CN210957901U - Uninterrupted power supply system in high-voltage direct-current power supply based on superconducting energy storage - Google Patents
Uninterrupted power supply system in high-voltage direct-current power supply based on superconducting energy storage Download PDFInfo
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- CN210957901U CN210957901U CN201921425122.XU CN201921425122U CN210957901U CN 210957901 U CN210957901 U CN 210957901U CN 201921425122 U CN201921425122 U CN 201921425122U CN 210957901 U CN210957901 U CN 210957901U
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Abstract
The utility model discloses an uninterrupted power system among high voltage direct current power supply based on superconductive energy storage, its constitution includes: AC input (1), AC-DC converter (2), two-way DC converter (3), high temperature superconducting energy storage device (4), load (5), its characterized in that: the alternating current input (1) is connected with the alternating current-direct current converter (2), then the alternating current-direct current converter (2) is respectively connected with the bidirectional direct current converter (3) and the load (5) through the direct current bus DC, and the bidirectional direct current converter (3) is connected with the high-temperature superconducting energy storage device (4). The utility model discloses an actively technological effect: by utilizing the quick response characteristic of the superconducting magnetic energy storage device, the uninterruptible power supply system in high-voltage direct-current power supply can quickly compensate a high-frequency part (ms level) and a low-frequency part in the problems of harmonic oscillation, instantaneous voltage interruption, instantaneous voltage drop and the like of a power system, while a conventional uninterruptible system can only be used for compensating the low-frequency part.
Description
Technical Field
The utility model relates to an uninterrupted power system among the high voltage direct current power supply especially relates to an uninterrupted power system who has superconductive energy storage.
Background
For a 48V direct current power supply system, alternating current is only required to be transmitted to an electric terminal through a rectification link and a DC/DC conversion link, rectification is not required after the alternating current enters the electric terminal, loss reduction is facilitated, and due to the fact that an inversion link which is prone to failure is omitted in the system, power supply reliability of the system is enhanced, meanwhile, protection equipment for inversion is reduced, and cost input is reduced. However, such 48V dc power supply systems increasingly exhibit their limitations as the power of the consumers increases. Along with the gradual improvement of the power of electric equipment, the requirement on the power of a direct current bus side is higher and higher, cables on the direct current bus side are increased continuously, the investment cost is increased greatly, and therefore the economy of a 48V direct current power supply system is limited greatly and cannot be developed greatly.
Meanwhile, in recent years, uninterruptible power supplies are increasingly widely applied to various fields of national economy. Financial management systems such as banking and stock exchange; the technical fields of communication, aviation and aerospace; industrial and office automation; the petroleum and petrochemical industries; weather and earthquake forecast analysis; business and property management systems; home, personal computer, etc.
At present, the uninterruptible power supply system in the market mostly adopts a conventional storage battery as an energy storage device. However, the conventional storage battery generally has the defects of low energy storage efficiency, slow charging and discharging speed, short service life, possibility of causing environmental pollution and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that solve changes 48V DC power supply system into high voltage DC power supply system, introduces conventional uninterrupted power source system with superconductive magnetism energy memory, can constitute neotype uninterrupted power source system based on superconductive magnetism energy memory.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
an uninterrupted power system in high-voltage direct-current power supply based on superconducting energy storage comprises the following components: the high-temperature superconducting energy storage device comprises an alternating current input 1, an alternating current-direct current converter 2, a bidirectional direct current converter 3, a high-temperature superconducting energy storage device 4 and a load 5, wherein the alternating current input 1 is connected with the alternating current-direct current converter 2, then the alternating current-direct current converter 2 is respectively connected with the bidirectional direct current converter 3 and the load 5 through a direct current bus DC, and the bidirectional direct current converter 3 is connected with the high-temperature superconducting energy storage device 4.
The high-temperature superconducting energy storage device 4 comprises the following components: superconducting coils, a refrigeration system, a current transformer, a protection system and a control system.
The superconducting coil is a ring-shaped high-temperature superconducting energy storage magnet and comprises the following components: the number of single solenoid coils of the ring magnet, 12, determines the dimensions of each single solenoid coil, i.e., the inner radius Ri, the outer radius B0, and the height H of the magnet, and determines the distance R from the center of the single solenoid coil to the center of the ring coil.
The refrigerating system comprises the following components: a current lead, a GM dry refrigerator, a primary and secondary refrigeration heads, a high-temperature superconducting current lead, a radiation screen, a copper plate and a stranded wire bundle.
The converter adopts a 12-pulse current source converter, and is a combination of two 12 pulses formed by four 6-pulse converters and a phase-shifting transformer.
The mechanical superconducting switch used by the control system mainly comprises a driving device, a superconducting block and a positioning device.
The AC-DC converter 2 adopts an improved bridgeless power factor correction structure.
The bidirectional direct current converter 3 adopts a non-isolated bidirectional Buck/Boost direct current conversion structure.
The utility model discloses an actively technological effect:
the largest difference between the high-voltage direct-current power supply system and the alternating-current UPS is that no inversion link exists, and the high-voltage direct-current power supply system can be called as a direct-current uninterruptible power supply or a direct-current UPS. The high-voltage direct current power supply system is called high-voltage direct current power supply because the high-voltage direct current power supply system is firstly applied to the fields of communication internet and the like, and compared with a-48V power supply system in the communication industry, the voltage value of the high-voltage direct current power supply system is usually 200 plus 400V, which is far higher than the voltage adopted in the existing communication industry;
by utilizing the quick response characteristic of the superconducting magnetic energy storage device, the novel uninterrupted power supply system can quickly compensate a high-frequency part (ms level) and a low-frequency part in the problems of harmonic oscillation, instantaneous voltage interruption, instantaneous voltage reduction and the like of a power system, while a conventional uninterrupted system can only be used for compensating the low-frequency part.
Drawings
Fig. 1 is a diagram of a composition of an uninterruptible power supply system in a high-voltage direct-current power supply based on superconducting energy storage.
Fig. 2 is a block diagram of the structure of the high-temperature superconducting energy storage device.
Fig. 3 is a ring-shaped high temperature superconducting energy storage magnet.
Fig. 4 is a schematic diagram of a refrigeration system of a high temperature superconducting energy storage device.
Fig. 5 is a structural composition diagram of the current transformer.
Fig. 6 is a structural view of a mechanical superconducting switch.
Fig. 7 is a structural diagram of an improved bridgeless power factor correction.
Fig. 8 is a structure diagram of non-isolated bidirectional Buck/Boost direct current conversion.
In the figure: 1 is an alternating current input, 2 is an alternating current-direct current converter, 3 is a bidirectional direct current converter, 4 is a high-temperature superconducting energy storage device, and 5 is a load.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
1. Integral implementation scheme of uninterruptible power supply system in high-voltage direct-current power supply based on superconducting energy storage
An uninterrupted power system in high-voltage direct-current power supply based on superconducting energy storage comprises the following components: the high-temperature superconducting energy storage device comprises an alternating current input 1, an alternating current-direct current converter 2, a bidirectional direct current converter 3, a high-temperature superconducting energy storage device 4 and a load 5, wherein the alternating current input 1 is connected with the alternating current-direct current converter 2, then the alternating current-direct current converter 2 is respectively connected with the bidirectional direct current converter 3 and the load 5 through a direct current bus DC, and the bidirectional direct current converter 3 is connected with the high-temperature superconducting energy storage device 4. As shown in fig. 1.
The high-temperature superconducting energy storage device 4 comprises the following components: superconducting coils, a refrigeration system, a current transformer, a protection system and a control system. As shown in fig. 2.
The superconducting coil is a ring-shaped high-temperature superconducting energy storage magnet and comprises the following components: the number of single solenoid coils of the ring magnet, 12, determines the dimensions of each single solenoid coil, i.e., the inner radius Ri, the outer radius B0, and the height H of the magnet, and determines the distance R from the center of the single solenoid coil to the center of the ring coil. As shown in fig. 3.
The refrigerating system comprises the following components: a current lead, a GM dry refrigerator, a primary and secondary refrigeration heads, a high-temperature superconducting current lead, a radiation screen, a copper plate and a stranded wire bundle. As shown in fig. 4.
The converter adopts a 12-pulse current source converter, and is a combination of two 12 pulses formed by four 6-pulse converters and a phase-shifting transformer. As shown in fig. 5.
The mechanical superconducting switch used by the control system mainly comprises a driving device, a superconducting block and a positioning device. As shown in fig. 6.
The AC-DC converter 2 adopts an improved bridgeless power factor correction structure. As shown in fig. 7.
The bidirectional direct current converter 3 adopts a non-isolated bidirectional Buck/Boost direct current conversion structure. As shown in fig. 8.
2. High-temperature superconducting energy storage device
The main components of the superconducting magnetic energy storage system include a superconducting coil, a cryogenic container, a refrigeration system, a converter, a control system, a protection system, and the like, and the principle of the structure is shown in fig. 2. Since the superconducting coils are operated under direct current, they must be energized by the power grid through the rectifier device and then supplied to the power grid or the load through the inverter device. Therefore, power electronic devices such as converters, choppers, and filters are important components for converting and transmitting energy among superconducting coils, a grid, and a load.
3. Annular high-temperature superconducting energy storage magnet
The annular high temperature superconducting energy storage magnet is composed of a plurality of short solenoid coils, as shown in fig. 3. It can be seen from the figure that the optimum design includes selecting the number N of single solenoid coils that make up the ring magnet, determining the dimensions of each single solenoid coil, i.e., the inner radius Ri, outer radius B0 and height H of the magnet, and determining the distance R from the center of the single solenoid coil to the center of the ring coil. As shown in fig. 3.
4. Refrigeration system
It comprises the following components: a current lead, a GM dry refrigerator, a primary and secondary refrigeration heads, a high-temperature superconducting current lead, a radiation screen, a copper plate and a stranded wire bundle. As shown in fig. 4.
5. Current transformer
As shown in fig. 5. Four 6-pulse current transformers and phase-shifting transformers constitute a combination of two 12 pulses. By adjusting the trigger angle of the turn-off thyristor, the phase angle of the two 12-pulse current transformers can be different by 15 degrees, so that quasi 24-pulse alternating-current side voltage is generated. Compared with a standard 24-pulse converter, the method avoids a special expensive transformer. Although the alternating-current side voltage contains 11 and 13 harmonics, the amplitude of the alternating-current side voltage is about 1 percent of the fundamental wave, and the alternating-current side voltage is easy to filter.
6. Mechanical superconducting switch
The mechanical superconductive switch is another new type of superconductive switch and its structure mainly includes driving device, superconductive block material, positioning device, etc. The mechanical superconducting switch realizes the on-off of the switch by driving the mechanical contact and separation of the superconducting block materials through the driving device, so that the off resistance of the mechanical superconducting switch can reach infinity. The switch driving device can adopt a pair of parallel superconducting coils, and generates repulsive force or attractive force by changing the current magnitude and direction between the two superconducting coils. The superconducting switch block is a pair of superconducting contacts with good contact surfaces and a stable matrix is added. The main function of the fixed device is to ensure that the movable contact strictly realizes radial matching with the fixed contact in the opening or closing process. The switch superconducting block can be made of easily processed NbTi low-temperature superconducting material or YBCO high-temperature superconducting material working in a liquid nitrogen temperature zone. A typical mechanical superconducting switching device is shown in fig. 6. The mechanical driving device is used for realizing mechanical contact or separation of the superconducting bulk materials, the constant current source is used for supplying power to the superconducting bulk materials, and the terminal voltage of the superconducting bulk materials can be measured by adopting a four-lead method.
7. Improved bridgeless power factor correction structure
The basically bridgeless power factor correction structure is proposed to be applied quickly and obtain good effect in application practice, and meanwhile, the structure is found to have some defects and is not ideal. The traditional bridgeless power factor correction structure has no preceding stage rectifier bridge, so that an input side power supply and an input side boost inductor are directly connected. The inductance has the characteristics of low pass frequency and high stop frequency, and if the frequency is extremely large, the inductance is equivalent to open circuit. The output of the bridgeless power factor correction structure exhibits a floating state due to being isolated from the input side power supply, with the direct consequence that the EMI (electromagnetic interference) phenomenon is particularly severe, and in addition, the detection of the input side voltage and current is also very difficult. Because of these problems, the present invention employs an improved version of the basic bridgeless power correction architecture, as shown in fig. 3.
The working principle of the improved bridgeless power factor correction structure is as follows: when the input side alternating voltage is at an upper half shaft, the power switch tube Q1 is in a switch state controlled by a PWM switch, the switch tube Q2 is in an off state, the Q1 is connected, the input current passes through the input side boosting inductor, the Q1 enters a power supply through the D4 to form a loop, the process of charging the boosting inductor is performed, when the Q1 is off, the current passes through L, D1, C, the load and the D4 to form a loop, and the inductor is in a discharging state; when the input voltage is negative, the Q2 is conducted, the current passes through the switching tube Q2, the D1 and the L to form a loop, the process of charging the inductor is the same, when the Q2 is turned off, the current passes through the D2, the C and the load, and the L to form a loop, and the inductor is in a discharging state.
The improved bridgeless power factor correction structure has two more diodes, the structure is more complex, the devices are more, more investment is necessary, however, one inductor is relatively less, the consumption of diodes in the switch tube is reduced, and the consumption of the inductor is also reduced.
The improved bridgeless power factor correction structure enables current to change the flowing direction, no matter what state the switching tube is in when the input voltage is larger than zero, the current finally returns to a power supply through D3, and when the input voltage is smaller than zero, the current finally returns to the power supply through D4, so that the current is prevented from passing through a diode in the switching tube; meanwhile, only one inductor is used in the structure, so that the inductor consumption is reduced;
the improved circuit provides a conduction path with small impedance for high-frequency signals by adding two diodes, and EMI electromagnetic interference can be reduced by symmetry while the input current is much easier to sample.
8. Non-isolated bidirectional Buck/Boost direct current conversion structure
Because under the situation that input voltage and output voltage transformation ratio are not more than 3, use non-isolated direct current converter simple structure, control method is simple reliable, and more importantly reduces high frequency transformer's loss, the utility model discloses a non-isolated two-way half bridge type direct current converter adopts double-phase crisscross parallel half bridge type direct current converter in order to reduce the electric current ripple, is favorable to the battery performance, and its structure is as shown 4, also is called as non-isolated two-way Buck/Boost direct current converter.
The non-isolated bidirectional Buck/Boost direct-current converter consists of a Boost (Boost) mode and a Buck (Buck) mode. For a direct current uninterruptible power supply, 380 direct current voltage is output, power is supplied to a storage battery through a bidirectional Buck/Boost direct current converter, the voltage needs to be reduced to a certain degree in order to reduce the cost of the storage battery, the voltage cannot be reduced too low due to the fact that the rated power of a load is 5KW, the voltage of the storage battery cannot be provided with the rated power, the voltage of the storage battery is selected to be 168V under the condition of comprehensive consideration, and the cost of the storage battery is reduced by nearly half compared with a wide bus connection mode of the storage battery. When the direct current voltage output by the rectifying module charges the storage battery, the power switch tubes Q1 and Q3 are in a switching state,
and the power switch tubes Q2 and Q4 are in an off state and act as diodes in a Buck circuit, and the bidirectional Buck/Boost circuit can be regarded as an interleaved parallel Buck/Boost circuit. When the system is suddenly powered off, the backup battery is quickly boosted to 380V through the bidirectional Buck/Boost converter to provide energy for the load. When the bidirectional direct current converter is in a discharging and boosting mode, the power switch tubes Q2 and Q4 are in a switching state, the power switch tubes Q1 and Q3 are in a turn-off state and act as diodes in a Boost circuit, and at the moment, the bidirectional Buck/Boost direct current converter can be regarded as an interleaved parallel Buck/Boost circuit. When the storage battery supplies power to the load, the voltage of the storage battery is very low, the output current is very large, and the staggered parallel connection structure can play a role in reducing the current passing through the power switch device.
Claims (8)
1. An uninterrupted power system in high-voltage direct-current power supply based on superconducting energy storage comprises the following components: AC input (1), AC-DC converter (2), two-way DC converter (3), high temperature superconducting energy storage device (4), load (5), its characterized in that: the alternating current input (1) is connected with the alternating current-direct current converter (2), then the alternating current-direct current converter (2) is respectively connected with the bidirectional direct current converter (3) and the load (5) through the direct current bus DC, and the bidirectional direct current converter (3) is connected with the high-temperature superconducting energy storage device (4).
2. The uninterruptible power supply system in high voltage direct current power supply of claim 1, wherein: the high-temperature superconducting energy storage device (4) comprises the following components: superconducting coils, a refrigeration system, a current transformer, a protection system and a control system.
3. The uninterruptible power supply system in high voltage direct current power supply of claim 2, wherein: the superconducting coil is a ring-shaped high-temperature superconducting energy storage magnet and comprises the following components: the number of single solenoid coils of the ring magnet, 12, determines the dimensions of each single solenoid coil, i.e., the inner radius Ri, the outer radius B0, and the height H of the magnet, and determines the distance R from the center of the single solenoid coil to the center of the ring coil.
4. The uninterruptible power supply system in high voltage direct current power supply of claim 2, wherein: the refrigerating system comprises the following components: a current lead, a GM dry refrigerator, a primary and secondary refrigeration heads, a high-temperature superconducting current lead, a radiation screen, a copper plate and a stranded wire bundle.
5. The uninterruptible power supply system in high voltage direct current power supply of claim 2, wherein: the converter adopts a 12-pulse current source converter, and is a combination of two 12 pulses formed by four 6-pulse converters and a phase-shifting transformer.
6. The uninterruptible power supply system in high voltage direct current power supply of claim 2, wherein: the mechanical superconducting switch used by the control system mainly comprises a driving device, a superconducting block and a positioning device.
7. The uninterruptible power supply system in high voltage direct current power supply of claim 1, wherein: the AC-DC converter (2) adopts an improved bridgeless power factor correction structure.
8. The uninterruptible power supply system in high voltage direct current power supply of claim 1, wherein: the bidirectional direct current converter (3) adopts a non-isolated bidirectional Buck/Boost direct current conversion structure.
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| CN201921425122.XU CN210957901U (en) | 2019-08-29 | 2019-08-29 | Uninterrupted power supply system in high-voltage direct-current power supply based on superconducting energy storage |
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| CN201921425122.XU CN210957901U (en) | 2019-08-29 | 2019-08-29 | Uninterrupted power supply system in high-voltage direct-current power supply based on superconducting energy storage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116741493A (en) * | 2023-08-09 | 2023-09-12 | 中国科学院合肥物质科学研究院 | Fusion reactor superconducting magnet system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116741493A (en) * | 2023-08-09 | 2023-09-12 | 中国科学院合肥物质科学研究院 | Fusion reactor superconducting magnet system |
| CN116741493B (en) * | 2023-08-09 | 2023-11-10 | 中国科学院合肥物质科学研究院 | Fusion reactor superconducting magnet system |
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Granted publication date: 20200707 Termination date: 20210829 |