CN214900211U - Power generation internet device applied to natural air pressure difference - Google Patents
Power generation internet device applied to natural air pressure difference Download PDFInfo
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- CN214900211U CN214900211U CN202121530950.7U CN202121530950U CN214900211U CN 214900211 U CN214900211 U CN 214900211U CN 202121530950 U CN202121530950 U CN 202121530950U CN 214900211 U CN214900211 U CN 214900211U
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- 238000010248 power generation Methods 0.000 title claims description 54
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000003345 natural gas Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 37
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- 230000001276 controlling effect Effects 0.000 claims abstract description 11
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- 238000012544 monitoring process Methods 0.000 claims description 7
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- 230000006837 decompression Effects 0.000 abstract 1
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- 230000006855 networking Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
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Abstract
The application discloses be applied to electricity generation internet device of natural atmospheric pressure difference includes: the turbine expander is arranged in the natural gas differential pressure power station and used for collecting target energy released by natural gas in the decompression conveying process; an engine for converting a target energy into an electric energy; the PWM rectifier is used for regulating and controlling the rotating speed of the generator according to the power instruction output by the turbine expansion machine so as to convert the energy output by the generator into target direct current; the energy leakage circuit is used for regulating and controlling the target direct current so as to keep the target direct current within a preset range; and the PWM inverter is used for converting the target direct current into the target alternating current so as to enable the natural gas differential pressure power station to be connected with a target power grid in a grid mode. Obviously, through the electricity generation network access device that this application provided just can carry out high-efficient utilization to the energy of natural gas in the transportation process that steps down, just avoided the energy waste of natural gas in the transportation process that steps down from this.
Description
Technical Field
The utility model relates to a natural gas technology field, in particular to be applied to the electricity generation internet surfing device of natural atmospheric pressure difference.
Background
Natural gas is a novel clean, low-carbon fossil energy source and has been widely used in daily life. In order to ensure the safety and reliability of natural gas in the transmission process, the natural gas is generally conveyed by adopting a step-by-step depressurization mode, that is, the natural gas pipeline network is generally divided into a national pipeline network, a provincial pipeline network and an urban pipeline network, and then the natural gas is conveyed to various places through the national pipeline, the provincial pipeline and the urban pipeline in sequence for use.
However, such a depressurization transportation method of natural gas has a great waste of energy, and no device capable of utilizing energy generated in the transportation process of natural gas has been developed in the prior art, and the problem needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a be applied to the poor electricity generation internet device of natural gas pressure to carry out high-efficient the utilization to the energy of natural gas in the transportation process that steps down, and avoid the energy waste of natural gas in the transportation process that steps down. The specific scheme is as follows:
the utility model provides a be applied to electricity generation internet device of natural atmospheric pressure difference, includes:
the turbine expander is arranged in the natural gas differential pressure power station and used for collecting target energy released by natural gas in the depressurization conveying process;
a generator connected to the turboexpander for converting the target energy into electrical energy;
the PWM rectifier is connected with the generator and used for regulating and controlling the rotating speed of the generator according to the power instruction output by the turbine expansion machine so as to convert the energy output by the generator into target direct current;
the energy leakage circuit is connected with the PWM rectifier and used for regulating and controlling the target direct current so as to keep the target direct current within a preset range;
and the PWM inverter is connected with the PWM rectifier and is used for converting the target direct current into target alternating current so as to enable the natural gas pressure difference power station to be connected with a target power grid in a grid mode.
Preferably, the PWM rectifier and the PWM inverter are both a three-phase half-bridge two-level topology.
Preferably, the method further comprises the following steps:
and the filter is connected with the PWM inverter and is used for filtering out higher harmonics in the target alternating current.
Preferably, the filter is an LC low-pass filter.
Preferably, the method further comprises the following steps:
and the soft start circuit is connected with the PWM inverter and is used for adjusting the voltage of the target direct current to a preset voltage when the PWM inverter converts the target direct current into the target alternating current.
Preferably, the PWM rectifier is connected with the generator through a hard contact, and the PWM rectifier is communicated with the natural gas pressure difference power station through a Modbus TCP.
Preferably, the method further comprises the following steps:
and the rectifier control and protection module is used for acquiring a first operation parameter of the PWM rectifier and protecting the PWM rectifier according to the first operation parameter.
Preferably, the method further comprises the following steps:
and the inverter control and protection module is used for acquiring a second operation parameter of the PWM inverter and protecting the PWM inverter according to the second operation parameter.
Preferably, the method further comprises the following steps:
and the monitoring system is connected with the rectifier control and protection module and the inverter control and protection module and is used for displaying the first operating parameter and the second operating parameter and controlling the operating states of the PWM rectifier and the PWM inverter according to the first operating parameter and the second operating parameter.
Therefore, in the power generation internet device provided by the utility model, firstly, a turbine expander is arranged in the natural gas pressure difference power station, so that the turbine expander is utilized to collect the target energy released by the natural gas in the pressure reduction conveying process; then, the generator converts the target energy collected by the turboexpander into electric energy, and in the process, the PWM rectifier regulates and controls the rotating speed of the generator according to a power instruction output by the turboexpander so as to convert the energy output by the generator into target direct current; in addition, in order to ensure the stability of the power generation internet access device in the operation process, the energy leakage circuit can regulate and control the target direct current output by the PWM rectifier so as to keep the target direct current within a preset range; and finally, the PWM inverter can convert the target direct current output by the PWM rectifier into target alternating current so that the natural gas pressure difference power station can be connected with a target power grid in a grid mode. Obviously, through the utility model provides a net device is gone up in electricity generation just can carry out high-efficient the utilization to the energy of natural gas in the step-down transportation process, has just avoided the energy waste of natural gas in the step-down transportation process from this.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of a power generation internet access device applied to natural gas pressure difference according to an embodiment of the present invention;
fig. 2 is a structural diagram of an energy discharging circuit according to an embodiment of the present invention;
fig. 3 is a structural diagram of another power generation internet access device applied to natural gas pressure difference according to an embodiment of the present invention.
Fig. 4 is a schematic view of communication between modules in a power generation internet access device applied to natural gas pressure difference according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1, fig. 1 is a structural diagram of a power generation internet access device applied to natural gas pressure difference according to an embodiment of the present invention, the power generation internet access device includes:
the turbine expander 11 is arranged in the natural gas differential pressure power station and used for collecting target energy released by natural gas in the depressurization conveying process;
a generator 12 connected to the turboexpander 11 for converting the target energy into electric energy;
the PWM rectifier 13 is connected with the generator 12 and used for regulating and controlling the rotating speed of the generator 12 according to the power instruction output by the turbine expansion machine 11 so as to convert the energy output by the generator 12 into target direct current;
the energy leakage circuit 14 is connected with the PWM rectifier 13 and used for regulating and controlling the target direct current so as to keep the target direct current within a preset range;
and the PWM inverter 15 is connected with the PWM rectifier 13 and is used for converting the target direct current into target alternating current so as to enable the natural gas pressure difference power station to be connected with a target power grid in a grid mode.
In this embodiment, a power generation networking device applied to natural gas pressure difference is provided, through this power generation networking device, the energy of natural gas in the step-down transportation process can be efficiently utilized, and the energy waste of natural gas in the step-down transportation process is avoided.
Specifically, when the turbo expander 11 collects the target energy released by the natural gas during the depressurization transportation process, the turbo expander 11 transmits the collected target energy to the generator 12, and converts the target energy into electric energy through the generator 12. Meanwhile, the PWM rectifier 13 regulates the rotation speed of the generator 12 according to the power command output from the turboexpander 11, and converts the energy output from the generator 12 into the target dc power. After the PWM rectifier 13 converts the energy output by the generator 12 into the target dc power, the energy discharging circuit 14 regulates and controls the target dc power output by the PWM rectifier 13 so that the target dc power output by the PWM rectifier 13 is kept within a preset range, and meanwhile, the PWM inverter 15 converts the target dc power into the target ac power.
In the power generation networking device, the energy leakage circuit 14 can improve the safety and reliability of the whole power generation networking device in the operation process, and prevent the power generation networking device from damaging the power generator 12 after the power generation networking device fails to balance the power capacity. That is, the energy release circuit 14 is added to the power generation network device, so that the power generation network device can control the switching-in load after the energy balance control fails, or the generator 12 is protected when the generator 12 is turned off. Referring to fig. 2, fig. 2 is a structural diagram of an energy release circuit according to an embodiment of the present invention, in fig. 2, R is an energy release resistor, and S is an energy release control switch. Through repeated switching of the energy leakage control switch S on the energy leakage resistor R, redundant impact power in the system can be consumed, and therefore stable operation of the power generation internet access device is guaranteed.
It is conceivable that, after the PWM inverter 15 converts the target direct current into the target alternating current, the target alternating current can be input into the target power grid, in which case the natural gas pressure difference power plant is connected to the target power grid. Compare in prior art, through the electricity generation internet access device that this embodiment provided, just can avoid the natural gas in the extravagant phenomenon of the energy that the step-down transportation in-process appears, improvement that from this just can be very big to the utilization ratio of natural gas.
It can be seen that, in the power generation network device provided in this embodiment, a turbine expander is first arranged in a natural gas differential pressure power station, so as to collect target energy released by natural gas in a pressure reduction conveying process by using the turbine expander; then, the generator converts the target energy collected by the turboexpander into electric energy, and in the process, the PWM rectifier regulates and controls the rotating speed of the generator according to a power instruction output by the turboexpander so as to convert the energy output by the generator into target direct current; in addition, in order to ensure the stability of the power generation internet access device in the operation process, the energy leakage circuit can regulate and control the target direct current output by the PWM rectifier so as to keep the target direct current within a preset range; and finally, the PWM inverter can convert the target direct current output by the PWM rectifier into target alternating current so that the natural gas pressure difference power station can be connected with a target power grid in a grid mode. Obviously, the power generation internet access device provided by the embodiment can efficiently utilize the energy of the natural gas in the depressurization conveying process, so that the energy waste of the natural gas in the depressurization conveying process is avoided.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 3, and fig. 3 is a structural diagram of another power generation internet access device applied to natural gas pressure difference according to the embodiment of the present invention. In a preferred embodiment, the PWM rectifier and the PWM inverter are both three-phase half-bridge two-level topologies.
Specifically, in the present embodiment, both the PWM rectifier and the PWM inverter are set to be a three-phase half-bridge two-level topology, and because the number of switching tubes used in the three-phase half-bridge two-level topology is small, the safety and stability of the PWM rectifier and the PWM inverter during the operation process can be relatively improved by such a setting manner.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 3, and fig. 3 is a structural diagram of another power generation internet access device applied to natural gas pressure difference according to the embodiment of the present invention. As a preferred embodiment, the power generation internet access device further includes:
and the filter is connected with the PWM inverter and is used for filtering out higher harmonics in the target alternating current.
It can be understood that, because the power generation network device generally adopts a PWM pulse width modulation method to rectify the energy output by the generator, the target alternating current contains more higher harmonics, and the higher harmonics not only increase the power loss of the power generation network device, but also damage the PWM inverter.
Therefore, in the present embodiment, in order to avoid the above situation, a filter is used to filter out the higher harmonics in the target ac power, so as to further improve the safety and reliability of the grid-connected power generation device during the use process.
As a preferred embodiment, the filter is embodied as an LC low-pass filter.
Because the LC low-pass filter has the advantages of stable and reliable performance, small volume, light weight and the like compared with other types of filters, when the filter is set as the LC low-pass filter, the occupancy of the power generation network device for the space volume can be relatively reduced.
In setting the LC low-pass filter, it is necessary to give priority to the cutoff frequency of the LC low-pass filter because most harmonics higher than the cutoff frequency in the PWM inverter output voltage can be eliminated by the cutoff frequency. In addition, when setting the design parameters of the LC low-pass filter, in addition to the reference factor of the cutoff frequency, the influence of the parameters such as the power capacity and the volume of the LC low-pass filter on the power density, the weight and the cost performance of the power generation grid device needs to be comprehensively considered.
In addition, the design parameters of the LC low-pass filter also need to comprehensively consider factors such as the power level, the ac frequency, and the switching frequency of the power generation grid-connected device. The inductance in the LC low-pass filter is mainly determined by the inductance current ripple, and the current ripple is generally 10% to 20% of the rated current. Specifically, in the present embodiment, the inductance in the LC low-pass filter and the current ripple have the following relationship:
in the formula of UgL-LmaxIs the effective value of the target grid line voltage, fsFor switching frequency, Δ iLIs the ac side inductor ripple current.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 3, and fig. 3 is a structural diagram of another power generation internet access device applied to natural gas pressure difference according to the embodiment of the present invention. As a preferred embodiment, the power generation internet access device further includes:
and the soft start circuit is connected with the PWM inverter and is used for adjusting the voltage of the target direct current to a preset voltage when the PWM inverter converts the target direct current into the target alternating current.
It can be understood that, when the PWM inverter charges the target dc power to the rated voltage value, a large start current is usually generated, so in this embodiment, in order to avoid a trip phenomenon caused by an excessively large start charging current, a soft start circuit is further provided in the power generation network device, and when the PWM inverter converts the target dc power to the target ac power, the soft start circuit is used to adjust the voltage of the target dc power to a preset voltage.
Obviously, the technical scheme provided by the embodiment can further ensure the safety of the power generation internet access device in the using process.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, as a preferred implementation, the PWM rectifier is connected to the generator through a hard contact, and the PWM rectifier communicates with the natural gas pressure difference power station through a Modbus TCP.
Specifically, in the power generation network device, the PWM rectifier and the engine are connected by hard contacts, because the connection between the PWM rectifier and the engine not only enables stable and reliable transmission of signals between the engine and the PWM rectifier, but also relatively reduces the probability of failure.
In addition, the PWM rectifier communicates with the natural gas pressure difference power station through the Modbus TCP, and the Modbus TCP is a standard and open communication protocol and is widely applied to the technical field of transformer substations, so that the universality of the power generation internet access device in practical application can be relatively improved. In addition, the communication protocol also has the advantages of simple and compact data transmission format, so that when the PWM rectifier is communicated with the natural gas pressure difference power station through the Modbus TCP, the convenience of the power generation internet access device in the use process can be relatively improved.
Based on the foregoing embodiment, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the power generation internet access device further includes:
and the rectifier control and protection module is used for acquiring a first operation parameter of the PWM rectifier and protecting the PWM rectifier according to the first operation parameter.
And the inverter control and protection module is used for acquiring a second operation parameter of the PWM inverter and protecting the PWM inverter according to the second operation parameter.
It can be understood that, in practical applications, because a large number of electrical devices are disposed in the grid-connected power generation device, the PWM rectifier and the PWM inverter may encounter overvoltage, overcurrent, surge and the like during operation, and when the PWM rectifier and the PWM inverter encounter the above situations, the grid-connected power generation device may be damaged seriously.
Therefore, in this embodiment, in order to avoid the above situation, a rectifier control and protection device and an inverter control and protection device are provided in the power generation grid, so as to further ensure the safety and reliability of the power generation grid device in the operation process.
As a preferred embodiment, the power generation internet access device further includes:
and the monitoring system is connected with the rectifier control and protection module and the inverter control and protection module and is used for displaying the first operating parameter and the second operating parameter and controlling the operating states of the PWM rectifier and the PWM inverter according to the first operating parameter and the second operating parameter.
In this embodiment, a monitoring system is further disposed in the power generation internet access device, specifically please refer to fig. 4, and fig. 4 is a schematic view of communication between modules in the power generation internet access device applied to natural air pressure difference according to an embodiment of the present invention. In the operation process of the power generation network device, the monitoring system can not only display the first operation parameter of the PMW rectifier and the second operation parameter of the PMW inverter, but also control the operation states of the PWM rectifier and the PWM inverter according to the first operation parameter of the PWM rectifier and the second operation parameter of the PWM inverter.
Obviously, in the setting mode, the working personnel can more clearly and intuitively check the operation data of the PWM rectifier and the PM inverter through the monitoring system, and when the PWM rectifier and the PWM inverter are abnormal or have faults, the working personnel can also regulate and control and correct the operation states of the PWM rectifier and the PMW inverter through the monitoring system, so that the user experience of people when using the power generation internet access device can be further improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides a be applied to electricity generation internet device of natural atmospheric pressure difference which characterized in that includes:
the turbine expander is arranged in the natural gas differential pressure power station and used for collecting target energy released by natural gas in the depressurization conveying process;
a generator connected to the turboexpander for converting the target energy into electrical energy;
the PWM rectifier is connected with the generator and used for regulating and controlling the rotating speed of the generator according to the power instruction output by the turbine expansion machine so as to convert the energy output by the generator into target direct current;
the energy leakage circuit is connected with the PWM rectifier and used for regulating and controlling the target direct current so as to keep the target direct current within a preset range;
and the PWM inverter is connected with the PWM rectifier and is used for converting the target direct current into target alternating current so as to enable the natural gas pressure difference power station to be connected with a target power grid in a grid mode.
2. The grid-connection capable of generating power of claim 1, wherein the PWM rectifier and the PWM inverter are both three-phase half-bridge two-level topologies.
3. The power generation internet device of claim 1, further comprising:
and the filter is connected with the PWM inverter and is used for filtering out higher harmonics in the target alternating current.
4. A power generation grid device according to claim 3, wherein the filter is in particular an LC low pass filter.
5. The power generation internet device of claim 1, further comprising:
and the soft start circuit is connected with the PWM inverter and is used for adjusting the voltage of the target direct current to a preset voltage when the PWM inverter converts the target direct current into the target alternating current.
6. The power generation internet device according to claim 1, wherein the PWM rectifier is connected with the generator through hard contacts, and the PWM rectifier is communicated with the natural gas pressure difference power station through a Modbus TCP.
7. The power generation internet device according to any one of claims 1 to 6, further comprising:
and the rectifier control and protection module is used for acquiring a first operation parameter of the PWM rectifier and protecting the PWM rectifier according to the first operation parameter.
8. The power generation internet device of claim 7, further comprising:
and the inverter control and protection module is used for acquiring a second operation parameter of the PWM inverter and protecting the PWM inverter according to the second operation parameter.
9. The power generation internet device of claim 8, further comprising:
and the monitoring system is connected with the rectifier control and protection module and the inverter control and protection module and is used for displaying the first operating parameter and the second operating parameter and controlling the operating states of the PWM rectifier and the PWM inverter according to the first operating parameter and the second operating parameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121530950.7U CN214900211U (en) | 2021-07-06 | 2021-07-06 | Power generation internet device applied to natural air pressure difference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121530950.7U CN214900211U (en) | 2021-07-06 | 2021-07-06 | Power generation internet device applied to natural air pressure difference |
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| CN214900211U true CN214900211U (en) | 2021-11-26 |
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