Power supply system for gas safety equipment and method for controlling power supply system

Abstract

The invention provides a power supply system for gas safety equipment and a method for controlling the power supply system. The power supply system comprises a gas generator for generating power by using gas and a micro-grid electrically connected between the gas generator and the gas safety equipment. The microgrid includes: a rectification unit electrically connected to the gas generator and transmitting power from the gas generator to a first node; the carbon-based capacitor module is electrically connected to the rectifying unit through a first node, and charges itself or outputs power to the first node by using the power from the first node; one side of the bidirectional converter unit is electrically connected to the carbon-based capacitor module and the rectification unit, and the other side of the bidirectional converter unit is electrically connected to a mains supply loop; an input terminal of the inversion unit is electrically connected to the carbon-based capacitor module and the rectification unit through a first node, an output terminal of the inversion unit is electrically connected to the gas safety equipment, the inversion unit is connected with the bidirectional converter unit in parallel, and the gas safety equipment is electrically connected to a mains supply loop through a switch element.

Description

Technical Field

[0001] The present disclosure relates to a power supply system and a power supply method, and more particularly, to a power supply system and a power supply method for gas safety equipment. Background Art

[0002] During the mining process of coal mines and other mines, a certain amount of gas usually escapes. In order to ensure the safety of underground operations, it is necessary to discharge the gas in the mine to the outside through gas safety equipment. Gas safety equipment usually includes gas pumps and ventilators, which are generally powered by the mains network. In order to ensure that the gas safety equipment can be powered stably and continuously, a dual-circuit power supply can be used, that is, after one circuit is powered off, the other circuit can assume the operation of the gas safety equipment under normal circumstances. However, some coal mines are located in mountainous areas. In severe climates or special circumstances, even if there is a dual-circuit power supply, there is a situation where both circuits are powered off at the same time. At this time, due to the shutdown of the gas safety equipment in the mine, it will cause safety problems such as gas concentration accumulation and excessive gas concentration in the mine.

[0003] In addition, some coal mines will be equipped with gas generators that use gas to generate electricity, which can effectively utilize gas. The electricity generated by the gas generator is transmitted to the double-circuit mains network, and then supplies power to the gas safety equipment in the mine. However, when the mains network fails, the gas generator will also stop operating immediately.

[0004] Although the possibility of a simultaneous power outage in the dual-circuit mains power network in a coal mine is small, once it occurs, it will pose a serious safety hazard to the resumption of mine production due to excessive gas concentration in the mine. Summary of the invention

[0005] In order to solve the above problems, the exemplary embodiments of the present disclosure provide a power supply system for gas safety equipment (e.g., mine gas safety equipment). The power supply system uses a microgrid to rectify and invert the power output by the gas generator to supply power to the gas safety equipment in the mine. The power supply system can provide more stable and reliable power supply for the gas safety equipment, ensuring that the gas safety equipment can operate normally even when the dual-circuit mains power network is out of power, thereby avoiding excessive gas concentration in the mine.

[0006] An exemplary embodiment of the present disclosure also provides a power supply method for a gas safety device.

[0007] A power supply system for a gas safety device according to an example embodiment of the present disclosure includes: a gas generator configured to generate electricity using gas provided by the gas safety device; and a microgrid electrically connected between the gas generator and the gas safety device, the microgrid including: a rectifier unit electrically connected to the gas generator via a first switching element and transmitting power from the gas generator to a first node; a carbon-based capacitor module electrically connected to the rectifier unit via a first node and charging itself using power from the first node or outputting power to the first node; a bidirectional converter unit including a first terminal and a second terminal, the first terminal being electrically connected to the carbon-based capacitor module and the rectifier unit via the first node, and the second terminal being electrically connected to a mains circuit; an inverter unit including an input terminal and an output terminal, the input terminal being electrically connected to the carbon-based capacitor module and the rectifier unit via the first node, and the output terminal being electrically connected to the gas safety device via the second switching element, the inverter unit being connected in parallel with the bidirectional converter unit, and the gas safety device being electrically connected to the mains circuit via a third switching element.

[0008] In an example embodiment, when the microgrid operates normally, the first and second switching elements are turned on and the third switching element is turned off, and when the microgrid stops operating, the third switching element is turned on and the first and second switching elements are turned off.

[0009] In an exemplary embodiment, the bidirectional converter unit is configured when the microgrid operates normally as follows: when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety device, power is transmitted from the first node to the mains circuit; when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety device, power is transmitted from the mains circuit to the first node; and when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety device, the bidirectional converter unit is in a balanced state.

[0010] In an exemplary embodiment, the bidirectional converter unit is configured to stop operating when the mains circuit stops supplying power.

[0011] In an exemplary embodiment, the gas generator is directly connected to the mains circuit via the fourth switching element.

[0012] In an example embodiment, the fourth switching element is configured to be turned on when the microgrid stops operating.

[0013] In an example embodiment, the first node comprises a DC busbar.

[0014] In an exemplary embodiment, the power supply system includes a plurality of sub-power supply systems, each of the plurality of sub-power supply systems includes a gas generator and a microgrid electrically connected between the gas generator and the gas safety device, and the plurality of sub-power supply systems are electrically connected to each other through a connecting cabinet.

[0015] The method for controlling a power supply system according to an exemplary embodiment of the present disclosure includes the following steps: a system startup step: disconnecting the third switch element, starting the inverter unit, connecting the second switch element, transmitting the power stored in the carbon-based capacitor module to the inverter unit, and supplying the power to the gas safety device via the second switch element, so that the gas safety device starts to operate; a gas generator startup step: enabling the gas generator to generate power using the gas provided by the gas safety device, connecting the first switch element, starting the rectifier unit, and transmitting the power generated by the gas generator to the first node; and a system automatic control step: turning on the bidirectional converter unit, according to the gas The load of the gas safety device, the output power of the gas generator and the output power of the carbon-based capacitor module are used to adjust the current direction in the bidirectional conversion unit. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety device, power is transmitted from the first node to the AC power circuit. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety device, power is transmitted from the AC power circuit to the first node. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety device, the bidirectional conversion unit is in a balanced state.

[0016] The method for controlling a power supply system according to an exemplary embodiment of the present disclosure includes the following steps: a system startup step: disconnecting the third switch element, turning on the inverter unit and the bidirectional converter unit, turning on the second switch element, and transmitting power from the mains circuit to the gas safety device via the bidirectional converter unit, the inverter unit, and the second switch element, so that the gas safety device starts to operate; a gas generator startup step: enabling the gas generator to generate power using gas provided by the gas safety device, turning on the first switch element, turning on the rectifier unit, and transmitting power generated by the gas generator to the first node; and a system automatic control step: controlling the power supply according to the gas safety device. The current direction in the bidirectional converter unit is adjusted according to the load of the equipment, the output power of the gas generator and the output power of the carbon-based capacitor module. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety equipment, power is transmitted from the first node to the AC power circuit. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety equipment, power is transmitted from the AC power circuit to the first node. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety equipment, the bidirectional converter unit is in a balanced state.

[0017] Advantages of the exemplary embodiments of the present disclosure include but are not limited to: 1. Instead of using diesel generators, the gas generated by mining can be used to generate electricity, saving the cost of use; 2. By setting up a microgrid, the surplus power after the gas generator is powered can be connected to the grid and the power supply can be supplemented when there is a power shortage; 3. By setting up a microgrid, the gas safety equipment and gas generator can be ensured to operate normally when the mains power circuit stops supplying power; 4. When the mains power circuit stops supplying power, the microgrid system can be isolated from the mains power circuit, thus preventing the equipment in the microgrid and the gas safety equipment from being damaged instantly in the mains power circuit; 5. By controlling the output power of the gas generator and adjusting the rectifier power of the rectifier unit and the power (charging or discharging power) of the bidirectional converter unit according to the load of the gas safety equipment monitored in real time, the gas generator can generate electricity to the maximum extent and supply the surplus power to the grid, making full use of the gas resources of the coal mine; 6. After rectification and inversion, the gas generator is connected to the grid, which can significantly reduce power fluctuations and interference, improve power output characteristics, enhance power quality, and better meet the quality requirements of the power grid, thereby effectively improving power generation efficiency.

[0018] 7. Set the carbon-based capacitor module to the microgrid, and use the high power density of the carbon-based capacitor to instantly stabilize the DC voltage of the power supply system when the load of the gas safety equipment changes. In addition, the present disclosure is not limited by the above technical effects, that is, the present disclosure can achieve any one or more of the above technical effects, and can also achieve effects other than the above technical effects. The specific protection scope of the present disclosure shall be defined by the attached claims and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other aspects, features and advantages of the present disclosure will become clear through the following detailed description of some exemplary embodiments of the present disclosure in conjunction with the accompanying drawings. In the accompanying drawings, the same reference numerals will always indicate the same elements.

[0020] Figure 1 The present invention is a schematic diagram showing a power supply system for gas safety equipment using a dual-circuit mains power supply according to the prior art.

[0021] Figure 2 is a schematic diagram illustrating a power supply system for a gas safety device according to an example embodiment of the present disclosure.

[0022] Figure 3 is a schematic diagram illustrating a power supply system for a gas safety device according to another example embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Hereinafter, various example embodiments of the present disclosure will be more fully described with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be construed as being limited to the drawings shown herein and the example embodiments set forth herein. These drawings and example embodiments are provided to facilitate understanding of the present disclosure by those skilled in the art and are not intended to imply the present disclosure in any way.

[0024] When the term "about" or "substantially" is used in conjunction with a numerical value in this specification, it is intended that the associated numerical value includes a manufacturing or operating tolerance (e.g., ±10%) around the stated numerical value. In addition, when the term "about" or "substantially" is used in conjunction with a geometric shape, it is intended that the accuracy of the geometric shape is not required, but the limits of the shape are within the scope of the present disclosure. In addition, regardless of whether a numerical value or shape is modified as "about" or "substantially", it will be understood that these values ​​and shapes should be interpreted as including a manufacturing or operating tolerance (e.g., ±10%) around the stated numerical value or shape.

[0025] Figure 1 The present invention is a schematic diagram showing a power supply system for gas safety equipment using a dual-circuit mains power supply according to the prior art.

[0026] Reference Figure 1 The prior art gas safety equipment power supply system using a mains dual circuit power supply includes two groups of gas safety related equipment (hereinafter referred to as "gas safety equipment"), and the two groups of gas safety equipment are respectively connected to the mains circuit to obtain the power required for operation from the mains circuit. The two groups of gas safety equipment are interconnected through a connecting cabinet. When one mains circuit stops supplying power, the other mains circuit can supply power to the two groups of gas safety equipment at the same time through the connecting cabinet.

[0027] In addition, the gas safety device power supply system of the prior art uses a diesel generator as a backup power supply when both mains circuits stop supplying power. Specifically, when both mains circuits stop supplying power, the gas generator and the gas safety device both stop running, then the diesel generator is started, the switch is switched, and then the gas generator and the gas safety device are started.

[0028] In this case, in order to ensure that the gas concentration in the mine meets the safety production standards, it is necessary to ensure that the diesel generator can restart the gas safety equipment smoothly and operate normally when both mains circuits stop supplying power. Since the gas safety equipment itself has a large load and is mainly started at power frequency, the instantaneous starting power of the equipment is about 2 to 5 times its rated power. Therefore, the capacity of the diesel generator to be configured must be at least 2 times the rated power of the gas safety equipment, which will result in higher energy consumption, and it may still be impossible to start all the gas safety equipment smoothly or make it difficult for all the gas safety equipment to operate normally, resulting in a safety incident of excessive gas concentration. For example, taking a domestic coal mine as an example, the configuration of the main fan, gas pump and gas generator in its gas safety equipment is shown in Table 1 below.

[0029] Table 1 The actual operating load size is shown in Table 2.

[0030] Table 2 For example, the rated power of the main fan and gas pump dual circuits in the coal mine's gas safety equipment is 3520kW. In order to meet the equipment startup power requirements, at least a diesel generator with a capacity of about 4000kW is required. On the one hand, it will lead to increased operating costs; on the other hand, even if a diesel generator with the above capacity is configured, there is still a safety risk of diesel generator overload tripping. Therefore, the current situation in the coal mining industry is that the backup diesel generators configured in each mine basically cannot meet the required capacity, and when the mains power circuit stops supplying power, it is easy to have a safety problem of excessive gas concentration.

[0031] With the rapid development of the energy storage industry in recent years, lithium battery energy storage and grid-connected AC power supply can be used in the power industry. However, lithium batteries cannot meet the high safety requirements of coal mines and therefore cannot be used in coal mines.

[0032] Therefore, the present invention provides a power supply system for gas safety equipment including a microgrid and a control method thereof, which can provide a more stable, safer and more reliable power supply guarantee for the gas safety equipment.

[0033] Figure 2 is a schematic diagram illustrating a power supply system for a gas safety device according to an example embodiment of the present disclosure.

[0034] Reference Figure 2 , a power supply system for a gas safety device according to an exemplary embodiment of the present disclosure includes a microgrid 10 , a gas generator (G) 20 , and a gas safety device 30 .

[0035] The gas safety equipment 30 refers to equipment related to gas safety in the mine, including but not limited to gas pumps, ventilators, etc. The gas safety equipment 30 such as gas pumps, ventilators, etc. can discharge the gas in the mine to the outside and provide it to the gas generator 20 (for example, through a pipeline). The gas generator 20 can generate electricity using the gas provided by the gas safety equipment 30. The present invention has no limitation on the specific type of the gas generator 20, as long as it can convert the chemical energy of the gas into electrical energy.

[0036] Although in Figure 1 Only one gas generator 20 is exemplarily shown in the figure, but it can be understood that the present disclosure is not limited thereto. The power supply system for the gas safety device may include a plurality of gas generators 20 connected in parallel with each other.

[0037] In addition, in the exemplary embodiment, the power supply system for the gas safety device may also include other types of generators, for example, diesel generators, methanol generators, gas generators, solar generators, etc. The gas generator 20 may be used together with other generators to power the microgrid 10 .

[0038] like Figure 2 As shown in FIG. 1 , the microgrid 10 is represented by a dotted frame. The microgrid 10 is electrically connected between the gas generator 20 and the gas safety device 30 , that is, the power generated by the gas generator 20 can be transmitted to the gas safety device 30 via the microgrid 10 .

[0039] The microgrid 10 may include a rectifier unit 110 , a carbon-based capacitor module 120 , a bidirectional converter unit 130 and an inverter unit 140 .

[0040] The rectifier unit 110 may be electrically connected to the gas generator 20 and may transmit power from the gas generator 20 to the first node N1. For example, the first switch element S1 may be disposed between the rectifier unit 110 and the gas generator 20. When the first switch element S1 is turned on, the rectifier unit 110 may be electrically connected to the gas generator 20 and transmit power from the gas generator 20 to the first node N1. The rectifier unit 110 may include at least one rectifier module. For example, each rectifier module may convert the alternating current from the gas generator 20 into direct current and transmit the direct current to the first node N1.

[0041] It will be appreciated by those skilled in the art that the term "node" used herein does not necessarily mean a point where several lines meet, but can be interpreted in a broader sense. For example, a node can be a line or wire through which the same current flows. In an exemplary embodiment of the present disclosure, the first node N1 can include or can be a DC busbar.

[0042] In addition, the term "switching element" used herein refers to any element that can turn a circuit on or off. The switching element may include a manual switch, an automatic switch, a manual-automatic switch, etc. The present disclosure has no particular restrictions on the specific type and working mode of the switching element.

[0043] In an exemplary embodiment, a switch cabinet may be further provided between the gas generator 20 and the rectifying unit 110 .

[0044] In addition, as described above, when the rectifier unit 110 may include a plurality of rectifier modules, a plurality of gas generators 20 or gas generators 20 and other types of generators may correspond to different rectifier modules. The opening and closing of each generator may be adjusted according to actual conditions (for example, the power required for the operation of the gas safety device 30). In other words, only a part of the generators may be turned on, and the power may be transmitted to the first node N1 through the rectifier modules corresponding to the part of the generators in the rectifier unit 110.

[0045] The carbon-based capacitor module 120 can be electrically connected to the rectifier unit 110 via the first node N1, and use the power from the first node N1 to charge itself, or output power to the first node N1. That is, when the power from the gas generator 20 is transmitted to the first node N1 via the rectifier unit 110, the carbon-based capacitor module 120 can use the power from the first node N1 to charge itself. In addition, the carbon-based capacitor module 120 can also output the stored power to the first node N1. For example, when the voltage of the first node N1 is lower than the voltage of the carbon-based capacitor module 120 due to a sudden increase in load, the carbon-based capacitor module 120 can supply power to the first node N1.

[0046] The bidirectional converter unit 130 may include a first terminal and a second terminal, the first terminal being electrically connected to the carbon-based capacitor module 120 and the rectifier unit 110 via the first node N1, and the second terminal being electrically connected to the mains circuit 40. For example, the first terminal may be a DC terminal of the bidirectional converter unit 130, and the second terminal may be an AC terminal of the bidirectional converter unit 130. That is, the DC terminal of the bidirectional converter unit 130 may be electrically connected to the carbon-based capacitor module 120 and the rectifier unit 110 via the first node N1, and the AC terminal of the bidirectional converter unit 130 may be electrically connected to the mains circuit 40.

[0047] Although in Figure 2 The bidirectional converter unit 130 is shown as being directly electrically connected to the mains circuit 40 , but it is understandable that a switch element may also be provided between the bidirectional converter unit 130 and the mains circuit 40 .

[0048] The bidirectional conversion unit 130 can transmit power from the first node N1 to the mains circuit 40, and can also transmit power from the mains circuit 40 to the first node N1. That is, the bidirectional conversion unit 130 can convert the direct current from the first node N1 into alternating current and transmit it to the mains circuit 40, and can also convert the alternating current from the mains circuit 40 into direct current and transmit it to the first node N1. This will be further described later.

[0049] The inverter unit 140 includes an input terminal and an output terminal, wherein the input terminal is electrically connected to the carbon-based capacitor module 120 and the rectifier unit 110 via the first node N1, and the output terminal is electrically connected to the gas safety device 30 via the second switch element S3. That is, the input terminal of the inverter unit 140 can receive direct current from the first node N1, convert the direct current into alternating current, and output a voltage consistent with the voltage required by the gas safety device 30 after filtering and isolating it, thereby supplying power to the gas safety device 30.

[0050] like Figure 2 As shown, the inverter unit 140 and the bidirectional converter unit 130 can be connected in parallel with each other. Therefore, a part of the power transmitted from the gas generator 20 to the first node N1 via the first switch element S1 and the rectifier unit 110 can be provided to the mains circuit 40 via the bidirectional converter unit 130, and another part can be provided to the gas safety device 30 via the inverter unit 140.

[0051] In addition, the carbon-based capacitor module 120 connected to the first node N1 can also receive power from the first node N1 or supply power to the first node N1.

[0052] That is to say, when the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is greater than the load of the gas safety device 30 (i.e., the "1-1 working state" of the power supply system), part of the electricity generated by the gas generator 20 can be provided to the gas safety device 30 through the inverter unit 140, and the other part of the electricity can be provided to the AC power circuit 40 through the bidirectional conversion unit 130.

[0053] When the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is less than the load of the gas safety device 30 (i.e., the "1st-2nd working state" of the power supply system), the bidirectional converter unit 130 can transmit power from the AC power circuit 40 to the first node N1, and this part of power can be provided to the gas safety device 30 via the inverter unit 140.

[0054] In addition, when the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is equal to the load of the gas safety device 30 (i.e., the "1st-3rd working state" of the power supply system), the bidirectional converter unit 130 is in a balanced state, that is, current is neither transmitted from the first node N1 to the AC power circuit 40, nor is current transmitted from the AC power circuit 40 to the first node N1.

[0055] Here, the output power of the gas generator 20 is a positive value or 0, and the output power of the carbon-based capacitor module 120 can be a positive value, a negative value or 0. When the output power of the carbon-based capacitor module 120 is a positive value, it means that it is discharging, when the output power of the carbon-based capacitor module 120 is a negative value, it means that it is charging, and when the output power of the carbon-based capacitor module 120 is 0, it means that it is at the critical point of charging and discharging.

[0056] Therefore, by setting the microgrid 10 with the above structure between the gas generator 20, the gas safety device 30 and the mains circuit 40, that is, one side of the microgrid 10 is connected to the gas generator 20, and the other side is connected to the gas safety device 30 and the mains circuit 40 at the same time, the surplus power after the gas generator 20 supplies the gas safety device 30 can be transmitted to the mains circuit 40, and the power can be supplemented from the mains circuit 40 when the power of the gas generator 20 and the carbon-based capacitor module 120 is insufficient to meet the load of the gas safety device 30. In this way, the gas generator 20 can generate electricity to the maximum extent, and the mains circuit 40 can be supplemented in time when the load of the gas safety device 30 increases, so as to maintain the system efficiency and stability.

[0057] In addition, the power output by the gas generator 20 is rectified by the rectifier unit 110 and then merged with the carbon-based capacitor module 120, and then output to the gas safety device 30 through the inverter unit 140. On the one hand, it can solve the inherent problem of unstable output power of the gas generator 20; on the other hand, it can make the voltage at the first node N1 more stable when the load of the gas safety device 30 changes, thereby providing stable power supply to the gas safety device 30.

[0058] On the other hand, Figure 2 As shown, the gas safety device 30 can be directly electrically connected to the mains circuit 40 via the third switch element S4. That is, when the microgrid 10 stops working (i.e., the "second working state" of the power supply system), the third switch element S4 can be turned on, so that the gas safety device 30 is directly powered by the mains circuit 40.

[0059] For example, the third switch element S4 and the second switch element S3 can be interlocked fast-cut switches. When the microgrid 10 is working normally, the second switch element S3 is turned on and the third switch element S4 is turned off. When the microgrid 10 stops working due to a fault, the system can automatically and quickly switch to disconnect the second switch element S3 and connect the third switch element S4 by detecting a voltage drop and the inverter is shut down or judging a fault switch signal. When the microgrid 10 resumes working, it can be manually or automatically switched to disconnect the third switch element S4 and connect the second switch element S3.

[0060] That is, when the microgrid 10 is working normally, the first switch element S1 and the second switch element S3 are turned on, and the third switch element S4 is turned off. When the microgrid 10 stops working, the third switch element S4 is turned on, and the first switch element S1 and the second switch element S3 are turned off.

[0061] In addition, if Figure 2 As shown, the gas generator 20 can also be directly connected to the mains circuit 40 via the fourth switch element S5. With this arrangement, when the microgrid 10 stops working, the fourth switch element S5 can be turned on so that the power generated by the gas generator 20 can be transmitted to the mains circuit 40 through the fourth switch element S5.

[0062] Therefore, when the microgrid 10 stops working, the third switch element S4 and the fourth switch element S5 are turned on, the electricity generated by the gas generator 20 can be transmitted to the mains circuit 40 through the fourth switch element S5, and the mains circuit 40 can supply power to the gas safety device 30.

[0063] On the other hand, when the mains circuit 40 stops supplying power (i.e., the "third working state" of the power supply system), the bidirectional converter unit 130 can stop operating immediately, while other components in the microgrid 10 maintain their original working states. In other words, when the mains circuit 40 stops supplying power, the microgrid 10 and the gas safety device 30 are effectively physically isolated from the mains circuit 40 by stopping the bidirectional converter unit 130, thereby avoiding the influence of other loads on the power supply of the microgrid when the mains circuit 40 is instantly cut off.

[0064] In addition, by setting up the microgrid 10, it can be ensured that the gas generator 20 and the gas safety device 30 can continue to operate when the mains circuit 40 stops supplying power. That is, at the moment when the mains circuit 40 stops supplying power, the gas generator 20 and the gas safety device 30 can continue to operate without being affected, and the gas generator 20 generates electricity as the energy source of the gas safety device 30.

[0065] Figure 3 is a schematic diagram illustrating a power supply system for a gas safety device according to another example embodiment of the present disclosure.

[0066] Reference Figure 3 The power supply system consists of two parts: Figure 2 The two sub-power supply systems shown (hereinafter referred to as “sub-power supply systems”) have substantially the same structure, that is, both sub-power supply systems include a microgrid 10 , a gas generator (G) 20 and a gas safety device 30 , and are electrically connected to a mains circuit 40 .

[0067] The specific structure and working mode of the two sub-power supply systems are similar to those in the previous reference. Figure 2 The description is basically the same and will not be repeated here.

[0068] exist Figure 3 In the embodiment, a connection cabinet 50 is arranged between the two sub-power supply systems. Under normal circumstances, the connection cabinet 50 is in a disconnected state, that is, the two sub-power supply systems operate independently of each other.

[0069] When the microgrid 10 of one of the sub-power supply systems stops operating, the third switch element S4 and the fourth switch element S5 of the sub-power supply system can be quickly turned on to power the gas safety device 30 through the mains circuit 40 and transmit the circuit generated by the gas generator 20 to the mains circuit 40.

[0070] When the microgrids 10 of the two sub-power supply systems stop operating, the third switch elements S4 and the fourth switch elements S5 of the two sub-power supply systems are respectively turned on, and the respective gas safety devices 30 are powered through their respective mains circuits 40, and the circuit generated by the gas generator 20 is transmitted to the mains circuit 40.

[0071] When the two mains circuits 40 or one of the mains circuits 40 stops supplying power, corresponding operations are performed according to the above description without affecting the normal operation of the corresponding microgrid 10 and the gas safety device 30 .

[0072] When both mains circuits 40 stop supplying power and the microgrid 10 of one sub-power supply system stops operating, the connection cabinet 50 can be connected so that the two sub-power supply systems are connected to each other, and the gas generator 20 and the microgrid 10 of the normally operating sub-power supply system supply power to the gas safety devices 30 of the two sub-power supply systems.

[0073] Although Figure 3 The power supply system for the gas safety device includes only two sub-power supply systems, but it can be understood that the present disclosure has no limitation on the specific number of sub-power supply systems, and the power supply system for the gas safety device may include three, four or more sub-power supply systems.

[0074] Hereinafter, a control method of a power supply system for a gas safety device according to the present disclosure will be described.

[0075] Specifically, the rated power of the gas safety device 30 is P 额 , the real-time operating load is P; the rated power of the gas generator 20 is P 0额 , the real-time power generation is P0; the rated power of the bidirectional converter unit 130 is P 1额 , the real-time operating power is P1 (a positive value of P1 indicates discharge (i.e., power is delivered from the first node N1 to the mains circuit 40), and a negative value of P1 indicates charging (i.e., power is delivered from the mains circuit 40 to the first node N1)); the energy storage peak power of the carbon-based capacitor module 120 is P 2峰 , the real-time operating power is P2 (a positive P2 value indicates discharging, and a negative P2 value indicates charging); the rated power of the inverter unit 140 is P3, and the rated power of the rectifier unit 110 is P4.

[0076] The inverter unit 140 is a component directly related to the microgrid 10 and the gas safety device 30, and the selection of its configuration capacity is crucial for the stable load of the power supply system. Since the inverter unit 140 has a variable frequency drive function, its capacity does not need to be configured according to the capacity of the backup diesel generator solution (more than twice the rated power of the gas safety device 30), and it only needs to be consistent with the rated power of the gas safety device 30 to stably carry the load. The power supply system of the present disclosure fully considers the stability of long-term operation, and the rated power of the inverter unit can be set to P3 as the rated power P of the gas safety device 30. 额 1.5 times of the rated power P of the primary circuit equipment corresponding to column A. 额 If the rated power P3 of the inverter unit is 2080kW, the short-term overload capacity can be configured to 2500kW, and the short-term overload capacity can reach 3750kW, which can meet the equipment startup requirements in extreme situations where the dual-circuit mains power outage and the other microgrid fails.

[0077] For the carbon-based capacitor module 120, considering that it needs to have an independent on-load gas safety device 30 rated power P 额 The capacity requirement for 5 minutes, and the discharge rate is controlled within 10C. According to 80% of the discharge capacity, P can be calculated. 2峰 The value of .

[0078] For the gas generator 20, according to the rated power P of the gas safety device 30 额 The rated power of the gas generator 20 is not greater than 75%, that is, P 额 ≤0.75P 0额 .

[0079] The configuration of the rectifier unit 110 is selected according to the capacity of the gas generator 20 connected to the microgrid 10, which reserves 10% of the capacity, that is, P4 = 1.1P 0额 .

[0080] The capacity of the bidirectional converter unit 130 is configured according to 0.5 times the rated power of the gas generator 20, that is, P 1额 =0.5P 0额 .

[0081] The method for controlling the power supply system for gas safety equipment according to the present disclosure may include the following system startup steps, gas generator start-up steps, and system automatic control steps.

[0082] In the system startup phase, the third switch element S4 can be disconnected first, thereby disconnecting the direct connection between the gas safety device 30 and the mains circuit 40. At this stage, the power stored in the carbon-based capacitor module 120 can be used to drive the gas safety device 30. For example, the inverter unit 140 can be turned on and the second switch element S3 can be turned on, the power stored in the carbon-based capacitor module 120 can be delivered to the inverter unit 140, and supplied to the gas safety device 30 via the second switch element S3, so that the gas safety device 30 starts to operate. In addition, the mains circuit 40 can also be used to drive the gas safety device 30. For example, the inverter unit 140 and the bidirectional converter unit 130 can be turned on, the second switch element S3 can be turned on, and the power can be delivered from the mains circuit 40 to the gas safety device 30 via the bidirectional converter unit 130, the inverter unit 140 and the second switch element S3, so that the gas safety device 30 starts to operate. As the frequency of the frequency converter increases (eg, from 0 to 50 Hz), the gas safety equipment (eg, gas pumps and ventilators) gradually operates.

[0083] In the step of starting the gas generator, after the gas is pumped from the gas pump to the gas generator 20 via a pipeline, each connected gas generator set is immediately started, so that the gas generator 20 starts to operate to generate electricity.

[0084] In the system automatic control step, the bidirectional converter unit 130 can be turned on (if it has been turned on during the system startup phase, this operation can be omitted), and the current direction in the bidirectional converter unit 130 can be adjusted according to the load of the gas safety device 30, the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120.

[0085] For example, the system can collect the real-time load P of the gas safety device 30, the output power P0 of the gas generator 20, the power P1 of the bidirectional converter unit 130, and the power P2 of the carbon-based capacitor module 120. 0额 When the power P1 of the bidirectional conversion unit 130 is set to 0.8P 0额-P, if the P2 value is negative (the carbon-based capacitor is in the charging state), then the P1 value is gradually increased. Correspondingly, the output power P0 of the gas generator 20 will also gradually increase until the P2 value is approximately 0 (the critical point between the charging and discharging of the carbon-based capacitor). The power generated by the gas generator 20 at this time is recorded as P 0max . 0max The value is the maximum power value P of the gas generator 20 for long-term power generation. 0L For comparison, if P 0max <P 0L , then adjust the discharge power P1 of the bidirectional converter unit 130 and set its value to P 0max -P; if P 0max <P 0L , then the discharge power P1 of the bidirectional converter unit 130 is adjusted to P 0L The above process can be called the process of calibrating the maximum power of the gas generator 20 for stable long-term power generation, and this power value is recorded as P 01 .

[0086] The power P1 of the bidirectional conversion unit 130 = P 01 +P2-P, that is, the power P1 of the bidirectional conversion unit 130 is the sum of the output power of the gas generator 20 and the output power P2 of the carbon-based capacitor module 120 minus the load P of the gas safety device 30.

[0087] Adjust the value of PCS power P1 so that the power supply system reaches a balance between supply and demand. 01 When +P2-P>0, the bidirectional converter 130 is in a discharge state, that is, the surplus power of the gas generator 20 is transmitted to the mains circuit 40. 01 When +P2 −P<0, the bidirectional converter unit 130 is in a charging state, that is, the power of the commercial power circuit 40 is transmitted to the microgrid 10 .

[0088] In other words, when the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is greater than the load of the gas safety device 30, the bidirectional converter unit 130 can transmit electricity from the first node N1 to the AC power circuit 40; when the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is less than the load of the gas safety device 30, the bidirectional converter unit 130 can transmit electricity from the AC power circuit 40 to the first node N1; and when the sum of the output power of the gas generator 20 and the output power of the carbon-based capacitor module 120 is equal to the load of the gas safety device 30, the bidirectional converter unit 130 is in a balanced state, that is, neither current is transmitted from the first node N1 to the AC power circuit 40, nor current is transmitted from the AC power circuit 40 to the first node N1.

[0089] By controlling the power supply system according to the real-time collected data and adjusting the charging and discharging power of the bidirectional converter unit 130 as described above, the gas generator can generate electricity to the maximum extent.

[0090] In addition, the charging and discharging state and power of the carbon-based capacitor module 120 can be controlled by adjusting the output voltage of the rectifying unit 110 (ie, the voltage of the first node N1 ) and the DC side voltage of the bidirectional converter unit 130 .

[0091] In addition, when the load P of the gas safety device 30 suddenly increases, the carbon-based capacitor module 120 can automatically adjust its output power P2, thereby playing a role of rapid voltage stabilization at the first node N1 (or DC busbar). The control system can respond to the load demand of the gas safety device 30 by adjusting the power of the rectifier unit 110 and the bidirectional converter unit 130 according to the real-time detected carbon-based capacitor power P2 and the voltage of the first node N1, so that the power supply of the power supply system reaches dynamic balance and stability.

[0092] In addition, the overload capacity of the power supply system can reach 1.5 times the rated power of the gas safety device 30. If it is necessary to add a new gas safety device on the basis of the normally operating gas safety device 30, or it is necessary to connect the contact cabinet 50 to power another sub-power supply system at the same time, the output frequency of the inverter unit 140 can be manually reduced appropriately in the human-machine interface of the control system, so as to control the total load of the gas safety device 30 to be within the overload capacity of the power supply system and then start the additional device. Although the present disclosure has been specifically shown and described above with reference to some exemplary embodiments of the present disclosure, it will be understood that various changes in form and detail may be made by those skilled in the art without departing from the spirit and scope of the appended claims.

Claims

1. A power supply system for gas safety equipment, characterized in that: The power supply system comprises: a gas generator configured to generate electricity using the gas provided by the gas safety device; and Microgrid, electrically connected between gas generator and gas safety equipment, Microgrids include: a rectifying unit electrically connected to the gas generator via the first switching element and transmitting power from the gas generator to the first node; The carbon-based capacitor module is electrically connected to the rectifying unit via the first node, and uses the power from the first node to charge itself, or outputs power to the first node; A bidirectional conversion unit comprises a first terminal and a second terminal, wherein the first terminal is electrically connected to the carbon-based capacitor module and the rectifier unit via a first node, and the second terminal is electrically connected to a mains circuit; The inverter unit includes an input terminal and an output terminal, wherein the input terminal is electrically connected to the carbon-based capacitor module and the rectifier unit via a first node, and the output terminal is electrically connected to the gas safety device via a second switch element, and the inverter unit is connected in parallel with the bidirectional converter unit. The gas safety device is electrically connected to the mains circuit via a third switch element. The bidirectional converter unit is configured to stop operating when the mains circuit stops supplying power.

2. The power supply system for gas safety equipment according to claim 1, characterized in that: When the microgrid is operating normally, the first switch element and the second switch element are turned on, the third switch element is turned off, and When the microgrid stops working, the third switch element is turned on, and the first switch element and the second switch element are turned off.

3. The power supply system for gas safety equipment according to claim 1, characterized in that: When the microgrid is operating normally, the bidirectional converter unit is configured as follows: When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety device, the power is transmitted from the first node to the mains circuit. When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety device, power is transmitted from the mains circuit to the first node, and When the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety device, the bidirectional converter unit is in a balanced state.

4. The power supply system for gas safety equipment according to claim 1, characterized in that: The power supply system may also include a diesel generator, a methanol generator, a gas generator, a solar generator, etc.

5. The power supply system for gas safety equipment according to claim 1, characterized in that: The gas generator is directly connected to the mains circuit via the fourth switch element.

6. The power supply system for gas safety equipment according to claim 1, characterized in that: The fourth switching element is configured to be turned on when the microgrid stops operating.

7. The power supply system for gas safety equipment according to claim 1, characterized in that: The first node includes a DC busbar.

8. The power supply system for gas safety equipment according to claim 1, characterized in that: The power supply system includes a plurality of sub-power supply systems. Each of the plurality of sub-power supply systems includes a gas generator and a microgrid electrically connected between the gas generator and the gas safety device, and The plurality of sub-power supply systems are electrically connected to each other through a connection cabinet.

9. A method for controlling the power supply system according to claim 1, characterized in that: The method comprises the following steps: System startup steps: disconnect the third switch element, start the inverter unit, turn on the second switch element, transmit the power stored in the carbon-based capacitor module to the inverter unit, and supply it to the gas safety device through the second switch element, so that the gas safety device starts to operate; The step of starting the gas generator is to enable the gas generator to generate electricity using the gas provided by the gas safety device, turn on the first switch element, start the rectifier unit, and transmit the electricity generated by the gas generator to the first node; and System automatic control steps: Turn on the bidirectional converter unit, and adjust the current direction in the bidirectional converter unit according to the load of the gas safety equipment, the output power of the gas generator and the output power of the carbon-based capacitor module. Among them, when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety device, electricity is transmitted from the first node to the AC power circuit; when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety device, electricity is transmitted from the AC power circuit to the first node; and when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety device, the bidirectional converter unit is in a balanced state.

10. A method for controlling the power supply system according to claim 1, characterized in that: The method comprises the following steps: System startup steps: disconnect the third switch element, start the inverter unit and the bidirectional converter unit, turn on the second switch element, and transmit power from the mains circuit to the gas safety device via the bidirectional converter unit, the inverter unit and the second switch element, so that the gas safety device starts to operate; The step of starting the gas generator is to enable the gas generator to generate electricity using the gas provided by the gas safety device, turn on the first switch element, start the rectifier unit, and transmit the electricity generated by the gas generator to the first node; and System automatic control steps: adjust the current direction in the bidirectional conversion unit according to the load of the gas safety equipment, the output power of the gas generator and the output power of the carbon-based capacitor module. Among them, when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is greater than the load of the gas safety device, electricity is transmitted from the first node to the AC power circuit; when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is less than the load of the gas safety device, electricity is transmitted from the AC power circuit to the first node; and when the sum of the output power of the gas generator and the output power of the carbon-based capacitor module is equal to the load of the gas safety device, the bidirectional converter unit is in a balanced state.

Images