CN103323723A - Offshore power grid power distribution terminal energy source monitoring device and monitoring method - Google Patents
Offshore power grid power distribution terminal energy source monitoring device and monitoring method Download PDFInfo
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Abstract
The invention relates to an offshore power grid power distribution terminal energy source monitoring device and a monitoring method. The offshore power grid power distribution terminal energy source monitoring device comprises a current transformer conditioning circuit; loop three-phase current and loop residual current at an offshore power grid power distribution terminal flow through the current transformer conditioning circuit to be processed and then are input into a metering and analyzing module; loop three-phase voltage of the offshore power grid power distribution terminal is processed through a voltage adjusting circuit and then is input into the metering and analyzing module; the metering and analyzing module calculates all electric quantity parameters of each phase and a combined phase according to a received current value and a received voltage value; the electric quantity parameters are read into a control module through an SPI (Serial Peripheral Interface); the control module is used for controlling all the received electric quantity parameters to realize monitoring of residual current of an offshore power grid power distribution terminal energy source and the temperature of a power distribution loop conductor, and tendency predication and analysis of the residual current. According to the monitoring method disclosed by the invention, the detection of the residual current and tendency thereof, and the temperature of the power distribution loop conductor can be realized. The offshore power grid power distribution terminal energy source monitoring device and the monitoring method disclosed by the invention are applicable to all the power grid power distribution terminals.
Description
Technical field
The present invention relates to marine electrical network energy monitoring technical field, particularly about the terminal energy monitoring device of a kind of marine electrical network distribution for the electric system energy monitoring and monitoring method.
Background technology
The energy monitoring device is the effective monitoring that realizes electric energy consumption on the basis of electric instrument, it is the requisite survey instrument of present electric system, energy monitoring also is to ensure that electric system and power equipment safety thereof move one of indispensable means, it can reflect the parameters of electric power in loop in the Operation of Electric Systems process, the electric energy consumption situation is done whole energy consumption analysis for total system the data support is provided.Along with the utilization at measurement instrument of the continuous development of electric utility and integrated circuit, the requirement of measurement instrument is also more and more higher, becomes the electric power monitoring necessary tool.Now the energy monitoring apparatus function is more single, can only realize loop electrical quantity and energy consumption monitoring substantially, and the high-end instrument of part increases the power quality parameter monitoring, and can not satisfy electric system to energy monitor and reliability and the requirement of depositing.
Especially at offshore oilfield platform minor scale power net system, the stability of electrical network own is just unlike the big network system good stability in land, in addition, the characteristics that offshore platform production is continuous, equipment mostly is powerful device in the electric system, and the output terminal of frequency converter adopts the device for power switching of PWM control technology (as IGBT more, GTO), switch motion at a high speed makes inverter output form electromagnetic interference (EMI) or common mode voltage by circuit or the coupling of electromagnetic wave space, may cause excessive sharp wave voltage to motor load or whole electrical network, vibration, be coupled to problems such as ground wire with electromagnetic form, cause the circuit high frequency interference more, bigger to the normal influence on system operation of the stability of electrical network and other equipment.Therefore, the terminal measurement instrument of offshore platform also needs real-time security monitoring, especially residual current, high-frequency interferencing signal, the monitoring of conductor temperature, trend analysis to end-equipment particularly important except needs satisfy the function of electric quantity monitoring.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide the terminal energy monitoring device of a kind of marine electrical network distribution and reach monitoring method, on-line monitoring and warning in the time of multiple function such as electric energy, the quality of power supply, high frequency interference, conductor temperature of having realized marine electrical network distribution end can also be to the real-time estimates of conductor aging tendency.
For achieving the above object, the present invention takes following technical scheme: the terminal energy monitoring device of a kind of marine electrical network distribution, and it is characterized in that: it comprises current transformer modulate circuit, quantitative analysis module, voltage modulate circuit and control module; Loop three-phase current and the loop residual current of marine electrical network distribution end input in the described quantitative analysis module after described current transformer is adjusted processing of circuit; The loop three-phase voltage of marine electrical network distribution end also inputs in the described quantitative analysis module after described voltage-regulating circuit is handled; Described quantitative analysis module calculates each mutually and all electrical parameters that close phase according to the current value that receives and magnitude of voltage, and this electrical parameter is read in the described control module through the SPI interface, described control module is controlled all electrical parameters that receive, and realizes residual current, the monitoring of distribution loop conductor temperature and trend prediction and the analysis of residual current to the terminal energy of marine electrical network distribution.
Described control module comprises CPU, LCD pilot lamp, communication interface, keyboard load module, switching input module, first photoelectric isolating circuit, LED emergency warning lamp, second photoelectric isolating circuit, switching value output module, external temperature sensor, clock module, ferroelectric memory, jtag interface and hummer; After all electrical parameters that described CPU will receive are handled, show the result by described LCD pilot lamp, or show by described communication interface connection background monitoring system; Described keyboard load module is used for to described CPU input of control commands; Described switching input module is used for to the described first photoelectric isolating circuit input switch status signal, and described first photoelectric isolating circuit suppresses the undesired signal in the switch state signal, and the switch state signal after will handling inputs in the described CPU; By described LED emergency warning lamp current switching value state is shown simultaneously; Background monitoring system inputs to described CPU with steering order by described communication interface, exports switching value signal through described second photoelectric isolating circuit to described switching value output module by described CPU, with adhesive or the disconnection of control external device relay; Described external temperature sensor inputs to the distribution loop conductor temperature that collects in the described CPU, is used for the distribution loop conductor temperature is monitored; Described clock module connects described CPU, is used for the simultaneity of guaranteeing that electric current, voltage data are gathered; Described ferroelectric memory is used for the various data of the described CPU of storage to form historical data; Described CPU connects adapter by described jtag interface, realizes described CPU internal program is compiled debugging and upgrading; Described hummer connects described CPU, is used for output alarm information when breaking down.
The current transformer that described current transformer is adjusted in the circuit adopts high permeability material.
Be provided with low-pass filter circuit, ADC and digital signal processor in the described quantitative analysis module; Described current transformer modulate circuit and voltage modulate circuit behind described low-pass filter circuit filtering high-frequency interferencing signal, input to electric current, voltage signal among the described DSP through described ADC and to handle, and get the terminal loop of marine electrical network distribution electrical parameter.
Preset four residual current forecast models in the described CPU, be respectively linear model Ip=a+bt, power function model Ip=at
b+ c, logarithmic model Ip=a+blnt+c and quadratic function model Ip=at
2+ bt+c; Wherein, Ip is the residual current predicted value, and t is the time, and a, b, c are constant.
Monitoring method based on the terminal energy monitoring device of the above marine electrical network distribution, it comprises trend forecasting method and the distribution loop conductor temperature detection method of residual current monitoring method, residual current, and it is characterized in that: described residual current monitoring method may further comprise the steps: 1) obtain residual electricity flow valuve in the current supply circuit in real time by the current transformer modulate circuit; 2) the residual current signal that step 1) is obtained inputs to the quantitative analysis module, carries out analog to digital conversion in the input ADC after low-pass filter circuit is handled, and obtains digital quantity residual current signal; 3) digital quantity residual current signal inputs among the CPU after DSP handles, and the residual current signal value after the processing is the actual value Ir of residual current; 4) judge the size of residual current actual value Ir and residual current standard limit value Ie, work as Ir Ie is true time, execution in step 5), otherwise enter step 6); 5) signal of current supply circuit is cut off in output, and the LCD pilot lamp shows the cut-out current supply circuit, the corresponding flicker of LED emergency warning lamp; 6) judging the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, if Ir〉0.5Ie be very, the alert signal that warns, by LCD pilot lamp display status information, the LED emergency warning lamp glimmers, buzzer warning; Otherwise, return step 1), proceed the monitoring of residual current.
The trend forecasting method of described residual current may further comprise the steps: (t chooses 3～5 groups of data of continuously smooth in Ir) to the residual current historical data of 1) storing from ferroelectric memory, the data of choosing is inputed in the linear model in the CPU obtain Ip=a
1+ b
1T, Ip are the residual current predicted value, a
1, b
1Be constant; Predict following residual current data by the linear model that obtains, and the residual current data of prediction are compared with the actual data that obtain, obtain the average error △ E1 of linear model, preserve this average error and corresponding function model thereof; 2) (t chooses several groups of data of continuously smooth in Ir), obtains Ip=a in the power function model among the substitution CPU in historical data according to the method identical with step 1)
2t
B2+ c
2Average error △ E2 with power function model; With the average error △ E1 of the linear model that obtains in the average error △ E2 of power function model and the step 1) relatively, preserves the function model of less average error and correspondence thereof; 3) according to the method identical with step 1), obtain logarithmic model Ip=a
3+ b
3Lnt+c
3Average error △ E3 with logarithmic model; And with average error △ E3 and the step 2 of logarithmic model) average error of preserving compares, and keeps the function model of less average error and correspondence thereof; 4) obtain quadratic function model Ip=a according to the method identical with step 1)
4t
2+ b
4T+c
4Average error △ E4 with the quadratic function model; Compare with the average error of preserving in the step 3), preserve less average error and corresponding function model thereof; 5) average error and the corresponding function model thereof preserved in the step 4) of output, and with this average error as standard error △ E, the corresponding function model of standard error △ E is as selected function model; 6) selected function model is carried out self checking at times, being about to the residual electricity flow valuve of function model prediction and actual residual electricity flow valuve compares, judge whether the error in the checking procedure has exceeded standard error △ E, if having exceeded standard error △ E then returns step 1), carry out the screening of function model again; Otherwise enter step 7); 7) function model that obtains in the step 5) continues to utilize this function model that residual current is predicted by self checking.
In the described step 1), the average error △ E1 of described linear model is: △ E1=|Ip-Ir|.
Described distribution loop conductor temperature detection method may further comprise the steps: 1) CPU obtains the distribution loop conductor temperature signal that external temperature sensor collects in the distribution loop in real time; 2) CPU carries out analog to digital conversion with the distribution loop conductor temperature signal that obtains, and obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr; 3) if relatively actual temperature value Tr and predefined temperature standard limit value Te are Tr〉Te be vacation, shows that then the distribution loop conductor temperature is not out-of-limit, return the step 1) continuation distribution loop conductor temperature is detected; If Tr〉Te be true, shows that then the distribution loop conductor temperature is out-of-limit, and the out-of-limit time of beginning bulk registration distribution loop conductor temperature is also sent alerting signal, and the LCD pilot lamp showed and judged output and warning message this moment, and the LED emergency warning lamp glimmers, buzzer warning.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, because the offshore platform network system is different from the big network system in land, have the characteristic of oneself, can not use land electrical network standard.The present invention can realize monitorings in real time such as offshore platform adapted electricity loop common mode voltage, residual current, distribution loop conductor temperature; real-time guard distribution loop safety; slow down the equipment degradation speed, the present invention simultaneously can also provide favourable data foundation for analysis, the formulation industry standard of offshore platform energy data.Not only the terminal energy of marine electrical network distribution is carried out on-line monitoring, and residual current is done trend analysis, the preceding prompting of doing things, thereby the serviceable life of improving equipment greatly.2, the present invention is owing to be provided with four residual current forecast models in CPU, and then can realize residual current trend prediction and warning function, reduced the generation of failure accident, improved service life of equipment.3, the present invention is applicable to all electrical network distribution ends, be particularly useful for the offshore platform electrical network, because offshore platform is to the safety of electrical network, the health status of equipment requires higher, and the offshore platform electrical network is subjected to the influence of non-linear responsible interference big, platform space is very limited, therefore, this device is fit to offshore platform electrical network distribution end very much, not only realized a multiple function of device, each parameter of electric energy of satisfying the offshore platform monitoring requirements and the monitoring of quality condition thereof have been comprised, the high frequency interference monitoring, conductor temperature is monitored and can also be provided residual current trend to forecast in advance, reduce the generation of equipment failure accident, improve service life of equipment, and significantly reduced the difficult problem that a plurality of monitoring devices are installed at platform, improved the electricity consumption reliability of offshore platform electrical network, economy.
Description of drawings
Fig. 1 is theory structure synoptic diagram of the present invention;
Fig. 2 is quantitative analysis inside modules structural representation of the present invention;
Fig. 3 is residual current testing process synoptic diagram of the present invention;
Fig. 4 is residual current trend prediction schematic flow sheet of the present invention;
Fig. 5 is temperature detection schematic flow sheet of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1, the terminal energy monitoring device of marine electrical network distribution comprises current transformer modulate circuit 1, quantitative analysis module 2, voltage modulate circuit 3 and control module 4.
The loop three-phase current of marine electrical network distribution end and loop residual current are adjusted through current transformer and are inputed in the quantitative analysis module 2 after circuit 1 is handled; The loop three-phase voltage of marine electrical network distribution end also inputs in the quantitative analysis module 2 after voltage-regulating circuit 3 is handled.Quantitative analysis module 2 calculates each mutually and the active power, reactive power, applied power, active electrical degree and the idle electric degree that close phase according to the current value that receives and magnitude of voltage, and the electrical parameters such as effective value, power factor and frequency of each phase current, voltage, and this electrical parameter is read in the control module 4 through the SPI interface, all electrical parameters that 4 pairs of control modules receive are controlled, and realize residual current, the monitoring of distribution loop conductor temperature and trend prediction and the analysis of residual current to the terminal energy of marine electrical network distribution.
In above-described embodiment, as shown in Figure 2, be provided with low-pass filter circuit 21, analog to digital converter (ADC) 22 and digital signal processor (DSP) 23 in the quantitative analysis module 2.Current transformer modulate circuit 1 and voltage modulate circuit 3 with electric current, voltage signal behind low-pass filter circuit 21 filtering high-frequency interferencing signals, input in the ADC22 analog signal conversion is become digital signal, input among the DSP23 and handle, obtain each mutually and the active power, reactive power, applied power, active electrical degree and the idle electric degree that close phase, and the electrical parameters such as effective value, power factor and frequency of each phase current, voltage.Wherein, high-frequency interferencing signal is mainly derived from the impact that circuit opens circuit suddenly or the thunder and lightning transient causes, and owing to lightning, earth fault or switch the ringing that signal parameter that inductive equipment causes produces.
In the various embodiments described above, the current transformer that current transformer is adjusted in the circuit 1 is to adopt well behaved high permeability material, and magnetic shielding cover is installed outside winding, can reduce outside electromagnetic interference.
As shown in Figure 1, control module 4 of the present invention comprises CPU5, LCD pilot lamp 6, communication interface 7, keyboard load module 8, switching input module 9, first photoelectric isolating circuit 10, LED emergency warning lamp 11, second photoelectric isolating circuit 12, switching value output module 13, external temperature sensor 14, clock module 15, ferroelectric memory 16, jtag interface 17 and hummer 18.
After all electrical parameters that CPU5 will receive are handled, by LCD pilot lamp 6 result is shown, also can connect background monitoring systems by communication interface 7 and show.
Keyboard load module 8 is used for to the CPU5 input of control commands, with function choosing-item such as realize that the CPU5 inner parameter is set, checked.
Switching input module 9 is used for to first photoelectric isolating circuit, 10 input switch status signals, the undesired signal that first photoelectric isolating circuit 10 suppresses in the switch state signal, make current potential change, the switch state signal after will handling then inputs to and carries out the digital and analogue signals conversion in the CPU5.Signal after the conversion is demonstrated the state of switching value at background monitoring system by communication interface 7 by CPU5; Show by 11 pairs of current switching value states of LED emergency warning lamp simultaneously.The switching value input can connect common remote signalling (supervision of major loop circuit-breaker status), fire-fighting link, smog fire-fighting etc.
Background monitoring system inputs to CPU5 with steering order by communication interface 7, export switching value signals through second photoelectric isolating circuit 12 to switching value output module 13 by CPU5, and then adhesive or the disconnection of control external device relay, the switching value output state shows at LCD pilot lamp 6 simultaneously.Be output as example with 1 way switch amount wherein, when sending when driving signal, the relay contact adhesive is shown as closure state on the LCD pilot lamp 6 simultaneously; When closing the driving signal, relay contact disconnects, and is shown as off-state on the LCD pilot lamp 6 simultaneously.Its switching value output can be residual current protecting, warning output, trip signal, reactive-load compensation control etc. by the program setting in the CPU5.
Ferroelectric memory 16 is used for the various data of storage CPU5, and then forms historical data, does not lose in 10 years under power-down conditions to guarantee data.
CPU5 connects adapter by jtag interface 17, realizes the CPU5 internal program is compiled debugging and upgrading.
Hummer 18 is to be set by internal processes by CPU5, exports by hummer 18 warnings when various fault occurring.The warning output of the supervision of the monitoring of the supervision of switching input module 9, switching value output module 13, external temperature sensor 14, hummer 18 and various running status (operation, communication) are all passed through 11 indications of LED emergency warning lamp.
In above-described embodiment, in order to realize that residual current is done secular trend, the present invention adopts and preset four residual current forecast models in CPU5, is respectively linear model Ip=a+bt, power function model Ip=at
b+ c, logarithmic model Ip=a+blnt+c and quadratic function model Ip=at
2+ bt+c.Wherein, Ip is the residual current predicted value, and t is the time, and a, b, c are constant.
Based on the terminal energy monitoring device of marine electrical network distribution of the present invention, the residual current of trend forecasting method and distribution loop conductor temperature detection method comprise residual current monitoring method, to(for) the terminal energy monitoring method of marine electrical network distribution, wherein, the residual current monitoring method may further comprise the steps (as shown in Figure 3):
1) by the current transformer modulate circuit 1 real-time residual electricity flow valuve that obtains in the current supply circuit.
2) the residual current signal that step 1) is obtained inputs to quantitative analysis module 2, carries out analog to digital conversion in the input ADC22 after low-pass filter circuit 21 is handled, and obtains digital quantity residual current signal.
3) the residual current signal value that obtains after DSP23 handles of digital quantity residual current signal inputs among the CPU5, and this residual current signal value is the actual value Ir of residual current.
4) judge the size of residual current actual value Ir and residual current standard limit value Ie, i.e. judgment expression Ir〉whether Ie set up.As expression formula Ir〉Ie is true time, execution in step 5), otherwise enter step 6);
Wherein, the size of residual current standard limit value Ie can be set according to the concrete standard of different circuits and equipment in the national regulation, according to IEC4791 about alternating current (50HZ) when flowing through human body, the contact that human body causes is endangered, even it concentrates on a position of object, rule of thumb prove with fire cases, also not necessarily can cause accident.May cause the numerical value of the harm residual current of accident, China is defined as 300～500mA, when on load equipment so that the people fatal for the words of limit value of adjusting then be boundary with 30mA.
5) signal of current supply circuit is cut off in output, and LCD pilot lamp 6 shows the cut-out current supply circuit, the 11 corresponding flickers of LED emergency warning lamp, and prompting the monitor staff take measures early, fixes a breakdown, and ensures the continuity of powering.
6) judge the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, namely judge formula Ir whether 0.5Ie set up.If expression formula Ir〉0.5Ie be true, the alert signal that warns, by LCD pilot lamp 6 display status informations, 11 flickers of LED emergency warning lamp, hummer 18 is reported to the police, and prompting the monitor staff take measures early, fixes a breakdown, and ensures the continuity of powering; Otherwise, return step 1), proceed the monitoring of residual current.
As shown in Figure 4, the trend forecasting method of residual current of the present invention may further comprise the steps:
1) from ferroelectric memory 16 the residual current historical data of storage (t chooses 3～5 groups of data of continuously smooth in Ir), the data of choosing is inputed to obtain Ip=a in the linear model
1+ b
1T, a
1, b
1Be constant; Predict following residual current data by the linear model that obtains, and the residual current data of prediction are compared with the actual data that obtain, obtain the average error △ E1 of linear model, preserve this average error and corresponding function model thereof.Wherein the average error △ E1 of linear model is:
△E1=|Ip-Iｒ|，
Wherein, the function curve that 3～5 groups of data choosing form is level and smooth substantially, and it is too big to jump, and the too big data of jumping are unavailable, directly give up.
2) (t chooses several groups of data of continuously smooth in Ir), obtains Ip=a in the substitution power function model in historical data according to the method identical with step 1)
2t
B2+ c
2Average error △ E2 with power function model; With the average error △ E1 of the linear model that obtains in the average error △ E2 of power function model and the step 1) relatively, preserves the function model of less average error and correspondence thereof;
3) according to the method identical with step 1), obtain logarithmic model Ip=a
3+ b
3Lnt+c
3Average error △ E3 with logarithmic model; And with average error △ E3 and the step 2 of logarithmic model) average error of preserving compares, and keeps the function model of less average error and correspondence thereof;
4) obtain quadratic function model Ip=a according to the method identical with step 1)
4t
2+ b
4T+c
4Average error △ E4 with the quadratic function model; Compare with the average error of preserving in the step 3), preserve less average error and corresponding function model thereof;
5) average error and the corresponding function model thereof preserved in the step 4) of output, and with this average error as standard error △ E, the corresponding function model of standard error △ E is as selected function model;
6) selected function model is carried out self checking at times, being about to the residual electricity flow valuve of function model prediction and actual residual electricity flow valuve compares, judge whether the error in the checking procedure has exceeded standard error △ E, if having exceeded standard error △ E then returns step 1), carry out the screening of function model again; Otherwise enter step 7);
7) function model that obtains in the step 5) continues to utilize this function model that residual current is predicted by self checking.
As shown in Figure 5, distribution loop conductor temperature detection method of the present invention may further comprise the steps:
1) CPU5 obtains the distribution loop conductor temperature signal that external temperature sensor 14 collects in the distribution loop in real time;
2) CPU5 carries out analog to digital conversion with the distribution loop conductor temperature signal that obtains, and obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr;
3) relatively actual temperature value Tr can set according to the concrete standard of different circuits and equipment in the national regulation with predefined temperature standard limit value Te(temperature standard limit value Te), if Tr〉Te be vacation, show that then the distribution loop conductor temperature is not out-of-limit, return step 1) and continue the distribution loop conductor temperature is detected; If Tr〉Te is true, show that then the distribution loop conductor temperature is out-of-limit, the out-of-limit time of beginning bulk registration distribution loop conductor temperature is also sent alerting signal, and this moment, output and warning message were judged in 6 demonstrations of LCD pilot lamp, 11 flickers of LED emergency warning lamp, hummer 18 is reported to the police.Simultaneously, the staff can be according to the out-of-limit time prediction conductor of accumulation to thoroughly aging excess time.
In sum, the present invention can dynamically monitor the electricity consumption situation of distribution loop, and residual current, conductor temperature situation, load characteristic and territorial environment characteristic according to monitoring circuit, in residual current threshold value and the temperature threshold values of freely arranging at different levels, finish the warning of distribution loop energy monitoring and residual current, warning function, realize the monitoring of distribution loop Real time Efficiency, safety monitoring double shield.
The various embodiments described above only are used for explanation the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solution of the present invention all should do not got rid of outside protection scope of the present invention.
Claims (10)
1. terminal energy monitoring device of marine electrical network distribution, it is characterized in that: it comprises current transformer modulate circuit, quantitative analysis module, voltage modulate circuit and control module; Loop three-phase current and the loop residual current of marine electrical network distribution end input in the described quantitative analysis module after described current transformer is adjusted processing of circuit; The loop three-phase voltage of marine electrical network distribution end also inputs in the described quantitative analysis module after described voltage-regulating circuit is handled; Described quantitative analysis module calculates each mutually and all electrical parameters that close phase according to the current value that receives and magnitude of voltage, and this electrical parameter is read in the described control module through the SPI interface, described control module is controlled all electrical parameters that receive, and realizes residual current, the monitoring of distribution loop conductor temperature and trend prediction and the analysis of residual current to the terminal energy of marine electrical network distribution.
2. the terminal energy monitoring device of a kind of marine electrical network distribution as claimed in claim 1, it is characterized in that: described control module comprises CPU, LCD pilot lamp, communication interface, keyboard load module, switching input module, first photoelectric isolating circuit, LED emergency warning lamp, second photoelectric isolating circuit, switching value output module, external temperature sensor, clock module, ferroelectric memory, jtag interface and hummer;
After all electrical parameters that described CPU will receive are handled, show the result by described LCD pilot lamp, or show by described communication interface connection background monitoring system;
Described keyboard load module is used for to described CPU input of control commands;
Described switching input module is used for to the described first photoelectric isolating circuit input switch status signal, and described first photoelectric isolating circuit suppresses the undesired signal in the switch state signal, and the switch state signal after will handling inputs in the described CPU; By described LED emergency warning lamp current switching value state is shown simultaneously;
Background monitoring system inputs to described CPU with steering order by described communication interface, exports switching value signal through described second photoelectric isolating circuit to described switching value output module by described CPU, with adhesive or the disconnection of control external device relay;
Described external temperature sensor inputs to the distribution loop conductor temperature that collects in the described CPU, is used for the distribution loop conductor temperature is monitored;
Described clock module connects described CPU, is used for the simultaneity of guaranteeing that electric current, voltage data are gathered;
Described ferroelectric memory is used for the various data of the described CPU of storage to form historical data;
Described CPU connects adapter by described jtag interface, realizes described CPU internal program is compiled debugging and upgrading;
Described hummer connects described CPU, is used for output alarm information when breaking down.
3. the terminal energy monitoring device of a kind of marine electrical network distribution as claimed in claim 1 is characterized in that: the current transformer employing high permeability material in the described current transformer adjustment circuit.
4. the terminal energy monitoring device of a kind of marine electrical network distribution as claimed in claim 2 is characterized in that: the current transformer employing high permeability material in the described current transformer adjustment circuit.
5. as claim 1 or the terminal energy monitoring device of 2 or 3 or 4 described a kind of marine electrical network distribution, it is characterized in that: be provided with low-pass filter circuit, ADC and digital signal processor in the described quantitative analysis module; Described current transformer modulate circuit and voltage modulate circuit behind described low-pass filter circuit filtering high-frequency interferencing signal, input to electric current, voltage signal among the described DSP through described ADC and to handle, and get the terminal loop of marine electrical network distribution electrical parameter.
6. as claim 1 or the terminal energy monitoring device of 2 or 3 or 4 described a kind of marine electrical network distribution, it is characterized in that: preset four residual current forecast models in the described CPU, be respectively linear model Ip=a+bt, power function model Ip=at
b+ c, logarithmic model Ip=a+blnt+c and quadratic function model Ip=at
2+ bt+c; Wherein, Ip is the residual current predicted value, and t is the time, and a, b, c are constant.
7. based on the monitoring method of the terminal energy monitoring device of marine electrical network distribution as described in any one of claim 1～6, it comprises trend forecasting method and the distribution loop conductor temperature detection method of residual current monitoring method, residual current, and it is characterized in that: described residual current monitoring method may further comprise the steps:
1) obtains residual electricity flow valuve in the current supply circuit in real time by the current transformer modulate circuit;
2) the residual current signal that step 1) is obtained inputs to the quantitative analysis module, carries out analog to digital conversion in the input ADC after low-pass filter circuit is handled, and obtains digital quantity residual current signal;
3) digital quantity residual current signal inputs among the CPU after DSP handles, and the residual current signal value after the processing is the actual value Ir of residual current;
4) judge the size of residual current actual value Ir and residual current standard limit value Ie, work as Ir Ie is true time, execution in step 5), otherwise enter step 6);
5) signal of current supply circuit is cut off in output, and the LCD pilot lamp shows the cut-out current supply circuit, the corresponding flicker of LED emergency warning lamp;
6) judging the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, if Ir〉0.5Ie be very, the alert signal that warns, by LCD pilot lamp display status information, the LED emergency warning lamp glimmers, buzzer warning; Otherwise, return step 1), proceed the monitoring of residual current.
8. the terminal energy monitoring method of marine electrical network distribution as claimed in claim 7, it is characterized in that: the trend forecasting method of described residual current may further comprise the steps:
(t chooses 3～5 groups of data of continuously smooth in Ir) to the residual current historical data of 1) storing from ferroelectric memory, the data of choosing is inputed in the linear model in the CPU obtain Ip=a
1+ b
1T, Ip are the residual current predicted value, a
1, b
1Be constant; Predict following residual current data by the linear model that obtains, and the residual current data of prediction are compared with the actual data that obtain, obtain the average error △ E1 of linear model, preserve this average error and corresponding function model thereof;
2) (t chooses several groups of data of continuously smooth in Ir), obtains Ip=a in the power function model among the substitution CPU in historical data according to the method identical with step 1)
2t
B2+ c
2Average error △ E2 with power function model; With the average error △ E1 of the linear model that obtains in the average error △ E2 of power function model and the step 1) relatively, preserves the function model of less average error and correspondence thereof;
3) according to the method identical with step 1), obtain logarithmic model Ip=a
3+ b
3Lnt+c
3Average error △ E3 with logarithmic model; And with average error △ E3 and the step 2 of logarithmic model) average error of preserving compares, and keeps the function model of less average error and correspondence thereof;
4) obtain quadratic function model Ip=a according to the method identical with step 1)
4t
2+ b
4T+c
4Average error △ E4 with the quadratic function model; Compare with the average error of preserving in the step 3), preserve less average error and corresponding function model thereof;
5) average error and the corresponding function model thereof preserved in the step 4) of output, and with this average error as standard error △ E, the corresponding function model of standard error △ E is as selected function model;
6) selected function model is carried out self checking at times, being about to the residual electricity flow valuve of function model prediction and actual residual electricity flow valuve compares, judge whether the error in the checking procedure has exceeded standard error △ E, if having exceeded standard error △ E then returns step 1), carry out the screening of function model again; Otherwise enter step 7);
7) function model that obtains in the step 5) continues to utilize this function model that residual current is predicted by self checking.
9. the terminal energy monitoring method of marine electrical network distribution as claimed in claim 8, it is characterized in that: in the described step 1), the average error △ E1 of described linear model is:
△E1=|Ip-Iｒ|。
10. the terminal energy monitoring method of marine electrical network distribution as claimed in claim 7, it is characterized in that: described distribution loop conductor temperature detection method may further comprise the steps:
1) CPU obtains the distribution loop conductor temperature signal that external temperature sensor collects in the distribution loop in real time;
2) CPU carries out analog to digital conversion with the distribution loop conductor temperature signal that obtains, and obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr;
3) if relatively actual temperature value Tr and predefined temperature standard limit value Te are Tr〉Te be vacation, shows that then the distribution loop conductor temperature is not out-of-limit, return the step 1) continuation distribution loop conductor temperature is detected; If Tr〉Te be true, shows that then the distribution loop conductor temperature is out-of-limit, and the out-of-limit time of beginning bulk registration distribution loop conductor temperature is also sent alerting signal, and the LCD pilot lamp showed and judged output and warning message this moment, and the LED emergency warning lamp glimmers, buzzer warning.
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| CN101951025B (en) * | 2010-08-19 | 2013-04-10 | 中国海洋石油总公司 | Energy management system of offshore grid |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: Shenzhen Hietech Energy Technology Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: Shenzhen Hietech Energy Technology Co., Ltd. |
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