CN103323723B - A kind of offshore power grid distribution end apparatus for monitoring energy resource and monitoring method - Google Patents
A kind of offshore power grid distribution end apparatus for monitoring energy resource and monitoring method Download PDFInfo
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Abstract
The present invention relates to a kind of offshore power grid distribution end apparatus for monitoring energy resource and monitoring method, it comprises current transformer modulate circuit, and the loop three-phase current of offshore power grid distribution end and loop residual current input in quantitative analysis module after the process of current transformer Circuit tuning; The loop three-phase voltage of offshore power grid distribution end also inputs in quantitative analysis module after voltage-regulating circuit process; Quantitative analysis module calculates each phase according to the current value received and magnitude of voltage and closes all electrical parameters of phase, and this electrical parameter is read in control module through SPI interface, control module controls all electrical parameters received, and realizes the residual current to the offshore power grid distribution end energy, the monitoring of distribution loop conductor temperature and the trend prediction of residual current and analysis.Monitoring method of the present invention can realize the detection to residual current and trend and distribution loop conductor temperature.The present invention is applicable to all electrical network distribution ends.
Description
Technical field
The present invention relates to offshore power grid energy monitoring technical field, particularly about a kind of offshore power grid distribution end apparatus for monitoring energy resource for electric system energy monitoring and monitoring method.
Background technology
Apparatus for monitoring energy resource is the effective monitoring realizing electric energy consumption on the basis of electric instrument, it is the requisite survey instrument of present electric system, energy monitoring is also ensure that electric system and power equipment safety thereof run one of indispensable means, it can reflect the parameters of electric power in loop in Operation of Electric Systems process, electric energy consumption situation, does overall energy consumption analysis for whole system and provides Data support.Along with the development of electric utility and integrated circuit are in the utilization of measurement instrument, the requirement of measurement instrument is also more and more higher, becomes the requisite instrument of electric power monitoring.Present apparatus for monitoring energy resource function is more single, substantially can only realize loop electrical quantity and energy consumption monitoring, and the high-end instrument of part increases power quality parameter monitoring, and can not meet electric system to energy monitor and reliability and the requirement of depositing.
Especially for offshore oilfield platform minor scale power net system, the stability of electrical network own is just unlike land bulk power system good stability, in addition, continuous print feature produced by offshore platform, in electric system, equipment mostly is powerful device, and the device for power switching of the output terminal of frequency converter many employings PWM control technology is (as IGBT, GTO), switch motion at a high speed makes inverter export and forms electromagnetic interference (EMI) or common mode voltage by circuit or electromagnetic wave space coupling, excessive sharp wave voltage may be caused to motor load or whole electrical network, vibration, the problems such as ground wire are coupled to electromagnetic form, cause circuit high frequency to disturb more, to the stability of electrical network and the normal influence on system operation of other equipment larger.Therefore, the end measurement instrument of offshore platform, except the function of demand fulfillment electric quantity monitoring, also needs the real-time security monitoring to end-equipment, and the especially monitoring of residual current, high-frequency interferencing signal, conductor temperature, trend analysis are particularly important.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of offshore power grid distribution end apparatus for monitoring energy resource and and monitoring method, on-line monitoring and warning while achieving the several functions such as the electric energy of offshore power grid distribution end, the quality of power supply, high frequency interference, conductor temperature, can also to the real-time estimate of conductor aging tendency.
For achieving the above object, the present invention takes following technical scheme: a kind of offshore power grid distribution end apparatus for monitoring energy resource, is characterized in that: it comprises current transformer modulate circuit, quantitative analysis module, voltage modulate circuit and control module; The loop three-phase current of offshore power grid distribution end and loop residual current input in described quantitative analysis module after the process of described current transformer Circuit tuning; The loop three-phase voltage of offshore power grid distribution end also inputs in described quantitative analysis module after described voltage-regulating circuit process; Described quantitative analysis module calculates each phase according to the current value received and magnitude of voltage and closes all electrical parameters of phase, and this electrical parameter is read in described control module through SPI interface, described control module controls all electrical parameters received, and realizes the residual current to the offshore power grid distribution end energy, the monitoring of distribution loop conductor temperature and the trend prediction of residual current and analysis.
Described control module comprises CPU, LCD pilot lamp, communication interface, input through keyboard module, switching input module, the first photoelectric isolating circuit, LED emergency warning lamp, the second photoelectric isolating circuit, switching value output module, external temperature sensor, clock module, ferroelectric memory, jtag interface and hummer; Described CPU, by after all electrical parameter process of receiving, shows result by described LCD pilot lamp, or connects background monitoring system by described communication interface and show; Described input through keyboard module is used for described CPU input of control commands; Described switching input module is used for described first photoelectric isolating circuit input switch status signal, and described first photoelectric isolating circuit suppresses the undesired signal in switch state signal, and inputs in described CPU by the switch state signal after process; By described LED emergency warning lamp, current switch amount state is shown simultaneously; Steering order is inputed to described CPU by described communication interface by background monitoring system, by described CPU through described second photoelectric isolating circuit to described switching value output module output switch amount signal, to control adhesive or the disconnection of external device relay; The distribution loop conductor temperature collected inputs in described CPU by described external temperature sensor, for monitoring distribution loop conductor temperature; Described clock module connects described CPU, for guaranteeing the simultaneity that electric current, voltage data gather; Described ferroelectric memory is for storing various data in described CPU with history of forming data; Described CPU, by described jtag interface Payload attach fitting, realizes carrying out compiling debugging and upgrading to described CPU internal program; Described hummer connects described CPU, for the output alarm information when breaking down.
Current transformer in described current transformer Circuit tuning adopts high permeability material.
Low-pass filter circuit, ADC and digital signal processor is provided with in described quantitative analysis module; Electric current, voltage signal after described low-pass filter circuit filtering high-frequency interferencing signal, input in described DSP through described ADC and process, obtain offshore power grid distribution end loop electrical parameter by described current transformer modulate circuit and voltage modulate circuit.
Preset four residual current forecast models in 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 models Ip=at
2+ bt+c; Wherein, Ip is residual current predicted value, and t is the time, and a, b, c are constant.
Based on the monitoring method of the above offshore power grid distribution end apparatus for monitoring energy resource, it comprises residual current monitoring method, the trend forecasting method of residual current and distribution loop conductor temperature detection method, it is characterized in that: described residual current monitoring method comprises the following steps: 1) obtained the residual electricity flow valuve in current supply circuit in real time by current transformer modulate circuit; 2) the residual current signal that step 1) obtains is inputed to quantitative analysis module, input after low-pass filter circuit process in ADC and carry out analog to digital conversion, obtain digital quantity residual current signal; 3) digital quantity residual current signal inputs in CPU after DSP process, and the residual current signal value after process 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, when Ir>Ie is true time, perform step 5), otherwise enter step 6); 5) outputting cutting breaks the signal of current supply circuit, and current supply circuit is cut off in the display of LCD pilot lamp, the flicker of LED emergency warning lamp correspondence; 6) judge the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, if Ir>0.5Ie is true, warn alert signal, and by LCD indicating lamp display mode information, 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 comprises the following steps: the data chosen are inputed in the linear model in CPU and obtain Ip=a by 3 ~ 5 groups of data choosing continuously smooth in the residual current historical data (t, Ir) 1) stored from ferroelectric memory
1+ b
1t, Ip are residual current predicted value, a
1, b
1for constant; By the following residual current data of Linear Model for Prediction obtained, and the residual current data of prediction and the actual data obtained are compared, obtain the average error △ E1 of linear model, preserve the function model of this average error and correspondence thereof; 2) in historical data (t, Ir), choose several groups of data of continuously smooth according to the method identical with step 1), substitute in the power function model in CPU and obtain Ip=a
2t
b2+ c
2with the average error △ E2 of power function model; The average error △ E2 of power function model is compared with the average error △ E1 of the linear model obtained in step 1), preserves the function model of less average error and correspondence thereof; 3) according to the method identical with step 1), logarithmic model Ip=a is obtained
3+ b
3lnt+c
3with the average error △ E3 of logarithmic model; And by the average error △ E3 of logarithmic model and step 2) average error of preserving compares, and retains the function model of less average error and correspondence thereof; 4) quadratic function models Ip=a is obtained according to the method identical with step 1)
4t
2+ b
4t+c
4with the average error △ E4 of quadratic function models; Compare with the average error of preserving in step 3), preserve the function model of less average error and correspondence thereof; 5) export in step 4) the function model of average error and the correspondence thereof of preserving, and using this average error as the function model corresponding to standard error △ E, standard error △ E as selected function model; 6) self checking is carried out to selected function model at times, residual electricity flow valuve by function model prediction contrasts with actual residual electricity flow valuve, whether the error in judgement checking procedure is beyond standard error △ E, if beyond standard error △ E, return step 1), re-start the screening of function model; Otherwise enter step 7); 7) function model obtained in step 5), by self checking, continues to utilize this function model to predict residual current.
In described step 1), the average error △ E1 of described linear model is: △ E1=|Ip-Ir|.
Described distribution loop conductor temperature detection method comprises the following steps: 1) CPU obtains the distribution loop conductor temperature signal that distribution loop exterior temperature sensor collects in real time; 2) the distribution loop conductor temperature signal of acquisition is carried out analog to digital conversion by CPU, obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr; 3) the temperature standard limit value Te comparing actual temperature value Tr and preset, if Tr>Te is false, then shows that distribution loop conductor temperature is not out-of-limit, returns step 1) and continues to detect distribution loop conductor temperature; If Tr>Te is true, then show that distribution loop conductor temperature is out-of-limit, start the threshold crossing time of bulk registration distribution loop conductor temperature and send alerting signal, now LCD pilot lamp display judges to export and warning message, LED emergency warning lamp glimmers, buzzer warning.
The present invention is owing to taking above technical scheme, and it has the following advantages: 1, because offshore platform network system is different from land bulk power system, have the characteristic of oneself, can not apply land electrical network standard.The present invention can realize the Real-Time Monitorings such as offshore platform adapted electricity loop common mode voltage, residual current, distribution loop conductor temperature; real-time guard distribution loop safety; slow down equipment degradation speed, the present invention simultaneously can also provide favourable data foundation for the analysis of offshore platform energy data, formulation industry standard.Not only on-line monitoring is carried out to the offshore power grid distribution end energy, and trend analysis is done to residual current, remind before doing things, thus greatly improve the serviceable life of equipment.2, the present invention owing to being provided with four residual current forecast models in CPU, and then can realize residual current trend prediction and warning function, decreases the generation of failure accident, improve service life of equipment.3, the present invention is applicable to all electrical network distribution ends, be particularly useful for offshore platform electrical network, because offshore platform is to the safety of electrical network, the health status of equipment requires higher, and offshore platform electrical network is large by the impact of non-linear responsible interference, platform space is very limited, therefore, this device is very applicable to offshore platform electrical network distribution end, not only achieve a device several functions, include the monitoring of each parameter of the electric energy meeting offshore platform monitoring requirements and quality condition thereof, high frequency interference is monitored, conductor temperature is monitored and residual current trend can also be provided to forecast in advance, reduce the generation of equipment failure accident, improve service life of equipment, and greatly reduce the difficult problem that multiple monitoring device installs on platform, improve the electricity consumption reliability of offshore platform electrical network, economy.
Accompanying drawing explanation
Fig. 1 is theory structure schematic diagram of the present invention;
Fig. 2 is quantitative analysis inside modules structural representation of the present invention;
Fig. 3 is residual current detection schematic flow sheet 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, offshore power grid distribution end apparatus for monitoring energy resource comprises current transformer modulate circuit 1, quantitative analysis module 2, voltage modulate circuit 3 and control module 4.
The loop three-phase current of offshore power grid distribution end and loop residual current input in quantitative analysis module 2 after current transformer Circuit tuning 1 processes; The loop three-phase voltage of offshore power grid distribution end also inputs in quantitative analysis module 2 after voltage-regulating circuit 3 processes.Quantitative analysis module 2 calculates each phase according to the current value received and magnitude of voltage and closes the active power of phase, reactive power, applied power, active electrical degree and idle electric degree, and each phase current, the effective value of voltage, the electrical parameter such as power factor and frequency, and this electrical parameter is read in control module 4 through SPI interface, control module 4 controls all electrical parameters received, and realizes the residual current to the offshore power grid distribution end energy, the monitoring of distribution loop conductor temperature and the trend prediction of residual current and analysis.
In above-described embodiment, as shown in Figure 2, low-pass filter circuit 21, analog to digital converter (ADC) 22 and digital signal processor (DSP) 23 is provided with in quantitative analysis module 2.Current transformer modulate circuit 1 and voltage modulate circuit 3 by electric current, voltage signal after low-pass filter circuit 21 filtering high-frequency interferencing signal, input in ADC22 and convert simulating signal to digital signal, input in DSP23 and process, obtain each phase and close the active power of phase, reactive power, applied power, active electrical degree and idle electric degree, and the electrical parameter such as each phase current, the effective value of voltage, power factor and frequency.Wherein, high-frequency interferencing signal is mainly derived from the impact that the unexpected open circuit of circuit or thunder and lightning transient cause, and the ringing produced due to lightning, earth fault or the signal parameter that switches inductive equipment and cause.
In the various embodiments described above, the current transformer in current transformer Circuit tuning 1 adopts high permeability material of good performance, and be provided with magnetic shielding cover 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, input through keyboard 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.
Result, by after all electrical parameter process of receiving, is shown by LCD pilot lamp 6, also can connect background monitoring system by communication interface 7 and show by CPU5.
Input through keyboard module 8 for CPU5 input of control commands, the function choosing-item such as to realize CPU5 inner parameter and set, check.
Switching input module 9 is for the first photoelectric isolating circuit 10 input switch status signal, first photoelectric isolating circuit 10 suppresses the undesired signal in switch state signal, current potential is changed, then the switch state signal after process is inputed in CPU5 and carry out digital and analogue signals conversion.Signal after conversion is demonstrated the state of switching value on background monitoring system by communication interface 7 by CPU5; Shown by LED emergency warning lamp 11 pairs of current switch amount states simultaneously.On-off signal can connect common remote signalling (supervision of major loop circuit-breaker status), fire-fighting link, smog fire-fighting etc.
Steering order is inputed to CPU5 by communication interface 7 by background monitoring system, by CPU5 through the second photoelectric isolating circuit 12 to switching value output module 13 output switch amount signal, and then controlling adhesive or the disconnection of external device relay, Simultaneous Switching amount output state shows on LCD pilot lamp 6.For wherein 1 way switch amount output, when sending drive singal, relay contact adhesive, LCD pilot lamp 6 is shown as closure state simultaneously; When closing drive singal, relay contact disconnects, and LCD pilot lamp 6 is shown as off-state simultaneously.Its output switch parameter can be residual current protecting by the program setting in CPU5, report to the police output, trip signal, the control of reactive power compensating etc.
The distribution loop conductor temperature collected inputs in CPU5 by external temperature sensor 14, for monitoring distribution loop conductor temperature, the temperature value calculated shows through LCD pilot lamp 6 by CPU5, also can upload to background monitoring system by communication interface 7 and show.
Clock module 15 connects CPU5, for realizing the time to mark, guarantees the simultaneity that electric current, voltage data gather.
Ferroelectric memory 16 is for storing the various data in CPU5, and then history of forming data, to ensure that data are not lost in 10 years under power-down conditions.
CPU5, by jtag interface 17 Payload attach fitting, realizes carrying out compiling debugging and upgrading to CPU5 internal program.
Hummer 18 is set by internal processes by CPU5, and being reported to the police by hummer 18 when there is various fault is exported.The supervision of the supervision of switching input module 9, the monitoring of switching value output module 13, external temperature sensor 14, the warning output of hummer 18 and various running status (operation, communication) are all indicated by LED emergency warning lamp 11.
In above-described embodiment, in order to realize doing secular trend to residual current, the present invention adopts in CPU5, presets four residual current forecast models, is respectively linear model Ip=a+bt, power function model Ip=at
b+ c, logarithmic model Ip=a+blnt+c and quadratic function models Ip=at
2+ bt+c.Wherein, Ip is residual current predicted value, and t is the time, and a, b, c are constant.
Based on offshore power grid distribution end apparatus for monitoring energy resource of the present invention, residual current monitoring method, the trend forecasting method of residual current and distribution loop conductor temperature detection method are comprised for offshore power grid distribution end energy monitoring method, wherein, residual current monitoring method comprises the following steps (as shown in Figure 3):
1) the residual electricity flow valuve in current supply circuit is obtained in real time by current transformer modulate circuit 1.
2) the residual current signal that step 1) obtains is inputed to quantitative analysis module 2, input in ADC22 after low-pass filter circuit 21 processes and carry out analog to digital conversion, obtain digital quantity residual current signal.
3) the residual current signal value that digital quantity residual current signal obtains after DSP23 process inputs in 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, namely whether judgment expression Ir>Ie sets up.When expression formula Ir>Ie is true time, perform step 5), otherwise enter step 6);
Wherein, the size of residual current standard limit value Ie can set according to circuit different in national regulation and equipment specific standards, when flowing through human body according to IEC4791 about alternating current (50HZ), to the contact harm that human body causes, even if 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 with make people fatal for limit value of adjusting words then with 30mA for boundary.
5) outputting cutting breaks the signal of current supply circuit, and LCD pilot lamp 6 shows and cuts off current supply circuit, and the flicker of LED emergency warning lamp 11 correspondence, prompting monitor staff take measures early, fixes a breakdown, and ensures the continuity of power supply.
6) judge the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, namely judge whether formula Ir>0.5Ie sets up.If expression formula Ir>0.5Ie is true, warn alert signal, and by LCD pilot lamp 6 display status information, LED emergency warning lamp 11 glimmers, and hummer 18 is reported to the police, and prompting monitor staff take measures early, fixes a breakdown, and ensures the continuity of power supply; 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 comprises the following steps:
1) choose 3 ~ 5 groups of data of continuously smooth in the residual current historical data (t, Ir) stored from ferroelectric memory 16, the data chosen are inputed in linear model and obtains Ip=a
1+ b
1t, a
1, b
1for constant; By the following residual current data of Linear Model for Prediction obtained, and the residual current data of prediction and the actual data obtained are compared, obtain the average error △ E1 of linear model, preserve the function model of this average error and correspondence thereof.Wherein the average error △ E1 of linear model is:
△E1=|Ip-Iｒ|，
Wherein, the function curve that 3 ~ 5 groups of data chosen are formed is substantially level and smooth, and can not jump too large, too large data of jumping are unavailable, directly give up.
2) in historical data (t, Ir), choose several groups of data of continuously smooth according to the method identical with step 1), substitute in power function model and obtain Ip=a
2t
b2+ c
2with the average error △ E2 of power function model; The average error △ E2 of power function model is compared with the average error △ E1 of the linear model obtained in step 1), preserves the function model of less average error and correspondence thereof;
3) according to the method identical with step 1), logarithmic model Ip=a is obtained
3+ b
3lnt+c
3with the average error △ E3 of logarithmic model; And by the average error △ E3 of logarithmic model and step 2) average error of preserving compares, and retains the function model of less average error and correspondence thereof;
4) quadratic function models Ip=a is obtained according to the method identical with step 1)
4t
2+ b
4t+c
4with the average error △ E4 of quadratic function models; Compare with the average error of preserving in step 3), preserve the function model of less average error and correspondence thereof;
5) export in step 4) the function model of average error and the correspondence thereof of preserving, and using this average error as the function model corresponding to standard error △ E, standard error △ E as selected function model;
6) self checking is carried out to selected function model at times, residual electricity flow valuve by function model prediction contrasts with actual residual electricity flow valuve, whether the error in judgement checking procedure is beyond standard error △ E, if beyond standard error △ E, return step 1), re-start the screening of function model; Otherwise enter step 7);
7) function model obtained in step 5), by self checking, continues to utilize this function model to predict residual current.
As shown in Figure 5, distribution loop conductor temperature detection method of the present invention comprises the following steps:
1) CPU5 obtains the distribution loop conductor temperature signal that distribution loop exterior temperature sensor 14 collects in real time;
2) the distribution loop conductor temperature signal of acquisition is carried out analog to digital conversion by CPU5, obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr;
3) compare actual temperature value Tr to set according to circuit different in national regulation and equipment specific standards from the temperature standard limit value Te(temperature standard limit value Te preset), if Tr>Te is false, then show that distribution loop conductor temperature is not out-of-limit, return step 1) and continue to detect distribution loop conductor temperature; If Tr>Te is true, then show that distribution loop conductor temperature is out-of-limit, start the threshold crossing time of bulk registration distribution loop conductor temperature and send alerting signal, now LCD pilot lamp 6 shows judgement output and warning message, LED emergency warning lamp 11 glimmers, and hummer 18 is reported to the police.Meanwhile, staff can according to accumulation threshold crossing time prediction conductor to thoroughly aging excess time.
In sum, the present invention dynamically can monitor the electricity consumption situation of distribution loop, and residual current, conductor temperature situation, according to load characteristic and the territorial environment characteristic of monitoring circuit, at different levels, residual current threshold value and temperature threshold values are freely set, complete distribution loop energy monitoring and residual current alarm, warning function, realize the monitoring of distribution loop Real time Efficiency, safety monitoring double shield.
The various embodiments described above are only for illustration of the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (3)
1. the monitoring method of an offshore power grid distribution end apparatus for monitoring energy resource, it comprises residual current monitoring method, the trend forecasting method of residual current and distribution loop conductor temperature detection method, it is characterized in that: described offshore power grid distribution end apparatus for monitoring energy resource comprises current transformer modulate circuit, quantitative analysis module, voltage modulate circuit and control module; The loop three-phase current of offshore power grid distribution end and loop residual current input in described quantitative analysis module after the process of described current transformer Circuit tuning; The loop three-phase voltage of offshore power grid distribution end also inputs in described quantitative analysis module after described voltage-regulating circuit process; Described quantitative analysis module calculates each phase according to the current value received and magnitude of voltage and closes all electrical parameters of phase, and this electrical parameter is read in described control module through SPI interface, described control module controls all electrical parameters received, and realizes the residual current to the offshore power grid distribution end energy, the monitoring of distribution loop conductor temperature and the trend prediction of residual current and analysis; Described control module comprises CPU, LCD pilot lamp, communication interface, input through keyboard module, switching input module, the first photoelectric isolating circuit, LED emergency warning lamp, the second photoelectric isolating circuit, switching value output module, external temperature sensor, clock module, ferroelectric memory, jtag interface and hummer; Described CPU, by after all electrical parameter process of receiving, shows result by described LCD pilot lamp, or connects background monitoring system by described communication interface and show; Described input through keyboard module is used for described CPU input of control commands; Described switching input module is used for described first photoelectric isolating circuit input switch status signal, and described first photoelectric isolating circuit suppresses the undesired signal in switch state signal, and inputs in described CPU by the switch state signal after process; By described LED emergency warning lamp, current switch amount state is shown simultaneously; Steering order is inputed to described CPU by described communication interface by background monitoring system, by described CPU through described second photoelectric isolating circuit to described switching value output module output switch amount signal, to control adhesive or the disconnection of external device relay; The distribution loop conductor temperature collected inputs in described CPU by described external temperature sensor, for monitoring distribution loop conductor temperature; Described clock module connects described CPU, for guaranteeing the simultaneity that electric current, voltage data gather; Described ferroelectric memory is for storing various data in described CPU with history of forming data; Described CPU, by described jtag interface Payload attach fitting, realizes carrying out compiling debugging and upgrading to described CPU internal program; Described hummer connects described CPU, for the output alarm information when breaking down;
Current transformer in described current transformer Circuit tuning adopts high permeability material;
Low-pass filter circuit, ADC and digital signal processor is provided with in described quantitative analysis module; Electric current, voltage signal after described low-pass filter circuit filtering high-frequency interferencing signal, input in described DSP through described ADC and process, obtain offshore power grid distribution end loop electrical parameter by described current transformer modulate circuit and voltage modulate circuit;
Preset four residual current forecast models in 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 models Ip=at
2+ bt+c; Wherein, Ip is residual current predicted value, and t is the time, and a, b, c are constant;
Described residual current monitoring method comprises the following steps:
1) the residual electricity flow valuve in current supply circuit is obtained in real time by current transformer modulate circuit;
2) by step 1) the residual current signal that obtains inputs to quantitative analysis module, and input after low-pass filter circuit process in ADC and carry out analog to digital conversion, obtain digital quantity residual current signal;
3) digital quantity residual current signal inputs in CPU after DSP process, and the residual current signal value after process 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, when Ir>Ie is true time, perform step 5), otherwise enter residual current monitoring method step 6);
5) outputting cutting breaks the signal of current supply circuit, and current supply circuit is cut off in the display of LCD pilot lamp, the flicker of LED emergency warning lamp correspondence;
6) judge the size of residual current actual value Ir and 0.5 times of residual current standard limit value Ie, if Ir>0.5Ie is true, warn alert signal, and by LCD indicating lamp display mode information, LED emergency warning lamp glimmers, buzzer warning; Otherwise, return residual current monitoring method step 1), proceed the monitoring of residual current;
The trend forecasting method of described residual current comprises the following steps:
1) choose 3 ~ 5 groups of data of continuously smooth in the residual current historical data (t, Ir) stored from ferroelectric memory, the data chosen are inputed in the linear model in CPU and obtain Ip=a
1+ b
1t, Ip are residual current predicted value, a
1, b
1for constant; By the following residual current data of Linear Model for Prediction obtained, and the residual current data of prediction and the actual data obtained are compared, obtain the average error △ E1 of linear model, preserve the function model of this average error and correspondence thereof;
2) according to the trend forecasting method step 1 with residual current) identical method chooses several groups of data of continuously smooth in historical data (t, Ir), and substitute in the power function model in CPU and obtain Ip=a
2t
b2+ c
2with the average error △ E2 of power function model; By the average error △ E2 of power function model and the trend forecasting method step 1 of residual current) in the average error △ E1 of linear model that obtains compare, preserve the function model of less average error and correspondence thereof;
3) according to the trend forecasting method step 1 with residual current) identical method, obtain logarithmic model Ip=a
3+ b
3lnt+c
3with the average error △ E3 of logarithmic model; And by the average error △ E3 of logarithmic model and the trend forecasting method step 2 of residual current) average error of preserving compares, and retains the function model of less average error and correspondence thereof;
4) according to the trend forecasting method step 1 with residual current) identical method obtains quadratic function models Ip=a
4t
2+ b
4t+c
4with the average error △ E4 of quadratic function models; With the trend forecasting method step 3 of residual current) in the average error of preserving compare, preserve the function model of less average error and correspondence thereof;
5) export the trend forecasting method step 4 of residual current) in the function model of the average error of preserving and correspondence thereof, and using this average error as the function model corresponding to standard error △ E, standard error △ E as selected function model;
6) self checking is carried out to selected function model at times, residual electricity flow valuve by function model prediction contrasts with actual residual electricity flow valuve, whether the error in judgement checking procedure is beyond standard error △ E, if beyond standard error △ E, return the trend forecasting method step 1 of residual current), re-start the screening of function model; Otherwise enter the trend forecasting method step 7 of residual current);
7) the trend forecasting method step 5 of residual current) in the function model that obtains by self checking, continue to utilize this function model to predict residual current.
2. the monitoring method of a kind of offshore power grid distribution end apparatus for monitoring energy resource as claimed in claim 1, is characterized in that: described step 1) in, the average error △ E1 of described linear model is:
△E1＝|Ip-Ir|。
3. the monitoring method of a kind of offshore power grid distribution end apparatus for monitoring energy resource as claimed in claim 1 or 2, is characterized in that: described distribution loop conductor temperature detection method comprises the following steps:
1) CPU obtains the distribution loop conductor temperature signal that distribution loop exterior temperature sensor collects in real time;
2) the distribution loop conductor temperature signal of acquisition is carried out analog to digital conversion by CPU, obtains the distribution loop conductor temperature of digital quantity, i.e. actual temperature value Tr;
3) the temperature standard limit value Te comparing actual temperature value Tr and preset, if Tr>Te is false, then shows that distribution loop conductor temperature is not out-of-limit, returns step 1) continue to detect distribution loop conductor temperature; If Tr>Te is true, then show that distribution loop conductor temperature is out-of-limit, start the threshold crossing time of bulk registration distribution loop conductor temperature and send alerting signal, now LCD pilot lamp display judges to export and warning message, LED emergency warning lamp glimmers, buzzer warning.
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| CN105067876A (en) * | 2015-08-12 | 2015-11-18 | 江苏省电力公司苏州供电公司 | Tail-end voltage qualified rate monitoring device |
| CN105070029A (en) * | 2015-08-12 | 2015-11-18 | 江苏省电力公司苏州供电公司 | Carrier meter reading module having voltage eligibility rate monitoring function |
| CN108152726A (en) * | 2017-12-18 | 2018-06-12 | 西安辰耀电气技术有限公司 | Monitor the intelligent electric instrument and high-tension switch cabinet of breaker mechanical state on-line |
| CN110366293B (en) * | 2017-12-28 | 2021-06-11 | 大道网络（上海）股份有限公司 | Intelligent lighting system and control method of console and console |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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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. |