CN201869080U - Flywheel energy storage motor device with changeable power supply structure - Google Patents

Abstract

A flywheel energy storage motor device with a changeable power supply structure mainly solves the technical problems that the reliability of the device is low and the cost of the device is high. The motor device adopts the technical scheme that a group of independent Y windings are adopted as a stator winding of a motor; one Y winding is reversible and the rest Y windings are respectively a first generating winding and a second generating winding; the reversible winding is connected with a variable-frequency driving unit or a first three-phase rectifier by a bidirectional switch; and the first generating winding and the second generating winding are respectively and correspondingly connected with a second three-phase rectifier and a third three-phase rectifier. When the motor device drives, a power supply is communicated with the reversible winding by the variable-frequency driving unit and the bidirectional switch, and the motor drives a flywheel to rotate so as to store energy; and when generating electricity, the flywheel releases energy, and the Y windings run simultaneously to generate electricity and generate instant high-power output through rectification and inversion. The technical scheme of the flywheel energy storage motor device is applicable to various motor devices adopting a flywheel to store energy.

Description

Power supply structure variable flywheel energy storage motor device

Technical field:

The utility model relates to a system for storing electric energy, in particular to an engine using a flywheel.

Background technique:

Flywheel energy storage motor/generator device is used in occasions requiring instantaneous high-power load power supply, such as peak load regulation of land power grid, energy recovery and reuse of large gantry cranes, energy recovery and reuse of subway stations, etc., the motor/generator The device has a motor/generator with a three-phase winding structure. The shaft end of the three-phase winding motor/generator is connected to a flywheel assembly that can store energy. The three-phase winding is also connected to a three-phase fully-controlled rectifier through a bidirectional switch. The three-phase The fully-controlled rectifier is connected to the load through the three-phase inverter to form a flywheel energy storage motor/generator device. Although the above-mentioned three-phase winding structure motor has a simple structure, its reliability is low. For example, if one of the three-phase windings fails , the whole device will not be able to operate. This phenomenon may lead to serious consequences in some emergency load occasions. The rectifier devices in the device all use high-power thyristors (IGBTs). In the high-power field, the price of power devices is the same as There is an exponential relationship between the capacities. As the required capacity of a single tube increases, its price rises sharply and its reliability decreases. These large-capacity power devices, fully-controlled IGBT devices are very expensive, and are generally uncontrolled with the same capacity. More than 3 times the price of power diodes.

Utility model content:

The technical problem to be solved by the utility model is to provide an improved power supply structure variable flywheel energy storage motor device, which can improve the reliability of the flywheel energy storage motor device and reduce the cost of the entire power conversion system.

The technical solution adopted by the utility model to solve the problems of the technologies described above is:

The power supply structure variable flywheel energy storage motor device includes a motor/generator with a flywheel, a bidirectional switch, a variable frequency drive unit, a three-phase rectifier and a three-phase inverter, and its characteristics are: the stator winding of the motor/generator is a A set of mutually independent Y windings, the stator winding has a Y winding as a reversible winding, and the remaining Y windings of the stator winding are the first and second power generation windings, and the reversible windings are respectively connected to the first variable frequency drive unit through a bidirectional switch A three-phase inverter or a first three-phase rectifier, the first and second power generation windings are respectively connected to the second and third three-phase rectifiers, and the power supply in the motoring state passes through the fourth three-phase rectifier and the first three-phase rectifier of the variable frequency drive unit The three-phase inverter and the two-way switch are connected to the reversible winding, the motor drives the flywheel to rotate at high speed to store energy, the flywheel releases energy in the power generation state, and each Y winding of the stator winding simultaneously performs power generation operation, and through each independent first, second and second The three rectifiers and the second three-phase inverter provide instantaneous high-power output to form a variable power supply structure device.

The motor/generator stator windings of the utility model are Y windings independent of each other. If a certain phase winding fails, the whole device can still operate with derating, which obviously improves the reliability of the device. Winding work, multi-phase motor runs as a three-phase motor, its total power capacity is greatly reduced, and the capacity of each component of the variable frequency drive unit is reduced, which can reduce equipment costs. The stator windings of the motor are all independent Y windings, and the rectification devices connected to it are used Compared with the traditional structure, the overall price of the power diode will be greatly reduced, which has excellent economic benefits.

Description of drawings:

Fig. 1 is a schematic diagram of a variable flywheel energy storage motor device with a power supply structure of the present invention.

Fig. 2 is a schematic diagram of the three-phase rectifier circuit in Fig. 1 .

Fig. 3 is a schematic diagram of the three-phase inverter circuit in Fig. 1 .

Detailed ways:

Referring to Figure 1, the power supply structure variable flywheel energy storage motor device includes a motor/generator stator winding 1, a bidirectional switch 2, a variable frequency drive unit 3, a three-phase rectifier 4, a smoothing capacitor 5 and a three-phase inverter 6 .

The stator winding 1 of the motor/generator is composed of a group (n) of mutually independent Y windings, wherein a set of Y windings is a reversible winding 11, and the reversible winding 11 is connected with a bidirectional switch 2, and the rest (namely n-1 Set of Y windings) is a power generation winding, as shown in Figure 1, the first power generation winding 12, the second power generation winding 13..., wherein the first power generation winding 12 is connected with a second three-phase rectifier 42, and the second power generation winding 13 is connected with For the third three-phase rectifier 43, when n>3, the connection between each generating winding and the three-phase rectifier can be analogized in sequence;

In addition to the above-mentioned structural features, the motor/generator is basically similar to the structure of the prior art. A flywheel assembly is installed on the shaft extension of the rotor. When the motor/generator is in the electric working state, the rotor drives the flywheel to rotate at a high speed, and the flywheel will A large number of functions are stored for instantaneous high power output.

Two-way switch 2, its structure and function are similar to the prior art, one end of the two-way switch 2 is connected to the reversible winding 11 of the stator winding 1, and the other end is connected to the variable frequency drive unit 3 (electric running state). Figure 1 shows A position or three-phase rectifier The first three-phase rectifier 41 of 4 shows the B position (power generation running state) in FIG. 1 .

The structure of the variable frequency drive unit 3 is basically similar to the prior art, including the first three-phase inverter 61 of the fourth three-phase rectifier 44 of the three-phase rectifier 4, the first smoothing capacitor 51 and the three-phase inverter 6; The fourth three-phase rectifier 44 is an uncontrolled rectification rectifier. As shown in FIG. The price is only 1/3 of the same capacity full-control device IGBT, therefore, the technical measures adopted in the utility model can greatly reduce the device cost; the first smoothing capacitor 51 of a smoothing capacitor 5 is connected in parallel to the output of the fourth three-phase rectifier 44 end, the output end is connected with a first three-phase inverter 61 of a three-phase inverter 6; the schematic circuit diagram of the first three-phase inverter 61 is shown in Figure 3, which adopts the classic two-point flat IGBT full control When the capacity of the bridge is large or the requirements for harmonics are relatively strict, a three-level structure can be used. Since the motor/generator is in the motoring state, only the reversible winding 11 works, and the other n-1 sets of windings are unloaded, and the multi-phase motor Running as a three-phase motor, its total power is reduced to 1/n of the total capacity, and the corresponding IGBT capacity of the first three-phase inverter 61 only needs 1/n of the traditional structure, thus further reducing the device cost.

The three-phase rectifier 4, as shown in Figures 1 and 2, includes first, second, third and fourth three-phase rectifiers 41, 42, 43, 44, and the structure and function of each three-phase rectifier are the same as those of the above-mentioned fourth three-phase rectifier. The three-phase rectifier 44 is the same or similar; wherein the input end of the first three-phase rectifier 41 is connected to one end of the bidirectional switch 2, and when the end is closed, the first three-phase rectifier 41 is connected to the reversible winding 11 of the stator winding 1, and the motor/ The generator is in the power generation running state, the output terminal of the first three-phase rectifier 41 is connected to the output bus of the device; the second three-phase rectifier 42, its input terminal is connected to the first power generation winding of the stator winding 1, and its output terminal is connected to the device output bus connection; the third three-phase rectifier 43, its input terminal is connected to the second generator winding of the stator winding 1, and its output terminal is connected to the device output bus; when the stator winding 1 is composed of n mutually independent Y windings, that is There are n-1 generator windings connected to corresponding three-phase rectifiers.

The smoothing capacitor 5, as shown in Figure 1, includes a first smoothing capacitor 51 and a second smoothing capacitor 52, its structure and function are the same or similar to those of the prior art, and the first smoothing capacitor 51 is connected in parallel with the fourth rectifier The output terminal of 44 is used to input the first three-phase inverter 61 of the three-phase inverter 6 after the direct current filtering of the fourth rectifier 44, and the second smoothing capacitor 52 is connected in parallel to the input of the second three-phase inverter 62 end, used to connect the DC of the rectifier of each winding of the stator winding 1 to the second three-phase inverter 62 of the three-phase inverter 6 after filtering.

The three-phase inverter 6, as shown in Figures 1 and 3, includes a first three-phase inverter 61 and a second three-phase inverter 62, both of which are identical or similar in structure and function, and the first three-phase inverter The input end of the inverter 61 is connected to the fourth three-phase rectifier 44, the output end is connected to the bidirectional switch 2, the input end of the second three-phase inverter 62 is connected to the device output bus, and the output end is connected to the load.

When the power supply structure variable flywheel energy storage motor device is running:

Motoring state—the power of the power supply network is converted into direct current by the fourth three-phase rectifier 44 of the variable frequency drive unit 3, filtered by the first smoothing capacitor 51 of the smoothing capacitor 5, and then passed by the first three-phase of the three-phase inverter 6 The inverter 61 converts the alternating current with variable frequency, and supplies power to the reversible winding 11 of the stator winding 1 of the motor/generator. The motor rotates at a high speed and drives the flywheel on its rotor shaft to rotate at a high speed. The flywheel can store a large amount of kinetic energy for instantaneous High power output required.

Power generation state - the electric/engine rotates at high speed driven by the flywheel, the bidirectional switch 2 connects the reversible winding 11 and the first three-phase rectifier 41, and the variable-frequency alternating current generated by all (n sets) of Y windings passes through the corresponding three-phase rectifiers (such as the first, second, third... nth three-phase rectifier) are output to the same DC bus, filtered by the second smoothing capacitor 52 of the smoothing capacitor 5, and then passed through the second and third of the three-phase inverter 6 The phase inverter 62 converts it into high-power AC power output.

Claims (3)

1. A power supply structure variable flywheel energy storage motor device, including a motor/generator with a flywheel, a bidirectional switch, a variable frequency drive unit, a three-phase rectifier and a three-phase inverter, characterized in that: the motor/generator The stator winding (1) is a group of mutually independent Y windings, the stator winding (1) has a Y winding as a reversible winding (11), and the remaining Y windings of the stator winding (1) are for the first and second power generation Windings (12, 12'), the reversible winding (11) is respectively connected to the three-phase inverter (61) or the first three-phase rectifier (41) of the variable frequency drive unit (3) through the bidirectional switch (2), the second 1. The second power generation winding (12, 12') is respectively connected to the first and third three-phase rectifiers (42, 43), and the electric state power supply is passed through the fourth three-phase rectifier (44) of the variable frequency drive unit (3) and The first three-phase inverter (61) and the bidirectional switch (2) connect the reversible winding (11), the motor drives the flywheel to rotate at high speed to store energy, the flywheel releases energy in the power generation state, and the Y windings of the stator winding (1) simultaneously generate electricity operation, and through the independent first, second and third rectifiers (41, 42, 43) and the second three-phase inverter (62) for instantaneous high-power output, forming a variable power supply structure device. 2. The power supply structure variable flywheel energy storage motor device according to claim 1, characterized in that the first, second, third and fourth rectifiers (41, 42, 43, 44) are uncontrolled rectifier rectifiers, Each rectifying device is a power diode. 3. The power supply structure variable flywheel energy storage motor device according to claim 1, characterized in that the first and second inverters (61, 62) are two-level thyristor full-controlled bridges or three-level structures .

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