Real-time monitoring method and system for operating power and open-circuit voltage of thermoelectric generator

Abstract

The invention discloses a thermoelectric generator operation power and open-circuit voltage real-time monitoring method and a thermoelectric generator operation power and open-circuit voltage real-time monitoring system. The real-time monitoring method for the running power of the thermoelectric generator comprises the following steps: connecting a load current detection loop and a load voltage detection loop between a wiring terminal of the thermoelectric generator and an RTU controller, and connecting an input control end of a solid-state relay with the RTU controller, the output controlled end of the solid-state relay is installed on a loop of a user load and a thermoelectric generator wiring terminal; when the switch of the output controlled end is closed, load current and load voltage signals detected in real time are sent to the RTU controller, and the RTU controller sends real-time output power to the pipeline dispatching control center according to the load current and the load voltage. The TEG operation output power can be remotely monitored on line in real time, real-time controllability of TEG operation is guaranteed, remote technical diagnosis can be carried out on the TEG, an explosion-proof box does not need to be frequently opened on site for parameter detection, and on-site workload is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation control, and in particular to a method and system for real-time monitoring of operating power and open-circuit voltage of a thermoelectric generator. Background Art

[0002] Thermoelectric technology is one of the best technologies for directly converting clean energy resources into electrical energy. Thermoelectric generator (TEG) uses the thermoelectric effect to directly convert waste heat into electrical energy. It uses the thermocouple principle to generate electricity. If the temperature difference between the two ends of the thermocouple is maintained continuously, it can output a certain power and provide electrical energy to the outside. It has the advantages of long service life, no noise and low maintenance requirements. In natural gas pipeline transportation, a TEG valve room is set up to be responsible for the power supply of the valve room communication system, RTU (Remote Terminal Unit) system, pipeline cathodic protection system and auxiliary systems in the valve room. The rated output power of TEG varies with conditions such as ambient temperature and wind speed. In order to meet the load operation requirements of the valve room, the TEG set power needs to be corrected in real time according to temperature and wind speed, etc. At the same time, the load may also change at any time. If the load resistance is equal to the equivalent internal resistance of the series thermocouple, the maximum electrical output power provided by TEG can be obtained. When the output voltage and the internal resistance of TEG exceed a certain range, it will cause a fault. Therefore, it is also necessary to monitor the open circuit voltage and internal resistance.

[0003] TEG should conduct power detection and TEG open circuit voltage test at least once a year. When conducting open circuit detection, the control reading time of open circuit detection should not exceed 3 seconds, and the open circuit time should not exceed 20 seconds, otherwise it will have serious consequences for the entire TEG system. As the TEG operation time increases, the frequency of power detection needs to be increased. Since the on-site TEG system itself does not have the online monitoring function, all the detection data need to be manually operated on-site. The accuracy of the detection is limited by the influence of manual technical proficiency, measurement tools, measurement methods and natural environment (rainy days, windy and sandy days). The efficiency is low and the cost is high. It cannot accurately monitor the operation status of TEG. In addition, the TEG valve room is built in the field. The on-site environment is harsh, with the lowest temperature of -41℃ and the highest temperature of 50℃. It is difficult to monitor manually in real time. In addition, the on-site test circuit of TEG is installed in the on-site explosion-proof box. Frequent manual opening of the explosion-proof box is not only a large workload, but also damages the safety of the explosion-proof box. Summary of the invention

[0004] In order to solve the above problems, the inventors have made the present invention, and through specific implementation methods, provide a method and system for real-time monitoring of the operating power and open-circuit voltage of a thermoelectric generator.

[0005] In a first aspect, an embodiment of the present invention provides a method for real-time monitoring of operating power of a thermoelectric generator, comprising the following steps:

[0006] Connect a load current detection circuit and a load voltage detection circuit between the thermoelectric generator terminal and the RTU controller, connect the input control end of the solid-state relay to the RTU controller, and install the output controlled end of the solid-state relay on the loop between the user load and the thermoelectric generator terminal;

[0007] When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller. Based on the load current and load voltage, the real-time output power of the thermoelectric generator is determined, and the RTU controller sends the real-time output power to the pipeline dispatching control center.

[0008] Specifically, the load current detection circuit includes a second voltage / current converter, a second surge protector and a second isolated safety gate, and the load voltage detection circuit includes a first voltage / current converter, a first surge protector and a first isolated safety gate.

[0009] Specifically, connecting a load current detection circuit and a load voltage detection circuit between the thermoelectric generator terminal and the RTU controller includes the following steps:

[0010] Connect the 6th and 7th terminals of the thermoelectric generator to the 9th and 7th terminals of the second voltage / current converter respectively, connect the 5th and 6th terminals of the second voltage / current converter to the 1st and 2nd terminals of the second surge protector respectively, connect the 3rd and 4th terminals of the second surge protector to the 1st and 2nd terminals of the second isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the second isolation type safety barrier to the RTU controller respectively.

[0011] Specifically, when the switch of the output controlled end is closed, before the load current and load voltage signals detected in real time are sent to the RTU controller, the following steps are included:

[0012] An open circuit voltage detection loop is connected between the thermoelectric generator terminals and the RTU controller to measure the open circuit voltage.

[0013] Specifically, the open circuit voltage detection loop includes a first voltage / current converter, a first surge protector and a first isolation safety barrier.

[0014] Specifically, an open circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller, including the following steps:

[0015] Connect the 4th and 6th terminals of the thermoelectric generator to the 9th and 7th terminals of the first voltage / current converter respectively, connect the 5th and 6th terminals of the first voltage / current converter to the 1st and 2nd terminals of the first surge protector respectively, connect the 3rd and 4th terminals of the first surge protector to the 1st and 2nd terminals of the first isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the first isolation type safety barrier to the RTU controller respectively.

[0016] Specifically, measuring the open circuit voltage includes the following steps:

[0017] The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first time length, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends a real-time open circuit voltage signal to the RTU controller, and the average value of the real-time open circuit voltage within the second time length is determined as the open circuit voltage. The first time length is greater than the second time length.

[0018] When the timing exceeds the first time period, the switch at the output controlled end of the solid-state relay closes the circuit between the user load and the thermoelectric generator terminal.

[0019] Specifically, when the switch of the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller, and the real-time output power of the thermoelectric generator is determined according to the load current and load voltage, including the following steps:

[0020] The load current detection circuit includes a first voltage / current converter and a second voltage / current converter, the real-time load voltage is obtained by the first voltage / current converter, the real-time load current is obtained by the second voltage / current converter, and the real-time load voltage and the real-time load current are respectively converted into 4 to 20mA analog signals, which are uploaded to the RTU controller;

[0021] When the real-time load voltage does not exceed the alarm value, the real-time load power of the thermoelectric generator is determined according to the real-time load voltage and the real-time load current.

[0022] Specifically, the method for real-time monitoring of the operating power of a thermoelectric generator further includes the following steps:

[0023] Configure the alarm intervals for open circuit voltage, internal resistance and real-time output power in the RTU system;

[0024] The internal resistance is determined by Rint=(Voc-VL) / I, where Rint is the internal resistance, Voc is the open circuit voltage, VL is the real-time load voltage, and I is the real-time load current;

[0025] When the open circuit voltage, internal resistance, or real-time output power enters the alarm range, check and repair the equipment.

[0026] In a second aspect, an embodiment of the present invention provides a real-time monitoring system for operating power of a thermoelectric generator.

[0027] The load current detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load current. The load voltage detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load voltage. When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller.

[0028] The solid-state relay is used to receive commands from the RTU controller to open or close the loop between the user load and the thermoelectric generator terminal. The input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal.

[0029] The RTU controller is connected to the pipeline dispatching control center for communication, and is used to determine the real-time output power of the thermoelectric generator according to the load current and load voltage, and send the real-time output power data to the pipeline dispatching control center.

[0030] In a third aspect, an embodiment of the present invention provides a method for real-time monitoring of an open-circuit voltage of a thermoelectric generator, comprising the following steps:

[0031] An open-circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller, an input control end of the solid-state relay is connected to the RTU controller, and an output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal;

[0032] The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first time length, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends a real-time open circuit voltage signal to the RTU controller, and the average value of the real-time open circuit voltage within the second time length is determined as the open circuit voltage. The first time length is greater than the second time length.

[0033] The RTU controller sends the open circuit voltage data to the pipeline dispatching control center.

[0034] In a fourth aspect, an embodiment of the present invention provides a real-time monitoring system for open-circuit voltage of a thermoelectric generator.

[0035] The open circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller to measure the open circuit voltage;

[0036] The solid-state relay is used to receive commands from the RTU controller to open or close the loop between the user load and the thermoelectric generator terminal. The input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal.

[0037] The RTU controller is connected to the pipeline dispatching control center for communication and is used to send open circuit voltage data to the pipeline dispatching control center.

[0038] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0039] The real-time monitoring scheme for the operating power of thermoelectric generators provided by the present invention can remotely monitor the operating output power of TEG in real time online, ensure the real-time controllability of TEG operation, provide direct data support for TEG technical maintenance, and can automatically collect parameters and realize remote data transmission in a universal host computer RTU, so that operating personnel can perform remote technical diagnosis of TEG in the pipeline control center without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the explosion-proof box on site.

[0040] The real-time monitoring solution for the open-circuit voltage of a thermoelectric generator provided by the present invention can remotely monitor the open-circuit voltage of the TEG in real time online, ensure the real-time controllability of the TEG operation, provide direct data support for the technical maintenance of the TEG, and can automatically collect parameters and control the open-circuit duration, and realize remote data transmission in a universal upper computer RTU, so that operating personnel can perform remote technical diagnosis of the TEG in the pipeline control center without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the explosion-proof box on site.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0042] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0044] Figure 1 This is a flow chart of a method for real-time monitoring of the operating power of a thermoelectric generator in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of a load current / load voltage detection circuit in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the thermoelectric generator terminal in an embodiment of the present invention;

[0047] Figure 4 This is a real-time monitoring flow chart in an embodiment of the present invention;

[0048] Figure 5 Flow chart of a method for real-time monitoring of open-circuit voltage of a thermoelectric generator in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method and system for real-time monitoring of operating power and open-circuit voltage of a thermoelectric generator.

[0051] The embodiment of the present invention provides a method for real-time monitoring of the operating power of a thermoelectric generator, the process of which is as follows: Figure 1 As shown, the following steps are included:

[0052] Step S1: connect a load current detection loop and a load voltage detection loop between the thermoelectric generator terminal and the RTU controller, connect the input control end of the solid-state relay to the RTU controller, and install the output controlled end of the solid-state relay on the loop between the user load and the thermoelectric generator terminal.

[0053] The 8550 TEG is composed of 325 thermocouples connected in series, each thermocouple outputs 87mV voltage, which can generate 28V / 21A output, and the power can reach 590 watts of electrical energy. Under standard conditions (at 20℃ and wind speed of 0 km / h), the rated output power of TEG is 550 watts, and its output power will change with the ambient temperature and wind speed. Therefore, in order to meet the operating requirements of the valve room load, it is necessary to make real-time corrections to the set power according to the environmental conditions, temperature, wind speed and other data. Changes in load, such as the use of valve room air conditioning in summer, will also cause significant changes in the load.

[0054] When the on-site pipeline is in operation all year round, TEG also operates uninterruptedly. In the operating performance of TEG, power is an important monitoring indicator. The change in power data can not only reflect the operating efficiency of TEG, but also adjust the natural gas flow rate of its gas supply according to the change in load power to achieve the requirements of energy reduction and efficiency improvement.

[0055] The solid-state relay is a four-terminal active device, two of which are input control terminals and the other two are output controlled terminals. The solid-state relay is an open circuit measurement time watchdog, which is controlled by the host computer RTU. Figure 2 As shown, the R1 solid-state relay acts as a conversion switch when measuring the open-circuit voltage. It is connected in series to the load power supply circuit, and the switch node selects the normally closed node S1. The power supply of its control circuit is sent by the RTU system. The signal is a pulse holding signal with a pulse duration of 28 seconds. When it exceeds 28 seconds, the selection command sent by the RTU is canceled and the solid-state relay node is restored. After receiving the selection command sent by the RTU, the control circuit is powered, the S1 node is disconnected, and the load power supply circuit is cut off. At this time, the RTU displays the open-circuit voltage. When the selection command disappears, the control circuit loses power, the S1 node is reset, and the load circuit is connected. At this time, the measured voltage is the load output voltage.

[0056] Although the current thermoelectric generator includes an RTU controller, which can be used for remote control, communication and calculation, the RTU controller is a host computer and does not have a real-time monitoring function for specific data such as output power and open-circuit voltage.

[0057] In some specific embodiments, RTU channel selection, parameter alarm value setting, average voltage calculation function block, TEG operation efficiency function module, and data upload module are set on the host computer RTU. Through automatic parameter collection and display on the industrial control host computer, the pipeline control center can perform remote technical diagnosis of the TEG. By setting the above-mentioned functional modules, the real-time display function of measurement parameters and measurement data in the industrial control system can be realized. The RTU channel selection module is used to set the same range as the device according to the model of the voltage signal conversion device. For example, when the output range of the voltage / current converter is 4 to 20 mA, the range of the RTU analog input channel is set to 4 to 20 mA, or a range of the same order of magnitude including 4 to 20 mA. The TEG operation efficiency function module is used to calculate the operation efficiency of the TEG: η=P out / Q in , where Q in It is the heat absorbed by the thermocouple after TEG natural gas combustion. in =V oc 2 / R int, Rint is the internal resistance, Voc is the open circuit voltage, and the operating status of TEG is monitored according to the real-time operating efficiency, and operation maintenance and repair production plans are formulated.

[0058] In some specific embodiments, the average voltage calculation function block is used to calculate the average value of all measured voltages during the measurement period within 3 seconds after the measurement starts. The calculation adopts a sampling period of 100 milliseconds, and the measured values ​​and calculated values ​​are first-in-first-out, that is, the measured values ​​and calculated values ​​are stored in chronological order and read in chronological order.

[0059] In some specific embodiments, in order to apply the host computer RTU in real-time power monitoring, a button for selecting a command is set in the RTU system, which controls the switching of the open circuit voltage and load voltage loops. When it is necessary to detect the open circuit voltage, click this button, and the RTU system will send a 28-second pulse signal to control the solid-state relay R1 coil and the S1 node to switch the two measurement loops.

[0060] In some specific embodiments, Figure 2 As shown, the load current detection circuit includes a second voltage / current converter (SD2), a second surge protector (SP2) and a second isolated safety gate (ZD2), and the load voltage detection circuit includes a first voltage / current converter (SD1), a first surge protector (SP1) and a first isolated safety gate (ZD1). Regarding the voltage / current converter, the output voltage of the TEG system can be up to 35V or less, and the on-site RTU control system does not have a corresponding measurement control channel and does not have the ability to directly receive such a high voltage signal. Therefore, the voltage signal can be converted into a standard 4-20mA analog signal through the device and uploaded to the RTU system. Conversion to a standard 4-20mA signal can avoid signal interference to the greatest extent for complex on-site application environments and is suitable for long-distance signal transmission. Since the signal detected on-site has been converted into a standard 4-20mA signal, the analog input channel can be selected in the RTU system, and the same range as the device can be set according to the model of the voltage signal conversion device. That is, by using voltage-to-current conversion equipment and detection circuits, an indirect detection method for higher voltages is implemented (converting voltages below 35V into 4-20mA currents), and remote data transmission is achieved in a general host computer RTU.

[0061] Regarding surge protectors and safety barriers, since the signal is transmitted from the outdoors to the RTU system in the valve room, in order to prevent damage to the control equipment due to thunderstorms, a surge protection device is added to the detection circuit. At the same time, as the TEG site is an explosion-proof area, the signal transmission needs to meet the explosion-proof requirements, so an isolation safety barrier device is added to the measurement circuit to prevent unsafe voltage and current from reaching the explosion-proof area.

[0062] In some specific embodiments, Figure 2 As shown, connecting a load current detection circuit and a load voltage detection circuit between the thermoelectric generator terminal and the RTU controller includes the following steps:

[0063] Connect the 6th and 7th terminals of the thermoelectric generator to the 9th and 7th terminals of the second voltage / current converter respectively, connect the 5th and 6th terminals of the second voltage / current converter to the 1st and 2nd terminals of the second surge protector respectively, connect the 3rd and 4th terminals of the second surge protector to the 1st and 2nd terminals of the second isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the second isolation type safety barrier to the RTU controller respectively.

[0064] Thermoelectric generator terminal blocks Figure 3 As shown, Figure 3 This is a schematic diagram of the TEG wiring terminals for model 8550-SD. Terminals 2 and 4 are load wiring terminals, terminals 4 and 6 are wiring terminals for detecting open circuit voltage, and terminals 6 and 7 are wiring terminals for detecting load current. For different models of TEG, you can select the corresponding terminals for loop connection according to the TEG manual.

[0065] In some specific embodiments, when the switch of the output controlled end is closed, before sending the load current and load voltage signals detected in real time to the RTU controller, the following steps are included:

[0066] An open circuit voltage detection loop is connected between the thermoelectric generator terminals and the RTU controller to measure the open circuit voltage.

[0067] In some specific embodiments, Figure 2 As shown, the open circuit voltage detection loop includes a first voltage / current converter, a first surge protector and a first isolation type safety barrier. Figure 2In the example, SD1 is a signal converter for detecting open circuit voltage and load voltage, SP1 is a surge protector, and ZD1 is a Zener safety barrier. When the S1 switch is closed, the measured value is the load voltage, and when the S1 switch is open, the detected voltage value is the open circuit voltage value. In this example, the voltage / current converter uses a DA-1317-D distribution isolator with an output signal of 4 to 20 mA. That is, the above circuit forms a load voltage detection loop when the S1 switch is closed, and forms an open circuit voltage detection loop when the S1 switch is open.

[0068] In some specific embodiments, Figure 2 As shown, an open circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller, including the following steps:

[0069] Connect the 4th and 6th terminals of the thermoelectric generator to the 9th and 7th terminals of the first voltage / current converter respectively, connect the 5th and 6th terminals of the first voltage / current converter to the 1st and 2nd terminals of the first surge protector respectively, connect the 3rd and 4th terminals of the first surge protector to the 1st and 2nd terminals of the first isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the first isolation type safety barrier to the RTU controller respectively.

[0070] In some specific embodiments, measuring the open circuit voltage includes the following steps:

[0071] The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first duration, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends the real-time open circuit voltage signal to the RTU controller, and the real-time open circuit voltage average value within the second duration is determined as the open circuit voltage. The first duration is greater than the second duration. For example, when it is necessary to measure the open circuit voltage, a command to measure the open circuit voltage is sent to the RTU, and the RTU system starts timing at the same time. After the solid-state relay receives the command and is energized, the output node of the solid-state relay acts, cuts off the load circuit, and opens the open circuit measurement circuit. The RTU displays the open circuit voltage, and displays the average voltage value of the measured voltage within the second duration of 3 seconds. When the first duration reaches 20 seconds, the RTU output signal disappears, the open circuit circuit is disconnected, the load circuit is connected, and the TEG system resumes external power supply. This device is to avoid the open circuit measurement time exceeding 20 seconds, which may cause damage to the TEG system. During the open circuit measurement, the backup UPS of the RTU system starts to supply power, ensuring the normal operation of the control system.

[0072] When the timing exceeds the first time period, the switch at the output controlled end of the solid-state relay closes the circuit between the user load and the thermoelectric generator terminal.

[0073] Step S2: When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller. The real-time output power of the thermoelectric generator is determined based on the load current and load voltage. The RTU controller sends the real-time output power to the pipeline dispatching control center.

[0074] The output voltage of TEG cannot exceed 35V. If it exceeds, the fuel gas must be shut off immediately. If the voltage is too low, it may be that the voltage limit setting value is wrong or the voltage limiter is faulty. Since TEG has internal resistance, the output voltage of TEG is greater than the load voltage.

[0075] In some specific embodiments, when the switch of the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller, and the real-time output power of the thermoelectric generator is determined according to the load current and load voltage, including the following steps:

[0076] The load current detection circuit includes a first voltage / current converter and a second voltage / current converter. The real-time load voltage is obtained through the first voltage / current converter, and the real-time load current is obtained through the second voltage / current converter. The real-time load voltage and the real-time load current are respectively converted into 4 to 20mA analog signals and uploaded to the RTU controller. Figure 2 As shown, SD1 is a voltage / current converter for detecting open circuit voltage and load voltage. When the S1 switch is closed, the measured value is the load voltage. When the S1 switch is open, the detected voltage value is the open circuit voltage value. SP1 is a surge protector, ZD1 is a Zener safety barrier, SD2 is a voltage / current converter for detecting load current, SP2 is a surge protector, and ZD2 is a Zener safety barrier. A detection resistor is also required in series in the load current detection loop.

[0077] When the real-time load voltage does not exceed the alarm value, the real-time load power of the thermoelectric generator is determined according to the real-time load voltage and the real-time load current.

[0078] The RTU controller sends the real-time output power to the pipeline dispatching control center, specifically including: after completing the programming of the control function module and the detection data processing in the RTU system, the open circuit voltage value, internal resistance value, load voltage value, and load current value are multiplied by 1000 respectively, and then uploaded to the pipeline dispatching control center in the form of double-byte integers according to the Modbus TCP protocol to ensure the accuracy of the uploaded data. Using the Modbus TCP protocol for data communication can fully guarantee the real-time nature of on-site production data, with the characteristics of small data delay and high data accuracy. And using network light for communication is convenient for remote data upload and easy system expansion. The pipeline dispatching control center implements remote monitoring, and adjusts the flow of self-used natural gas fuel gas according to the uploaded power value and voltage value, and then according to the needs of on-site power equipment. Adjust the flow of natural gas fuel gas in time according to the changes in load to achieve energy saving and efficiency improvement and reduce unnecessary gas emissions.

[0079] In some specific embodiments, the method for real-time monitoring of the operating power of a thermoelectric generator further includes the following steps:

[0080] Configure the alarm intervals for open circuit voltage, internal resistance and real-time output power in the RTU system;

[0081] The internal resistance is determined by Rint=(Voc-VL) / I, where Rint is the internal resistance, Voc is the open circuit voltage, VL is the real-time load voltage, and I is the real-time load current;

[0082] When the open circuit voltage, internal resistance, or real-time output power enters the alarm range, a corresponding alarm prompts the equipment to be inspected and repaired.

[0083] Among them, according to the on-site operation conditions and the model of the TEG equipment, the high alarm value and low alarm value of the voltage can be set, and the high alarm value and low alarm value can be set for the calculated output power. The system issues a corresponding alarm to prompt relevant personnel to perform timely maintenance. For example, the high alarm value of the open circuit voltage is set to 56.5 volts, the low alarm value of the internal resistance setting is set to 1.0 ohms, and the high alarm value is set to 1.4 ohms. The high and low alarm values ​​of the power change with the load power setting requirements of the TEG, and the high and low values ​​are not higher than the set power 10W and lower than the set power 10W respectively.

[0084] The real-time monitoring process of this embodiment is as follows Figure 4As shown, the RTU confirms the measurement of the open circuit voltage, and the RTU sends an open circuit voltage measurement command to the solid-state relay and starts timing. Within 20 seconds (first duration) of the RTU timing, the solid-state relay on the user load and the TEG loop is disconnected, the user load power supply is disconnected, and the open circuit voltage measurement begins. The first voltage / current converter (SD1) in the open circuit voltage detection loop measures the open circuit voltage, and the real-time open circuit voltage average value within the second duration of 3 seconds is determined as the open circuit voltage. After exceeding the first duration, the solid-state relay closes the user load and the TEG loop, the first voltage / current converter (SD1) measures the load voltage, and the second voltage / current converter (SD2) measures the load current. Based on the load current and load voltage, the RTU calculates the output power P out , calculate the internal resistance Rint according to the open circuit voltage and load voltage. When the open circuit voltage Voc, or the internal resistance Rint, or the real-time output power P out , or when the load voltage VL enters the alarm range, a corresponding alarm prompt is issued to inspect and repair the equipment.

[0085] In the above method of this embodiment, the real-time monitoring scheme for the operating power of the thermoelectric generator provided by the present invention can remotely and real-time monitor the operating output power of the TEG online, ensure the real-time controllability of the TEG operation, provide direct data support for the technical maintenance of the TEG, and can automatically collect parameters and realize remote data transmission in the general host computer RTU, so that the operating personnel can perform remote technical diagnosis of the TEG in the pipeline control center, without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the on-site explosion-proof box.

[0086] Those skilled in the art can change the above sequence without departing from the protection scope of the present disclosure.

[0087] Another embodiment of the present invention provides a real-time monitoring system for the operating power of a thermoelectric generator, wherein a load current detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load current, and a load voltage detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load voltage. When the switch of the output controlled end is closed, the load current and load voltage signals detected in real time are sent to the RTU controller;

[0088] The solid-state relay is used to receive commands from the RTU controller to open or close the loop between the user load and the thermoelectric generator terminal. The input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal.

[0089] The RTU controller is connected to the pipeline dispatching control center for communication, and is used to determine the real-time output power of the thermoelectric generator according to the load current and load voltage, and send the real-time output power data to the pipeline dispatching control center.

[0090] Regarding the system in the above embodiment, its specific implementation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0091] In this embodiment, the real-time monitoring scheme for the operating power of the thermoelectric generator provided by the present invention can remotely and real-time monitor the operating output power of the TEG online, ensure the real-time controllability of the TEG operation, provide direct data support for the technical maintenance of the TEG, and can automatically collect parameters and realize remote data transmission in the general host computer RTU, so that the operating personnel can perform remote technical diagnosis of the TEG in the pipeline control center, without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the on-site explosion-proof box.

[0092] Another embodiment of the present invention provides a method for real-time monitoring of the open-circuit voltage of a thermoelectric generator. Figure 5 As shown, the following steps are included:

[0093] An open-circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller, an input control end of the solid-state relay is connected to the RTU controller, and an output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal;

[0094] The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first time length, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends a real-time open circuit voltage signal to the RTU controller, and the average value of the real-time open circuit voltage within the second time length is determined as the open circuit voltage. The first time length is greater than the second time length.

[0095] The RTU controller sends the open circuit voltage data to the pipeline dispatching control center.

[0096] In this embodiment, the real-time monitoring solution for the open-circuit voltage of the thermoelectric generator provided by the present invention can remotely monitor the TEG open-circuit voltage online in real time, ensure the real-time controllable operation of the TEG, provide direct data support for TEG technical maintenance, and can automatically collect parameters, control the open circuit duration, and realize remote data transmission in the general host computer RTU, so that operating personnel can perform remote technical diagnosis of the TEG in the pipeline control center, without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the on-site explosion-proof box.

[0097] Another embodiment of the present invention provides a real-time monitoring system for the open-circuit voltage of a thermoelectric generator, wherein the open-circuit voltage detection circuit is connected between the thermoelectric generator terminal and the RTU controller for measuring the open-circuit voltage; the solid-state relay is used to receive commands from the RTU controller to open or close the circuit between the user load and the thermoelectric generator terminal, the input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the circuit between the user load and the thermoelectric generator terminal; the RTU controller is communicatively connected to the pipeline scheduling control center for sending open-circuit voltage data to the pipeline scheduling control center.

[0098] In this embodiment, the real-time monitoring solution for the open-circuit voltage of the thermoelectric generator provided by the present invention can remotely monitor the TEG open-circuit voltage online in real time, ensure the real-time controllable operation of the TEG, provide direct data support for TEG technical maintenance, and can automatically collect parameters, control the open circuit duration, and realize remote data transmission in the general host computer RTU, so that operating personnel can perform remote technical diagnosis of the TEG in the pipeline control center, without having to frequently open the explosion-proof box on site for parameter detection, thereby reducing the workload on site and protecting the explosion-proof performance of the on-site explosion-proof box.

[0099] Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention shall still fall within the patent scope of the present invention.

[0100] The "connection" mentioned above, unless otherwise stated, indicates a logical relationship of current transmission, and does not necessarily indicate a direct electrical connection. At the same time, "first", "second", etc. do not indicate a sequence, but are only used to identify related devices, etc. The present invention is not limited to the above voltage and current levels, which are only the voltage and current levels in the embodiments.

Claims

1. A method for real-time monitoring of the operating power of a thermoelectric generator, characterized in that: The following steps are involved: Connect a load current detection circuit and a load voltage detection circuit between the thermoelectric generator terminal and the RTU controller, connect the input control end of the solid-state relay to the RTU controller, and install the output controlled end of the solid-state relay on the loop between the user load and the thermoelectric generator terminal; When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller. Based on the load current and load voltage, the real-time output power of the thermoelectric generator is determined, and the RTU controller sends the real-time output power to the pipeline dispatching control center.

2. The method according to claim 1, characterized in that The load current detection circuit includes a second voltage / current converter, a second surge protector and a second isolated safety gate, and the load voltage detection circuit includes a first voltage / current converter, a first surge protector and a first isolated safety gate.

3. The method according to claim 1, characterized in that Connecting a load current detection circuit and a load voltage detection circuit between the thermoelectric generator terminal and the RTU controller includes the following steps: Connect the 6th and 7th terminals of the thermoelectric generator to the 9th and 7th terminals of the second voltage / current converter respectively, connect the 5th and 6th terminals of the second voltage / current converter to the 1st and 2nd terminals of the second surge protector respectively, connect the 3rd and 4th terminals of the second surge protector to the 1st and 2nd terminals of the second isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the second isolation type safety barrier to the RTU controller respectively.

4. The method according to claim 1, characterized in that When the switch at the output controlled end is closed, before sending the real-time detected load current and load voltage signals to the RTU controller, the following steps are included: An open circuit voltage detection loop is connected between the thermoelectric generator terminals and the RTU controller to measure the open circuit voltage.

5. The method according to claim 4, characterized in that The open circuit voltage detection loop includes a first voltage / current converter, a first surge protector and a first isolation safety barrier.

6. The method according to claim 4, characterized in that Connecting an open circuit voltage detection loop between the thermoelectric generator terminal and the RTU controller includes the following steps: Connect the 4th and 6th terminals of the thermoelectric generator to the 9th and 7th terminals of the first voltage / current converter respectively, connect the 5th and 6th terminals of the first voltage / current converter to the 1st and 2nd terminals of the first surge protector respectively, connect the 3rd and 4th terminals of the first surge protector to the 1st and 2nd terminals of the first isolation type safety barrier respectively, and connect the 3rd and 4th terminals of the first isolation type safety barrier to the RTU controller respectively.

7. The method according to claim 4, characterized in that Measuring the open circuit voltage includes the following steps: The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first time length, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends a real-time open circuit voltage signal to the RTU controller, and the average value of the real-time open circuit voltage within the second time length is determined as the open circuit voltage. The first time length is greater than the second time length. When the timing exceeds the first time period, the switch at the output controlled end of the solid-state relay closes the circuit between the user load and the thermoelectric generator terminal.

8. The method according to claim 1, characterized in that When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller, and the real-time output power of the thermoelectric generator is determined according to the load current and load voltage, including the following steps: The load current detection circuit includes a first voltage / current converter and a second voltage / current converter, the real-time load voltage is obtained by the first voltage / current converter, the real-time load current is obtained by the second voltage / current converter, and the real-time load voltage and the real-time load current are respectively converted into 4 to 20mA analog signals, which are uploaded to the RTU controller; When the real-time load voltage does not exceed the alarm value, the real-time load power of the thermoelectric generator is determined according to the real-time load voltage and the real-time load current.

9. The method according to any one of claims 1 to 8, characterized in that: The method for real-time monitoring of the operating power of a thermoelectric generator further comprises the following steps: Configure the alarm intervals for open circuit voltage, internal resistance and real-time output power in the RTU system; The internal resistance is determined by Rint=(Voc-VL) / I, where Rint is the internal resistance, Voc is the open circuit voltage, VL is the real-time load voltage, and I is the real-time load current; When the open circuit voltage, internal resistance, or real-time output power enters the alarm range, check and repair the equipment.

10. A real-time monitoring system for the operating power of a thermoelectric generator, characterized in that: The load current detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load current. The load voltage detection circuit is connected between the thermoelectric generator terminal and the RTU controller to measure the load voltage. When the switch at the output controlled end is closed, the real-time detected load current and load voltage signals are sent to the RTU controller. The solid-state relay is used to receive commands from the RTU controller to open or close the loop between the user load and the thermoelectric generator terminal. The input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal. The RTU controller is connected to the pipeline dispatching control center for communication, and is used to determine the real-time output power of the thermoelectric generator according to the load current and load voltage, and send the real-time output power data to the pipeline dispatching control center.

11. A method for real-time monitoring of open-circuit voltage of a thermoelectric generator, characterized in that: The following steps are involved: An open-circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller, an input control end of the solid-state relay is connected to the RTU controller, and an output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal; The RTU controller sends an open circuit measurement command to the solid-state relay and starts timing. The switch at the output controlled end of the solid-state relay cuts off the circuit between the user load and the thermoelectric generator terminal. When the timing does not exceed the first time length, the circuit between the user load and the thermoelectric generator terminal remains disconnected. The open circuit voltage detection circuit sends a real-time open circuit voltage signal to the RTU controller, and the average value of the real-time open circuit voltage within the second time length is determined as the open circuit voltage. The first time length is greater than the second time length. The RTU controller sends the open circuit voltage data to the pipeline dispatching control center.

12. A real-time monitoring system for open-circuit voltage of a thermoelectric generator, characterized in that: The open circuit voltage detection loop is connected between the thermoelectric generator terminal and the RTU controller to measure the open circuit voltage; The solid-state relay is used to receive commands from the RTU controller to open or close the loop between the user load and the thermoelectric generator terminal. The input control end of the solid-state relay is connected to the RTU controller, and the output controlled end of the solid-state relay is installed on the loop between the user load and the thermoelectric generator terminal. The RTU controller is connected to the pipeline dispatching control center for communication and is used to send open circuit voltage data to the pipeline dispatching control center.

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