CN209896880U - Double-stator alternating current-direct current generating motor system applied to energy storage power station - Google Patents
Double-stator alternating current-direct current generating motor system applied to energy storage power station Download PDFInfo
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- CN209896880U CN209896880U CN201920739483.5U CN201920739483U CN209896880U CN 209896880 U CN209896880 U CN 209896880U CN 201920739483 U CN201920739483 U CN 201920739483U CN 209896880 U CN209896880 U CN 209896880U
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Abstract
The utility model discloses a be applied to two stator alternating current-direct current generator motor systems in energy storage power station relates to alternating current-direct current generator system technical field. The utility model comprises a double-stator AC/DC generator motor, a prime mover, an AC double-fed frequency conversion device and an AC/DC frequency conversion device; the double-stator alternating current and direct current generator motor comprises an outer stator, an inner stator and a rotor, wherein an outer stator winding is directly connected with a power grid through a step-up transformer and is directly connected with the power grid side of the alternating current double-fed frequency conversion device through an excitation transformer; the inner stator winding is connected with a direct current power grid through an alternating current-direct current frequency conversion device; the prime mover is mechanically coupled to the rotor. The utility model discloses utilize two stator alternating current-direct current generator motor's adjustable speed ability for the prime mover works in optimum rotational speed district under different external condition and power demand, thereby is showing the operating efficiency who improves whole generator motor system, reduces the abrasion and the harm to the prime mover, improves unit operating characteristic, improves unit reliability and life.
Description
Technical Field
The utility model belongs to the technical field of the alternating current-direct current generator system technique and specifically relates to a be applied to two stator alternating current-direct current generator motor systems in energy storage power station.
Background
With the rapid development of the power industry in China, the proportion of renewable energy power generation is increasing continuously, power electronic devices are increasing in power systems day by day, the load peak-to-valley ratio of the power systems is expanding day by day, and the market reformation of power gradually deepens into the development of an energy internet and an alternating current-direct current hybrid power grid. In order to ensure the stability of the power system, improve the consumption capacity of clean energy, improve the quality of electric energy of the power system, enhance the operation economy of the power system, develop a large-capacity energy storage technology and construct a large-capacity energy storage power station, the method is an effective means. Under the state of the prior art, the energy storage technology which simultaneously meets the technical indexes that the energy storage power exceeds ten megawatts and the energy storage capacity exceeds hundreds megawatts per hour and has commercial operation economy mainly comprises a pumped storage power station, a hydroelectric power station provided with a power generation motor set, a compressed air energy storage power station and an inertia energy storage power station. According to the comprehensive benefit expectation of the geographic environment, the power grid topological structure, the energy storage demand, the electric power market business model and the energy storage power station, the energy storage power station is reasonably planned, constructed and utilized, the power generation permeability of the renewable energy sources can be obviously improved, the stability and the electric energy quality of a power system with a large number of power electronic devices can be improved, and the environment protection and the atmospheric pollution treatment can be promoted by improving the power generation proportion of the renewable energy sources. Meanwhile, the high-capacity energy storage power station can meet the requirements of load peak clipping, valley filling and system frequency modulation and phase modulation, the operation economy of a power system is improved, and the commercial benefits of power enterprises are improved. In addition, for regional comprehensive energy suppliers arising from the market reformation of electric power, especially for industrial regional power suppliers with large power consumption requirements, energy storage power stations are configured in the power supply regions, and the method also has obvious technical and economic benefits.
The common energy storage unit at present is generally a constant speed synchronous unit. Because the energy storage power station has large variation range of operating power, more switching of operating modes and high switching speed of required modes, the optimal operating speed of a prime motor (in a power generation mode) or a load (in an electric mode) is related to the operating condition, and parts of operating condition points may cause serious abrasion and cavitation damage to the prime motor or the load or generate vibration and noise problems. The variable-speed unit can improve the operation efficiency of the unit, improve the operation reliability of the unit and prolong the effective operation time of the unit. In addition, the variable-speed unit can provide more flexible and rapid power regulation, stability control and auxiliary service, and improves the service quality and the operation economy of the energy storage power station.
With the progress of power electronic technology, the rapid development of distributed renewable energy technology, and the rapid increase of direct current loads of electric vehicles and the like, the advantages of the technology of adopting the alternating current-direct current hybrid power grid are more and more prominent. The dc grid supplements the ac grid, and the primary power source includes a converter station connected to the ac grid and a renewable energy power generation device, such as a photovoltaic panel, connected to the dc grid. The renewable energy power generation device and main loads of a direct current power grid such as an electric automobile have high uncertainty and volatility, and the direct current power grid and the alternating current power grid are strongly coupled by the alternating current-direct current converter station, so that the stability problem of the direct current power grid is prominent, and the installation of the direct current power grid energy storage device has great significance for guaranteeing the operation economy and reliability of the power grid. However, the cost of installing a battery energy storage device is prohibitive.
At present, a stator variable-frequency speed regulation unit is generally adopted in an energy storage power station, and mainly comprises a brushless double-fed motor and a full-power variable-frequency synchronous motor. It has the following disadvantages:
the brushless double-fed motor with the multiphase control winding has the advantages of complex structure, low power density and rich harmonic content, and is quite difficult to apply to a large-capacity motor. Although the full-power frequency conversion synchronous motor can realize power modulation by depending on a full-power frequency converter, the capacity of the frequency converter needs to be selected according to the designed overload capacity of the motor, and the full-power frequency conversion synchronous motor is expensive in application in the high-power field and is not mature enough in the prior art. The stator variable frequency speed regulating unit only has one power output port, and cannot simultaneously realize the input/output of decoupled alternating current and direct current power and the control thereof on an upper circuit.
Or the conventional double-fed power generation motor unit of variable frequency excitation of a set of three-phase winding on each stator and rotor only has one power output port, and the decoupled alternating current and direct current power input/output and the control thereof on the upper circuit cannot be realized simultaneously through the same unit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect and not enough that exist among the above-mentioned prior art, the utility model provides a be applied to the energy storage power station, can realize the adjustable speed's of power exchange double stator alternating current-direct current generator motor system with alternating current electric wire netting and direct current electric wire netting simultaneously, the utility model discloses an invention aim at solves not enough among the above-mentioned prior art, the utility model discloses utilize the adjustable speed ability of double stator alternating current-direct current generator motor of this application for the prime mover is worked in optimum rotational speed district under different external condition and power demand, thereby is showing the operating efficiency who improves whole generator motor system, reduces the abrasion and the harm to the prime mover, improves unit operating characteristic, improves unit reliability and life.
In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:
the utility model provides a two stator alternating current-direct current generator motor systems for in energy storage power station which characterized in that: the double-stator AC/DC generator comprises a double-stator AC/DC generator motor, a prime mover, an AC double-fed frequency conversion device and an AC/DC frequency conversion device; the double-stator alternating current and direct current generator motor comprises an outer stator, an inner stator and a rotor, wherein the outer stator comprises an outer stator iron core and an outer stator winding, the outer stator winding adopts a three-phase multi-branch distributed winding, and the outer stator winding is directly connected with a power grid through a step-up transformer and is directly connected with the power grid side of an alternating current double-fed frequency conversion device through an excitation transformer; the inner stator comprises an inner stator iron core and an inner stator winding, the inner stator winding adopts a multi-phase multi-branch distributed winding, and the inner stator winding is connected with a direct-current power grid through an alternating-current and direct-current frequency conversion device; and the prime mover is mechanically connected with the rotor of the double-stator alternating current and direct current generating motor.
The rotor includes outer double-fed rotor, separates magnetic layer and interior permanent magnet rotor, separates the magnetic layer and lies in between outer double-fed rotor and the interior permanent magnet rotor, outer double-fed rotor includes double-fed rotor core and double-fed rotor winding, double-fed rotor winding is through the current collection device of rotor tip and the motor side lug connection who exchanges double-fed frequency conversion device.
The inner permanent magnet rotor is composed of a permanent magnet rotor iron core and permanent magnets, and the permanent magnets are placed on the inner surface of the permanent magnet rotor iron core to form the surface-mounted permanent magnet rotor.
The permanent magnet is made of a rare earth permanent magnet material with high coercive force and high residual magnetism density.
The magnetism isolating layer is made of high-strength non-magnetic materials and used for isolating magnetic fields of the inner rotor and the outer rotor.
The alternating current double-fed frequency conversion device comprises an excitation transformer, a three-phase alternating current, direct current and alternating current multi-level bidirectional converter and a rotor crowbar protection device, wherein the rotor crowbar protection device is connected with a port of a double-fed rotor winding and is used for improving the fault protection capability of the rotor winding and the low-voltage and high-voltage ride-through capability of a generator motor system.
The AC-DC frequency conversion device adopts a high-voltage Integrated Gate Commutated Thyristor (IGCT) as a switching element, and can realize AC-DC conversion and DC-AC conversion power flow.
The outer stator winding comprises 3 phases of 60-degree phase belts, each phase comprises A1 parallel branches, the three-phase distributed winding is formed by grouping the phases and the branches in series-parallel connection, and the number of the parallel branches A1 is a positive integer larger than or equal to 1.
The outer stator winding is designed as a short-pitch winding.
The outer stator winding is designed to be an unconventional winding, namely the quotient of the pole pair number P1 of the outer stator winding and the parallel branch A1 is not a positive integer; the back electromotive force vectors of all branches in the same phase zone are the same.
The inner stator winding comprises M phase belts and 2M phase belts, each phase belt comprises A2 parallel branches, and the multiphase distributed winding is formed by grouping the phase belts and the branches in series-parallel connection, wherein the phase number M is an integer larger than or equal to 3, and the parallel branch number A2 is a positive integer larger than or equal to 1.
The outer stator core is provided with an outer stator slot, the slot type of the outer stator slot is an open slot so as to facilitate the wire embedding of an outer stator winding, and the slot opening of the outer stator slot adopts a magnetic slot wedge to reduce the harmonic wave of air gap flux density teeth.
The inner stator iron core is provided with an inner stator slot, the slot type of the inner stator slot is an open slot so as to facilitate the coil inserting of the inner stator winding, and the slot opening of the inner stator slot adopts a magnetic slot wedge so as to reduce the harmonic wave of air gap flux density teeth.
The system also comprises a unified control system, wherein the unified control system is composed of an upper-layer control center, a double-fed control module, a direct current control module, a prime mover control module, and information acquisition, data processing and protection devices and programs which are matched with the modules. The upper control center realizes unified control on the power flow direction and the power flow of the alternating current and direct current electric ports, the reactive power of the alternating current ports, the quality of the output electric energy of the alternating current and direct current electric ports, the running rotating speed of a rotor, the opening degree of a water gate of the reversible water pump turbine and other electric and mechanical quantities according to the running condition of a generator motor system and the requirements of an alternating current and direct current power grid. And the command of the unified control system is converted and transmitted into the control command of each submodule to complete the control target of the generator motor system. The control targets include steady-state and transient control targets.
The alternating current electrical port refers to a node where the outer stator winding is connected with an alternating current power grid, and the direct current electrical port refers to a node where the inner stator winding is connected with a direct current power grid. The ac electrical port includes 9 operating conditions according to its active and reactive power flow directions: the system comprises a power generation phase advancing unit, a power generation phase delaying unit, a power generation unit power factor, an electric phase advancing unit, an electric phase delaying unit, an electric unit power factor, a phase modulating phase advancing unit, a phase modulating phase delaying unit and a phase modulating unit power factor. The power generation refers to that active power is transmitted from a generator motor system to an alternating current power grid, the electric power refers to that active power is transmitted from the alternating current power grid to the generator motor system, and the phase modulation refers to that no active power is exchanged between the generator motor system and the alternating current power grid; the phase-in means that reactive power is transmitted from an alternating current power grid to a generator motor system, the phase-out means that reactive power is transmitted from the generator motor system to the alternating current power grid, and the unit power factor means that no reactive power exchange exists between the generator motor system and the alternating current power grid. The alternating current electric port can realize active power and reactive power decoupling control by utilizing the double-fed characteristic of the alternating current electric port. The dc electrical port includes three operating conditions: generating, electrically driving and disconnecting, wherein the disconnection means that the generator-motor system does not exchange power with a direct current power grid. The control of the alternating current and direct current electric ports is relatively independent and does not interfere with each other, but the mechanical power operation equation constraint is required to be met. Namely:
wherein, PmFor transmitting mechanical power from prime mover to rotor, P1Means that the AC electrical port delivers power, P, to the AC mains2The direct current electric port transmits power to a direct current power grid, J is rotational inertia, and omega is the rotor electric angular speed.
Furthermore, due to the capability of rapid power response control of the double-fed control mode adopted by the alternating current electric port, the unified control system can realize flexible steady-state and transient power control of the whole generator motor system by comprehensively regulating and controlling and applying the operation conditions and the operation characteristics of the mechanical port, the direct current electric port and the alternating current electric port.
Compared with the prior art, the utility model discloses profitable technological effect who brings shows:
1. the speed-adjustable double-stator generating motor system is adopted in the energy storage power station, and the speed adjusting capability of the system can be utilized, so that the prime motor works in the optimal rotating speed area under different external conditions and power requirements, the operation efficiency of the whole generating motor system is obviously improved, the abrasion and damage to the prime motor are reduced, the operation characteristics of a unit are improved, the reliability of the unit is improved, and the service life of the unit is prolonged.
2. The speed-adjustable double-stator generating motor system is provided with an alternating current electric port and a direct current electric port at the same time, can be connected with an alternating current power grid and a direct current power grid at the same time, and provides high-capacity energy storage service for the alternating current power grid and the direct current power grid, so that the utilization rate and the integration level of energy storage capacity are improved. Meanwhile, the connection of the AC/DC power grid at an energy transfer angle and the decoupling of an electrical angle are realized, so that the safe and reliable interconnection of the AC/DC power grid is ensured, and the mutual influence of faults and disturbance caused by direct electrical connection of the AC/DC power grid is avoided.
3. The speed-adjustable double-stator generating motor system realizes electromechanical energy conversion by utilizing physical energy storage modes such as potential energy, rotational kinetic energy and the like through a mechanical rotating element, and can provide inertial damping for an alternating current and direct current power grid, so that the stability support of the alternating current and direct current power system, particularly the direct current power system, is improved.
4. The speed-adjustable double-stator generating motor system can utilize the cooperative control of energy flow and tide of an alternating current port and a direct current port and the energy cooperation of a large power grid, an energy storage power station and a direct current power grid, so that the generating motor system has more abundant operation condition combinations. The flexibility of a generator-motor system is enhanced, the stability and the robustness of an alternating current-direct current power system are improved, the operation economy of an energy storage power station can be improved, particularly the operation economy under the power market environment, and the consumption capacity of renewable energy power generation is improved.
5. The alternating-current double-fed frequency conversion device for connecting the outer stator winding and the outer double-fed rotor winding can realize the variable-speed operation of the generator motor in a certain slip range through the frequency conversion control system with smaller capacity, thereby reducing the capacity requirement of the frequency conversion control system (the capacity requirement is s)maxP1maxIn which is s, (. phi.)maxMaximum slip of P1maxThe maximum power of the outer stator winding, cos (phi) is the minimum power factor corresponding to the power), so that the existing mature frequency conversion control system manufacturing technology can meet the requirement of a hundred megawatt high-power speed-adjustable generating motor systemTo improve the economy and feasibility of the generator-motor system.
Drawings
Fig. 1 is a schematic block diagram of a speed-adjustable double-stator ac/dc generator-motor system provided by the present invention;
fig. 2 is a schematic diagram of a modular structure of a speed-adjustable double-stator ac/dc generator-motor system according to an embodiment of the present invention;
fig. 3 is a schematic view of an outer stator of a speed-adjustable double-stator ac/dc generator motor according to an embodiment of the present invention;
fig. 4 is a schematic view of a rotor of a variable speed double-stator ac/dc generator motor according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an inner stator of a speed-adjustable double-stator ac/dc generator motor provided by an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a six-phase doubly-fed variable speed generator-motor with a rotor according to an embodiment of the present invention;
reference numerals: 1. double-stator AC/DC power generation motor, 2, AC double-fed frequency conversion device, 3, excitation transformer, 4, rotor winding crowbar protection device, 5, AC/DC frequency conversion device, 6, DC power grid, 7, step-up transformer, 8, AC power grid, 9, prime mover, 10, unified control system, 1-1, outer stator, 1-2, rotor, 1-3, inner stator, 2-1, motor side filter, 2-2, multilevel AC/DC/AC frequency converter, 2-3 power grid side filter, 2-2-1, motor side converter, 2-2-2, multilevel DC bus, 2-2-3, power grid side converter, 1-1-1, outer stator iron core, 1-1-2, outer stator slot, 1-2-1, outer double-fed rotor, 1-2-1-1, an outer double-fed rotor slot, 1-2-1-2, an outer double-fed rotor iron core, 1-2-2, a magnetism isolating layer, 1-2-3, an inner permanent magnet rotor, 1-2-3-1, an inner permanent magnet rotor iron core, 1-2-3-2, a permanent magnet, 1-3-1, an inner stator iron core, 1-3-2, an inner stator slot, 5-1, an alternating current-direct current converter, 5-2 and a direct current bus.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
As a preferred embodiment of the present invention, referring to fig. 1-6 of the specification, the present embodiment provides a speed-adjustable double-stator ac/dc generator motor system for a pumped storage power station. Fig. 1 shows an electrical system schematic block diagram of a speed-adjustable double-stator generator-motor system according to an embodiment of the present invention, which is detailed as follows:
the double-stator alternating current and direct current generating motor system applied to the pumped storage power station comprises a double-stator alternating current and direct current generating motor 1, an alternating current double-fed frequency conversion device 2, an excitation transformer 3, a rotor winding crowbar protection device 4, an alternating current and direct current frequency conversion device 5 and a direct current power grid 6 connected with the alternating current frequency conversion device, a boosting transformer 7 and an alternating current power grid 8 connected with the boosting transformer, a reversible water pump turbine serving as a prime motor 9 and a unified control system 10. The double-stator alternating current and direct current generator motor 1 comprises an outer stator 1-1 consisting of an outer stator iron core 1-1-1 and an outer stator winding, a rotor 1-2 consisting of an outer double-fed rotor 1-2-1, a rotor magnetism isolating layer 1-2-2 and an inner permanent magnet rotor 1-2-3, and an inner stator 1-3 consisting of an inner stator iron core 1-3-1 and an inner stator winding. The alternating current double-fed frequency conversion device 2 consists of a motor side filter 2-1, a multi-level alternating current-direct current-alternating current frequency converter 2-2 and a power grid side filter 2-3. The unified control system 5 comprises modules of communication and information processing, state monitoring and fault protection, joint operation regulation and control, energy management, economic operation control and the like.
The following is described with reference to specific embodiments:
the specific embodiment illustrates a doubly-fed variable speed generator-motor system with a rated power of 3.2MW and a rated power factor of 0.9. The power of the generator-motor system used by the pumped-storage power station may be much larger than that of the generator-motor system stated in the present embodiment, but all of them can be designed based on the principle of the utility model related to the present embodiment.
As shown in fig. 2, a speed-adjustable double-stator ac/dc generator motor system adopts a reversible pump turbine as a prime mover 9, a load and a phase-adjusting rotating element under different working conditions. The double-stator alternating current and direct current generating motor 1 comprises an outer stator 1-1, a rotor 1-2 and an inner stator 1-3. The outer stator winding is directly connected to an ac power supply system 8 via a step-up transformer 7. The rotor 1-2 comprises three parts from the outside to the inside in the radial direction: the outer doubly-fed rotor 1-2-1, the magnetism isolating layer 1-2-2 and the inner permanent magnet rotor 1-2-3 are connected through a mechanical structure. The port of the external double-fed rotor winding is connected with the port of the external stator winding (the low-voltage side of the booster transformer) through the alternating-current double-fed frequency conversion device 2 and the exciting transformer 3. The alternating current double-fed frequency conversion device 2 comprises a motor side filter 2-1, a motor side converter 2-2-1, a multi-level direct current bus 2-2-2, a power grid side converter 2-2-3 and a power grid side filter 2-3. The inner permanent magnet rotor adopts a surface-mounted rotor structure. The inner stator winding is connected with a direct current power grid 6 through an alternating current-direct current frequency conversion device 5. The AC/DC frequency conversion device 5 is composed of an AC/DC converter 5-1 and a DC bus 5-2, wherein the AC/DC converter 5-1 has the capability of voltage transformation and frequency conversion. The reversible water pump turbine, the alternating current double-fed frequency conversion device 2, the rotor crowbar protection device 4 and the alternating current-direct current frequency conversion device 5 are uniformly regulated and controlled by a uniform control system 10.
As shown in fig. 2, an adjustable-speed double-stator ac/dc generator-motor 1 includes an outer stator 1-1, a rotor 1-2, and an inner stator 1-3. Wherein, the outer stator is shown in fig. 3, the rotor is shown in fig. 4, the inner stator is shown in fig. 5, and the motor cross-sectional view is shown in fig. 6.
The outer stator 1-1 shown in fig. 3 is composed of an outer stator core 1-1-1 and outer stator slots 1-1-2. The outer stator core 1-1-1 is made of silicon steel sheet laminations, the outer stator slots 1-1-2 are parallel slots and open slots, so that the outer stator winding is convenient to embed, and the magnetic slot wedges are placed in the slots of the outer stator slots and used for fixing the outer stator winding and reducing the harmonic component of air gap flux density teeth. The outer stator winding is made of formed coils and adopts a double-layer short-distance distributed lap winding structure. The number of the outer stator slots is 108, the outer stator winding is a three-phase 60-degree phase belt distributed lap winding, the number of conductors in each slot is 2, the number of parallel branches is 3, and the short-distance ratio of the outer stator winding is 15/18.
The rotor shown in figure 4 is composed of an outer doubly-fed rotor slot 1-2-1-1, an outer doubly-fed rotor iron core 1-2-1-2, a magnetic isolation layer 1-2-2, an inner permanent magnet rotor iron core 1-2-3-1 and an inner permanent magnet rotor surface-mounted permanent magnet 1-2-3-2. The outer doubly-fed rotor core 1-2-1-2 and the inner permanent magnet rotor core 1-2-3-1 are made of silicon steel sheets through lamination on two sides of a manufactured magnetic isolation layer. The outer doubly-fed rotor slot 1-2-1-1 adopts a parallel slot and open slot structure to facilitate the rotor winding wire embedding, and the magnetic slot wedge is placed in the slot of the outer doubly-fed rotor slot to fix the rotor winding and reduce the harmonic component of air gap flux density teeth. The rotor winding is made of formed coils and adopts a double-layer short-distance distributed lap winding structure. The number of the external doubly-fed rotor slots is 126, the rotor winding is a three-phase 60-degree phase-band distributed lap winding, the number of conductors in each slot is 2, the number of parallel branches is 1, and the pitch ratio of the rotor winding is 18/21. The magnetism isolating layer 1-2-2 is made of high-strength non-magnetic materials and is used as a base of a lamination of the outer doubly-fed rotor core 1-2-1-2 and the inner permanent magnet rotor core 1-2-3-1. The permanent magnets 1-2-3-2 are uniformly fixed on the surface of the inner permanent magnet rotor iron core 1-2-3-1 to form a surface-mounted permanent magnet rotor. The number of the permanent magnet blocks is 24, and the permanent magnets with N poles and S poles are alternately used according to the magnetic pole direction of the permanent magnet facing the inner stator to form a surface-mounted permanent magnet rotor with 12 pairs of poles. The surface-mounted permanent magnet adopts a radial magnetizing mode, but can also adopt a parallel magnetizing mode. The permanent magnets can be fixed on the surface of the inner permanent magnet rotor core in various modes such as bundling, bonding and the like in a mixed mode.
The inner stator 1-3 shown in fig. 5 is composed of an inner stator core 1-3-1 and inner stator slots 1-3-2. The inner stator iron core 1-3-1 is made of silicon steel sheet laminations, and the inner stator slots 1-3-2 are of parallel slot and open slot structures, so that the inner stator winding is convenient to embed. The inner stator winding is made using a formed coil. The number of the inner stator slots is 72, the inner stator winding is a three-phase 60-degree phase belt distributed lap winding, the number of conductors in each slot is 2, the number of parallel branches is 1, and a full-pitch winding is adopted in the example.
The cross section of the motor shown in fig. 6 is composed of an outer stator 1-1, an inner stator 1-2 and a rotor 1-3, and the double-stator alternating current and direct current generator motor is a double-air gap motor.
This embodiment is only the utility model discloses an example, in the energy storage power station of different grade type, according to different design demand and operation demand, the designer will make the requirement of change in order to satisfy corresponding engineering condition to design parameter.
Example 2
As another preferred embodiment of the present invention, referring to fig. 1-6 of the specification, the present embodiment discloses:
the speed-adjustable double-stator alternating current and direct current generator motor system provided by the embodiment comprises a double-stator alternating current and direct current generator motor 1, a prime mover device, an alternating current double-fed frequency conversion device 2, an alternating current and direct current frequency conversion device 5 and a unified control system 10.
The double-stator alternating current and direct current generator motor 1 provided by the embodiment comprises an outer stator 1-1, an inner stator 1-3 and a rotor 1-2. The outer stator 1-1 is composed of an outer stator core 1-1-1 and an outer stator winding, an outer stator slot 1-1-2 is formed in the outer stator core, the slot type of the outer stator slot 1-1-2 is an open slot so as to facilitate wire embedding of the outer stator winding, and a magnetic slot wedge is adopted in a slot opening of the outer stator slot 1-1-2 to reduce air gap flux density tooth harmonic waves. The external stator winding adopts a three-phase multi-branch distributed winding and comprises 3 phases and 6 phase belts, each phase comprises 1 parallel branches, the three-phase distributed winding forms 1 set of three-phase distributed winding by grouping the phases and the branches in series-parallel connection, and the number a1 of the parallel branches is a positive integer greater than or equal to 1. The number of parallel branches a1 is selected based on a combination of electromagnetic load and economy. The three-phase distributed winding can be designed into a short-distance winding or an unconventional winding (the quotient of the number p1 of pole pairs of the outer stator winding and the number a1 of parallel branches is not a positive integer), and if the three-phase distributed winding is designed into the unconventional winding, the back electromotive force vectors of the branches of the same phase band are consistent so as to avoid circulating current. And the outer stator winding is directly connected with a power grid through a step-up transformer and directly connected with the power grid side of the alternating current double-fed frequency conversion device through an exciting transformer.
The inner stator 1-3 is composed of an inner stator iron core 1-3-1 and an inner stator winding, an inner stator slot 1-3-2 is formed in the inner stator iron core 1-3-1, the slot type of the inner stator slot 1-3-2 is an open slot so as to facilitate line embedding of the inner stator winding, and a magnetic slot wedge is adopted in a slot opening of the inner stator slot 1-3-2 to reduce air gap magnetic density tooth harmonics. The inner stator winding adopts a multi-phase multi-branch distributed winding and comprises M phases and 2M phase bands, each phase comprises 2 parallel branches, and the multi-phase distributed winding is formed by grouping the phases and the branches in series-parallel connection. Wherein the number of phases M is an integer greater than or equal to 3, and the number of parallel branches A2 is a positive integer greater than or equal to 1. The number of phases M can be arbitrarily selected within an integer range satisfying the condition, but in order to facilitate the design and manufacture of the winding and the type selection of the ac/dc frequency conversion device, an integer multiple of 3 and 3 should be generally selected. The number of parallel branches A2 is selected based on a combination of electromagnetic load and economy. The inner stator winding is designed as a short-distance winding and is connected with a direct-current power grid through an alternating-current and direct-current frequency conversion device.
The rotor 1-2 is composed of an outer doubly-fed rotor 1-2-1, a magnetism isolating layer 1-2-2 and an inner permanent magnet rotor 1-2-3. The external doubly-fed rotor 1-2-1 is composed of a doubly-fed rotor iron core 1-2-1-2 and a doubly-fed rotor winding. The double-fed rotor comprises a double-fed rotor core 1-2-1-2, and is characterized in that an outer double-fed rotor slot 1-2-1-1 is formed in the double-fed rotor core 1-2-1-2, the slot type of the outer double-fed rotor slot 1-2-1-1 is an open slot so as to facilitate the coil inserting of a rotor winding, and the outer double-fed rotor slot 1-2-1-1 adopts a magnetic slot wedge so as to reduce air gap flux density harmonic waves. The rotor winding adopts a three-phase distributed winding and comprises 3 phases and 6 phase belts, and the number a2 of parallel branches is a positive integer greater than or equal to 1. The rotor winding should be designed as a short-pitch winding. And the rotor winding is directly connected with the motor side of the alternating current double-fed frequency conversion device through a current collecting device at the end part of the rotor.
The inner permanent magnet rotor 1-2-3 is composed of a permanent magnet rotor iron core 1-2-3-1 and permanent magnets 1-2-3-2, and the permanent magnets 1-2-3-2 are placed on the inner surface of the inner permanent magnet rotor iron core 1-2-3-1 to form a surface-mounted permanent magnet rotor. The permanent magnet 1-2-3-2 is made of a rare earth permanent magnet material with high coercive force and high residual magnetism density.
The magnetism isolating layer 1-2-2 is made of high-strength non-magnetic materials and used for isolating the magnetic fields of the inner permanent magnet rotor 1-2-3 and the outer doubly-fed rotor 1-2-1.
The prime motor device comprises a prime motor 9 and a control system thereof, wherein the prime motor 9 is mechanically connected with rotors 1-2 of the double-stator alternating current and direct current generator motor 1, the control system of the prime motor is used as a part of a unified control system 10, and the power and response characteristics of the generator motor system are adjusted by controlling the power characteristics of the prime motor 9. The prime mover 9 has reversible operation capability, i.e. it may be driven as a prime mover to drive the generator motor or as a load from the prime mover. For example, in pumped storage plants the prime mover is a reversible pump turbine, in compressed air storage plants the prime mover is a reversible compression pump, and in flywheel storage plants the prime mover is a flywheel system.
The alternating current double-fed frequency conversion device 2 comprises an exciting transformer 4, a multi-level alternating current-direct current-alternating current frequency converter 2-2 and a rotor crowbar protection device 4, wherein the rotor crowbar protection device 4 is connected with a port of a double-fed rotor winding and is used for improving the fault protection capability of the rotor winding and the low-voltage and high-voltage ride-through capability of a generator motor system.
The alternating current-direct current frequency conversion device 5 provides bidirectional power flow direction capability, namely the alternating current-direct current frequency conversion device adopts a high-voltage Integrated Gate Commutated Thyristor (IGCT) as a switch element, and can realize alternating current-direct current conversion and direct current-alternating current conversion.
The unified control system 10 is composed of an upper control center, a double-fed control module, a direct current control module, a prime mover control module, and devices and programs for information acquisition, data processing, protection and the like which are matched with the modules. The upper control center realizes unified control on the power flow direction and the power flow of the alternating current and direct current electric ports, the reactive power of the alternating current ports, the quality of the output electric energy of the alternating current and direct current electric ports, the running rotating speed of a rotor, the opening degree of a water gate of the reversible water pump turbine and other electric and mechanical quantities according to the running condition of a generator motor system and the requirements of an alternating current and direct current power grid. And the command of the unified control system is converted and transmitted into the control command of each submodule to complete the control target of the generator motor system. The control targets include steady-state and transient control targets.
The alternating current electrical port refers to a node where the outer stator winding is connected with an alternating current power grid, and the direct current electrical port refers to a node where the inner stator winding is connected with a direct current power grid. The ac electrical port includes 9 operating conditions according to its active and reactive power flow directions: the system comprises a power generation phase advancing unit, a power generation phase delaying unit, a power generation unit power factor, an electric phase advancing unit, an electric phase delaying unit, an electric unit power factor, a phase modulating phase advancing unit, a phase modulating phase delaying unit and a phase modulating unit power factor. The power generation refers to that active power is transmitted from a generator motor system to an alternating current power grid, the electric power refers to that active power is transmitted from the alternating current power grid to the generator motor system, and the phase modulation refers to that no active power is exchanged between the generator motor system and the alternating current power grid; the phase-in means that reactive power is transmitted from an alternating current power grid to a generator motor system, the phase-out means that reactive power is transmitted from the generator motor system to the alternating current power grid, and the unit power factor means that no reactive power exchange exists between the generator motor system and the alternating current power grid. The alternating current electric port can realize active power and reactive power decoupling control by utilizing the double-fed characteristic of the alternating current electric port. The dc electrical port includes three operating conditions: generating, electrically driving and disconnecting, wherein the disconnection means that the generator-motor system does not exchange power with a direct current power grid. The control of the alternating current and direct current electric ports is relatively independent and does not interfere with each other, but the mechanical power operation equation constraint is required to be met. Namely:
wherein, PmFor transmitting mechanical power from prime mover to rotor, P1Means that the AC electrical port delivers power, P, to the AC mains2The direct current electric port transmits power to a direct current power grid, J is rotational inertia, and omega is the rotor electric angular speed.
Furthermore, due to the capability of rapid power response control of the double-fed control mode adopted by the alternating current electric port, the unified control system can realize flexible steady-state and transient power control of the whole generator motor system by comprehensively regulating and controlling and applying the operation conditions and the operation characteristics of the mechanical port, the direct current electric port and the alternating current electric port.
Above-mentioned embodiment is only the utility model discloses a partial example of enumerating, in the energy storage power station of different grade type, according to different design demand and operation demand, the designer will make the requirement of change in order to satisfy corresponding engineering condition to design parameter.
Claims (10)
1. Be applied to two stator alternating current-direct current generator motor systems in energy storage power station, its characterized in that: the double-stator alternating current and direct current generator comprises a double-stator alternating current and direct current generator motor (1), a prime motor (9), an alternating current double-fed frequency conversion device (2) and an alternating current and direct current frequency conversion device (5); the double-stator alternating current and direct current generator motor (1) comprises an outer stator (1-1), an inner stator (1-3) and a rotor (1-2), wherein the outer stator (1-1) comprises an outer stator core (1-1-1) and an outer stator winding, the outer stator winding adopts a three-phase multi-branch distributed winding, the outer stator winding is directly connected with an alternating current power grid (8) through a step-up transformer (7), and is directly connected with the power grid side of an alternating current double-fed frequency conversion device (2) through an excitation transformer (3); the inner stator (1-3) comprises an inner stator iron core (1-3-1) and an inner stator winding, the inner stator winding adopts a multi-phase multi-branch distributed winding, and the inner stator winding is connected with a direct current power grid (6) through an alternating current-direct current frequency conversion device (5); the prime motor (9) is mechanically connected with the rotor (1-2) of the double-stator alternating current and direct current generating motor (1).
2. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 1 wherein: the rotor (1-2) comprises an outer double-fed rotor (1-2-1), a magnetism isolating layer (1-2-2) and an inner permanent magnet rotor (1-2-3), the magnetism isolating layer (1-2-2) is located between the outer double-fed rotor (1-2-1) and the inner permanent magnet rotor (1-2-3), the outer double-fed rotor (1-2-1) comprises an outer double-fed rotor iron core (1-2-1-2) and an outer double-fed rotor winding, and the outer double-fed rotor winding is directly connected with the motor side of the alternating current double-fed frequency conversion device (2) through a current collecting device at the end part of the rotor.
3. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 2 wherein: the inner permanent magnet rotor (1-2-3) is composed of an inner permanent magnet rotor iron core (1-2-3-1) and permanent magnets (1-2-3-2), and the permanent magnets (1-2-3-2) are placed on the inner surface of the inner permanent magnet rotor iron core (1-2-3-1) to form a surface-mounted permanent magnet rotor.
4. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 3 wherein: the permanent magnet (1-2-3-2) is made of a rare earth permanent magnet material with high coercive force and high residual magnetism density.
5. A double stator ac/dc generator/motor system for use in an energy storage plant according to any of claims 2 to 4 wherein: the magnetism isolating layer (1-2-2) is made of high-strength non-magnetic materials and used for isolating a magnetic field between the inner permanent magnet rotor (1-2-3) and the outer doubly-fed rotor (1-2-1).
6. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 2 wherein: the alternating current double-fed frequency conversion device (2) comprises an excitation transformer (3), a three-phase alternating current, direct current and alternating current multi-level bidirectional converter and a rotor crowbar protection device (4), wherein the rotor crowbar protection device (4) is connected with a port of the outer double-fed rotor winding and is used for improving the fault protection capability of the rotor winding and the low-voltage and high-voltage ride-through capability of a generator motor system.
7. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 1 wherein: the alternating current-direct current frequency conversion device (5) adopts a high-voltage integrated gate-commutated thyristor as a switching element, and can realize the power flow of alternating current-direct current conversion and direct current-alternating current conversion.
8. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 1 wherein: the outer stator winding comprises 3 phases of 60-degree phase belts, each phase comprises A1 parallel branches, the three-phase distributed winding is formed by grouping the phases and the branches in series-parallel connection, and the number of the parallel branches A1 is a positive integer larger than or equal to 1.
9. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 1 wherein: the inner stator winding comprises M phase belts and 2M phase belts, each phase belt comprises A2 parallel branches, and the multiphase distributed winding is formed by grouping the phase belts and the branches in series-parallel connection, wherein the phase number M is an integer larger than or equal to 3, and the parallel branch number A2 is a positive integer larger than or equal to 1.
10. A dual stator ac/dc generator motor system for use in an energy storage power station as claimed in claim 1 wherein: an outer stator slot (1-1-2) is formed in the outer stator core (1-1-1), the slot shape of the outer stator slot (1-1-2) is an open slot so as to facilitate wire embedding of an outer stator winding, and a magnetic slot wedge is adopted in the slot opening of the outer stator slot (1-1-2); the inner stator iron core (1-3-1) is provided with an inner stator groove (1-3-2), the groove shape of the inner stator groove (1-3-2) is an open groove so as to facilitate the coil inserting of the inner stator winding, and the notch of the inner stator groove (1-3-2) adopts a magnetic groove wedge.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138163A (en) * | 2019-05-22 | 2019-08-16 | 湖北研道特磁科技有限公司 | A kind of bimorph transducer alternating current-direct current power generation motor system applied in energy-accumulating power station |
| CN117081098A (en) * | 2023-07-20 | 2023-11-17 | 华中科技大学 | High-inertia high-power rapid frequency/voltage stabilizing device for new energy power system |
| CN110138163B (en) * | 2019-05-22 | 2024-11-08 | 武汉研道科技有限公司 | Double-stator alternating current-direct current power generation motor system applied to energy storage power station |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138163A (en) * | 2019-05-22 | 2019-08-16 | 湖北研道特磁科技有限公司 | A kind of bimorph transducer alternating current-direct current power generation motor system applied in energy-accumulating power station |
| CN110138163B (en) * | 2019-05-22 | 2024-11-08 | 武汉研道科技有限公司 | Double-stator alternating current-direct current power generation motor system applied to energy storage power station |
| CN117081098A (en) * | 2023-07-20 | 2023-11-17 | 华中科技大学 | High-inertia high-power rapid frequency/voltage stabilizing device for new energy power system |
| CN117081098B (en) * | 2023-07-20 | 2024-04-19 | 华中科技大学 | High-inertia high-power rapid frequency/voltage stabilizing device for new energy power system |
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