Semi-off-grid micro-grid integrated energy system

Abstract

The invention discloses a semi-off-grid micro-grid integrated energy system, and relates to the field of oil field load power supply, the disclosed system comprises a power grid interface, a power supply device, a rectification module and a new energy device, the rectification module is connected with the power grid interface, the power supply device and a load of an oil field load scene, and the new energy device is connected with the rectification module. The power grid interface is connected with a power grid, the rectification module is disconnected with the power grid interface and connected with power supply equipment when the power grid breaks down, the power supply equipment is used for sending a first alternating current signal to the rectification module, and the rectification module is connected with the new energy equipment when the power grid breaks down or the generated power of the new energy equipment does not meet load operation rated power. And receiving a first alternating current signal output by the power supply equipment, rectifying the first alternating current signal into a direct current bus signal, and sending the direct current bus signal to the load through a direct current bus to provide stable power supply for the load. Compared with the prior art, by establishing the AC-DC coupling micro-grid, the conversion links are reduced, the loss is reduced, and the electric energy utilization rate is improved.

Description

Technical Field

[0001] This application relates to the field of oilfield load power supply technology, and in particular to a semi-off-grid microgrid integrated energy system. Background Technology

[0002] Hybrid AC / DC microgrids fully utilize the advantages of both AC and DC power supply, rationally distributing AC and DC distributed power sources and loads, minimizing intermediate conversion stages (DC / AC or AC / DC), and improving microgrid system efficiency. The two heterogeneous AC and DC subgrids are connected via interconnecting converters to achieve mutual conversion and support between AC and DC power. The entire hybrid AC / DC microgrid is connected to the main grid on the AC subgrid side through a PCC (Point of Common Connection). When the main grid fails or the hybrid microgrid is planned to be islanded, the PCC point disconnects, and the hybrid microgrid disconnects from the main grid and enters islanded mode.

[0003] Currently, there is no design for a comprehensive energy system of AC / DC coupled semi-off-grid microgrids for oilfield scenarios. This results in low power utilization rates in oilfield production bases with various types of DC power sources and loads, large power losses due to multiple conversion links, and high equipment investment and operating costs. In the event of AC grid failure in edge weak grid scenarios, oilfield microgrids cannot provide stable support. Summary of the Invention

[0004] The main purpose of this application is to provide a semi-off-grid microgrid integrated energy system, which aims to solve the technical problem of low power utilization rate in oilfield production bases with various types of DC power sources and loads, and the inability of oilfield microgrids to provide stable support.

[0005] To achieve the above objectives, this application proposes a semi-off-grid microgrid integrated energy system, which is applied in an oilfield setting. The semi-off-grid microgrid integrated energy system includes: a grid interface, power supply equipment, a rectifier module, and new energy equipment.

[0006] The rectifier module is connected to the power grid interface, the power supply equipment, and the load of the oilfield load scenario, respectively. The new energy equipment is connected to the rectifier module, and the power grid interface is connected to the power grid.

[0007] The rectifier module is used to disconnect from the power grid interface and connect to the power supply equipment when the power grid fails.

[0008] The power supply equipment is used to send a first AC signal to the rectifier module via the AC bus;

[0009] The rectifier module is also used to receive a first AC signal output by the power supply equipment when the power grid fails or the power generation of the new energy equipment does not meet the rated power of the load, rectify the first AC signal into a DC bus signal, and send it to the load through the DC bus to provide a stable power supply to the load.

[0010] Optionally, the new energy equipment includes: a photovoltaic panel and a first boost unit;

[0011] The photovoltaic panel is connected to the load after being boosted by the first boost unit;

[0012] The photovoltaic panel is used to convert the received light signal into a first electrical signal and send it to the first boost unit.

[0013] The first boost unit is used to boost the first electrical signal into a DC bus signal and send it to the load through the DC bus when it receives the first electrical signal.

[0014] Optionally, the new energy equipment further includes: a wind turbine and a first rectifier unit;

[0015] The wind turbine is connected to the load after being rectified by the first rectifier unit;

[0016] The wind turbine is used to convert a wind signal into a second electrical signal and send it to the first rectifier unit when it receives a wind signal.

[0017] The first rectifier unit is used to rectify the second electrical signal into a DC bus signal when it receives the second electrical signal and send it to the load through the DC bus.

[0018] Optionally, the new energy equipment further includes: a storage battery;

[0019] The battery is connected to the load via the DC bus;

[0020] The battery is used to charge when receiving a DC bus signal, provided that the power generation of the photovoltaic panel and the wind turbine meets the rated operating power of the load.

[0021] The battery is also used to send a third electrical signal to the load through the DC bus to supply power when the power generation of the photovoltaic panel and the wind turbine does not meet the rated operating power of the load.

[0022] Optionally, the power supply equipment includes: a gas turbine and a long-term energy storage module;

[0023] The rectifier module is connected to the gas turbine and the long-term energy storage module respectively;

[0024] The gas turbine is used to convert chemical energy into electrical energy and output a first AC signal corresponding to the electrical energy to the rectifier module when the power grid fails or the power generation of the new energy equipment does not meet the rated power of the load.

[0025] The long-term energy storage module is used to send a first AC signal to the rectifier module when a grid fault occurs or the power generation of the new energy equipment does not meet the rated power of the load.

[0026] Optionally, the rectifier module includes: a first buck unit and a second rectifier unit;

[0027] The first step-down unit is connected to the power supply equipment, the power grid interface, and the second rectifier unit, respectively;

[0028] The first step-down unit is used to step down the first AC signal into a second AC signal and send it to the second rectifier unit when it receives the first AC signal;

[0029] The second rectifier unit is used to rectify the second AC signal into a DC bus signal when it receives the second AC signal and send it to the load through the DC bus.

[0030] Optionally, the semi-off-grid microgrid integrated energy system further includes: a second boost unit, a first inverter unit, and a second inverter unit;

[0031] The second boost unit, the first inverter unit, and the second inverter unit are respectively connected to the rectifier module, the new energy equipment, and the load;

[0032] The second boost unit is used to boost the DC bus signal into a first DC signal and send it to the load when a DC bus signal is received;

[0033] The first inverter unit is used to invert the DC bus signal into a third AC signal and send it to the load when it receives the DC bus signal;

[0034] The second inverter unit is used to invert the DC bus signal into a fourth AC signal and send it to the load when it receives the DC bus signal.

[0035] Optionally, the new energy equipment is used to generate electricity from renewable energy technologies to provide additional power to the load when the power grid supplies power to the load.

[0036] Optionally, the power grid interface is used to send a fifth AC signal to the rectifier module through the AC bus when a fifth AC signal is received from the power grid;

[0037] The rectifier module is also used to rectify the fifth AC signal into a DC bus signal when it receives the fifth AC signal and send it to the load through the DC bus to provide a stable power supply to the load.

[0038] One or more technical solutions proposed in this application have at least the following effects:

[0039] This application proposes a semi-off-grid microgrid integrated energy system applied in an oilfield scenario. The system includes a grid interface, power supply equipment, a rectifier module, and renewable energy equipment. The rectifier module is connected to the grid interface, the power supply equipment, and the load in the oilfield scenario. The renewable energy equipment is connected to the rectifier module. The grid interface is connected to the power grid. When a grid fault occurs, the rectifier module disconnects from the grid interface and connects to the power supply equipment. The power supply equipment sends a first AC signal to the rectifier module via an AC bus. The rectifier module also receives the first AC signal output by the power supply equipment, rectifies it into a DC bus signal, and sends it to the load via the DC bus to provide stable power. Compared with existing technologies, this application reduces conversion stages, lowers losses, and improves energy utilization by establishing an AC / DC coupled microgrid. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the first embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0042] Figure 2 This is a schematic diagram of the structure of the second embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0043] Figure 3 This is a schematic diagram of the third embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0044] Figure 4 This is a circuit diagram of the fourth embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0045] Figure 5This is a diagram of the architecture of the AC / DC coupled semi-off-grid microgrid hydrogen production system in this application.

[0046] Explanation of icon numbers:

[0047] label name label name 1 Power grid interface 2 Power supply equipment 3 rectifier module 4 New energy equipment 21 gas turbine 22 Long-term energy storage module 31 First step-down unit 32 Second rectifier unit 41 Photovoltaic panels 42 Wind turbine 411 First boost unit 421 First Rectifier Unit 51 Second boost unit 52 First Inverter Unit 53 Second inverter unit

[0048] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not intended to limit this application.

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0053] The main solution of this application embodiment is to achieve friendly access to different types of power sources and loads by establishing an AC / DC coupled microgrid, reducing conversion links, reducing losses, improving power utilization, and installing energy storage on the distributed wind power side to ensure the stability of microgrid voltage and frequency.

[0054] With the increasing proportion of distributed power sources and DC loads, the power supply and load side equipment of microgrid-based distribution networks will gradually exhibit DC characteristics. For example, photovoltaic and energy storage are DC sources themselves, and connecting them to the AC grid requires an additional DC / AC link. Although wind turbines and diesel generators generate AC power from rotating equipment, their frequencies are often inconsistent with the main grid and cannot be directly connected to the grid. They need to be converted to DC (AC / DC link) and then to high-quality AC (DC / AC link). Therefore, AC power systems have low conversion efficiency and high investment costs when accepting DC distributed power sources, and do not have corresponding advantages. In addition, on the load side, the proportion of DC load in oilfield loads is constantly increasing. Electrolyzers in hydrogen production equipment, thermal storage electric boilers and ground source heat pumps that heat electrolyzers, DC-type oil pumping units, electronic equipment in control centers (such as computers and monitors), electric vehicles, and frequency converters are all DC-powered equipment. When using AC systems for power supply, additional AC / DC links are required, increasing system investment and operating costs and reducing system conversion efficiency. However, since the current distribution network is still mainly powered by AC, and there are still a large number of DC loads in the system, the coexistence and coordinated development of AC and DC will be the inevitable path in the future development of the distribution network.

[0055] Hybrid AC / DC microgrids fully utilize the advantages of both AC and DC power supply, rationally distributing AC and DC distributed power sources and loads, minimizing intermediate conversion stages (DC / AC or AC / DC), and improving microgrid system efficiency. The two heterogeneous AC and DC subgrids are connected via interconnecting converters to achieve mutual conversion and support between AC and DC power. The entire hybrid AC / DC microgrid is connected to the main grid on the AC subgrid side through a PCC point. When the main grid fails or the hybrid microgrid is planned to be islanded, the PCC point is disconnected, and the hybrid microgrid disconnects from the main grid and enters islanded mode.

[0056] Currently, there is no design for a comprehensive energy system of AC / DC coupled semi-off-grid microgrids for oilfield scenarios. This results in low power utilization rates in oilfield production bases with various types of DC power sources and loads, large power losses due to multiple conversion links, and high equipment investment and operating costs. In the event of AC grid failure in edge weak grid scenarios, oilfield microgrids cannot provide stable support.

[0057] This application provides a solution: a semi-off-grid microgrid integrated energy system applied in an oilfield scenario. The system includes a grid interface 1, a power supply device 2, a rectifier module 3, and a new energy device 4. The rectifier module 3 is connected to the grid interface 1, the power supply device 2, and the load in the oilfield scenario. The new energy device 4 is connected to the rectifier module 3. The grid interface 1 is connected to the power grid. When a grid fault occurs, the rectifier module 3 disconnects from the grid interface 1 and connects to the power supply device 2. The power supply device 2 sends a first AC signal to the rectifier module 3 via an AC bus. The rectifier module 3 also receives the first AC signal output by the power supply device 2, rectifies it into a DC bus signal, and sends it to the load via the DC bus to provide stable power. Compared with existing technologies, this application reduces conversion stages, lowers losses, and improves energy utilization by establishing an AC / DC coupled microgrid.

[0058] It should be noted that, as Figure 5 As shown, the loads in the oilfield load scenario include: thermal storage electric boilers, ground source (air source) heat pumps, hydrogen production power supplies, electrolyzers, power supply system auxiliary facilities (BOP), pumping units, AC loads, and DC loads. The thermal storage electric boilers and ground source (air source) heat pumps are used to heat the electrolyzers and recover waste heat. The electrolyzers are used to produce hydrogen and store it in hydrogen storage tanks. DC loads also include: DC pumping units, electronic equipment in the control center (such as computers, monitors, etc.), electric vehicles, and 400VAC inverter drives. The power supply system auxiliary facilities can be used for both AC and DC power supply. The parameters and specifications of the hydrogen production power supply and electrolyzers include: output power (MW level, which can be configured according to actual needs), rated voltage of 400VDC, and maximum input current (calculated based on the electrolyzer's standard capacity). AC loads can be directly powered through the AC bus, DC loads can be directly powered through the DC bus, and the thermal storage electric boilers and ground source (air source) heat pumps are directly powered through the DC bus.

[0059] It is understood that the DC bus and the AC bus are the common DC bus and the common AC bus of the AC / DC coupled semi-off-grid microgrid integrated energy system in this application, respectively. The AC / DC hybrid microgrid can make full use of the advantages of AC power supply and DC power supply, and can reasonably distribute AC / DC distributed power sources and loads, minimize intermediate conversion links (DC / AC or AC / DC), and improve the efficiency of the microgrid system.

[0060] Based on this, the embodiments of this application provide a semi-off-grid microgrid integrated energy system.

[0061] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0062] Considering that oilfield microgrids cannot provide stable support under AC grid failure conditions in edge weak grid scenarios, a suitable AC / DC coupled semi-off-grid microgrid integrated energy system is needed, such as... Figure 1 As shown, the semi-off-grid microgrid integrated energy system described in this embodiment includes: grid interface 1, power supply equipment 2, rectifier module 3, and new energy equipment 4;

[0063] The rectifier module 3 is connected to the power grid interface 1, the power supply equipment 2, and the load of the oilfield load scenario, respectively. The new energy equipment 4 is connected to the rectifier module 3, and the power grid interface 1 is connected to the power grid.

[0064] The rectifier module 3 is used to disconnect from the power grid interface 1 and connect to the power supply equipment 2 when the power grid fails.

[0065] The power supply device 2 is used to send a first AC signal to the rectifier module 3 via the AC bus;

[0066] The rectifier module 3 is also used to receive the first AC signal output by the power supply equipment 2 when the power grid fails or the power generation of the new energy equipment 4 does not meet the rated power of the load, rectify the first AC signal into a DC bus signal, and send it to the load through the DC bus to provide stable power supply to the load.

[0067] It should be noted that the power grid is an AC power grid. Power grid faults can be short circuit faults, open line faults, or other types of faults. The voltage of the DC bus signal is the DC bus voltage, and the DC bus voltage specification can be 600VDC. The AC bus voltage specification can be 10kVAC. The voltage of the first AC signal is reduced to the AC bus voltage. The voltage reduction factor can be set according to the actual situation.

[0068] It is understandable that the rated power of the load operation refers to the maximum power that the load equipment or system can continuously and stably output under normal working conditions. The power generation power of the new energy equipment 4 is the power generation power of the photovoltaic panel 41 and the wind turbine generator 42 and the power supply power of the battery.

[0069] In a specific implementation, when the power grid fails, the rectifier module 3 disconnects from the power grid interface 1 and connects to the power supply equipment 2. The power supply equipment 2 sends a first AC signal to the rectifier module 3 via the AC bus. When the power grid fails or the power generation of the new energy equipment 4 does not meet the rated power of the load, the rectifier module 3 receives the first AC signal output by the power supply equipment 2, rectifies the first AC signal into a DC bus signal, and sends it to the load via the DC bus to provide stable power supply to the load. By establishing an AC / DC coupled microgrid, it achieves friendly access to different types of power sources and loads, reduces conversion links, reduces losses, and improves energy utilization. The energy storage device in the new energy equipment 4 ensures the stability of the microgrid voltage and frequency.

[0070] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0071] Considering renewable energy generation, and in order to ensure the stability of microgrid power supply, such as Figure 2 As shown, the new energy equipment 4 described in this embodiment includes: a photovoltaic panel 41 and a first boost unit 411;

[0072] The photovoltaic panel 41 is connected to the load after being boosted by the first boost unit 411;

[0073] The photovoltaic panel 41 is used to convert the received light signal into a first electrical signal and send it to the first boost unit 411.

[0074] The first boost unit 411 is used to boost the first electrical signal into a DC bus signal and send it to the load through the DC bus when it receives the first electrical signal.

[0075] It should be noted that the photovoltaic panel 41, also known as a solar panel, is a photoelectric semiconductor thin film that directly generates electricity using sunlight. As long as the photovoltaic panel 41 receives sufficient illuminance, it can instantly output voltage and generate current when a circuit is present. The voltage of the first electrical signal can be a DC voltage, and the light signal can be sunlight. The first boost unit 411 is a DC / DC module. The boost factor of the first boost unit 411 can be set according to the DC bus voltage or can be set according to actual conditions. The first boost unit 411 can be a transformer, a boost converter, or can be set according to actual conditions.

[0076] Understandably, the photovoltaic interface parameters of photovoltaic panel 41 include: voltage of 780VDC to 820VDC, rated power (which can be configured according to actual requirements), maximum continuous current of branch (which can be calculated according to actual requirements), number of MPPTs (Maximum Power Point Tracking) (which can be calculated according to actual requirements), and maximum conversion efficiency of 99.6%.

[0077] In a specific implementation, when the photovoltaic panel 41 receives a light signal, it converts the light signal into a first electrical signal and sends it to the first boost unit 411. When the first boost unit 411 receives the first electrical signal, it boosts the first electrical signal into a DC bus signal and sends it to the load through the DC bus, thereby providing a stable power supply for the oilfield microgrid.

[0078] Furthermore, the new energy equipment 4 also includes: a wind turbine generator 42 and a first rectifier unit 421;

[0079] The wind turbine 42 is connected to the load after being rectified by the first rectifier unit 421;

[0080] The wind turbine 42 is used to convert the wind signal into a second electrical signal and send it to the first rectifier unit 421 when it receives a wind signal.

[0081] The first rectifier unit 421 is used to rectify the second electrical signal into a DC bus signal and send it to the load through the DC bus when the second electrical signal is received.

[0082] It should be noted that the wind turbine 42 mainly consists of components such as a wind rotor, generator, directional control (tail fin), tower, speed limiting safety mechanism, and energy storage device. Among these, the wind rotor is the key component of the wind turbine 42, composed of blades, hub, and reinforcement components, responsible for converting the kinetic energy of the wind into mechanical energy, thereby driving the generator to produce electricity. The wind signal can be natural wind, and the voltage of the second electrical signal can be AC ​​voltage. The first rectifier unit 421 is an AC / DC module, which can be a diode rectifier, a thyristor rectifier, or a custom configuration depending on the actual situation. Energy storage devices can also be installed on the wind turbine 42 side to ensure the stability of the microgrid voltage and frequency.

[0083] Understandably, the wind turbine 42's wind and energy storage interface specifications include: turbine voltage (690VAC), rated power (which can be configured according to actual requirements), and battery capacity (which can be adapted to the turbine capacity).

[0084] In a specific implementation, when the wind turbine 42 receives a wind signal, it converts the wind signal into a second electrical signal and sends it to the first rectifier unit 421. When the first rectifier unit 421 receives the second electrical signal, it rectifies the second electrical signal into a DC bus signal and sends it to the load through the DC bus, thereby providing a stable power supply for the oilfield microgrid.

[0085] Furthermore, the new energy equipment 4 also includes: a storage battery;

[0086] The battery is connected to the load via a DC bus;

[0087] The battery is used to charge when receiving a DC bus signal, provided that the power generation of the photovoltaic panel 41 and the wind turbine 42 meets the rated power of the load operation.

[0088] The battery is also used to send a third electrical signal to the load through the DC bus to supply power when the power generation of the photovoltaic panel 41 and the wind turbine 42 does not meet the rated power of the load.

[0089] It should be noted that a storage battery, also known as a secondary battery or lead-acid battery, is a device that directly converts chemical energy into electrical energy. Storage batteries are recharged through a reversible chemical reaction, thus allowing for repeated use. A DC / DC module can also be included between the storage battery and the DC bus. The voltage from the DC bus signal is boosted or bucked to charge the battery, and when the battery is fully charged, it supplies power to the load through the DC bus.

[0090] It is understandable that the energy storage interface parameters of the battery include: battery voltage can be 400VDC, battery capacity (which can be determined according to actual configuration), and rated power (which can be determined according to actual configuration).

[0091] In a specific implementation, the battery is charged when it receives a DC bus signal when the power generation of the photovoltaic panel 41 and the wind turbine 42 meets the rated power of the load. When the power generation of the photovoltaic panel 41 and the wind turbine 42 does not meet the rated power of the load, the battery sends a third electrical signal to the load through the DC bus to supply power, thereby providing a stable power supply for the oilfield microgrid.

[0092] Furthermore, the power supply equipment 2 includes: a gas turbine 21 and a long-term energy storage module 22;

[0093] The rectifier module 3 is connected to the gas turbine 21 and the long-term energy storage module 22 respectively;

[0094] The gas turbine 21 is used to convert chemical energy into electrical energy and output a first AC signal corresponding to the electrical energy to the rectifier module 3 when the power grid fails or the power generation of the new energy equipment 4 does not meet the rated power of the load operation.

[0095] The long-term energy storage module 22 is used to send a first AC signal to the rectifier module 3 when a grid fault occurs or the power generation of the new energy equipment 4 does not meet the rated power of the load operation.

[0096] It should be noted that the gas turbine 21 is a rotating turbine-type thermal engine that uses continuously flowing gas as the working fluid to drive the impeller to rotate at high speed, converting the energy of the fuel into useful work, thereby generating electricity. Long-term energy storage, based on ordinary energy storage systems, is an energy storage system that can achieve charge-discharge cycles across days, months, and even seasons. The long-term energy storage module 22 has the ability to provide stable power support to the power system while improving the system's reliability and flexibility.

[0097] In a specific implementation, when the power grid fails or the power generation of the new energy equipment 4 does not meet the rated power of the load, the gas turbine 21 converts chemical energy into electrical energy and outputs a first AC signal corresponding to the electrical energy to the rectifier module 3. When the power grid fails or the power generation of the new energy equipment 4 does not meet the rated power of the load, the long-term energy storage module 22 sends a first AC signal to the rectifier module 3, thereby providing stable power supply to the oilfield microgrid in the case of a fault in the AC main grid or insufficient power generation / supply of the new energy equipment 4 in the edge weak grid scenario.

[0098] Based on the second embodiment of this application, in the third embodiment of this application, the content that is the same as or similar to the second embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 , refer to Figure 3 , Figure 3 This is a schematic diagram of the third embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0099] Considering that the AC voltage provided by the power grid and power supply equipment 2 (gas turbine 21 and long-term energy storage module 22) cannot directly supply power to the load in the oilfield load scenario, in order to step down the AC voltage and rectify it into DC voltage, such as Figure 3 As shown, the rectifier module 3 in this embodiment includes: a first step-down unit 31 and a second rectifier unit 32;

[0100] The first step-down unit 31 is connected to the power supply equipment 2, the power grid interface 1 and the second rectifier unit 32 respectively;

[0101] The first step-down unit 31 is used to step down the first AC signal into a second AC signal and send it to the second rectifier unit 32 when it receives the first AC signal;

[0102] The second rectifier unit 32 is used to rectify the second AC signal into a DC bus signal when it receives the second AC signal and send it to the load through the DC bus.

[0103] It should be noted that the first step-down unit 31 is a DC / DC module. The first step-down unit 31 can be a step-down station or a transformer, which can be set according to the actual situation. The second rectifier module 3 is an AC / DC module, and the voltage of the second AC signal is an AC voltage.

[0104] In a specific implementation, when the first step-down unit 31 receives the first AC signal, it steps down the first AC signal into a second AC signal and sends it to the second rectifier unit 32. When the second rectifier unit 32 receives the second AC signal, it rectifies the second AC signal into a DC bus signal and sends it to the load through the DC bus.

[0105] Based on the third embodiment of this application, in the fourth embodiment of this application, the content that is the same as or similar to the third embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 4 , Figure 4 This is a schematic diagram of the fourth embodiment of the semi-off-grid microgrid integrated energy system proposed in this application.

[0106] Considering that power cannot be directly supplied to oilfield loads via the DC bus, and in order to boost, step down, or invert the DC bus voltage to AC voltage to supply power to the load, such as... Figure 4 As shown, the semi-off-grid microgrid integrated energy system described in this embodiment also includes: a second boost unit 51, a first inverter unit 52, and a second inverter unit 53;

[0107] The second boost unit 51, the first inverter unit 52, and the second inverter unit 53 are respectively connected to the rectifier module 3, the new energy equipment 4, and the load;

[0108] The second boost unit 51 is used to boost the DC bus signal into a first DC signal and send it to the load when a DC bus signal is received;

[0109] The first inverter unit 52 is used to invert the DC bus signal into a third AC signal and send it to the load when it receives the DC bus signal;

[0110] The second inverter unit 53 is used to invert the DC bus signal into a fourth AC signal and send it to the load when it receives the DC bus signal.

[0111] It should be noted that the second boost unit 51 is a DC / DC module that supplies power to the electrolytic cell. The supply voltage can be set according to actual conditions. The second boost unit 51 can be a transformer, a booster, or can be set according to actual conditions. The first inverter unit 52 and the second inverter unit 53 are DC / AC modules. The first inverter unit 52 supplies power to the BOP auxiliary facility of the power supply system, and the second inverter unit 53 supplies power to the pumping unit. The supply voltage can be set according to actual conditions. The voltages of the third AC signal and the fourth AC signal are AC voltages. The first inverter unit 52 and the second inverter unit 53 can be inverters or can be set according to actual conditions. The AC output parameters of the second inverter unit 53 include: output power (based on the actual pumping unit load requirements) and rated voltage of 400VAC.

[0112] In a specific implementation, when the second boost unit 51 receives the DC bus signal, it boosts the DC bus signal into a first DC signal and sends it to the load. When the first inverter unit 52 receives the DC bus signal, it inverts the DC bus signal into a third AC signal and sends it to the load. When the second inverter unit 53 receives the DC bus signal, it inverts the DC bus signal into a fourth AC signal and sends it to the load, thereby providing a stable power supply to the load through the DC bus.

[0113] Furthermore, the new energy device 4 is used to generate electricity from renewable energy technology to provide additional power to the load when the power grid supplies power to the load.

[0114] It should be noted that renewable energy technology power generation can be achieved through wind power generation (wind turbine 42) or solar power generation (photovoltaic panel 41).

[0115] In a specific implementation, when the power grid supplies power to the load, the new energy device 4 generates electricity through renewable energy technology to provide additional power to the load.

[0116] Furthermore, the power grid interface 1 is used to send a fifth AC signal to the rectifier module 3 through the AC bus when a fifth AC signal is received from the power grid;

[0117] The rectifier module 3 is also used to rectify the fifth AC signal into a DC bus signal when it receives the fifth AC signal and send it to the load through the DC bus to provide a stable power supply to the load.

[0118] It should be noted that the voltage of the fifth AC signal is an AC voltage.

[0119] In a specific implementation, when the power grid interface 1 receives the fifth AC signal from the power grid, it sends the fifth AC signal to the rectifier module 3 through the AC bus. When the rectifier module 3 receives the fifth AC signal, it rectifies the fifth AC signal into a DC bus signal and sends it to the load through the DC bus to provide a stable power supply to the load.

[0120] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A semi-off-grid microgrid integrated energy system, characterized in that, The system is applied in oilfield scenarios, and the semi-off-grid microgrid integrated energy system includes: a grid interface, power supply equipment, a rectifier module, and new energy equipment; The rectifier module is connected to the power grid interface, the power supply equipment, and the load of the oilfield load scenario, respectively. The new energy equipment is connected to the rectifier module, and the power grid interface is connected to the power grid. The rectifier module is used to disconnect from the power grid interface and connect to the power supply equipment when the power grid fails. The power supply equipment is used to send a first AC signal to the rectifier module via the AC bus; The rectifier module is also used to receive a first AC signal output by the power supply equipment when the power grid fails or the power generation of the new energy equipment does not meet the rated power of the load, rectify the first AC signal into a DC bus signal, and send it to the load through the DC bus to provide a stable power supply to the load.

2. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The new energy equipment includes: a photovoltaic panel and a first boost unit; The photovoltaic panel is connected to the load after being boosted by the first boost unit; The photovoltaic panel is used to convert the received light signal into a first electrical signal and send it to the first boost unit. The first boost unit is used to boost the first electrical signal into a DC bus signal and send it to the load through the DC bus when it receives the first electrical signal.

3. The semi-off-grid microgrid integrated energy system as described in claim 2, characterized in that, The new energy equipment also includes: a wind turbine and a first rectifier unit; The wind turbine is connected to the load after being rectified by the first rectifier unit; The wind turbine is used to convert a wind signal into a second electrical signal and send it to the first rectifier unit when it receives a wind signal. The first rectifier unit is used to rectify the second electrical signal into a DC bus signal when it receives the second electrical signal and send it to the load through the DC bus.

4. The semi-off-grid microgrid integrated energy system as described in claim 3, characterized in that, The new energy equipment also includes: a storage battery; The battery is connected to the load via a DC bus; The battery is used to charge when receiving a DC bus signal, provided that the power generation of the photovoltaic panel and the wind turbine meets the rated operating power of the load. The battery is also used to send a third electrical signal to the load through the DC bus to supply power when the power generation of the photovoltaic panel and the wind turbine does not meet the rated operating power of the load.

5. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The power supply equipment includes: a gas turbine and a long-term energy storage module; The rectifier module is connected to the gas turbine and the long-term energy storage module respectively; The gas turbine is used to convert chemical energy into electrical energy and output a first AC signal corresponding to the electrical energy to the rectifier module when the power grid fails or the power generation of the new energy equipment does not meet the rated power of the load. The long-term energy storage module is used to send a first AC signal to the rectifier module when a grid fault occurs or the power generation of the new energy equipment does not meet the rated power of the load.

6. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The rectifier module includes: a first buck unit and a second rectifier unit; The first step-down unit is connected to the power supply equipment, the power grid interface, and the second rectifier unit, respectively; The first step-down unit is used to step down the first AC signal into a second AC signal and send it to the second rectifier unit when it receives the first AC signal; The second rectifier unit is used to rectify the second AC signal into a DC bus signal when it receives the second AC signal and send it to the load through the DC bus.

7. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The semi-off-grid microgrid integrated energy system also includes: a second boost unit, a first inverter unit, and a second inverter unit; The second boost unit, the first inverter unit, and the second inverter unit are respectively connected to the rectifier module, the new energy equipment, and the load; The second boost unit is used to boost the DC bus signal into a first DC signal and send it to the load when a DC bus signal is received; The first inverter unit is used to invert the DC bus signal into a third AC signal and send it to the load when it receives the DC bus signal; The second inverter unit is used to invert the DC bus signal into a fourth AC signal and send it to the load when it receives the DC bus signal.

8. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The new energy equipment is used to generate electricity from renewable energy technologies to provide additional power to the load when the power grid supplies power to the load.

9. The semi-off-grid microgrid integrated energy system as described in claim 1, characterized in that, The power grid interface is used to send a fifth AC signal to the rectifier module through the AC bus when a fifth AC signal is received from the power grid. The rectifier module is also used to rectify the fifth AC signal into a DC bus signal when it receives the fifth AC signal and send it to the load through the DC bus to provide a stable power supply to the load.

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