Self-starting inertia flywheel device with UPS (Uninterrupted Power Supply)

Abstract

The utility model relates to the technical field of inertia flywheels, in particular to a self-starting inertia flywheel device with a UPS (Uninterrupted Power Supply), which improves the stability and the reliability of a power system and solves the problems of complex starting and low running reliability of an inertia flywheel system. Comprising an energy storage flywheel, a UPS motor, an electromagnetic coupler, a synchronous phase modifier, a rectifier, a direct-current bus, a first converter and a second converter. A flywheel rotor of the energy storage flywheel is directly connected with a UPS motor rotor and an inner rotor of the electromagnetic coupler through a mechanical rotating shaft; an outer rotor of the electromagnetic coupler is directly connected with a rotor of the synchronous phase modifier through a mechanical rotating shaft; a stator winding of the synchronous phase modifier is directly connected into a power grid; the rectifier converts power frequency alternating current in a power grid into direct current to supply power to the direct-current bus. The first converter can convert alternating current generated by the UPS motor into direct current to supply power to the direct-current bus, and can also invert current at the direct-current end into alternating current to take power from the direct-current bus.

Description

Technical Field

[0001] This utility model relates to the technical field of inertia flywheels, and in particular to a self-starting inertia flywheel device with UPS power supply. Background Technology

[0002] As the proportion of new energy sources in the power system continues to increase, the power system faces problems such as insufficient inertia and difficulties in frequency regulation. Traditional power generation equipment, such as coal-fired and nuclear power generation equipment, has a large rotational inertia, which can maintain the stability of the grid frequency. However, the large-scale integration of distributed new energy sources such as wind and solar power has disrupted the original inertia balance, resulting in insufficient power system inertia and increased frequency fluctuations.

[0003] Among the technical means to solve these problems, synchronous condensers mainly provide inertial support by adjusting the mechanical rotational inertia of the rotor, but cannot generate active power; energy storage technology can provide rapid active power regulation capability, but its inertia is relatively small. As a new type of frequency regulation device, the inertia flywheel combines the advantages of both, providing stable inertial support and achieving rapid active power regulation, and has good application prospects.

[0004] However, inertial flywheel systems using electromagnetic couplers are currently still in the theoretical stage and face numerous technical challenges. On the one hand, their starting methods are complex; traditional starting methods often require auxiliary motors, increasing system cost and complexity. On the other hand, the complex structure of inertial flywheel systems makes it difficult to guarantee their reliability when the power grid experiences faults. Therefore, developing a self-starting inertial flywheel device with a UPS power supply is of great significance for improving the stability and reliability of power systems. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a self-starting inertia flywheel device with UPS power supply, which improves the stability and reliability of power systems and solves the problems of complex startup and low operational reliability of inertia flywheel systems.

[0006] This utility model discloses a self-starting inertia flywheel device with UPS power supply, comprising an energy storage flywheel, a UPS motor, an electromagnetic coupler, a synchronous condenser, a rectifier, a DC bus, a converter one, and a converter two. The flywheel rotor of the energy storage flywheel is directly connected to the rotor of the UPS motor and the inner rotor of the electromagnetic coupler via a mechanical shaft. The outer rotor of the electromagnetic coupler is directly connected to the rotor of the synchronous condenser via a mechanical shaft. The stator winding of the synchronous condenser is directly connected to the power grid. The rectifier converts the AC power from the power grid into DC power to supply the DC bus. Converter one can convert the AC power generated by the UPS motor into DC power to supply the DC bus, or it can invert the DC current into AC power to draw power from the DC bus. Converter two can invert the DC current into AC power of the required frequency and supply it to the outer rotor winding of the electromagnetic coupler.

[0007] Furthermore, the UPS motor is a permanent magnet synchronous motor.

[0008] Furthermore, the inner rotor of the electromagnetic coupler is made of permanent magnet material.

[0009] Furthermore, the frequency of the electrical energy generated by the synchronous condenser is consistent with the frequency of the power grid.

[0010] Furthermore, the rectifier includes multiple rectifier elements, which are diodes or thyristors, and realizes the conversion of AC to DC through the rectifier circuit.

[0011] Furthermore, the DC bus is wrapped with insulating material.

[0012] Furthermore, both converter one and converter two include power switching devices, which are insulated-gate bipolar transistors or metal-oxide-semiconductor field-effect transistors.

[0013] Furthermore, it also includes a mechanical locking device for locking and unlocking the energy storage flywheel rotor, the mechanical locking device being installed on a mechanical shaft connecting the energy storage flywheel and the rotor inside the electromagnetic coupler.

[0014] Furthermore, it also includes a detection module for detecting the voltage amplitude, voltage frequency and harmonic content of the power grid, and the detection module is communicatively connected to converter one and converter two.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. By setting up a UPS motor, in this self-starting inertia flywheel device with UPS power supply, the flywheel rotor of the energy storage flywheel is directly connected to the rotor of the UPS motor. The UPS motor can realize the self-starting of the device, avoiding the need for an auxiliary motor in the traditional starting method, and reducing system cost and complexity.

[0017] 2. It integrates the advantages of inertia flywheel, synchronous condenser and energy storage technology. The energy storage flywheel can provide stable inertia support. At the same time, with the cooperation of related components, it can achieve rapid active power regulation, effectively addressing the problems of insufficient power system inertia and increased frequency fluctuation caused by the large-scale integration of new energy sources, and improving the stability of the power system.

[0018] 3. When a power grid failure occurs, the reliability of operation is enhanced to a certain extent and the impact of the failure on the operation of the device is reduced by the connection and functional coordination between various components and the use of components such as UPS power supplies.

[0019] 4. Multiple forms of energy conversion are achieved through converter one and converter two, which improves the device's adaptability to different operating conditions and energy utilization efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the electromagnetic coupler required by this utility model;

[0023] The following are labels in the attached diagram: 1. Energy storage flywheel; 2. UPS motor; 3. Electromagnetic coupler; 31. Inner rotor; 32. Outer rotor; 4. Synchronous condenser; 5. Rectifier; 6. DC bus; 7. Converter 1; 8. Converter 2; 9. Mechanical locking component; 10. Detection module. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] like Figures 1 to 2 As shown, this utility model discloses a self-starting inertia flywheel device with UPS power supply, comprising an energy storage flywheel 1, a UPS motor 2, an electromagnetic coupler 3, a synchronous condenser 4, a rectifier 5, a DC bus 6, a converter 1 7, and a converter 2 8. The flywheel rotor of the energy storage flywheel 1 is directly connected to the rotor of the UPS motor 2 and the inner rotor 31 of the electromagnetic coupler 3 via a mechanical shaft. The outer rotor 32 of the electromagnetic coupler 3 is directly connected to the rotor of the synchronous condenser 4 via a mechanical shaft. The stator winding of the synchronous condenser 4 is directly connected to the power grid. The rectifier 5 converts the AC power from the power grid into DC power to supply the DC bus 6. The converter 1 7 can convert the AC power generated by the UPS motor 2 into DC power to supply the DC bus 6, or it can invert the DC current into AC power to draw power from the DC bus 6. The converter 2 8 can invert the DC current into AC power of the required frequency and supply it to the outer rotor 32 winding of the electromagnetic coupler 3.

[0026] In this embodiment, the energy storage flywheel 1, the electromagnetic coupler 3, and the synchronous condenser 4 cooperate to achieve an organic combination of inertia support and active power regulation. The energy storage flywheel 1, with its large inertia, accelerates or decelerates its rotor (connected to the inner rotor 31 of the electromagnetic coupler 3) to store or release energy during power system frequency fluctuations, providing mechanical inertia support and stabilizing the grid frequency. The synchronous condenser 4 utilizes the torque transmitted by the outer rotor 32 of the electromagnetic coupler 3 to adjust its own mechanical rotational inertia, further enhancing the system's inertia support capability. Simultaneously, through the collaboration of the energy storage flywheel 1 and the UPS motor 2, and with the assistance of converter 7 and converter 2... The power conversion control of the 8-phase system enables rapid active power regulation, compensating for the volatility of new energy power generation and effectively solving the problems of insufficient power system inertia and frequency regulation difficulties. The self-starting function is achieved through electromagnetic coupler 3 and converter 8. During startup, converter 8 inverts the DC-side current into AC power of a suitable frequency and supplies it to the outer rotor 32 winding of electromagnetic coupler 3, generating electromagnetic torque. Under the action of this electromagnetic torque, the inner rotor 31 of electromagnetic coupler 3 drives the flywheel rotor of the connected energy storage flywheel 1 and the rotor of the UPS motor 2 to rotate, thereby causing the rotor of the synchronous condenser 4 to rotate as well, achieving system self-starting. This process requires no auxiliary equipment. The electric motor simplifies the startup process, reduces system cost and complexity, and improves startup reliability and convenience. Using UPS motor 2 as a backup power source greatly enhances system reliability and fault tolerance. During normal grid operation, the electromagnetic coupler 3 is powered by the grid through rectifier 5, DC bus 6, and converter 2 8. Converter 7 on the UPS motor 2 side is not operational. When a grid fault occurs, such as when voltage amplitude, frequency, or harmonic content exceeds the specified range, the switch at converter 7 on the UPS motor 2 side closes, and converter 7 starts operating. At this time, it controls the grid-side converter, i.e., converter 2 8, to quickly increase its power output. Once the power on the grid side reaches 0, the switch at the grid-side converter is opened, and the electromagnetic coupler 3 is powered entirely by the UPS motor 2 through the converter 7 and DC bus 6, ensuring that the system can still operate normally during grid faults. When the grid returns to normal, the switch at the grid-side converter is closed, and the converter 8 starts working, controlling the converter 7 on the UPS motor 2 side to bring its power to 0 as quickly as possible. When the power of the UPS motor 2 reaches 0, the switch at the converter 7 on the UPS motor 2 side is opened, and the electromagnetic coupler 3 is once again powered entirely by the grid, realizing a smooth switching of the system before and after grid faults and ensuring the stable operation of the power system.Rectifier 5 converts the AC power from the power grid into DC power, providing a stable DC power supply to DC bus 6 and ensuring a stable power supply for the entire device. Converter 7 converts electrical energy bidirectionally to meet the operating requirements under different working conditions. Converter 8 inverts the DC-side current into AC power of the required frequency and supplies it to the outer rotor 32 winding of electromagnetic coupler 3, precisely controlling the operating state of electromagnetic coupler 3 and achieving precise regulation of the energy storage and release process of energy storage flywheel 1, thereby improving energy utilization efficiency.

[0027] In one embodiment of this utility model, the UPS motor 2 is a permanent magnet synchronous motor. The permanent magnet synchronous motor has a high power factor and efficiency. When the power grid fails and the UPS motor 2 operates as a backup power source, its high power factor reduces reactive power loss, converting more electrical energy into mechanical energy to drive the rotor 31 inside the electromagnetic coupler 3, thereby driving the energy storage flywheel 1 and the synchronous condenser 4 to maintain operation. Simultaneously, high efficiency means that more mechanical energy can be output with the same amount of electricity, ensuring continuous and stable operation during faults, reducing energy waste, and improving energy utilization efficiency. The permanent magnet synchronous motor has excellent speed regulation performance. Through precise control of its power supply frequency and voltage via the converter 7, it can quickly respond to system demands. During power grid faults or recovery processes, the motor speed can be flexibly adjusted, working in conjunction with the electromagnetic coupler 3, the energy storage flywheel 1, and the synchronous condenser 4. The permanent magnet synchronous motor (PMSM) has a simple and compact structure, without complex brushes and commutators, reducing the probability of failure. During operation, this characteristic reduces maintenance workload and downtime, improving overall reliability. Furthermore, its rotor uses permanent magnet materials, generating a stable magnetic field that ensures smooth motor output torque, providing stable power support and enhancing operational stability under various conditions. The PMSM also boasts a fast dynamic response, enabling rapid startup and stable operation in the event of a grid fault, promptly supplying power to the electromagnetic coupler 3 and preventing shutdown due to grid failure. When the grid returns to normal, it quickly adjusts its operating state, stopping power supply and switching to standby mode. This rapid response capability ensures continuous operation of the device under abnormal grid conditions, effectively improving the reliability of the power system.

[0028] In one embodiment of this utility model, the inner rotor 31 of the electromagnetic coupler 3 is made of permanent magnet material. The permanent magnet material has high remanence and coercivity, enabling the inner rotor 31 to generate a stable and strong magnetic field. When the converter 8 supplies alternating current to the outer rotor 32 winding of the electromagnetic coupler 3, the alternating magnetic field generated by the outer rotor 32 interacts with the permanent magnet magnetic field of the inner rotor 31. According to the law of electromagnetic induction, this interaction generates electromagnetic torque on the inner rotor 31. Due to the stability of the permanent magnet magnetic field, the transmission efficiency of the electromagnetic torque is higher, enabling more effective rotation of the flywheel rotor of the energy storage flywheel 1 and the rotor of the UPS motor 2, achieving efficient energy conversion and transfer in energy storage. During the energy storage process of flywheel 1, a positive current is supplied to the winding of outer rotor 32. The magnetic field speed of outer rotor 32 is faster than that of inner rotor 31. Under the action of a stable permanent magnetic field, the permanent magnet of inner rotor 31 is subjected to a stable positive electromagnetic torque, which drives the flywheel rotor to accelerate energy storage and reduce energy loss. In addition, compared with the traditional electrically excited rotor, the complex winding structure and power supply line are reduced, making the overall structure of electromagnetic coupler 3 more compact and simple. This not only reduces the manufacturing difficulty and cost of electromagnetic coupler 3, but also reduces the failure points and improves reliability and stability. At the same time, the simplified structure also helps to reduce the size and weight of the device, improve space utilization, and make it easier to install and maintain.

[0029] In one embodiment of this utility model, the frequency of the electrical energy generated by the synchronous condenser 4 is consistent with the grid frequency. The rotor speed of the synchronous condenser 4 has a fixed synchronous relationship with the frequency of the generated electrical energy. When the grid frequency fluctuates due to the instability of new energy power generation, the synchronous condenser 4, with its large moment of inertia and under the connection of the electromagnetic coupler 3, can absorb or release energy to adjust the rotor speed, thereby keeping the frequency of the generated electrical energy consistent with the grid frequency. When wind or solar power generation suddenly increases and the grid frequency shows an upward trend, the rotor of the synchronous condenser 4 lags behind due to inertial speed changes, and its relative to the grid frequency is in a "deceleration" state. At this time, through the electromagnetic coupler 3, it obtains energy from the energy storage flywheel 1 to increase its own speed, generate more electrical energy, suppress the rise in grid frequency, maintain frequency stability, and ensure the reliable operation of the power system. The electrical energy output consistent with the grid frequency causes the electromotive force of its stator winding to be in a frequency-consistent relationship with the grid voltage. The frequency, phase, and amplitude are easier to match. During grid connection, the phase difference, frequency difference, and voltage difference between the two are small, which can effectively reduce the inrush current and electromagnetic torque generated during grid connection, reduce damage to the power grid and the synchronous condenser 4 itself, and achieve smooth and seamless grid connection operation. This not only improves the success rate of grid connection, but also avoids equipment failure and grid fluctuations caused by grid connection impact, ensuring that the power system can operate stably under different operating conditions. The power output with the same frequency as the grid can reduce harmonics and voltage fluctuations. If the frequency of the power output by the synchronous condenser 4 is inconsistent with the frequency of the grid, harmonic currents will be generated in the grid, causing voltage waveform distortion, affecting power quality, and damaging other equipment in the power system. Maintaining frequency consistency can effectively avoid this situation, ensure the stability of voltage and current waveforms in the grid, provide high-quality power to various electrical equipment, and improve the operating efficiency and reliability of the power system.

[0030] In one embodiment of this utility model, the rectifier 5 includes multiple rectifier elements, which are diodes or thyristors. The rectifier circuit realizes the conversion of AC to DC. The diode converts AC to DC through its unidirectional conductivity. In addition to its unidirectional conductivity, the thyristor can also control its conduction time by controlling the gate signal to achieve controllable rectification. When multiple diodes or thyristors are used in parallel, the current can be shared, increasing the rated current of the rectifier 5 so that it can adapt to the power conversion needs of higher power. Moreover, even if one of the rectifier elements fails, the other elements can continue to work, so that the entire rectifier 5 will not completely fail, thereby improving the fault tolerance of the device, ensuring the stability of the power supply of the DC bus 6, and thus ensuring the stable operation of the entire inertia flywheel device.

[0031] In one embodiment of this utility model, the DC bus 6 is wrapped with insulating material. The insulating material has high resistance characteristics. When the converter 7 and the converter 8 are performing power conversion, the insulated DC bus 6 can ensure that their input and output DC power will not interfere with each other due to leakage, maintain the normal operation of each part of the circuit, and improve safety. The insulating material helps to stabilize the DC voltage. When the grid voltage fluctuates or the converter generates harmonics, the insulated DC bus 6 can prevent these interference signals from impacting the DC voltage, ensuring that the converter 7 and the converter 8 obtain a stable DC input voltage, so that they can perform power conversion more stably, provide a stable power supply for the electromagnetic coupler 3 and the UPS motor 2, and ensure the reliable operation of the entire device.

[0032] In one embodiment of this utility model, both converter 7 and converter 8 include power switching devices, which are insulated-gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs). IGBTs have high voltage and high current handling capabilities, meeting the requirements of converters when handling large-power energy conversion. During device operation, when rapid adjustment of the energy state of the energy storage flywheel 1 is needed, or when the UPS motor 2 supplies power to the system during a grid failure, large-power energy conversion is involved. IGBTs can stably control the circuit's on / off state, ensuring efficient energy transmission. Simultaneously, their on-state voltage drop is low, resulting in minimal energy loss during conduction, effectively improving the converter's efficiency. The high efficiency of the converter reduces energy waste. Furthermore, its fast switching speed allows for rapid circuit switching on and off, quickly responding to the system's control requirements for power conversion and improving the device's dynamic performance. The extremely fast switching speed of the metal-oxide-semiconductor field-effect transistor (MOSFET) enables the converter to quickly respond to system control signals, achieving rapid power conversion and precise regulation. Simultaneously, its high input impedance minimizes the power required by the gate drive circuit during control, reducing power consumption and improving the overall system's energy efficiency. Moreover, its good thermal stability allows for effective heat dissipation during operation, ensuring stable long-term operation and reducing the risk of failure due to overheating.

[0033] In one embodiment of this utility model, a mechanical locking member 9 for locking and unlocking the flywheel rotor of the energy storage flywheel 1 is further included. The mechanical locking member 9 is installed on the mechanical shaft connecting the energy storage flywheel 1 and the inner rotor 31 of the electromagnetic coupler 3. The mechanical locking member 9 uses mechanical structures, such as pawls and locking pins, to fix the flywheel rotor of the energy storage flywheel 1 to the connected mechanical shaft, restricting its rotation. During the system startup phase, the flywheel rotor of the energy storage flywheel 1 is locked by the mechanical locking member 9. At this time, the inner rotor 31 of the electromagnetic coupler 3 is relatively fixed, and the outer rotor 32 is connected to the rotor of the synchronous condenser 4, thus starting the synchronization. When condensing the synchronous condenser 4, the inertia of the energy storage flywheel 1 can be avoided from interfering with the startup process, allowing the synchronous condenser 4 to accelerate to its rated speed and complete grid connection more smoothly. After the synchronous condenser 4 is connected to the grid, the mechanical locking part 9 is unlocked and the flywheel rotor of the energy storage flywheel 1 is started. This step-by-step startup method helps to optimize the startup process, reduce startup difficulty, and improve the stability and reliability of system startup. When maintaining or repairing the energy storage flywheel 1, electromagnetic coupler 3, or other related components, the mechanical locking part 9 is used to lock the flywheel rotor to prevent accidental rotation and provide safety for maintenance personnel.

[0034] In one embodiment of this utility model, a detection module 10 is further included for detecting the voltage amplitude, frequency, and harmonic content of the power grid. The detection module 10 is communicatively connected to converter 7 and converter 8. The detection module 10 typically includes components such as voltage sensors and frequency sensors to monitor the voltage amplitude, frequency, and harmonic content of the power grid in real time, enabling timely detection of power grid anomalies. When the voltage amplitude of the power grid is too high or too low, the frequency fluctuation exceeds the allowable range, or the harmonic content exceeds the standard, the detection module 10 quickly transmits this information to converter 7 and converter 8. The converters adjust their operating status accordingly to avoid damage to equipment such as the energy storage flywheel 1 and the synchronous condenser 4 caused by power grid anomalies, ensuring stable operation. When the power grid voltage drops sharply, converter 8 can adjust the current frequency and magnitude of the external rotor 32 of the electromagnetic coupler 3 to maintain the coordinated operation of the energy storage flywheel 1 and the synchronous condenser 4, preventing system instability.

[0035] The working principle of this utility model of a self-starting inertia flywheel device with UPS power supply is as follows:

[0036] During the startup phase, the flywheel rotor of the energy storage flywheel 1 is first locked using mechanical locking element 9. At this time, the inner rotor 31 of the electromagnetic coupler 3 is stationary, while the outer rotor 32 is movable. The converter 2 8 adjusts the frequency and magnitude of the current output to the winding of the outer rotor 32 of the electromagnetic coupler 3, causing the outer rotor 32 to rotate under the action of electromagnetic torque, which drives the rotor of the synchronous condenser 4 connected to it to rotate. The current is continuously adjusted to accelerate the outer rotor 32 and the synchronous condenser 4 to their rated speed. When the amplitude, phase, phase sequence, and frequency of the voltage at the terminal of the synchronous condenser 4 are consistent with the grid, grid connection is completed. The mechanical locking element 9 is unlocked, and the converter 2 8 adjusts the frequency and magnitude of the output current again, changing the electromagnetic torque on the inner rotor 31 of the electromagnetic coupler 3, causing the inner rotor 31 to drive the flywheel rotor of the energy storage flywheel 1 to start. The current is continuously adjusted to accelerate the inner rotor 31 and the flywheel rotor to their rated speed, at which point the system completes self-starting.

[0037] During normal operation, the power grid supplies power normally. Rectifier 5 converts the power grid's AC frequency to DC to supply power to DC bus 6. Converter 8 inverts the DC current of DC bus 6 into AC and supplies it to the winding of the outer rotor 32 of electromagnetic coupler 3. When the current is positive, the permanent magnet of the inner rotor 31 of electromagnetic coupler 3 experiences positive electromagnetic torque, driving the flywheel rotor of energy storage flywheel 1 to accelerate energy storage. When the current is negative, it decelerates and releases energy. Synchronous condenser 4 provides reactive power support to the power grid by changing its own excitation control reactive power output. At the same time, detection module 10 monitors the power grid voltage amplitude, voltage frequency, and harmonic content in real time and transmits the data to converter 7 and converter 8 to optimize system operation.

[0038] The detection module 10 detects that the voltage amplitude, voltage frequency, or harmonic content of the power grid exceeds the specified range, determines that there is a power grid fault, and sends a signal to converter 7 and converter 8. Converter 7 controls the UPS motor 2 to start, and the switch at the converter on the side of UPS motor 2 is closed. Converter 7 converts the AC power generated by UPS motor 2 into DC power for use by DC bus 6. At the same time, converter 8 controls the power on the power grid side to be reduced to 0 as soon as possible. When the power on the power grid side reaches 0, the switch at the converter on the power grid side is opened, and the electromagnetic coupler 3 is completely powered by UPS motor 2 to maintain system operation.

[0039] After the power grid returns to normal, the detection module 10 detects that the power grid parameters have returned to the normal range and sends signals to converter 7 and converter 8. The switch at converter 8 on the power grid side closes, and converter 8 starts to work, controlling converter 7 on the UPS motor 2 side to bring its power to 0 as soon as possible. When the power of UPS motor 2 reaches 0, the switch at the converter on the UPS motor 2 side opens, the electromagnetic coupler 3 is powered by the power grid again, and the system returns to normal operation.

[0040] The present invention relates to a self-starting inertia flywheel device with UPS power supply. Its installation, connection or setting methods are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A self-starting inertial flywheel apparatus with an UPS power supply, characterized by, The energy storage flywheel (1), the UPS motor (2), the electromagnetic coupler (3), the synchronous phase modifier (4), the rectifier (5), the DC bus (6), the converter I (7) and the converter II (8) are included; the flywheel rotor of the energy storage flywheel (1) is directly connected with the rotor of the UPS motor (2) and the inner rotor (31) of the electromagnetic coupler (3) through a mechanical rotating shaft; the outer rotor (32) of the electromagnetic coupler (3) is directly connected with the rotor of the synchronous phase modifier (4) through a mechanical rotating shaft; the stator winding of the synchronous phase modifier (4) is directly connected with the power grid; the rectifier (5) converts the power frequency alternating current in the power grid into direct current to supply power to the DC bus (6); the converter I (7) can convert the alternating current generated by the UPS motor (2) into direct current to supply power to the DC bus (6), and can also convert the direct current into alternating current to take power from the DC bus (6); the converter II (8) can convert the direct current into alternating current of the required frequency and pass it into the winding of the outer rotor (32) of the electromagnetic coupler (3).

2. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The UPS motor (2) is a permanent magnet synchronous motor.

3. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The inner rotor (31) of the electromagnetic coupler (3) is made of permanent magnet material.

4. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The frequency of the electric energy generated by the synchronous phase modifier (4) is consistent with the frequency of the power grid.

5. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The rectifier (5) includes a plurality of rectifier elements, which are diodes or thyristors, and realizes the conversion of alternating current to direct current through a rectifier circuit.

6. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The DC bus (6) is wrapped with insulating material.

7. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, The converter I (7) and the converter II (8) each include a power switching device, which is an insulated gate bipolar transistor or a metal oxide semiconductor field effect transistor.

8. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, A mechanical locking member (9) for locking and unlocking the flywheel rotor of the energy storage flywheel (1) is further included, and the mechanical locking member (9) is installed on the mechanical rotating shaft connecting the energy storage flywheel (1) with the inner rotor (31) of the electromagnetic coupler (3).

9. The self-starting inertial flywheel apparatus with UPS power supply of claim 1, wherein, A detection module (10) for detecting the voltage amplitude, voltage frequency and harmonic content of the power grid is further included, and the detection module (10) is in communication connection with the converter I (7) and the converter II (8).

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