CN112528545A - Finite element simulation method for turn-to-turn short circuit of stator winding of synchronous phase modulator - Google Patents
Finite element simulation method for turn-to-turn short circuit of stator winding of synchronous phase modulator Download PDFInfo
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Abstract
A finite element simulation method for stator winding turn-to-turn short circuit of a synchronous phase modulator is used for establishing a two-dimensional finite element simplified model of the synchronous phase modulator, and realizing adjustment of the working state of the phase modulator and fault setting of the stator winding turn-to-turn short circuit. The body model of the synchronous phase modulator is simplified through an equivalent area conversion method, so that the simulation efficiency is improved while the simulation precision is ensured; the external circuit model is utilized to realize that the synchronous phase modulator model operates in a phase modulation state; and performing stator winding turn-to-turn short circuit fault simulation by using the established phase modulator field coupling model, and providing reference for fault diagnosis of the synchronous phase modulator.
Description
Technical Field
The invention belongs to the technical field of motor finite element simulation, and particularly relates to a finite element simulation method for turn-to-turn short circuit of a stator winding of a synchronous phase modulator.
Background
In recent years, with the rapid development of extra-high voltage direct-current transmission, the strong and weak alternating characteristics of a power grid are outstanding, and particularly for a direct-current multi-feed receiving-end power grid, the problems of multi-loop direct-current commutation failure, insufficient dynamic reactive power storage and voltage support and the like exist, so that the large synchronous phase modulator as an excellent dynamic reactive power compensation device is popularized and applied in the power grid. The synchronous phase modulator can effectively solve the problem of reactive power regulation caused by high-voltage direct current and new energy accessed into a power grid, and has unique advantages of improving direct current transmission limit power, improving short-circuit ratio of a receiving end alternating current power grid of a high-voltage direct current transmission line and enhancing flexibility and stability of the power grid.
As large-scale rotating equipment, the phase modulator has a complex structure, and the stator winding is easy to cause turn-to-turn insulation damage and cause turn-to-turn short circuit fault of the stator winding. The short-circuit fault is often accompanied by large current, which may overheat and burn the motor, and cause great damage to the system. Therefore, the research on the turn-to-turn short circuit fault of the stator winding of the large synchronous phase modulator has important significance for realizing the online identification of the fault and maintaining the safe and stable operation of a power grid.
The finite element simulation analysis method is adopted to carry out numerical calculation on the electromagnetic field in the motor to obtain the accurate distribution of the electromagnetic field in the motor, and the operation characteristic of the stator after turn-to-turn short circuit fault is solved on the basis, so that the method is an effective research method for fault diagnosis of the phase modulator.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a finite element simulation method for stator winding turn-to-turn short circuit of a synchronous phase modulator, establish a two-dimensional finite element simplified model of the synchronous phase modulator, and realize the adjustment of the working state of the phase modulator and the fault setting of the stator winding turn-to-turn short circuit. The body model of the synchronous phase modulator is simplified through an equivalent area conversion method, so that the simulation efficiency is improved while the simulation precision is ensured; the external circuit model is utilized to realize that the synchronous phase modulator model operates in a phase modulation state; and performing stator winding turn-to-turn short circuit fault simulation by using the established phase modulator field coupling model, and providing reference for fault diagnosis of the synchronous phase modulator.
The invention adopts the following technical scheme.
The finite element simulation method of the turn-to-turn short circuit of the stator winding of the synchronous phase modulator comprises the following steps:
step 1, collecting operating parameters, structural data and material data of a synchronous phase modulator;
step 2, based on the structural data and the material data of the synchronous phase modulator, respectively converting a plurality of conductors in a stator winding coil into a stator winding coil conductor and a plurality of conductors in a rotor winding coil into a rotor winding coil conductor by using an equivalent area conversion method, building a two-dimensional finite element model of the synchronous phase modulator, and determining the material attribute, the boundary condition, the simulation area and the motion area of the rotor of the two-dimensional finite element model;
step 4, building an external stator circuit model and an external rotor circuit model of the synchronous phase modulator, realizing that a three-phase winding is connected to a three-phase power supply to simulate the grid-connected operation of the synchronous phase modulator, and realizing that a two-dimensional finite element model of the synchronous phase modulator operates in a phase modulator state by adjusting exciting current;
step 5, for the external circuit model of the stator part, dividing the winding model of the fault branch on the fault phase into a healthy winding model and a short-circuit winding model, and connecting the short-circuit winding model in parallel with the transition resistance model and then connecting the short-circuit winding model in series with the healthy winding model and the winding resistance model;
and 6, calculating short-circuit currents of different fault degrees between turns of the stator winding of the synchronous rectification camera at different fault positions based on a finite element simulation method.
Preferably, the first and second electrodes are formed of a metal,
in the step 1, the process is carried out,
the operating parameters include: rated voltage, rated current, rated exciting current, rated capacity, maximum phase advance capability, rotating speed and loss;
the structure data includes: the number of stator branches, the number of stator slots, the number of rotor slots, the outer diameter of a stator core, the inner diameter of the stator core, the length of the stator core, an air gap, the number of rotor slots, the outer diameter of a rotor, the number of turns of each rotor slot and the number of turns of each stator slot;
the material data includes: and the magnetic conductivity, the electric conductivity, the heat conductivity coefficient and the specific heat capacity of the rotor core and the stator core.
Preferably, the first and second electrodes are formed of a metal,
the step 2 comprises the following steps:
step 2.1, calculating the conductive sectional areas of a plurality of solid conductors and a plurality of hollow conductors which are connected in parallel in the stator winding coil based on the structural data of the synchronous phase modulator, and converting the conductive sectional areas into a stator winding coil conductor by using an equivalent area conversion algorithm; calculating the conductive sectional areas of a plurality of hollow conductors connected in parallel in the rotor winding coil, and converting the conductive sectional areas into a rotor winding coil conductor by using an equivalent area conversion method;
step 2.2, building a two-dimensional finite element model of the synchronous phase modulator;
step 2.3, setting material attributes of the two-dimensional finite element model based on the material data of the synchronous phase modulator;
and 2.4, determining the boundary condition, the simulation area and the motion area of the rotor.
Preferably, the first and second electrodes are formed of a metal,
in step 2.2, the two-dimensional finite element model of the synchronous phase modulator comprises: stator core model, rotor core model, stator winding model, rotor winding model.
Preferably, the first and second electrodes are formed of a metal,
in step 2.4, the process is carried out,
the boundary condition is the stator core model outer circumference;
the simulation areas are all areas within the outer circumference of the stator core model;
the rotor movement area is the area between the outer diameter of the rotor core pattern and the inner diameter of the stator core pattern.
Preferably, the first and second electrodes are formed of a metal,
the step 3 comprises the following steps:
step 3.1, carrying out grid division on a two-dimensional finite element model of the synchronous phase modulator, wherein the grid density of the stator winding model and the rotor winding model is greater than that of the stator core model and the rotor core model;
and 3.2, setting parameters of a solver, namely setting solving time and step length.
Preferably, the first and second electrodes are formed of a metal,
step 4 comprises the following steps:
step 4.1, building a stator part external circuit model and a rotor part external circuit model based on the actual connection mode of the windings of the synchronous phase modulator;
step 4.2, the three-phase winding of the synchronous phase modulator is connected to a three-phase power supply by utilizing a circuit model outside the stator part so as to simulate the grid-connected operation state of the synchronous phase modulator;
4.3, setting exciting current by using a partial external circuit model of the rotor part, so that the synchronous phase modulator operates in a no-load state;
and 4.4, increasing or reducing the excitation current, so that the two-dimensional finite element model of the synchronous phase modulator operates in an overexcited state or an underexcited state.
Preferably, the first and second electrodes are formed of a metal,
in step 4.1, the process is carried out,
the stator part external circuit model comprises a power grid voltage source model, a stator winding model and a stator winding resistance model;
the rotor part external circuit model comprises an excitation current source model, a rotor winding model and a rotor winding resistance model.
Preferably, the first and second electrodes are formed of a metal,
stator winding model adopts two parallelly connected branch road structures of three-phase, includes: the winding model of the first branch of A phase, the winding model of the second branch of A phase, the winding model of the first branch of B phase, the winding model of the second branch of B phase, the winding model of the first branch of C phase, the winding model of the second branch of C phase;
stator winding resistance model adopts two parallelly connected branch structure of three-phase, includes: the method comprises the following steps of A phase first branch winding resistance model, A phase second branch winding resistance model, B phase first branch winding resistance model, B phase second branch winding resistance model, C phase first branch winding resistance model and C phase second branch winding resistance model;
and the rotor part external circuit model adopts a single-phase single-branch structure.
Preferably, the first and second electrodes are formed of a metal,
in the step 5, the process is carried out,
the adjustment of the short-circuit fault degree is realized by adjusting the number of turns of the short-circuit winding;
the adjustment of the short-circuit fault degree is realized by adjusting the resistance value of the transition resistor;
and the change of the short-circuit fault position is realized by changing the coil position of the short-circuit winding.
Compared with the prior art, the invention has the beneficial effects that:
1. by simplifying the simulation model for processing the large synchronous phase modulator, the calculation speed is increased on the premise of ensuring the electromagnetic field distribution of the synchronous phase modulator.
2. The self structure of the large synchronous phase modulator and the operation difference between the large synchronous phase modulator and the synchronous generator are comprehensively considered, and the synchronous phase modulator model can operate in a phase modulation state.
3. The simulation result of the turn-to-turn short circuit of the stator winding of the synchronous phase modulator obtained by the finite element analysis method can be used as a data base for state monitoring and fault diagnosis of the phase modulator.
Drawings
FIG. 1 is a flow chart of a finite element simulation method of turn-to-turn short circuit of stator windings of a synchronous phase modulator of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the stator winding of the synchronous phase modulator in the finite element simulation method of the turn-to-turn short circuit of the stator winding of the synchronous phase modulator of the present invention;
FIG. 3 is a schematic diagram of the internal structure of the rotor winding of the synchronous phase modulator in the finite element simulation method of the turn-to-turn short circuit of the stator winding of the synchronous phase modulator of the present invention;
FIG. 4 is a simulation model diagram of a simplified integral synchronous phase modulator with the finite element simulation method for stator winding turn-to-turn short circuit of the synchronous phase modulator of the present invention;
FIG. 5 is a schematic gridding diagram of a two-dimensional finite element model of a synchronous phase modulator in the finite element simulation method of the stator winding turn-to-turn short circuit of the synchronous phase modulator of the present invention;
FIG. 6 is a circuit diagram of a partial external circuit model of a stator in a finite element simulation method of turn-to-turn short circuit of a stator winding of a synchronous phase modulator according to the present invention;
FIG. 7 is a circuit diagram of a partial external circuit model of a rotor of the finite element simulation method for stator winding turn-to-turn short circuit of synchronous phase modulator of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Referring to fig. 1, the finite element simulation method for the turn-to-turn short circuit of the stator winding of the synchronous phase modulator comprises the following steps:
step 1, collecting operating parameters, structural data and material data of a synchronous phase modulator.
In particular, the amount of the solvent to be used,
in the step 1, the process is carried out,
the operating parameters include: rated voltage, rated current, rated exciting current, rated capacity, maximum phase advance capability, rotating speed and loss; in the preferred embodiment, the rated capacity of the synchronous phase modulator is 300 Mvar.
The structure data includes: the number of stator branches, the number of stator slots, the number of rotor slots, the outer diameter of a stator core, the inner diameter of the stator core, the length of the stator core, an air gap, the number of rotor slots, the outer diameter of a rotor, the number of turns per slot of the rotor and the number of turns per slot of the stator.
The material data includes: and the magnetic conductivity, the electric conductivity, the heat conductivity coefficient and the specific heat capacity of the rotor core and the stator core.
And 2, based on the structural data and the material data of the synchronous phase modulator, respectively converting a plurality of conductors in the stator winding coil into a stator winding coil conductor and a plurality of conductors in the rotor winding coil into a rotor winding coil conductor by using an equivalent area conversion method, building a two-dimensional finite element model of the synchronous phase modulator, and determining the material attribute, the boundary condition, the simulation area and the motion area of the rotor of the two-dimensional finite element model.
In particular, the amount of the solvent to be used,
the step 2 comprises the following steps:
step 2.1, calculating the conductive sectional areas of a plurality of solid conductors and a plurality of hollow conductors which are connected in parallel in the stator winding coil based on the structural data of the synchronous phase modulator, and converting the conductive sectional areas into a stator winding coil conductor by using an equivalent area conversion algorithm; calculating the conductive sectional areas of a plurality of hollow conductors connected in parallel in the rotor winding coil, and converting the conductive sectional areas into a rotor winding coil conductor by using an equivalent area conversion method;
in the preferred embodiment, as shown in fig. 2, the stator winding coil is single turn, each bar comprises 6 hollow copper wires 6 and 24 solid copper wires 7 connected in parallel, and the conductor is converted into a stator winding coil conductor by using an equivalent area conversion algorithm.
In the preferred embodiment, shown in fig. 3, the rotor winding coil has 12 turns, and each bar comprises 1 hollow copper wire, which is reduced to one rotor winding coil conductor by using an equivalent area reduction algorithm.
Step 2.2, building a two-dimensional finite element model of the synchronous phase modulator;
step 2.3, setting material attributes of the two-dimensional finite element model based on the material data of the synchronous phase modulator;
and 2.4, determining the boundary condition, the simulation area and the motion area of the rotor.
In particular, the amount of the solvent to be used,
in step 2.2, as shown in fig. 4, the two-dimensional finite element model of the synchronous phase modulator comprises: stator core model 1, rotor core model 2, stator winding model 3, rotor winding model 4. The preferred embodiment targets as simulation studies the short circuit fault occurring at fault location 5 in the two-dimensional finite element model of the synchronous phase modulator.
In particular, the amount of the solvent to be used,
in step 2.4, the process is carried out,
the boundary condition is the stator core model outer circumference;
the simulation areas are all areas within the outer circumference of the stator core model;
the rotor movement area is the area between the outer diameter of the rotor core pattern and the inner diameter of the stator core pattern.
And 3, carrying out mesh division on the two-dimensional finite element model, and setting solver parameters.
In particular, the amount of the solvent to be used,
the step 3 comprises the following steps:
step 3.1, carrying out grid division on a two-dimensional finite element model of the synchronous phase modulator, wherein the grid density of the stator winding model and the rotor winding model is greater than that of the stator core model and the rotor core model;
in the preferred embodiment, the mesh division of the model is performed according to the schematic mesh division diagram of the model shown in fig. 5, and it can be seen from the diagram that, compared with the stator core model and the rotor core model, the number of meshes in the unit area of the stator winding model and the rotor winding model is large, so that the stator winding model and the rotor winding model adopt high-density meshes, and the meshes of the stator core model and the rotor core model adopt low-density meshes; when the ANSYS finite element analysis method is adopted, the division of different grid densities is realized by setting grid density parameters.
It is noted that, those skilled in the art can determine the grid density parameter, i.e. the number of grids in the unit area of the model, according to the actual application requirements of the engineering.
And 3.2, setting parameters of a solver, namely setting solving time and step length. In the preferred embodiment, the solution time is set to 7s, and the step size is set to 1 ms.
And 4, building an external stator circuit model and an external rotor circuit model of the synchronous phase modulator, realizing that a three-phase winding is connected to a three-phase power supply to simulate the grid-connected operation of the synchronous phase modulator, and realizing that the two-dimensional finite element model of the synchronous phase modulator operates in a phase modulator state by adjusting exciting current.
In particular, the amount of the solvent to be used,
step 4 comprises the following steps:
and 4.1, building a stator part external circuit model and a rotor part external circuit model based on the actual connection mode of the windings of the synchronous phase modulator.
In particular, the amount of the solvent to be used,
in step 4.1, the process is carried out,
the stator part external circuit model comprises a power grid voltage source model, a stator winding model and a stator winding resistance model;
the rotor part external circuit model comprises an excitation current source model, a rotor winding model and a rotor winding resistance model.
In particular, the amount of the solvent to be used,
stator winding model adopts two parallelly connected branch road structures of three-phase, includes: the winding model of the first branch of A phase, the winding model of the second branch of A phase, the winding model of the first branch of B phase, the winding model of the second branch of B phase, the winding model of the first branch of C phase, the winding model of the second branch of C phase;
stator winding resistance model adopts two parallelly connected branch structure of three-phase, includes: the device comprises an A-phase first branch winding resistance model, an A-phase second branch winding resistance model, a B-phase first branch winding resistance model, a B-phase second branch winding resistance model, a C-phase first branch winding resistance model and a C-phase second branch winding resistance model.
In the preferred embodiment, as shown in fig. 6, the external circuit model of the stator portion includes: a-phase power grid voltage source model UAB-phase power grid voltage source model UBC-phase power grid voltage source model UCThe winding model comprises an A-phase first branch winding model WindigA 1, an A-phase second branch winding model WindigA 2, a B-phase first branch winding model WindigB 1, a B-phase second branch winding model WindigB 2, a C-phase first branch winding model WindigC 1, a C-phase second branch winding model WindigC 2, an A-phase first branch winding resistance model RA1, an A-phase second branch winding resistance model RA2, a B-phase first branch winding resistance model RB1, a B-phase second branch winding resistance model RB2, a C-phase first branch winding resistance model RC1 and a C-phase second branch winding resistance model RC 2.
And the rotor part external circuit model adopts a single-phase single-branch structure.
In the preferred embodiment, as shown in FIG. 7, the rotor shaftThe sub-part external circuit model comprises an excitation current source model, a rotor winding model WindigR and a rotor winding resistance model R. Wherein the exciting current IfThe size can be adjusted.
Step 4.2, the three-phase winding of the synchronous phase modulator is connected to a three-phase power supply by utilizing a circuit model outside the stator part so as to simulate the grid-connected operation state of the synchronous phase modulator;
4.3, setting exciting current by using a partial external circuit model of the rotor part, so that the synchronous phase modulator operates in a no-load state;
and 4.4, increasing or reducing the excitation current, so that the two-dimensional finite element model of the synchronous phase modulator operates in an overexcited state or an underexcited state.
In the preferred embodiment, in order to enable the motor to reach the operating state of the phase modulator, firstly, a three-phase winding of the synchronous phase modulator is connected to a three-phase power supply by utilizing a circuit model outside a stator part so as to simulate the grid-connected operating state of the synchronous phase modulator; then adjusting the exciting current IfThe phase modulator is enabled to operate in a no-load state, and the reactive power of the motor is 0 at the moment; finally, the excitation current I is regulatedfThe motor is enabled to operate in an underexcitation state or an overexcitation state, namely the motor absorbs or emits required reactive power, and at the moment, the motor realizes a synchronous phase modulation operation state.
And 5, for the external circuit model of the stator part, dividing the winding model of the fault branch on the fault phase into a healthy winding model and a short-circuit winding model, and connecting the short-circuit winding model in parallel with the transition resistance model and then in series with the healthy winding model and the winding resistance model.
In the preferred embodiment, as shown in fig. 6, the a-phase first parallel branch is considered to have a short-circuit fault, and therefore the a-phase first branch includes: the winding model comprises an A-phase first branch healthy winding model WindingA1, an A-phase first branch winding resistance model RA1, an A-phase first branch Short-circuit winding model Short WindingA1, an A-phase first branch Short-circuit winding resistance model Short RA1, and the A-phase first branch Short-circuit winding model Short WindingA1 and a transition resistance model r which are connected in parallel.
In particular, the amount of the solvent to be used,
in the step 5, the process is carried out,
the adjustment of the short-circuit fault degree is realized by adjusting the number of turns of the short-circuit winding;
the adjustment of the short-circuit fault degree is realized by adjusting the resistance value of the transition resistor;
and the change of the short-circuit fault position is realized by changing the coil position of the short-circuit winding.
In the preferred embodiment, the short-circuit fault degree satisfies the following relation:
in the formula (I), the compound is shown in the specification,
i denotes the normal current of the non-faulted branch of the non-faulted phase,
Idindicating the short circuit current of the failed phase leg.
Referring to fig. 6, adjusting the number of turns of the a-phase first branch Short-circuited winding model Short WindingA1 can adjust the degree of Short-circuit fault. Since the a-phase first branch winding resistance model RA1 and the a-phase first branch Short-circuit winding resistance model Short RA1 are resistances corresponding to the a-phase first branch healthy winding model WindingA1 and the a-phase first branch Short-circuit winding model Short WindingA1, respectively, when the number of turns of the a-phase first branch Short-circuit winding model Short WindingA1 is adjusted, the resistances of the a-phase first branch winding resistance model RA1 and the a-phase first branch Short-circuit winding resistance model Short RA1 need to be changed.
By combining fig. 6, the resistance value of the transition resistance model r is adjusted, and the simulation of the non-metallic short-circuit fault with different fault degrees can be realized.
Referring to fig. 4, in the stator winding pattern 3, the position of the a-phase first branch Short-circuited winding pattern Short winginga 1 is changed, so that the Short-circuit fault position can be changed.
And 6, calculating short-circuit currents of different fault degrees between turns of the stator winding of the synchronous rectification camera at different fault positions based on a finite element simulation method.
Compared with the prior art, the invention has the beneficial effects that:
1. by simplifying the simulation model for processing the large synchronous phase modulator, the calculation speed is increased on the premise of ensuring the electromagnetic field distribution of the synchronous phase modulator.
2. The self structure of the large synchronous phase modulator and the operation difference between the large synchronous phase modulator and the synchronous generator are comprehensively considered, and the synchronous phase modulator model can operate in a phase modulation state.
3. The simulation result of the turn-to-turn short circuit of the stator winding of the synchronous phase modulator obtained by the finite element analysis method can be used as a data base for state monitoring and fault diagnosis of the phase modulator.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. A finite element simulation method for turn-to-turn short circuit of stator winding of synchronous phase modulator is characterized in that,
the finite element simulation method for the turn-to-turn short circuit of the stator winding of the synchronous phase modulator comprises the following steps of:
step 1, collecting operating parameters, structural data and material data of a synchronous phase modulator;
step 2, based on the structural data and the material data of the synchronous phase modulator, respectively converting a plurality of conductors in a stator winding coil into a stator winding coil conductor and a plurality of conductors in a rotor winding coil into a rotor winding coil conductor by using an equivalent area conversion method, building a two-dimensional finite element model of the synchronous phase modulator, and determining the material attribute, the boundary condition, the simulation area and the motion area of the rotor of the two-dimensional finite element model;
step 3, carrying out mesh division on the two-dimensional finite element model, and setting solver parameters;
step 4, building an external stator circuit model and an external rotor circuit model of the synchronous phase modulator, realizing that a three-phase winding is connected to a three-phase power supply to simulate the grid-connected operation of the synchronous phase modulator, and realizing that a two-dimensional finite element model of the synchronous phase modulator operates in a phase modulator state by adjusting exciting current;
step 5, for the external circuit model of the stator part, dividing the winding model of the fault branch on the fault phase into a healthy winding model and a short-circuit winding model, and connecting the short-circuit winding model in parallel with the transition resistance model and then connecting the short-circuit winding model in series with the healthy winding model and the winding resistance model;
and 6, calculating short-circuit currents of different fault degrees between turns of the stator winding of the synchronous rectification camera at different fault positions based on a finite element simulation method.
2. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 1,
in the step 1, the process is carried out,
the operating parameters include: rated voltage, rated current, rated exciting current, rated capacity, maximum phase advance capability, rotating speed and loss;
the structural data includes: the number of stator branches, the number of stator slots, the number of rotor slots, the outer diameter of a stator core, the inner diameter of the stator core, the length of the stator core, an air gap, the number of rotor slots, the outer diameter of a rotor, the number of turns of each rotor slot and the number of turns of each stator slot;
the material data includes: and the magnetic conductivity, the electric conductivity, the heat conductivity coefficient and the specific heat capacity of the rotor core and the stator core.
3. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 1,
the step 2 comprises the following steps:
step 2.1, calculating the conductive sectional areas of a plurality of solid conductors and a plurality of hollow conductors which are connected in parallel in the stator winding coil based on the structural data of the synchronous phase modulator, and converting the conductive sectional areas into a stator winding coil conductor by using an equivalent area conversion algorithm; calculating the conductive sectional areas of a plurality of hollow conductors connected in parallel in the rotor winding coil, and converting the conductive sectional areas into a rotor winding coil conductor by using an equivalent area conversion method;
step 2.2, building a two-dimensional finite element model of the synchronous phase modulator;
step 2.3, setting material attributes of the two-dimensional finite element model based on the material data of the synchronous phase modulator;
and 2.4, determining the boundary condition, the simulation area and the motion area of the rotor.
4. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 3,
in step 2.2, the two-dimensional finite element model of the synchronous phase modulator comprises: stator core model, rotor core model, stator winding model, rotor winding model.
5. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 3,
in step 2.4, the process is carried out,
the boundary condition is the stator core model outer circumference;
the simulation areas are all areas within the outer circumference of the stator core model;
the moving area of the rotor is the area between the outer diameter of the rotor core model and the inner diameter of the stator core model.
6. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 1,
the step 3 comprises the following steps:
step 3.1, carrying out grid division on a two-dimensional finite element model of the synchronous phase modulator, wherein the grid density of the stator winding model and the rotor winding model is greater than that of the stator core model and the rotor core model;
and 3.2, setting parameters of a solver, namely setting solving time and step length.
7. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 1,
step 4 comprises the following steps:
step 4.1, building a stator part external circuit model and a rotor part external circuit model based on the actual connection mode of the windings of the synchronous phase modulator;
step 4.2, the three-phase winding of the synchronous phase modulator is connected to a three-phase power supply by utilizing a circuit model outside the stator part so as to simulate the grid-connected operation state of the synchronous phase modulator;
4.3, setting exciting current by using a partial external circuit model of the rotor part, so that the synchronous phase modulator operates in a no-load state;
and 4.4, increasing or reducing the excitation current, so that the two-dimensional finite element model of the synchronous phase modulator operates in an overexcited state or an underexcited state.
8. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 7,
in step 4.1, the process is carried out,
the stator part external circuit model comprises a power grid voltage source model, a stator winding model and a stator winding resistance model;
the rotor part external circuit model comprises an excitation current source model, a rotor winding model and a rotor winding resistance model.
9. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 8,
stator winding model adopts two parallelly connected branch road structures of three-phase, includes: the winding model of the first branch of A phase, the winding model of the second branch of A phase, the winding model of the first branch of B phase, the winding model of the second branch of B phase, the winding model of the first branch of C phase, the winding model of the second branch of C phase;
stator winding resistance model adopts two parallelly connected branch road structures of three-phase, includes: the method comprises the following steps of A phase first branch winding resistance model, A phase second branch winding resistance model, B phase first branch winding resistance model, B phase second branch winding resistance model, C phase first branch winding resistance model and C phase second branch winding resistance model;
and the rotor part external circuit model adopts a single-phase single-branch structure.
10. A finite element simulation method of a stator winding turn-to-turn short circuit of a synchronous phase modulator according to claim 1,
in the step 5, the process is carried out,
the adjustment of the short-circuit fault degree is realized by adjusting the number of turns of the short-circuit winding;
the adjustment of the short-circuit fault degree is realized by adjusting the resistance value of the transition resistor;
and the change of the short-circuit fault position is realized by changing the coil position of the short-circuit winding.
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