A rotor winding end structure of a generator for simulation and a construction method thereof

Abstract

The present invention discloses a rotor winding end structure of a simulation generator and a construction method thereof, which solves the problem that an additional simulation test control box needs to be added in order to change certain impedance parameters and time constants of the simulation generator in the existing simulation experiment. A magnetic conductive support ring (3) is arranged between the non-driving end shaft end (1) of the simulation generator and the rotor excitation winding end (2) of the simulation generator. A magnetic conductive guard ring (5) of the rotor excitation winding end is arranged outside the rotor excitation winding end (2) and the magnetic conductive support ring (3) of the simulation generator. The magnetic conductive support ring (3), the magnetic conductive guard ring (5) and the magnetic conductive protrusion block (4) surrounding the rotor excitation winding end (2) of the simulation generator form a closed magnetic conductive annular loop. The present invention only plays the role of delaying the relevant time constant, while the structure still retains the function of supporting and fastening the winding end.

Description

Technical Field

[0001] The invention relates to a generator, in particular to a winding end of a simulated generator used when verifying the running stability and dynamic performance of a designed large-scale generator. Background Art

[0002] When designing the electromagnetic system of a new large synchronous generator, in order to predict the stable performance and dynamic performance of the designed large generator during future operation and reduce the risk of electromagnetic design errors of the large generator, a simulation verification method of simulating large generators is usually used to simulate and verify the electromagnetic parameters of the designed large generator. The specific method is: build a simulation platform for the designed large motor in the laboratory, and use a simulated test generator with a capacity far smaller than that of the large synchronous generator to simulate the large-capacity synchronous generator; use some simulated load equipment and power grid equipment to simulate the power grid and load; use a dedicated control system and control software to control various related simulation experimental equipment and systems, so that a test simulation generator system composed of physical simulation hardware and simulation software is formed to simulate various steady-state and dynamic operating conditions, as well as fault conditions of the designed large synchronous generator, so as to verify the reliability and stability of the electromagnetic performance of the designed large synchronous generator and guide the design process of designers; the above-mentioned simulation experimental generator set is an important device of the simulation system The electromagnetic performance parameters of the simulated experimental generator set need to be basically close to the electromagnetic performance parameters of the simulated generator set, especially some impedance parameters and time constants, among which the main time constants include the excitation winding time constant when the armature winding is open-circuited, the direct-axis transient time constant, the direct-axis super-transient time constant, and the armature time constant; in the simulation test process, it is necessary to make the simulated impedance parameters and the simulated time constants simulated close to the parameters of the designed large-scale generator at the same time. The existing technology is to add some auxiliary devices to the test system to adjust these dynamic parameters to achieve the purpose of making the impedance parameters and time constants close; the most common method is: after the simulated generator rotor excitation winding is led out, a control box is set outside the motor, and additional inductance or negative resistance is connected in series in the control box to change certain impedance parameters and time constants of the simulated generator, so that the impedance parameters and time constants of the simulated generator are close to the impedance parameters and time constants of the designed large-scale generator. This technical solution not only increases the cost of the simulation test system, but also occupies laboratory space. Summary of the invention

[0003] The present invention provides a rotor winding end structure of a simulation generator and a construction method thereof, which solves the technical problem that an additional simulation test control box needs to be added in order to change certain impedance parameters and time constants of the simulated generator in existing simulation experiments.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The overall concept of the present invention is: in the simulation test, since the capacity of the model generator used is much smaller than the capacity of the large generator in the design, the excitation inductance and time constant of the simulated generator are very small, and it is difficult to achieve the same per-unit value as the large generator, and the excitation winding inductance needs to be increased; the present invention utilizes the existing space at the end of the excitation winding of the simulated generator to increase the excitation winding inductance of the simulated generator without occupying additional space in the laboratory, thereby achieving the purpose of adjusting the impedance parameters and time constant of the simulated generator, and at the same time plays a positive role in smoothing the fluctuation of the excitation current; since the original rotor winding inner ring of the simulated generator is provided with a support ring, an insulating layer is provided between the support ring and the winding, and an insulating guard ring is provided at the outer end of the outer ring of the rotor winding to prevent the winding from being thrown out due to rotation, due to the insulating guard ring The ring is made of non-magnetic material, and an insulating layer is also arranged between the support ring and the winding, so that the leakage magnetic flux at the end of the winding of the simulated generator is very small, and the end leakage inductance is also very small; the present invention makes full use of the above structural parts, replaces the insulating protective ring with magnetic conductive material, removes the insulating layer between the support ring and the winding, and constructs magnetic conductive protrusion blocks with equal intervals of arc between the support ring and the magnetic conductive protective ring. At the end of the simulated motor winding, the support ring, the magnetic conductive protrusion block and the magnetic conductive protective ring form a closed magnetic conductive loop, thereby increasing the excitation of the simulated generator rotor winding during the simulation experiment, replacing the traditional method of setting a control box outside the motor after the simulated generator rotor excitation winding is led out, and connecting additional inductance or negative resistance in series in the control box, thereby achieving the purpose of adjusting the rotor impedance parameters and time constant of the simulated generator without adding equipment.

[0006] A rotor winding end structure of a simulation generator comprises a non-drive end shaft end of a test simulation generator, a rotor excitation winding end of a test simulation generator is arranged on the non-drive end shaft end of the test simulation generator, a magnetic conductive support ring is arranged between the non-drive end shaft end of the test simulation generator and the rotor excitation winding end of the test simulation generator, a magnetic conductive guard ring of the rotor excitation winding end is arranged on the outer side of the rotor excitation winding end of the test simulation generator and the magnetic conductive support ring, a magnetic conductive protrusion block is arranged on the magnetic conductive support ring on the inner side of the rotor excitation winding end of the test simulation generator, and the magnetic conductive support ring, the magnetic conductive guard ring and the magnetic conductive protrusion block surrounding the rotor excitation winding end of the test simulation generator form a closed magnetic conductive annular loop.

[0007] The magnetically conductive protruding block is arranged in a hole surrounded by the end of the excitation winding of the rotor of the simulated generator for testing and the rotor iron core.

[0008] A method for constructing a rotor winding end structure of a generator for simulation, characterized by the following steps:

[0009] The first step is to determine the number of magnetic conductive protrusions according to the number of groups of the test simulated generator rotor excitation windings;

[0010] Step 2: According to the number of magnetic conductive protrusion blocks determined in the first step, a magnetic conductive support ring with the number of magnetic conductive protrusion blocks is manufactured;

[0011] The third step is to set the magnetic conductive support ring with the magnetic conductive protrusion block prepared in the second step between the end of the non-driving end shaft of the test simulated generator and the end of the rotor excitation winding of the test simulated generator, so that the magnetic conductive protrusion block is inserted into the hole surrounded by the end of the rotor excitation winding of the test simulated generator and the rotor core;

[0012] The fourth step is to set a magnetic conductive guard ring at the end of the rotor excitation winding of the test simulated generator on the outer side of the magnetic conductive support ring, so that the magnetic conductive support ring, the magnetic conductive guard ring and the magnetic conductive protrusion block surrounding the end of the rotor excitation winding of the test simulated generator form a closed magnetic conductive annular loop.

[0013] When current flows through the rotor excitation winding of the present invention, the end leakage flux increases significantly and the excitation inductance increases due to the high magnetic permeability of the soft magnetic material. When a transient process such as a sudden short circuit occurs, since the soft magnetic core is solid iron, the eddy current in the core acts as a damper when the magnetic field alternates, so that the ultra-transient reactance of the winding is not greatly affected by this improvement. The present invention only serves to delay the relevant time constant. At the same time, the structure still retains the function of supporting and fastening the winding end. In order to further simplify the structure and save space, the guard ring can also be integrated with functions such as a balance ring and a fan blade, which is a highly integrated multifunctional structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a schematic structural diagram of the magnetic conductive support ring 3 of the present invention;

[0016] Figure 3 It is a schematic structural diagram of the magnetic conductive guard ring 5 of the present invention;

[0017] Figure 4 It is a structural schematic diagram of a magnetic conductive protrusion block 4 of the present invention disposed in a hole 6 surrounded by an end portion 2 of a rotor excitation winding of a simulated generator for testing and a rotor core 7. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the accompanying drawings:

[0019] A rotor winding end structure of a simulation generator comprises a non-drive end shaft end 1 of a test simulated generator, a rotor excitation winding end 2 of a test simulated generator is arranged on the non-drive end shaft end 1 of the test simulated generator, a magnetic conductive support ring 3 is arranged between the non-drive end shaft end 1 of the test simulated generator and the rotor excitation winding end 2 of the test simulated generator, a magnetic conductive guard ring 5 of the rotor excitation winding end is arranged on the outer side of the rotor excitation winding end 2 and the magnetic conductive support ring 3 of the test simulated generator, a magnetic conductive protrusion block 4 is arranged on the magnetic conductive support ring 3 on the inner side of the rotor excitation winding end 2 of the test simulated generator, and the magnetic conductive support ring 3, the magnetic conductive guard ring 5 and the magnetic conductive protrusion block 4 surrounding the rotor excitation winding end 2 of the test simulated generator form a closed magnetic conductive annular loop.

[0020] The magnetically conductive protruding block 4 is arranged in a hole 6 surrounded by the end 2 of the rotor excitation winding of the test simulated generator and the rotor core 7.

[0021] A method for constructing a rotor winding end structure of a generator for simulation, characterized by the following steps:

[0022] The first step is to determine the number of magnetic conductive protrusions 4 according to the number of groups of the test simulated generator rotor excitation windings;

[0023] Step 2: According to the number of the magnetic conductive protrusion blocks 4 determined in the first step, a magnetic conductive support ring 3 with the number of the magnetic conductive protrusion blocks 4 is manufactured;

[0024] Step 3: The magnetic conductive support ring 3 with the magnetic conductive protrusion block 4 prepared in the second step is arranged between the non-driving end shaft end 1 of the test simulated generator and the rotor excitation winding end 2 of the test simulated generator, so that the magnetic conductive protrusion block 4 is inserted into the hole 6 surrounded by the rotor excitation winding end 2 of the test simulated generator and the rotor core 7;

[0025] The fourth step is to arrange a magnetic conductive guard ring 5 at the end of the rotor excitation winding on the outer side of the end 2 of the rotor excitation winding of the test simulated generator and the magnetic conductive support ring 3, so that the magnetic conductive support ring 3, the magnetic conductive guard ring 5 and the magnetic conductive protrusion block 4 surrounding the end 2 of the rotor excitation winding of the test simulated generator form a closed magnetic conductive annular loop.

Claims

1. A rotor winding end structure of a simulation generator, comprising a non-drive end shaft end (1) of a simulation generator for testing, a rotor excitation winding end (2) of a simulation generator for testing being arranged on the non-drive end shaft end (1) of the simulation generator for testing, and characterized in that: A magnetic conductive support ring (3) is provided between the non-drive end rotating shaft end (1) of the test simulated generator and the end (2) of the rotor excitation winding of the test simulated generator. A magnetic conductive guard ring (5) of the rotor excitation winding end is provided outside the end (2) and the magnetic conductive support ring (3). A magnetic conductive protrusion block (4) is provided on the magnetic conductive support ring (3) inside the end (2) of the rotor excitation winding of the test simulated generator. The magnetic conductive support ring (3), the magnetic conductive guard ring (5) and the magnetic conductive protrusion block (4) surrounding the end (2) of the rotor excitation winding of the test simulated generator form a closed magnetic conductive annular loop.

2. The rotor winding end structure of a simulation generator according to claim 1, characterized in that: The magnetically conductive protruding block (4) is arranged in a hole (6) surrounded by an end portion (2) of an excitation winding of a rotor of a simulated generator for testing and a rotor iron core (7).

3. A method for constructing a rotor winding end structure of a generator for simulation as claimed in claim 2, characterized by the following steps: The first step is to determine the number of magnetically conductive protruding blocks (4) according to the number of groups of excitation windings of the simulated generator rotor used for the test; Step 2: According to the number of magnetic conductive protrusions (4) determined in the first step, a magnetic conductive support ring (3) having the number of magnetic conductive protrusions (4) is manufactured; Step 3: The magnetic conductive support ring (3) with the magnetic conductive protrusion block (4) manufactured in the second step is arranged between the non-driving end shaft end (1) of the test simulated generator and the excitation winding end (2) of the rotor of the test simulated generator, so that the magnetic conductive protrusion block (4) is inserted into the hole (6) surrounded by the excitation winding end (2) of the rotor of the test simulated generator and the rotor core (7); The fourth step is to arrange a magnetic conductive guard ring (5) at the end of the rotor excitation winding of the test simulated generator on the outer side of the magnetic conductive support ring (3), so that the magnetic conductive support ring (3), the magnetic conductive guard ring (5) and the magnetic conductive protrusion block (4) surrounding the end of the rotor excitation winding of the test simulated generator (2) form a closed magnetic conductive annular loop.

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