Distributed vertical inertia phase modifier system

Abstract

The utility model provides a distributed vertical inertia phase modifier system which comprises an inertia phase modifier body, the inertia phase modifier body comprises a synchronous phase modifier, a gear speed increaser and an inertia flywheel which are vertically arranged, the synchronous phase modifier comprises a first stator and a first rotor, and the inertia flywheel comprises a second rotor; a rotor shaft of the first rotor and a rotor shaft of the second rotor are in transmission connection through a gear speed increaser, and the central axes of the two rotors coincide; the inertia phase modifier body is in switching connection with the electrical primary system and the starting system through the change-over switch, and the electrical primary system and the starting system are connected to a power grid in parallel. And the inertia phase modifier body is also connected with an excitation system and an auxiliary system for keeping safe and reliable operation of the inertia phase modifier body.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric power, specifically relates to a kind of distributed vertical inertia phase modifier system, it can provide mechanical inertia and reactive power regulation function for new power system. BACKGROUND

[0002] With the expansion of China's power grid scale and the development of new power system, new energy mainly of wind power and photovoltaic power generation is increasing in the proportion of power system, and gradually becomes main power supply. China's new energy installation is unevenly distributed, and the western region is rich in wind and light resources. A number of large-scale new energy bases are planned and constructed, while the southeast region is economically developed, and the load center is concentrated. Therefore, cross-regional power transmission is realized by constructing large-capacity, long-distance ultra-high voltage AC and DC transmission lines. Compared with the traditional power system with thermal power as the main power supply, the main problems faced by the new power system are:

[0003] (1) The traditional generator set is connected to the grid through a synchronous generator, which can provide sufficient mechanical inertia for the grid, effectively suppress the active power imbalance and maintain the stability of the grid frequency. The new power system mainly uses wind, light and other new energy as the main power supply, which is connected to the grid through power electronic converter, and the power supply and the grid are decoupled, basically without mechanical inertia. Therefore, the higher the proportion of new energy, the lower the inertia of the power system, and the worse the frequency stability.

[0004] (2) The cross-regional transmission through the ultra-high voltage DC grid isolates the inertia of the sending end and the receiving end of the grid. The receiving end is located in the load center, and the synchronous power supply is reduced, so the input DC power does not provide dynamic reactive power, resulting in insufficient reactive power and aggravating the stability problem of system voltage. The output end is close to the new energy base, and the grid is relatively weak, with prominent short-circuit capacity shortage problem.

[0005] Synchronous phase modifier is widely used to provide reactive power for power system and improve system voltage stability. However, the inertia constant of synchronous phase modifier is small, and it does not have inertia support capacity. In addition, the traditional synchronous phase modifier has large single machine capacity, which is usually arranged at the key node of the grid. Due to the distributed characteristics of new energy station, it is suitable to configure small-capacity distributed phase modifier with certain inertia support, which increases the flexibility of configuration.

[0006] Therefore, in order to solve the above problems and promote the development of new power system, the power grid needs to be equipped with small-capacity distributed inertia phase modifier device to make up for the loss of mechanical inertia and provide reactive power regulation capacity, maintain the frequency and voltage stability of the grid, and ensure the safe and reliable operation of the power system. CONTENT OF UTILITY MODEL

[0007] In view of the above technical problems in the related art, the utility model provides a kind of distributed vertical inertia phase modifier system, which can overcome the above-mentioned deficiencies in the prior art.

[0008] To achieve the above technical purpose, the technical scheme of the utility model is as follows:

[0009] A kind of distributed vertical inertia phase modifier system, including inertia phase modifier body, the inertia phase modifier body includes vertically arranged synchronous phase modifier, gear speed increaser and inertia flywheel, synchronous phase modifier includes first stator and first rotor, inertia flywheel includes second rotor;Rotor shaft of first rotor, rotor shaft of second rotor are connected by gear speed increaser and the axis of both coincide;The inertia phase modifier body is switched on respectively with electrical primary system, starting system and is switched connection, electrical primary system and starting system are connected in parallel on power grid.

[0010] Preferably, the inertia phase modifier body is also connected with excitation system and auxiliary system for keeping its safe and reliable operation.

[0011] Preferably, the auxiliary system includes cooling system, vacuum system and monitoring protection system.

[0012] The cooling system is connected or communicated with synchronous phase modifier, gear speed increaser and inertia flywheel through cooling pipeline respectively, so as to cool synchronous phase modifier, gear speed increaser and inertia flywheel.

[0013] The vacuum system is connected or communicated with the inertia flywheel through suction pipeline, so as to ensure the vacuum degree of the inertia flywheel.

[0014] Preferably, the monitoring protection system is connected with at least one more sensor, and the sensor is arranged on the inertia phase modifier body, so as to monitor the key mechanical parameters and electrical parameters of different parts of the inertia phase modifier body, realize fault early warning, alarm and other functions.

[0015] When implemented, the inertia phase modifier body can be installed in a well, to ensure the safety of operation. The inertia phase modifier body can be connected with power grid through electrical primary system, realize starting from static state to working speed through starting system, realize reactive power control through excitation system, provide high mechanical inertia through rotor system on the inertia phase modifier body, and keep the inertia phase modifier body safe and reliable operation under specified conditions through auxiliary system.

[0016] Preferably, the synchronous phase modifier, gear speed increaser and inertia flywheel are positioned and connected by end flange and bolt, and the central axes of the synchronous phase modifier, gear speed increaser and inertia flywheel coincide.

[0017] Preferably, the excitation system is brushless excitation system, and includes AC excitation loop and main excitation loop.

[0018] Preferably, the first rotor is a non-salient pole rotor. The brushless excitation system, the AC excitation circuit and the main excitation circuit can be implemented by using the prior art.

[0019] Preferably, the AC excitation circuit comprises a series connection of an excitation transformer, a power rectifier, a de-excitation switch and an excitation winding.

[0020] Preferably, the input end of the excitation transformer is connected to a machine end to obtain power supply, the output end of the excitation transformer is connected to one end of the power rectifier, the other end of the power rectifier is connected to one end of the de-excitation switch, the other end of the de-excitation switch is connected to the excitation winding, and the excitation winding is arranged on the first stator.

[0021] Preferably, the power rectifier is further connected to an excitation regulating device.

[0022] Preferably, the de-excitation switch is further connected to an excitation starting device. The AC excitation circuit and the excitation regulating device can be connected to a main power supply line to obtain power supply, and the input end of the excitation transformer can be connected to the machine end through the main power supply line to obtain power supply for the AC excitation circuit. The electrical connection of the entire AC excitation circuit can be static and fixed.

[0023] Preferably, the first rotor is a non-salient pole rotor, and the main excitation circuit is arranged on the first rotor.

[0024] Preferably, the main excitation circuit comprises an AC excitation machine armature, a rotating rectifier and a main excitation winding, which can rotate at a synchronous speed, and the AC excitation machine armature, the rotating rectifier and the main excitation winding are relatively static and fixedly connected in an electrical manner.

[0025] Preferably, the inertial flywheel further comprises an outer shell.

[0026] Preferably, the second rotor is in a cylindrical shape.

[0027] Preferably, the support bearing of the second rotor is a combination of a magnetic bearing and a mechanical bearing.

[0028] Preferably, the upper and lower ends of the second rotor are respectively provided with radial bearings for bearing radial loads generated during operation of the rotor.

[0029] Preferably, the inner part of the upper end cover or the lower end cover of the outer shell is provided with an axial bearing for bearing axial loads, i.e. the gravity of the second rotor.

[0030] Preferably, the radial bearing and the axial bearing are cooled by the cooling system.

[0031] Preferably, the upper and lower rotor shaft ends of the second rotor are provided with sealing devices between the shaft holes of the upper and lower end covers and between the upper and lower end covers and the housing, and a vacuum system is used to form a vacuum sealed space between the housing and the second rotor, thereby reducing air friction during operation of the rotor of the inertial flywheel.

[0032] Preferably, the rotational speed of the first rotor is denoted as n sc， The moment of inertia of the second rotor is denoted as J if , and the moment of inertia J if1 on the rotor of the synchronous condenser is calculated as follows:

[0033] ;

[0034] In formula one: the rotational speed of the second rotor is n if =i×n sc , and the unit is revolutions per minute; i is the transmission ratio of the gear speed increaser, that is, the ratio of the rotational speed of the output shaft to the rotational speed of the input shaft of the gear speed increaser.

[0035] Preferably, the rated capacity range of the synchronous condenser is in the MVA level.

[0036] Preferably, the excitation mode of the synchronous condenser is brushless excitation.

[0037] Preferably, the synchronous condenser uses a static frequency converter (SFC) starting mode, and a switching switch is used to switch between the electrical primary system and the starting system; when starting, the switching switch is automatically switched to the circuit connected to the starting system; the static frequency converter (SFC) includes two sets of three-phase bridge thyristors, one of which is used for rectification and the other of which is used for inversion; the conduction angle of the three-phase bridge thyristors is adjusted by a frequency converter control device to gradually increase the rotational speed of the synchronous condenser from a static state to a synchronous speed, and then the switching switch is switched to the circuit of the electrical primary system to enter the operating condition.

[0038] Preferably, the gear speed increaser preferably uses an NGW single-machine planetary gear transmission mechanism, thereby achieving speed increase and keeping the input shaft and the output shaft coaxial, and the ratio i (speed increase ratio) of the rotational speed of the output shaft to the rotational speed of the input shaft is designed and determined according to the mechanical inertia index.

[0039] Preferably, the gear speed increaser is fixed, the planetary wheel arm is the input shaft, is connected to the rotor shaft of the synchronous condenser through a shaft coupling, and the sun gear shaft is the output shaft, which is connected to the input shaft of the inertial flywheel through a shaft coupling, thereby achieving speed increase of the rotor of the inertial flywheel.

[0040] Preferably, the gear speed increaser is lubricated by an oil lubrication system.

[0041] Preferably, the power grid is a high voltage bus providing three-phase alternating current.

[0042] Preferably, the first stator is connected to the high voltage bus via a step-up transformer, so that a synchronous rotating electromagnetic field is formed in the first stator.

[0043] Preferably, the second rotor is made of high-strength metal material.

[0044] The utility model discloses a beneficial effect: the utility model discloses according to the dynamic response synchronous condenser technical requirement of national standard GB / T 44625-2024, carries out the whole system configuration, forms the complete distributed inertia synchronous condenser system, is arranged at the key node of power grid, provides the inertia support and reactive power regulation of power grid, can according to the inertia constant and reactive power regulation capacity demand of specific node, adopts modularization mode and arranges multiple units in array, commonly undertakes inertia support and reactive power regulation function, can increase the flexibility of system arrangement.

[0045] The utility model discloses a inertia synchronous condenser body adopts vertical arrangement structure, specifically includes vertical arrangement's synchronous condenser, gear speed increaser and inertia flywheel, has the characteristics of small floor area, can install the whole inertia synchronous condenser body in the well, guarantees the safety of operation process.

[0046] The utility model discloses under the operation condition, and the synchronous condenser can pass through the excitation current and voltage of excitation system 2 of adjusting, or from the power grid and absorb the reactive current of superposition, or send the reactive current of lag to the power grid, thereby the power factor of power grid is improved. Since synchronous condenser is directly connected to the grid, the rotor of synchronous condenser can provide effective inertia support for the power grid.

[0047] Compared with the prior art, the utility model has the following advantages:

[0048] (A) has inertia and the composite function of regulating phase: can provide inertia support and reactive power regulation function simultaneously.

[0049] (B) Small footprint: the inertia phase modifier body adopts a vertical arrangement mode, has a small footprint, and is easy to realize miniaturization and distributed arrangement of the phase modifier; the axes of the synchronous phase modifier rotor and the inertia flywheel rotor overlap, thereby reducing construction cost. The distributed small-capacity system is suitable for flexible arrangement at a distributed node of a power grid. The inertia phase modifier body can be extended through modularization to form a phase modifier array of different capacities, centralized control, capacity configuration flexibility, and adaptation to different application occasions.

[0050] (C) Flexible capacity configuration: multiple bodies are combined to form an array module, extended to a system of different capacities, and centralized control, so that the inertia and reactive power regulation resources can be optimally configured according to the demand of the power grid.

[0051] (D) High inertia density and energy density: a planetary gear speed increaser is adopted to obtain a large speed-up ratio under a small volume and mass, thereby having a large inertia constant and energy, realizing miniaturization and light weight of the body, reducing energy consumption, and improving efficiency. The speed-up gear box is a planetary gear box, so that the axes of the phase modifier rotor and the inertia flywheel rotor are the same, the structure is compact, and the unit mass and volume have high inertia and high energy.

[0052] (E) Low equipment operation and maintenance cost: the synchronous phase modifier adopts a brushless excitation system to reduce operation and maintenance difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0054] Figure 1 is a structural schematic view of the distributed vertical inertia phase modifier system. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0056] As shown in Figure 1 In order to facilitate the understanding of the above technical solutions of the present application, the above technical solutions of the present application will be described in detail below through specific use modes.

[0057] A distributed vertical inertial phase modifier system, comprising an inertial phase modifier body 1, the inertial phase modifier body 1 comprising vertically arranged synchronous phase modifier 11, gear speed increaser 12 and inertia flywheel 13, the synchronous phase modifier 11 comprising a first stator and a first rotor, the inertia flywheel 13 comprising a second rotor; the rotor shaft of the first rotor and the rotor shaft of the second rotor are drivingly connected through the gear speed increaser 12 and the axes of the two coincide; the inertial phase modifier body 1 is connected to the electrical primary system 3 and the starting system 4 through the switching switch 5, and the electrical primary system 3 and the starting system 4 are connected in parallel to the power grid.

[0058] In one embodiment, the inertial phase modifier body 1 is further connected to the excitation system 2 and the auxiliary system 6 for safe and reliable operation.

[0059] In one embodiment, the auxiliary system 6 comprises a cooling system 61, a vacuum system 62 and a monitoring and protection system 63.

[0060] The cooling system 61 is connected or communicated with the synchronous phase modifier 11, the gear speed increaser 12 and the inertia flywheel 13 through cooling pipelines, so as to cool the synchronous phase modifier 11, the gear speed increaser 12 and the inertia flywheel 13.

[0061] The vacuum system 62 is connected or communicated with the inertia flywheel 13 through a vacuum pipeline, so as to ensure the vacuum degree of the inertia flywheel 13.

[0062] The monitoring and protection system 63 is connected with at least one sensor, and the sensor is arranged on the inertial phase modifier body 1, so as to monitor the key mechanical parameters and electrical parameters of different parts of the inertial phase modifier body 1, and realize the functions of fault early warning and alarm.

[0063] In implementation, the inertial phase modifier body 1 can be installed in a well to ensure the safety during operation. The inertial phase modifier body 1 can be connected to the power grid through the electrical primary system 3, start from the static state to the working speed through the starting system 4, realize the control of reactive power through the excitation system 2, provide high mechanical inertia through the rotor system on the inertial phase modifier body 1, and keep the inertial phase modifier body 1 safe and reliable under the specified conditions through the auxiliary system 6.

[0064] In one embodiment, the synchronous phase modifier 11, the gear speed increaser 12 and the inertia flywheel 13 are positioned and connected through end flanges and bolts, and the axes of the synchronous phase modifier 11, the gear speed increaser 12 and the inertia flywheel 13 coincide.

[0065] In one embodiment, the excitation system 2 is a brushless excitation system, and comprises an AC excitation loop and a main excitation loop 27.

[0066] In one embodiment, the first rotor is a non-salient pole rotor. The brushless excitation system, the AC excitation circuit, and the main excitation circuit 27 can be implemented using existing technology.

[0067] In one embodiment, the AC excitation circuit includes a series connection of an excitation transformer 21, a power rectifier 22, a de-excitation switch 23, and an excitation winding 26.

[0068] In one embodiment, the excitation transformer 21 is connected to a machine terminal to obtain power supply, the excitation transformer 21 is connected to one end of the power rectifier 22, the other end of the power rectifier 22 is connected to one end of the de-excitation switch 23, the other end of the de-excitation switch 23 is connected to the excitation winding 26, and the excitation winding 26 is arranged on the first stator, thereby forming the AC excitation circuit.

[0069] In one embodiment, the power rectifier 22 is further connected to an excitation regulating device 25.

[0070] In one embodiment, the de-excitation switch 23 is further connected to an excitation starting device 24. The AC excitation circuit and the excitation regulating device 25 can be connected to a main power supply line to obtain power supply, and the input end of the excitation transformer 21 can be connected to the machine terminal through the main power supply line to obtain power supply for the AC excitation circuit. The electrical connection of the entire AC excitation circuit can be static and fixed.

[0071] In one embodiment, the first rotor is a non-salient pole rotor, and the main excitation circuit 27 is arranged on the first rotor.

[0072] In one embodiment, the main excitation circuit 27 includes an AC excitation machine armature, a rotating rectifier, and a main excitation winding, which can rotate at a synchronous speed, and the AC excitation machine armature, the rotating rectifier, and the main excitation winding are relatively static and electrically fixed.

[0073] In one embodiment, the inertial flywheel 13 further includes a housing.

[0074] In one embodiment, the second rotor is in a cylindrical shape.

[0075] In one embodiment, the support bearing of the second rotor is a combination of a magnetic bearing and a mechanical bearing.

[0076] In one embodiment, the upper and lower ends of the second rotor are respectively provided with radial bearings for bearing the radial load generated during operation of the rotor.

[0077] In one embodiment, the upper or lower end cover of the housing is internally provided with an axial bearing for bearing axial load, i.e. the gravity of the second rotor.

[0078] In one embodiment, the radial bearing and axial bearing part are cooled by the cooling system 61.

[0079] In one embodiment, the upper and lower rotor shaft ends of the second rotor are provided with sealing devices between the shaft holes of the upper and lower end covers and the housing, and a vacuum system 62 is used to form a vacuum sealed space environment between the housing and the second rotor, thereby reducing air friction during the operation of the rotor of the inertial flywheel 13.

[0080] In one embodiment, the rotational speed of the first rotor is denoted as n sc， The moment of inertia of the second rotor is denoted as J if The moment of inertia J if1 of the rotor of the synchronous condenser 11 is calculated as follows:

[0081] ;

[0082] In formula one: the rotational speed of the second rotor is n if =i×n sc , unit: revolutions per minute; i is the transmission ratio of the gear speed increaser, i.e. the ratio of the output shaft speed to the input shaft speed of the gear speed increaser.

[0083] In one embodiment, the rated capacity range of the synchronous condenser 11 is in the MVA level.

[0084] In one embodiment, the excitation mode of the synchronous condenser 11 is brushless excitation.

[0085] In one embodiment, the synchronous condenser 11 uses a static frequency converter (SFC) starting mode, and a switching switch 5 is used to switch between the electrical primary system 3 and the starting system 4; when starting, the switching switch 5 is automatically switched to the circuit connected to the starting system 4; the static frequency converter (SFC) includes two sets of three-phase bridge thyristors, one of which is used for rectification and the other for inversion; by adjusting the conduction angle of the three-phase bridge thyristors through the frequency converter control device, the rotational speed of the synchronous condenser 11 is gradually increased from zero to synchronous speed, and then the switching switch 5 is switched to the circuit of the electrical primary system 3 to enter the operating condition.

[0086] In one embodiment, the gear speed increaser 12 preferably adopts a NGW single machine planetary gear transmission mechanism, so as to realize speed increase and keep the input shaft and the output shaft coaxial, and the ratio i of the output shaft rotation speed to the input shaft rotation speed (speed increase ratio) is determined according to the mechanical inertia index.

[0087] In one embodiment, the inner gear ring of the gear speed increaser 12 is fixed, the planetary wheel arm is the input shaft, is connected to the rotor shaft of the synchronous phase modifier 11 through a shaft coupling, the sun wheel shaft is the output shaft, is connected to the input shaft of the inertia flywheel 13 through a shaft coupling, and the rotor speed increase of the inertia flywheel 13 is realized.

[0088] In one embodiment, the gear meshing pair and the supporting bearing inside the speed increaser are lubricated through an oil lubrication system.

[0089] In one embodiment, the power grid is a high-voltage bus 7 providing three-phase alternating current.

[0090] In one embodiment, the first stator is connected with the high-voltage bus 7 through a step-up transformer, so that a synchronous rotating electromagnetic field is formed in the first stator.

[0091] In one embodiment, the second rotor is made of high-strength metal material.

[0092] In summary, through the unique design of the utility model, compared with the prior art, the utility model has the following advantages: (A) has inertia and phase modulation composite function: can simultaneously provide inertia support and reactive power regulation function. (B) small floor area: the inertia phase modifier body adopts a vertical arrangement mode, has small floor area, is easy to realize phase modifier miniaturization and distributed arrangement; the axes of the synchronous phase modifier rotor and the inertia flywheel rotor overlap, reduces construction cost. Suitable for distributed small-capacity system, easy to be flexibly arranged at power grid distribution nodes. The inertia phase modifier body can be expanded by modularization to form a phase modifier array of different capacities, centralized control, has capacity configuration flexibility, and is suitable for different application occasions. (C) capacity flexible configuration: through a plurality of body devices to form an array module, expand into a system of different capacities, centralized control, can realize optimal configuration of inertia and reactive power regulation resources according to power grid demand. (D) high inertia density and energy density: adopts a planetary gear speed increaser, obtains a large speed increase ratio under a smaller volume and mass, so as to have large inertia constant and energy, can realize miniaturization and light weight of the body device, reduces energy consumption, and improves efficiency. The speed increase gear box adopts a planetary gear box, so that the axes of the phase modifier rotor and the inertia flywheel rotor are the same, the structure is compact, has high inertia and high energy under unit mass and volume. (E) low equipment operation and maintenance cost, the synchronous phase modifier adopts a brushless excitation system, reduces operation and maintenance difficulty.

[0093] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A distributed vertical inertia phase modifier system, characterized by, The inertia phase modifier body (1) includes vertically arranged synchronous phase modifier (11), gear speed increaser (12) and inertia flywheel (13), the synchronous phase modifier (11) includes first stator and first rotor, the inertia flywheel (13) includes second rotor;The rotor shaft of the first rotor, the rotor shaft of the second rotor are connected by the gear speed increaser (12) and the axes of the two coincide; The inertia phase modifier body (1) is connected with the electrical primary system (3) and the starting system (4) by the switch (5), and the electrical primary system (3) and the starting system (4) are connected in parallel on the power grid; The inertia phase modifier body (1) is also connected with the excitation system (2) and the auxiliary system (6) for ensuring safe and reliable operation. The auxiliary system (6) includes cooling system (61), vacuum system (62) and monitoring protection system (63); The cooling system (61) is connected or communicated with the synchronous phase modifier (11), the gear speed increaser (12) and the inertia flywheel (13) through the cooling pipeline respectively; The vacuum system (62) is connected or communicated with the inertia flywheel (13) through the air extraction pipeline, so as to ensure the vacuum degree of the inertia flywheel (13). The monitoring protection system (63) is connected with at least one sensor, and the sensor is arranged on the inertia phase modifier body (1).

2. The distributed vertical inertia phase modifier system of claim 1, wherein, The synchronous phase modifier (11), the gear speed increaser (12) and the inertia flywheel (13) are positioned and connected by end flange and bolt, and the central axes of the synchronous phase modifier (11), the gear speed increaser (12) and the inertia flywheel (13) coincide.

3. The distributed vertical inertia phase modifier system of claim 2, wherein, The excitation system (2) is a brushless excitation system, and includes an AC excitation circuit and a main excitation circuit (27).

4. The distributed vertical inertia phase modifier system of claim 3, wherein, The AC excitation circuit includes a series connection of an excitation transformer (21), a power rectifier (22), a de-excitation switch (23) and an excitation winding (26). The input end of the excitation transformer (21) is connected with a power supply, the output end of the excitation transformer (21) is connected with one end of the power rectifier (22), the other end of the power rectifier (22) is connected with one end of the de-excitation switch (23), the other end of the de-excitation switch (23) is connected with the excitation winding (26), and the excitation winding (26) is arranged on the first stator. The power rectifier (22) is further connected with an excitation adjusting device (25). The de-excitation switch (23) is further connected with a magnetizing device (24).

5. The distributed vertical inertia phase modifier system of claim 3, wherein, The first rotor is a hidden pole rotor, and the main excitation circuit (27) is arranged on the first rotor. The main excitation circuit (27) includes an AC excitation machine armature, a rotating rectifier and a main excitation winding, which can rotate at a synchronous speed, and the AC excitation machine armature, the rotating rectifier and the main excitation winding are relatively static and electrically fixedly connected.

6. The distributed vertical inertia phase modifier system according to claim 2, wherein The inertia flywheel (13) further includes a shell. The second rotor is in a cylindrical shape. The support bearing of the second rotor adopts a magnetic bearing or a mechanical bearing combination structure; The upper and lower ends of the second rotor are respectively provided with radial bearings for bearing the radial load generated during operation of the rotor; The inner part of the upper or lower end cover of the shell is provided with an axial bearing for bearing the axial load, i.e. the gravity of the second rotor; The upper and lower rotor shaft ends of the second rotor and the shaft holes of the upper and lower end covers, and the upper and lower end covers and the shell are provided with sealing devices.

7. The distributed vertical inertia phase modifier system of claim 1, wherein, The first rotor speed is denoted as n sc， The moment of inertia of the second rotor is denoted as J. if The moment of inertia J converted to the rotor of the synchronous condenser (11) if1 The calculation formula is as follows: (Formula One); In the formula one: the rotating speed of the second rotor is n if = i x n sc , unit: revolution per minute; i is the transmission ratio of the gear speed increaser, i.e. the ratio of the rotating speed of the output shaft of the gear speed increaser to the rotating speed of the input shaft.

8. The distributed vertical inertial phase modifier system according to claim 1, wherein the synchronous phase modifier (11) adopts a static frequency converter (SFC) starting mode, and is switched between the electrical primary system (3) and the starting system (4) through a switch (5); when starting, the switch (5) is automatically switched to the circuit connected with the starting system (4); the static frequency converter (SFC) includes two groups of three-phase bridge thyristors, one of which is used for rectification and the other is used for inversion; the conduction angle of the three-phase bridge thyristors is adjusted through a frequency converter control device, so that the speed of the synchronous phase modifier (11) gradually rises from a static state to a synchronous speed, and then the switch (5) is switched to the circuit of the electrical primary system (3) to enter the running condition.

9. The distributed vertical inertial phase modifier system according to claim 1, wherein the gear speed increaser (12) adopts a NGW single machine planetary gear transmission mechanism, so as to realize speed increase and keep the input shaft and the output shaft coaxial; The inner gear ring of the gear speed increaser (12) is fixed, the planetary wheel arm is the input shaft, which is connected to the rotor shaft of the synchronous phase modifier (11) through a shaft coupling, the sun wheel shaft is the output shaft, which is connected to the input shaft of the inertial flywheel (13) through a shaft coupling, so as to realize speed increase of the rotor of the inertial flywheel (13); The gear meshing pairs and support bearings inside the speed increaser are lubricated through an oil lubrication system. The power grid is a high-voltage bus (7) providing three-phase alternating current; The first stator is connected with the high-voltage bus (7) through a step-up transformer, so that a synchronous rotating electromagnetic field is formed in the first stator; 10. The distributed vertical inertia phase modifier system of claim 1, wherein, The second rotor is made of high-strength metal material. ​ ​

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