic bead LB1 other end is connected with the positive pole of diode D1, and electric energy is from the negative pole output of diode D1; After capacitor C 1 and capacitor C 2 parallel connections, one end connects the negative pole of diode D1, other end ground connection; Resistance R 3 one end connect diode D1 negative pole, and the other end is connected with resistance R 4, resistance R 4 other end ground connection, and low voltage signal is from resistance R 3 and resistance R 4 junction outputs.
3. Hybrid Optic DC Measurement System according to claim 1 converter on the spot, is characterized in that, described DC-DC change-over circuit adopts LTC3405A chip.
4. Hybrid Optic DC Measurement System according to claim 1 converter on the spot, is characterized in that, the default low-voltage threshold value of described low-voltage determination module is 3.3V.
5. Hybrid Optic DC Measurement System according to claim 1 transducer on the spot, it is characterized in that, described analog sampling module, comprise operational amplifier A, resistance R 1, resistance R 2, resistance R 3, resistance R _ f, operational amplifier A in-phase input end connects reference voltage, instrument transformer low-pressure side output analog quantity one end is connected with resistance R 1 one end, and resistance R 1 other end is connected with the inverting input of operational amplifier A; After resistance R 2, resistance R 3, resistance R _ f three's parallel connection, one end is connected with operational amplifier A inverting input, and the other end is connected with operational amplifier A output; Operational amplifier A output output sampled value.
6. Hybrid Optic DC Measurement System according to claim 1 converter on the spot, is characterized in that, described AD modular converter adopts the ADC chip of the sixteen bit precision of low-power consumption.
7. Hybrid Optic DC Measurement System according to claim 1 converter on the spot, is characterized in that, described CPLD module adopts programmable logic device XC2C128-7VQG100l.
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| CN107742880A (en) * | 2017-11-24 | 2018-02-27 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of intelligent DC protection device and guard method |
| CN109085416A (en) * | 2018-08-10 | 2018-12-25 | 杨巍 | A kind of digitized voltage sensor module |
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Application publication date: 20140521 |