CN110854923A - Mass block device for improving inertial response of synchronous motor and using method thereof - Google Patents

Mass block device for improving inertial response of synchronous motor and using method thereof Download PDF

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Publication number
CN110854923A
CN110854923A CN201911124557.5A CN201911124557A CN110854923A CN 110854923 A CN110854923 A CN 110854923A CN 201911124557 A CN201911124557 A CN 201911124557A CN 110854923 A CN110854923 A CN 110854923A
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China
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mass
mass block
inertia
synchronous motor
central disc
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陈巨龙
薛毅
张裕
何向刚
罗宁
王健
赵庆明
邓朴
罗文雲
张方银
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Guizhou Power Grid Co Ltd
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Guizhou Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/02—Additional mass for increasing inertia, e.g. flywheels
    • H02K7/025—Additional mass for increasing inertia, e.g. flywheels for power storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

Abstract

The invention discloses a mass block device for improving the inertial response of a synchronous motor and a using method thereof, wherein the mass block device comprises two mass blocks, a central disc and a rotating shaft, the two mass blocks are of a circular ring structure, are uniformly and annularly divided into four equal 1/4 mass blocks, are fixedly connected to two sides of the central disc respectively by bolts, the rotating shaft is fixedly connected to the middle part of the central disc, and the rotating shaft is fixedly connected with a motor rotor. The mass block device can meet the requirements of the synchronous motor on different rotational inertias of the system, and improves the inertia supporting effect of the synchronous motor on the power grid. The mass blocks and the threaded holes are symmetrically and uniformly distributed, so that the stress of each mass block is uniform when the motor rotates at a high speed, and the centrifugal force of the mass block device is uniformly distributed; the center disc and the mass block are tightly attached through the concave-convex matching of the center disc and the mass block, so that the positioning function is realized, the accuracy of adding the rotational inertia is improved, the fastening design and the material consumption are simplified, and the high-speed rotation stability can be kept during high-speed rotation.

Description

Mass block device for improving inertial response of synchronous motor and using method thereof
Technical Field
The invention belongs to the technical field of improving the inertial response of a synchronous motor, and particularly relates to a mass block device for improving the inertial response of the synchronous motor and a using method thereof.
Background
With the fact that the proportion of new energy power generation in the system is larger and larger, the control capability of the system to the frequency is gradually limited due to weak inertia response of new energy grid connection to a power grid and insufficient primary frequency modulation capability, and the control capability becomes an obstacle to new energy development. The 'power grid friendly' new energy requires high power generation efficiency, can resist certain faults, actively participates in active-frequency regulation of the power grid, and improves the stability of the system. For a wind generating set, the active output size of the variable-speed wind generating set is determined by the current wind speed, the corresponding power value on the maximum power tracking curve is calculated to be used as a reference instruction for the control of the converter, and an active power decoupling control strategy and a reactive power decoupling control strategy are adopted, so that the rotational inertia of the fan is hidden. Similarly, photovoltaic power generation exhibits zero inertial response because it has no rotating components at all. Therefore, after a large number of fans or photovoltaic devices are connected into the power grid, the effective inertia of the power grid can be reduced along with the increase of the permeability of new energy. And research has shown that when the permeability of the fan reaches 10%, the rotational inertia of the system is obviously reduced. The inertia reflects the buffer capacity of the new energy to the frequency change, and guarantees that the new energy unit has enough time to realize the adjustment of active power when the load disturbance amount is large.
In order to solve the above problems, many improvements have been proposed by scholars at home and abroad. For wind power generation, a fan can participate in system frequency modulation by reserving a certain power reserve, active reserve control of a variable-speed wind turbine unit refers to that a wind power plant gives up maximum power tracking, and a part of adjustable power is reserved in the wind power plant during steady-state operation so as to participate in frequency adjustment during frequency change. The reserve power control strategy includes direct pitch angle reserve control and modified maximum power tracking curve control. Some researches on a frequency control method of the fan, and a rotating speed signal is fed back to a fan control system and a corresponding active power instruction is obtained through calculation. The instruction is added with the original power instruction to obtain a converter power reference instruction, so that the inertial support capability of the wind turbine generator set on the system frequency change is realized. A control method for overspeed load shedding operation of a wind power plant by modifying a power curve is also researched, and primary frequency modulation is completed by active/frequency droop control. The existing literature researches a load shedding control scheme combining overspeed and variable pitch, so that a wind turbine generator can perform primary frequency modulation by using the pitch angle/frequency droop characteristic. For photovoltaic power generation, the existing frequency modulation measures mainly comprise active-frequency static characteristics, an additional energy storage device and the like imitating a conventional unit. Due to the particularity of the photovoltaic power supply, the capacity of the photovoltaic power supply for participating in system frequency modulation is very limited, and the frequency modulation function is completed through the supporting function of a standby power or an energy storage system reserved on the photovoltaic power supply similar to a wind turbine generator. And few researches related to the photovoltaic participation in frequency modulation in a large power grid exist. The solution can support the system frequency to a certain extent, but the frequency modulation characteristic of the synchronous generator is simulated by a control means, on one hand, the motion characteristic of the synchronous generator cannot be completely simulated, so that the synchronous generator has inherent difference from the traditional synchronous motor; on the other hand, the control strategy is complex, and the parameters are not easy to set. And the frequency modulation of new energy needs the support of energy memory, has also additionally increased the investment cost of new energy factory station.
The negative impact of the lack of new energy inertia on the system frequency is undoubted. In recent years, researchers have proposed a "virtual inertia" control technology, or a virtual synchronous generator technology and a synchronous converter technology, and the method simulates the rotor inertia and the system frequency modulation characteristic of synchronous power generation on the basis of an electromechanical transient model of a synchronous generator in frequency control.
The above method is also not perfect and is not satisfactory in the following main aspects: (1) whether there is a sufficient source of energy. The virtual inertia control aims at releasing energy in a fan rotor or a converter direct-current side capacitor to provide inertia, the dependence of the released energy and the frequency modulation effect on the rotating speed of the fan or the energy storage of the capacitor before disturbance occurs is high, and whether enough energy sources exist is a problem to be solved by the method; (2) reliability of frequency adjustment. In order to ensure that the rotor can recover the optimal rotating speed again after the disturbance is recovered, temporarily "borrowed" kinetic energy needs to be "returned" to the rotor, so that active power needs to be absorbed from the power grid, on one hand, the frequency recovery process of the system is lengthened, on the other hand, the power shortage of the power grid can be aggravated, and the potential risk of further reduction of the frequency exists.
In summary, the existing control strategies and hardware measures for improving the inertia of the power grid cannot well provide sufficient and stable inertia response and frequency support for the system.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the mass block device for improving the inertia response of the synchronous motor and the using method thereof are provided, the traditional synchronous motor theory is used for reference, the inertia is improved for the system in a grid-connected mode of the synchronous motor, the realization is simple, the operation is reliable, and different rotational inertia is provided for the system by the synchronous motor through increasing and decreasing the mass block. And the configuration of the mass block has flexibility and diversity, and can meet the requirements of the moment of inertia in different scenes so as to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a promote synchronous machine to mass block device of inertial response, includes two mass blocks, central disc and pivot, and two mass blocks are the ring structure, and the homocyclic ring is to cutting apart into equiangular four 1/4 mass blocks, all adopts the bolt to do fixed connection in central disc both sides, and pivot fixed connection is in central disc middle part, pivot and electric motor rotor fixed connection.
Preferably, the outer edge of one side of the mass block close to the central disc is provided with an annular convex belt, the outer edges of two sides of the central disc are provided with annular groove belts, the convex belts are embedded into the annular groove belts to keep fit, and the outer diameter, the thickness and the manufacturing material of the mass block and the central disc are the same.
A use method of a mass block device for improving the inertial response of a synchronous motor comprises the following steps: evenly set up twelve screw holes on the disc of center disc, install eight 1/4 quality pieces additional at most in its both sides, install the quality piece of different quantity additional under the prerequisite of keeping center disc symmetry promptly, install zero block, two or four 1/4 quality pieces respectively additional to the quality piece of one side, should satisfy to the quality piece:
R1＞Rr(1)
l＞3D (2)
wherein R is1Is the inner diameter, R, of the massrIs the radius of the rotating shaft, unit m; l is the length of the rotating shaft, and D is the thickness of the mass block in m.
The total moment of inertia of 1/4 masses mounted on both sides of the center disk was calculated:
Figure RE-GDA0002310108020000041
Figure RE-GDA0002310108020000043
Figure RE-GDA0002310108020000044
wherein D is the thickness of the mass block 1 and the unit m; ρ is the bulk density of the mass 1 in kg/m3Determined according to the material of the mass block 1; r2Is the outer diameter, R, of the mass 11Is a mass block 1Inner diameter of (d), in m; m is the overall mass of the central disc 4 in kg; j. the design is a square1Is the moment of inertia of the mass 1, J0Is the moment of inertia of the central disc 4 in kg · m2；JmThe rotational inertia of the mass block system under different mass block modes; i is the number of masses ( i 0,2,4,6,8) on which 1/4 are assembled together on both sides.
For the moment of inertia of the rotating shaft, the calculation formula is as follows:
Figure RE-GDA0002310108020000045
where rhorThe bulk density of the rotating shaft is in kg/m3(ii) a l is the length of the rotating shaft and is in m; rrIs the radius of the rotating shaft, unit m; j. the design is a squarerThe moment of inertia of the shaft is expressed in kg.m2；
The rotational inertia J of the whole synchronous motor pair system is the rotational inertia J of the rotating shaftrAnd a mass block device JmSumming; the same moment of inertia, converted into an inertia time constant, is:
wherein S isNThe rated capacity of the synchronous motor to the system is unit VA; omega0The rated angular speed of the synchronous motor to the system is in unit rad/s;
the rotational kinetic energy contained by the synchronous motor pair system is shown in formula (7), and the rotational kinetic energy e (j) represents all the kinetic energy stored by the synchronous motor pair system:
the invention has the beneficial effects that: compared with the prior art, the mass block device can meet the requirements of the synchronous motor on different rotational inertia of the system, and improves the inertia supporting effect of the synchronous motor on the power grid. The mass blocks and the threaded holes are symmetrically and uniformly distributed, so that the stress of each mass block is uniform when the motor rotates at a high speed, and the centrifugal force of the mass block device is uniformly distributed; the center disc and the mass block are tightly attached through the concave-convex matching of the center disc and the mass block, so that the positioning function is realized, the accuracy of adding the rotational inertia is improved, the fastening design and the material consumption are simplified, and the high-speed rotation stability can be kept during high-speed rotation.
Drawings
FIG. 1 is a schematic perspective view of a mass block apparatus according to the present invention;
FIG. 2 is a left side view of the mass block apparatus of the present invention;
FIG. 3 is a schematic side view of the mass apparatus of the present invention;
FIG. 4 is a schematic plan view of 1/4 mass block structure of the mass block apparatus of the present invention;
FIG. 5 is a schematic view of a bolt structure of the mass block device according to the present invention;
FIG. 6 is a schematic side view of a center disk of the mass apparatus of the present invention;
fig. 7 is a perspective view of a mass assembly scheme 1 of the mass device of the present invention;
fig. 8 is a schematic perspective view of a mass assembly scheme 2 of the mass apparatus of the present invention;
fig. 9 is a schematic perspective view of a mass assembly scheme 3 of the mass apparatus of the present invention;
fig. 10 is a perspective view of a mass assembly scheme 4 of the mass device of the present invention.
Detailed Description
The invention is further described below with reference to specific examples.
Example 1: as shown in fig. 1-10, a mass block device for improving the inertial response of a synchronous motor comprises two mass blocks 1, a central disc 4, a rotating shaft 3, a spring gasket 5 and a flat gasket 6, wherein 12 screw holes 7 are uniformly arranged on the circumferential direction of the central disc 4, the two mass blocks 1 are of a circular ring structure, are uniformly and annularly divided into four equal 1/4 mass blocks 8, are respectively and fixedly connected to two sides of the central disc 4 by screwing bolts 2 into the screw holes 7, the rotating shaft 3 is fixedly connected to the middle part of the central disc 4, the rotating shaft 3 is fixedly connected (rigidly connected) with a motor rotor, so that the mass blocks rotate at the same speed along with the motor rotor when the motor runs, and the spring gasket 5 and the flat gasket 6 are arranged at the joint of the large; the outer edge of one side of the mass block 1 close to the central disc 4 is provided with an annular convex belt, the outer edge of two sides of the central disc 4 is provided with an annular groove belt, the convex belt is embedded into the annular groove belt to keep fit, and the outer diameter, the thickness and the manufacturing material of the mass block 1 and the central disc 4 are the same. The invention aims to increase the physical inertia of the synchronous motor by adding a mass block device on a rotor shaft of the synchronous motor, and improve the inertia supporting effect of new energy on grid connection through the synchronous motor. And the mass block device can flexibly change the configuration of the mass block, so that the synchronous motor has different rotational inertia to the system, and the requirement of multi-scene rotational inertia is met.
Example 2: as shown in fig. 1-10, a method for using a mass block device for improving the inertia response of a synchronous motor comprises the following steps: twelve screw holes 7 are uniformly arranged on the circular surface of the central disc 4, eight 1/4 mass blocks 8 are additionally arranged on two sides of the central disc, different number of mass blocks are additionally arranged on the premise of keeping the symmetry of the central disc 4, namely, zero mass blocks, two mass blocks or four 1/4 mass blocks 8 are additionally arranged on the mass block 1 on one side, different assembly schemes are respectively shown in figures 7-10, and the requirements for the mass blocks 1 are as follows:
R1＞Rr(1)
l＞3D (2)
wherein R is1Is the inner diameter, R, of the mass 1rIs the radius of the rotating shaft 3, in m; l is the length of the rotating shaft, and D is the thickness of the mass block 1 in m.
In which fig. 1 shows the situation in which all the masses are installed, and fig. 7 corresponds to the situation in which six masses are installed, wherein different forms are possible. The mass blocks 1 on both sides can meet the requirement only by removing two 1/4 mass blocks 8 in central symmetry.
Fig. 8 shows a state where four masses are mounted to the device, wherein various forms are possible. The requirement can be met only by removing the mass block 1 on one side.
Fig. 9 shows a state in which two masses are mounted to the device, wherein various forms are possible. It can be satisfied by removing all the mass blocks 1 on one side and removing the two mass blocks centrosymmetrically.
Fig. 10 shows the device in a state where the two mass blocks 1 on both sides are removed completely, and the total moment of inertia of the device is provided by the central disk.
The total moment of inertia of 1/4 masses 8 mounted on either side of the central disc is calculated:
Figure RE-GDA0002310108020000071
Figure RE-GDA0002310108020000072
Figure RE-GDA0002310108020000073
Figure RE-GDA0002310108020000074
wherein D is the thickness of the mass block 1 and the unit m; ρ is the bulk density of the mass 1 in kg/m3Determined according to the material of the mass block 1; r2Is the outer diameter, R, of the mass 11Is the inner diameter of the mass block 1 in m; m is the overall mass of the central disc 4 in kg; j. the design is a square1Is the moment of inertia of the mass 1, J0Is the moment of inertia of the central disc 4 in kg · m2；JmThe rotational inertia of the mass block system under different mass block modes; i is the number of masses ( i 0,2,4,6,8) on which 1/4 are assembled together on both sides.
It is noted that although the surface of the mass 1 has threaded holes, the threaded holes of the mass are filled with the same material, since in practice bolts are inserted, while the mass of the nut is negligibly small compared to the mass. And the thickness of the central disc 4 is the same as that of the mass 1, the above formula can be used for the estimation of the moment of inertia.
Since the mass on each side contains three mass modes, the device can be additionally provided with zero, two, four, six and eight 1/4 masses 8. The mass block adjustment has more modes, so that the inertia adjustment diversity of the device is increased, and the requirements of the rotary inertia under different scenes are met.
The device and the rotational inertia of the rotating shaft 3 jointly form the rotational inertia of the synchronous motor pair system. For the moment of inertia of the shaft 3, the calculation formula is as follows:
where rhorThe bulk density (kg/m) of the rotating shaft 33) (ii) a l is the length (m) of the shaft 3; rrRadius (m) of the rotating shaft 3; j. the design is a squarerIs the moment of inertia (kg · m) of the shaft 32)。
The moment of inertia J of the whole synchronous motor pair system should be the moment of inertia J of the rotating shaftrAnd a mass block device JmAnd (4) summing.
The same moment of inertia, converted into an inertia time constant, is:
wherein SNRated capacity (VA) of the system for the synchronous machine; omega0Is the rated angular velocity (rad/s) of the synchronous machine to the system.
Further, the rotational kinetic energy contained in the synchronous motor pair system is shown in formula (7), and the rotational kinetic energy e (j) represents all the kinetic energy stored by the synchronous motor pair system.
Figure RE-GDA0002310108020000083
With the dimensions and material parameters of the device known, the moment of inertia of the mass can be estimated by equations (1) - (4); the moment of inertia of the rotating shaft can be estimated through the formula (5); the equations (6) and (7) can be used to calculate the inertia time constant and the rotational kinetic energy of the synchronous motor pair system, respectively.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.

Claims (4)

1. A mass block device for improving the inertial response of a synchronous motor is characterized in that: the two mass blocks (1) are of a circular ring structure, are uniformly divided into four equal 1/4 mass blocks (8) by a ring, are respectively fixedly connected to two sides of the central disc (4) by bolts (2), are fixedly connected to the middle of the central disc (4), and are fixedly connected to a motor rotor (3).
2. The mass apparatus for elevating the inertial response of a synchronous machine according to claim 1, wherein: the outer edge of one side, close to the central disc (4), of the mass block (1) is provided with an annular convex belt, the outer edges of two sides of the central disc (4) are provided with annular groove belts, the convex belts are embedded into the annular groove belts to be kept attached, and the outer diameter, the thickness and the manufacturing materials of the mass block (1) and the central disc (4) are the same.
3. Use of a mass means for increasing the inertial response of a synchronous machine according to any one of claims 1-2, characterized in that: the method comprises the following steps: evenly set up twelve screw holes (7) on the disc of center disc (4), install eight 1/4 quality pieces (8) additional at most in its both sides, install different quantity quality pieces additional under the prerequisite of the symmetry that keeps center disc (4), install zero block, two or four 1/4 quality pieces (8) respectively additional to quality piece (1) of one side promptly, should satisfy to quality piece (1):
R1＞Rr(1)
l＞3D (2)
wherein R is1Is the inner diameter, R, of the mass (1)rIs the radius of the rotating shaft (3) and has a unit m; l is the length of the rotating shaft, and D is the thickness of the mass block (1) in m.
4. The use of a mass block device for improving the inertial response of a synchronous machine according to claim 3, characterized in that: the total moment of inertia of 1/4 masses (8) mounted on both sides of the central disc is calculated:
Figure FDA0002276403010000011
Figure FDA0002276403010000021
Figure FDA0002276403010000022
Figure FDA0002276403010000023
where ρ is the bulk density of the mass (1) in kg/m3Determined according to the material of the mass block 1; r2Is the outer diameter of the mass block (1) in m; m is the integral mass of the central disc (4) in kg; j. the design is a square1Is the moment of inertia of the mass (1), J0Is the moment of inertia of the central disc (4) in kg.m2；JmThe rotational inertia of the mass block system under different mass block modes; i is the number of masses 1/4 assembled together on both sides, i being 0,2,4,6 or 8.
For the moment of inertia of the rotating shaft, the calculation formula is as follows:
Figure FDA0002276403010000024
where rhorThe bulk density of the rotating shaft is in kg/m3；JrIs the moment of inertia of the shaft, in kg·m2；
The rotational inertia J of the whole synchronous motor pair system is the rotational inertia J of the rotating shaftrAnd a mass block device JmSumming; the same moment of inertia, converted into an inertia time constant, is:
Figure FDA0002276403010000025
wherein S isNThe rated capacity of the synchronous motor to the system is unit VA; omega0The rated angular speed of the synchronous motor to the system is in unit rad/s;
the rotational kinetic energy contained by the synchronous motor pair system is shown in formula (7), and the rotational kinetic energy e (j) represents all the kinetic energy stored by the synchronous motor pair system:
Figure FDA0002276403010000026
CN201911124557.5A 2019-11-18 2019-11-18 Mass block device for improving inertial response of synchronous motor and using method thereof Pending CN110854923A (en)

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CN201811829U (en) * 2010-08-31 2011-04-27 中国飞行试验研究院 Exciting force generation device
CN103603869A (en) * 2013-09-29 2014-02-26 江门市瑞荣泵业有限公司 Thrust bearing structure of submersible motor used for well
CN105972153A (en) * 2016-07-28 2016-09-28 易随科技股份有限公司 Inertia flywheel transmission component and system with same
CN207910610U (en) * 2018-03-20 2018-09-25 安徽美芝制冷设备有限公司 Rotor assembly, motor and compressor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201811829U (en) * 2010-08-31 2011-04-27 中国飞行试验研究院 Exciting force generation device
CN103603869A (en) * 2013-09-29 2014-02-26 江门市瑞荣泵业有限公司 Thrust bearing structure of submersible motor used for well
CN105972153A (en) * 2016-07-28 2016-09-28 易随科技股份有限公司 Inertia flywheel transmission component and system with same
CN207910610U (en) * 2018-03-20 2018-09-25 安徽美芝制冷设备有限公司 Rotor assembly, motor and compressor

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