CN110729926A - Brushless synchronous generator model, and modeling method and device of brushless synchronous generator - Google Patents
Brushless synchronous generator model, and modeling method and device of brushless synchronous generator Download PDFInfo
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Abstract
The invention provides a brushless synchronous generator model, a brushless synchronous generator modeling method and a brushless synchronous generator modeling device, wherein the brushless synchronous generator modeling method comprises the following steps: building a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model; establishing a generator model under a dqo coordinate system; establishing an exciter model under a dqo coordinate system; and interconnecting the generator model and the exciter model by using the rectifier and the coupling resistance model to obtain a brushless synchronous generator model. The brushless synchronous generator model, the modeling method and the modeling device of the brushless synchronous generator can effectively solve the problem of model calculation divergence, and have the characteristics of high stability, high real-time performance and high accuracy.
Description
Technical Field
The invention relates to the technical field of modeling of brushless synchronous generators, in particular to a brushless synchronous generator model, and a modeling method and device of a brushless synchronous generator.
Background
With the development and progress of simulation technology, the functions played in system analysis are increasingly important, and meanwhile, the system is increasingly complex, and higher requirements are put forward on a simulation modeling method. In which case, the interconnection of the inductive elements may occur in a complex system, and joint modeling is required.
Currently, a brushless ac generator is actually constructed of two generators, one as an ac exciter and one as a generator, and the exciter and generator are connected by a rotating rectifier. However, both the exciter and the generator in the brushless ac generator are inductive components, and when a model (e.g., a simulink model) is built by using a mathematical principle, both voltages are required to be input, while the mathematical model of the rectifier in the conventional modeling method cannot simultaneously output the voltages on both sides. The exciter model and the generator model cannot be directly connected with the rectifier model at the same time, so that the brushless alternating-current synchronous generator model cannot be built for the generator model, the exciter model and the rectifier model.
In the prior art, in the chinese document "digital simulation of a brushless generator excitation control system for a ship" published as 6 months in 2013, digital modeling of the brushless generator excitation control system uses a simpwoer system toolbox of Matlab/Simulink to perform block modeling on each unit of the system (an exciter and a generator are modeled to select a synchronous motor module, and a rectifier model selects a universal bridge model), and then each unit model built by the simpwoer system toolbox is connected. The modules in the electrical component library have the defects of inflexible parameter setting and model modification, and have the problems of more occupied resources, overtime operation and incapability of successfully downloading when the simulation step length is selected to be smaller in real-time simulation.
In response to the above problems, those skilled in the art have sought solutions.
Disclosure of Invention
In view of this, the invention provides a brushless synchronous generator model, a modeling method and a device of a brushless synchronous generator, which can effectively solve the problem of model calculation divergence and have the characteristics of high stability, high real-time performance and high accuracy.
The invention provides a modeling method of a brushless synchronous generator, which comprises the following steps: building a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model; establishing a generator model under a dqo coordinate system; establishing an exciter model under a dqo coordinate system; and interconnecting the generator model and the exciter model by using the rectifier and the coupling resistance model to obtain a brushless synchronous generator model.
Specifically, the steps of constructing a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model include: the direct current output end of a rectifier in the brushless synchronous generator is connected with a coupling resistor in parallel; building a coupling resistance model according to the coupling resistance; building a rectifier model according to the rectifier; and combining the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model.
Specifically, the step of combining the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model includes: obtaining a current difference corresponding to the coupling resistor in a coupling resistor model and a resistance value of the coupling resistor, and calculating to obtain a first output voltage of the coupling resistor model according to the current difference and the resistance value; feeding the first output voltage back to the rectifier model so that the rectifier model processes according to the first output voltage to obtain a second output voltage; and taking the first output voltage and the second output voltage as two paths of output voltages of the rectifier and the coupling resistor model.
Specifically, the step of interconnecting the generator model and the exciter model by using the rectifier and the coupling resistance model to obtain the brushless synchronous generator model includes: transmitting a first output voltage in the rectifier and coupling resistance model to the generator model; transmitting a second output voltage in the rectifier and coupling resistance model to the exciter model; and interconnecting the generator model, the exciter model and the rectifier model according to the first output voltage and the second output voltage to obtain the brushless synchronous generator model.
Specifically, the step of establishing the generator model under the dqo coordinate system includes: respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation among the voltage, the current and the flux linkage of the generator; establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model; and constructing a simulation model of the generator according to the magnetic linkage state equation so as to obtain the generator model.
Specifically, the step of establishing the exciter model under the dqo coordinate system includes: respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation of the voltage, the current and the flux linkage of the exciter; establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model; and constructing a module according to the flux linkage state equation to form a simulation model of the exciter so as to obtain the exciter model.
The present invention also provides a modeling apparatus of a brushless synchronous generator, the modeling apparatus of the brushless synchronous generator including: a memory for storing executable program code; and a processor for invoking the executable program code in the memory to implement the modeling method of the brushless synchronous generator as described above.
The invention also provides a brushless synchronous generator model, which is a simulation model built by using the modeling method of the brushless synchronous generator.
Specifically, a first excitation voltage end of the exciter model receives a first excitation voltage, a first armature current end of the exciter model delivers an armature current to a second armature current end of the rectifier and coupling resistor model, the first armature line voltage end of the exciter model receives the first armature line voltage output by the second armature line voltage end of the rectifier and coupling resistance model, the first mechanical angular velocity end of the exciter model and the second mechanical angular velocity end of the generator model each receive the same mechanical angular velocity, a first exciting current end of the generator model transmits exciting current to a second exciting current end of the rectifier and coupling resistor model, and a second excitation voltage end of the generator model receives a second excitation voltage sent by a third excitation voltage end of the rectifier and coupling resistor model, and a third armature line voltage end of the generator model receives a second armature line voltage.
Specifically, the rectifier and coupling resistance model includes a rectifier model and a coupling resistance model, a second excitation current end of the coupling resistance model receives an excitation current output by a first excitation current end of the generator model, a first resistance current end of the coupling resistance model receives a resistance current output by the rectifier model, a voltage output end of the coupling resistance model respectively transmits a second excitation voltage to a voltage receiving end of the rectifier model and a second excitation voltage end of the generator model, a second resistance current end of the rectifier receives an armature current output by the first armature current end of the generator model, and a voltage output end of the rectifier model transmits a first armature line voltage to a first armature line voltage end of the generator model.
Specifically, the brushless synchronous generator model, the brushless synchronous generator modeling method and the brushless synchronous generator modeling device provided by this embodiment solve the problem of model calculation divergence by adding the coupling resistance model, and effectively implement interconnection of three models among the generator model, the exciter model and the rectifier model to construct the brushless synchronous generator model, so that the problem of model calculation divergence can be effectively solved, and the brushless synchronous generator model has the characteristics of high stability, high real-time performance and high accuracy.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a second embodiment of the present invention;
FIG. 3 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a third embodiment of the present invention;
FIG. 4 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a fourth embodiment of the present invention;
FIG. 5 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a fifth embodiment of the present invention;
FIG. 6 is a flow chart illustrating a modeling method of a brushless synchronous generator according to a sixth embodiment of the present invention;
fig. 7 is a block diagram showing a modeling apparatus of a brushless synchronous generator according to a seventh embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of a brushless synchronous generator according to an eighth embodiment of the present invention;
fig. 9 is a block diagram showing the structure of a brushless synchronous generator model according to a ninth embodiment of the present invention;
fig. 10 is a block diagram of the rectifier and coupling resistance model of fig. 9.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
Fig. 1 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a first embodiment of the present invention. The present embodiment is a modeling method of a brushless synchronous generator performed by a modeling apparatus of a brushless synchronous generator. As shown in fig. 1, the modeling method of the brushless synchronous generator of the present embodiment may include the steps of:
step S11: and constructing a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model.
Specifically, in the present embodiment, the brushless synchronous generator includes a generator, an exciter, and a rectifier. The field winding of the generator is arranged on the first rotor, and the armature winding of the generator is arranged on the first stator so as to output the electricity generated by the generator. An armature winding of the exciter is provided on the second rotor, and a field winding of the exciter is provided on the second stator. Specifically, in the present embodiment, both the generator and the exciter are connected to the finisher, the armature winding of the exciter is electrically connected to the input terminal of the rectifier, and the field winding of the generator is electrically connected to the output terminal of the finisher. Specifically, the brushless synchronous generator is characterized in that excitation is provided for an excitation winding of an exciter on a second stator, an armature winding of the exciter on a second rotor sends out alternating current, and the alternating current generated by the exciter is rectified by a rectifier and then supplies power to the excitation winding of the generator, so that the armature winding arranged on a first stator of the generator induces and generates required alternating current to transmit the alternating current generated by the generator to a load.
Specifically, in an embodiment, the modeling apparatus of the brushless synchronous generator builds a rectifier model according to a collator in the brushless synchronous generator, and simultaneously virtually develops a coupling resistor on the basis of the brushless synchronous generator, specifically, two ends of the coupling resistor are connected in parallel in the output end of the rectifier, and the modeling apparatus of the brushless synchronous generator builds the coupling resistor model according to the virtual coupling resistor. Specifically, in the present embodiment, the modeling apparatus of the brushless synchronous generator combines the coupling resistance model and the rectifier model to form the rectifier and the coupling resistance model.
Step S12: the generator model is built under the dqo coordinate system.
Specifically, in one embodiment, the modeling device of the brushless synchronous generator builds a generator model in a dqo coordinate system according to the data related to the voltage, current and excitation of the generator.
Step S13: and establishing an exciter model under a dqo coordinate system.
Specifically, in one embodiment, the modeling device of the brushless synchronous generator establishes an excitation generation model in a dqo coordinate system according to the received data related to the voltage, current and excitation of the exciter.
Specifically, in the present embodiment, the generator model and the exciter model are the same mathematical model.
Step S14: and interconnecting the generator model and the exciter model by using a rectifier and a coupling resistor model to obtain the brushless synchronous generator model.
Specifically, in an embodiment, the modeling apparatus of the brushless synchronous generator utilizes two voltages output by the rectifier and the coupling resistor model to transmit a first voltage of the two voltages to the generator model and transmit a second voltage of the two voltages to the exciter model, so as to interconnect the generator model and the exciter model, and thus the generator model, the exciter model and the rectifier model are interconnected to form the brushless synchronous generator model, thereby effectively achieving the technical problem that the generator and the exciter in the brushless synchronous generator are both inductive components for interconnection modeling.
Fig. 2 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a second embodiment of the present invention. The present embodiment is a modeling method of a brushless synchronous generator performed by a modeling apparatus of a brushless synchronous generator. As shown in fig. 1 and fig. 2, the step of constructing a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model according to the modeling method of the brushless synchronous generator of the embodiment includes the following steps:
step S21: the direct current output end of the rectifier in the brushless synchronous generator is connected in parallel with a coupling resistor.
Specifically, in one embodiment, since both the generator and the exciter are inductive components, voltage is required as an input quantity in mathematical modeling. However, a rectifier model obtained by mathematical modeling of a conventional rectifier can only calculate the voltage and current of the other side corresponding to the output rectifier by using the voltage and current input to one side of the rectifier, and the voltages on the two sides of the rectifier model cannot be simultaneously used as the output quantity of the rectifier model. Specifically, in this embodiment, the modeling apparatus of the brushless synchronous generator decouples the dc output terminal of the rectifier and the coupling resistor in parallel during modeling the brushless synchronous generator, so as to prevent the rectifier model and the generator model from being directly connected. Specifically, the power of the coupling resistor virtualized by the modeling apparatus of the brushless synchronous generator is much smaller than the power of the generator when the brushless synchronous generator operates, for example, in an embodiment, the power of the coupling resistor is smaller than one hundredth of the power of the generator.
Step S22: and building a coupling resistance model according to the coupling resistance.
Specifically, in the present embodiment, the modeling apparatus of the brushless synchronous generator builds a coupling resistance model according to the coupling resistance. Specifically, the coupling resistance model takes the output current value in the rectifier model as input, and obtains a voltage value through calculation processing so as to output the voltage value. The coupling resistance model also feeds the obtained voltage value back to the rectifier model to be used as the voltage value of the rectifier model to be input, so that the rectifier model processes according to the received voltage value and outputs a corresponding voltage value.
Step S23: and building a rectifier model according to the rectifier.
Specifically, in the present embodiment, the modeling apparatus of the brushless synchronous generator will build a rectifier model from the rectifiers in the brushless synchronous generator. Specifically, the rectifier model processes the alternating current received from the exciter model to obtain the output direct current. Meanwhile, the corresponding voltage value can be obtained by processing according to the voltage value fed back by the coupling resistance model, and the voltage value is used as the voltage input of the exciter model.
Step S24: and combining the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model.
Specifically, in this embodiment, the modeling apparatus of the brushless synchronous generator is combined with the rectifier model by adding the coupling resistance model to form the rectifier and the coupling resistance model, so that calculation processing can be performed according to current inputs on two sides of the exciter and the generator to obtain two output voltage values, and the two voltage values are correspondingly fed back to the exciter and the generator, thereby realizing interconnection among the generator model, the exciter model and the rectifier model. Specifically, the output of the rectifier is direct-current voltage, and the two output ends of the rectifier are connected with the coupling resistors with large resistance in parallel, so that the rectifier can be almost equivalent to an open circuit, the influence on the output characteristic is small, and the accuracy of the brushless synchronous generator model cannot be reduced.
Referring to fig. 3, fig. 3 is a schematic flow chart of a modeling method of a brushless synchronous generator according to a third embodiment of the invention. As shown in fig. 1 to fig. 3, the step of combining the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model according to the modeling method of the brushless synchronous generator provided in this embodiment includes the following steps:
step S31: and obtaining a current difference corresponding to the coupling resistor in the coupling resistor model and a resistance value of the coupling resistor, and calculating to obtain a first output voltage of the coupling resistor model according to the current difference and the resistance value.
Specifically, in this embodiment, the modeling apparatus of the brushless synchronous generator adopts a common resistance model for the coupling resistor, for example, in an embodiment, the modeling apparatus of the brushless synchronous generator simulates a current-voltage characteristic of the coupling resistor, so as to obtain a coupling resistor model, wherein a voltage value of an output in the coupling resistor model is represented by the following formula:
UR＝(icon-ifd)*R……………………………………………………(1)
wherein, URFor coupling the voltage output by the resistor, iconFor the rectifier to input a current, i, to the coupling resistorfdThe R is a resistance value of the coupling resistor, which is a current output from the coupling resistor to the side of the excitation circuit. Specifically, in the embodiments, the voltage output by the coupling resistor is the first output voltage of the coupling resistor model.
Step S32: and feeding back the first output voltage to the rectifier model so that the rectifier model processes according to the first output voltage to obtain a second output voltage.
Specifically, in the present embodiment, the modeling means of the brushless synchronous generator feeds back the first output voltage output by the coupling resistance model to the rectifier model. Specifically, the finisher model processes the received first output voltage to obtain a second output voltage.
Step S33: and taking the first output voltage and the second output voltage as two paths of output voltages of the rectifier and the coupling resistor model.
Specifically, in the present embodiment, the modeling apparatus of the brushless synchronous generator uses the first output voltage and the second output voltage as two output voltages of the rectifier and the coupling resistor model. Specifically, the rectifier and coupling resistor model transmits the first output voltage to the generator model and transmits the second output voltage to the exciter model, so that the requirement of voltage input of two inductive components such as a generator and an exciter in the brushless synchronous generator is met.
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating a modeling method of a brushless synchronous generator according to a fourth embodiment of the present invention. As shown in fig. 1 to 4, in the modeling method of the brushless synchronous generator according to the present embodiment, the step of interconnecting the generator model and the exciter model by using the rectifier and the coupling resistor model to obtain the brushless synchronous generator model includes the following steps:
step S41: the first output voltage in the rectifier and coupling resistance model is transmitted to the generator model.
Step S42: and transmitting the second output voltage in the rectifier and coupling resistor model to the exciter model.
Specifically, in the present embodiment, the modeling apparatus of the brushless synchronous generator transmits the first output voltage in the rectifier and coupling resistor model to the generator model, and simultaneously transmits the second output voltage in the rectifier model to the exciter model, so as to satisfy the voltage input requirement of two inductive components, such as the generator and the exciter, in the brushless synchronous generator.
Step S43: and interconnecting the generator model, the exciter model and the rectifier model according to the first output voltage and the second output voltage to obtain the brushless synchronous generator model.
Specifically, in this embodiment, the modeling device of the brushless synchronous generator interconnects the generator model, the exciter model and the rectifier model according to the first output voltage and the second output voltage to obtain the brushless synchronous generator model. Specifically, the modeling device of the brushless synchronous generator is combined with the rectifier model by adding the coupling resistance model to form the rectifier and the coupling resistance model, so that calculation processing can be performed according to current input at two sides of the exciter and the generator to obtain two output voltage values, and the two voltage values are correspondingly fed back to the exciter and the generator, so that interconnection among the generator model, the exciter model and the rectifier model is realized. Specifically, the output of the rectifier is direct-current voltage, and the two output ends of the rectifier are connected with the coupling resistors with large resistance in parallel, so that the rectifier can be almost equivalent to an open circuit, the influence on the output characteristic is small, and the accuracy of the brushless synchronous generator model cannot be reduced.
Referring to fig. 5, fig. 5 is a schematic flow chart illustrating a modeling method of a brushless synchronous generator according to a fifth embodiment of the present invention. As shown in fig. 1 and fig. 5, in the modeling method of the brushless synchronous generator according to the present embodiment, the step of establishing the generator model in the dqo coordinate system includes the following steps:
step S51: and respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation among the voltage, the current and the flux linkage of the generator.
Specifically, in one embodiment, the flux linkage is the magnetic flux of a conductive coil or loop linked by a current loop. Specifically, the modeling device of the brushless synchronous generator acquires the voltage, the current and the corresponding flux linkage of the generator, so as to respectively establish a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relationship among the voltage, the current and the flux linkage.
Step S52: and establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model.
Specifically, in an embodiment, the modeling apparatus of the brushless synchronous generator performs equivalent transformation on the current state variable electromagnetic model and the flux linkage state variable electromagnetic model to obtain an equivalent circuit of the generator, and performs coordinate change according to the equivalent circuit of the generator to establish a flux linkage state equation in a dqo coordinate system.
Step S53: and building a module according to the flux linkage state equation to form a simulation model of the generator so as to obtain a generator model.
Specifically, in one embodiment, the modeling device of the brushless synchronous generator constructs a simulation model of the generator according to the flux linkage state equation building module to obtain a generator model.
Specifically, in one embodiment, the modeling device of the brushless synchronous generator builds a generator model as follows:
specifically, a modeling device of the brushless synchronous generator establishes a generator model under a dqo coordinate system, respectively establishes a current state variable-electromagnetic model and a flux linkage state variable-electromagnetic model according to the relation of voltage, current and flux linkage of the generator, processes the current state variable-electromagnetic model and the flux linkage state variable-electromagnetic model to obtain a flux linkage state equation, and then builds a module according to the flux linkage state equation to form a simulation model of the generator.
Specifically, the modeling apparatus of the brushless synchronous generator first performs coordinate change on the equivalent circuit of the generator, and the coordinate change formula of the synchronous generator 3to2(abc-dq) is:
further, under the dqo coordinate system, the modeling device of the brushless synchronous generator processes the current state variable-electromagnetic model and the flux linkage state variable-electromagnetic model to obtain a flux linkage state equation.
Specifically, the flux linkage state equation is:
wherein the content of the first and second substances,
is the flux linkage of the generator, V is the voltage of the generator, i is the current of the generator, omegaRIs the electrical angular velocity of the generator, R is the winding resistance of the generator, L is the winding self-inductance of the generator, LmFor mutual inductance of windings, L, of generatorslThe leakage inductance of the winding of the generator is shown, and P is the pole pair number. Specifically, subscript d is a d-axis component, subscript q is a q-axis component, subscript fd is an excitation component, subscript kd is a damping winding d-axis component, subscript kp is a damping winding q-axis component, and subscript s is a stator data quantity.
It should be noted that the above mathematical model is derived on the basis of considering that the generator includes the damping winding, and when the generator does not have the damping winding, the corresponding voltage and flux linkage equations are removed on the basis of the above mathematical model.
Further, in this embodiment, the modeling apparatus of the brushless synchronous generator selects a flux as a state quantity, and solves a voltage flux equation of the generator by using a fourth-order longge stoke algorithm. Specifically, the voltage flux equation of the generator is expressed according to the formula of the Runge Kutta algorithm:
wherein the content of the first and second substances,
specifically, in one embodiment, to simulate the saturation characteristics of the generator, L in a is usedmdIt is proposed to derive equation (6):
wherein the content of the first and second substances,
specifically, in one embodiment, if the generator model is required to simulate saturation characteristics, the modeling device of the brushless synchronous generator can make the inductance self-inductance LmdThe model is introduced by means of a table look-up.
Further, in one embodiment, to obtain the saturation characteristics of the generator, the no-load characteristics of the synchronous generator need to be analyzed. The rotor exciting winding in the generator is introduced with direct current exciting current, the running working condition when the stator winding in the generator is open-circuit is obtained and is a no-load working condition, the stator current is zero at the moment, and the magnetic field is established only by the rotor exciting current and the exciting magnetomotive force. Specifically, the modeling device of the brushless synchronous generator establishes the exciting current and the flux linkage during the no-load
And VqThe relationship of (1) is:
wherein, VqIs the stator phase voltage peak, ifdsTo convert the excitation current to the stator side.
Further, the modeling device of the brushless synchronous generator is based on VSStator wire voltage effective value and ifdThe actual field current on the rotor. The derivation is performed according to equation (7):
and K is the turn ratio between the excitation winding and the stator winding.
Further, the modeling apparatus of the brushless synchronous generator can obtain the flux linkage according to equations (5) to (8)And inductance LmdThe corresponding relationship of (1). Specifically, the torque may be expressed as:
referring to fig. 6, fig. 6 is a schematic flow chart illustrating a modeling method of a brushless synchronous generator according to a sixth embodiment of the invention. As shown in fig. 1 and fig. 6, in the modeling method of the brushless synchronous generator according to the present embodiment, the step of establishing the exciter model in the dqo coordinate system includes the following steps:
step S61: and respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation of the voltage, the current and the flux linkage of the exciter.
Specifically, in one embodiment, the flux linkage is the magnetic flux of a conductive coil or loop linked by a current loop. Specifically, the modeling device of the brushless synchronous exciter acquires the voltage, the current and the corresponding flux linkage of the exciter, so as to respectively establish a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation of the voltage, the current and the flux linkage.
Step S62: and establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model.
Specifically, in one embodiment, the modeling apparatus of the brushless synchronous exciter performs equivalent transformation on the current state variable electromagnetic model and the flux linkage state variable electromagnetic model to obtain an equivalent circuit of the exciter, and performs coordinate change according to the equivalent circuit of the exciter to establish a flux linkage state equation in a dqo coordinate system.
Step S63: and building a module according to a flux linkage state equation to form a simulation model of the exciter so as to obtain the exciter model.
Specifically, in one embodiment, the modeling unit of the brushless synchronous exciter constructs a simulation model of the exciter according to a flux linkage state equation building module to obtain an exciter model.
Specifically, in the present embodiment, the generator and the exciter in the brushless synchronous generator are both synchronous generators, and the generator and the exciter have the same mathematical model. Specifically, the process of the brushless synchronous generator for constructing the exciter model of the exciter can refer to the description of the embodiment shown in fig. 5, and is not described herein again.
Specifically, the modeling method of the brushless synchronous generator provided by this embodiment is developed through a simulation software mathematical computation library (e.g., matlab/simulink library), and is constructed according to a mathematical principle by using basic computation modules, so that the brushless synchronous generator modeling parameters are conveniently set, each model is flexibly modified, and meanwhile, the method occupies less resources in real-time simulation, can select a smaller simulation step size, and is suitable for various simulation scenarios. Further, in the modeling method of the brushless synchronous generator provided by this embodiment, the coupling resistance model and the rectifier model are built by using the basic calculation module, and the rectifier and the coupling resistance model are obtained by processing the coupling resistance model and the rectifier model; establishing a generator model under a dqo coordinate system; establishing an exciter model under a dqo coordinate system; the generator model and the exciter model are interconnected by utilizing the rectifier and the coupling resistance model to obtain the brushless synchronous generator model, so that the problem of model calculation divergence can be effectively solved, and the brushless synchronous generator model has the characteristics of high stability, high real-time performance and high accuracy. Furthermore, in the modeling method of the brushless synchronous generator provided in this embodiment, after the model is fixed-point processed, for example, the established model is converted into the requirement required by the FPGA board card, so that the operation of the FPGA board card of the real-time simulator can be realized, and the simulation step length of ns level is much higher than the simulation step length of us level of the board card of the CPU processor of the real-time simulator.
Referring to fig. 7, fig. 7 is a block diagram illustrating a modeling apparatus 200 of a brushless synchronous generator according to a seventh embodiment of the present invention. The modeling apparatus 200 of the brushless synchronous generator provided in this embodiment can be used to implement the modeling method of the brushless synchronous generator described above. As shown in fig. 7, the modeling apparatus 200 of the brushless synchronous generator provided in the present embodiment includes a memory 210 and a processor 220.
Specifically, in the present embodiment, the memory 210 is used to store executable program code. The processor 220 is configured to call the executable program code in the memory 210 to implement the steps of modeling the brushless synchronous generator: building a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model; establishing a generator model under a dqo coordinate system; establishing an exciter model under a dqo coordinate system; and interconnecting the generator model and the exciter model by using a rectifier and a coupling resistor model to obtain the brushless synchronous generator model.
Specifically, in an embodiment, the step of constructing the coupling resistance model and the rectifier model and processing the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model by the processor 220 specifically includes: the direct current output end of a rectifier in the brushless synchronous generator is connected with a coupling resistor in parallel; building a coupling resistance model according to the coupling resistance; building a rectifier model according to the rectifier; and combining the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model.
Specifically, in one embodiment, the step of the processor 220 performing the combination process of the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model includes the steps of: obtaining a current difference corresponding to the coupling resistor in the coupling resistor model and a resistance value of the coupling resistor, and calculating to obtain a first output voltage of the coupling resistor model according to the current difference and the resistance value; feeding the first output voltage back to the rectifier model so that the rectifier model processes according to the first output voltage to obtain a second output voltage; and taking the first output voltage and the second output voltage as two paths of output voltages of the rectifier and the coupling resistor model.
Specifically, in an embodiment, the step of the processor 220 interconnecting the generator model and the exciter model by using the rectifier and the coupling resistance model to obtain the brushless synchronous generator model is specifically performed by the steps of: transmitting the first output voltage in the rectifier and coupling resistance model to the generator model; transmitting a second output voltage in the rectifier and coupling resistance model to the exciter model; and interconnecting the generator model, the exciter model and the rectifier model according to the first output voltage and the second output voltage to obtain the brushless synchronous generator model.
Specifically, in one embodiment, the processor 220, performing the step of establishing the generator model in the dqo coordinate system, performs the steps specifically including: respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation among the voltage, the current and the flux linkage of the generator; establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model; and building a module according to the flux linkage state equation to form a simulation model of the generator so as to obtain a generator model.
Specifically, in one embodiment, the step of executing, by the processor 220, the step of establishing the exciter model under the dqo coordinate system is specifically executed by the processor, and the step of executing the step of establishing the exciter model under the dqo coordinate system comprises the steps of: respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation of the voltage, the current and the flux linkage of the exciter; establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model; and building a module according to a flux linkage state equation to form a simulation model of the exciter so as to obtain the exciter model.
Specifically, the modeling apparatus 200 for the brushless synchronous generator provided in this embodiment is developed by using a mathematical computation library (e.g., matlab/simulink library) of simulation software, and is constructed by using basic computation modules according to a mathematical principle, so that parameters for modeling the brushless synchronous generator are conveniently set, each model is flexibly modified, and meanwhile, the occupied resources in real-time simulation are small, a small simulation step length can be selected, and the modeling apparatus is suitable for various simulation scenarios. Further, in the modeling apparatus 200 of the brushless synchronous generator provided in this embodiment, the coupling resistance model and the rectifier model are built by using the basic computing module, and the rectifier and the coupling resistance model are obtained by processing the coupling resistance model and the rectifier model; establishing a generator model under a dqo coordinate system; establishing an exciter model under a dqo coordinate system; the generator model and the exciter model are interconnected by utilizing the rectifier and the coupling resistance model to obtain the brushless synchronous generator model, so that the problem of model calculation divergence can be effectively solved, and the brushless synchronous generator model has the characteristics of high stability, high real-time performance and high accuracy. Furthermore, the modeling apparatus 200 of the brushless synchronous generator provided in this embodiment further converts the established model into the requirement required by the FPGA board card after performing the processes such as the model localization and the like, so as to realize the operation of the FPGA board card of the real-time simulator, thereby achieving the simulation step length of ns level, which is much higher than the simulation step length of us level of the board card of the CPU processor of the real-time simulator.
In this embodiment, please refer to the specific contents described in the embodiments shown in fig. 1 to fig. 6 for the specific process of implementing each function of each functional unit of the modeling apparatus 200 of the brushless synchronous generator, which is not described herein again.
Referring to fig. 8, fig. 8 is a schematic circuit diagram of a brushless synchronous generator 10 according to an eighth embodiment of the present invention. As shown in fig. 8, the brushless synchronous generator 10 includes a generator 11, an exciter 12, and a rectifier 13. Specifically, a field winding of the generator 11 is provided on a first rotor (not shown), and an armature winding of the generator 11 is provided on a first stator (not shown) to output generated electricity into the load 40. The armature winding of the exciter 12 is provided on the second rotor (not shown), and the field winding of the exciter 12 is provided on the second stator (not shown). Specifically, the field winding of the exciter 12 receives the voltage output by the field power supply 20, the output terminal of the armature winding of the exciter 12 is electrically connected to the input terminal of the rectifier 13, the output terminal of the rectifier 13 is electrically connected to the field winding of the generator 11, and the output terminal of the armature winding of the generator 11 is electrically connected to the load 40.
Specifically, by providing excitation to the field winding of the exciter 12 on the second stator, the armature winding of the exciter 12 on the second rotor will emit alternating current and transfer the alternating current into the rectifier 13. The ac power generated by the exciter 12 is rectified and supplied to the field winding of the generator 11 on the first rotor, so that the armature winding of the generator 11 on the first stator induces the required ac power and transmits the ac power to the load 40.
Further, in one embodiment, the brushless synchronous generator 10 may also regulate the output ac power via the voltage regulator 30.
Further, in one embodiment, the brushless synchronous generator 10 further includes a virtual coupling resistor 14 in constructing the mathematical model. Specifically, to realize the mathematical modeling of the brushless synchronous generator 10, it is necessary to establish a generator model, an exciter model, and a rectifier model, respectively, and combine the generator model, the exciter model, and the rectifier model. However, both the generator 11 and the exciter 12 are inductive components, and both voltages are required as input quantities during mathematical modeling, and the rectifier 13 can only calculate the voltage and the current of the other side corresponding to the output rectifier 13 by using the voltage and the current of one side of the input rectifier 13, and cannot simultaneously use the voltage and the current of both sides of the rectifier 13 as output quantities. Therefore, according to the conventional modeling method, the generator 11 and the exciter model cannot be directly connected to the rectifier model at the same time. Specifically, when modeling the brushless synchronous generator 10, a coupling resistor 14 larger than a preset resistance value is connected in parallel to the output end of the rectifier 13 for decoupling, so that the direct connection between the rectifier model and the generator model is avoided.
Specifically, in this embodiment, the modeling apparatus 200 of the brushless synchronous generator is combined with the rectifier model by adding the coupling resistance model to form the rectifier and the coupling resistance model, so that the calculation processing can be performed according to the current input at two sides of the exciter 12 and the generator 11 to obtain two output voltage values, and then the two voltage values are correspondingly fed back to the exciter 12 and the generator 11, thereby realizing the interconnection among the generator model, the exciter model and the rectifier model. Specifically, since the output of the rectifier 13 is a dc voltage, the coupling resistor 14 with a large resistance is connected in parallel to the two output ends of the rectifier, which can be almost equivalent to an open circuit, and has little influence on the output characteristics, and the accuracy of the brushless synchronous generator model is not reduced.
Referring to fig. 9, fig. 9 is a block diagram of a brushless synchronous generator model 100 according to a ninth embodiment of the invention. As shown in fig. 9, the present embodiment provides a brushless synchronous generator model 100 as a simulation model constructed by using the modeling method of the brushless synchronous generator 10 as described above. Specifically, please refer to the description of the embodiment shown in fig. 1 to 6 for the specific construction process of the brushless synchronous generator model 100, which is not described herein again.
Specifically, in one embodiment, the brushless synchronous generator model 100 includes a generator model 110, an exciter model 120, a rectifier and coupling resistance model 130. The first excitation voltage terminal Vfd _ lici of the exciter model 120 receives the first excitation voltage, the first armature current terminal Is _ lici of the exciter model 120 transmits the armature current to the second armature current terminal Is _ lici of the rectifier and coupling resistance model 130, the first armature line voltage terminal Ua _ lici of the exciter model 120 receives the first armature line voltage output from the second armature line voltage terminal Ua _ lici of the rectifier and coupling resistance model 130, the first mechanical angular velocity terminal wm _ lici of the exciter model 120 and the second mechanical angular velocity terminal wm _ zf of the generator model 110 both receive the same mechanical angular velocity wm, the first excitation current terminal Ifd _ zf of the generator model 110 transmits the excitation current to the second excitation current terminal Ifd of the rectifier and coupling resistance model 130, the second excitation voltage terminal Vfd _ zf of the generator model 110 receives the second excitation voltage transmitted from the third excitation voltage terminal Vfd _ zf of the rectifier and coupling resistance model 130, the third armature line voltage end Ua _ zf of the generator model 110 receives the second armature line voltage. Specifically, in one embodiment, the armature current terminal Is _ zf in the generator model 110 Is reserved, and the field current terminal Ifd _ lici in the field machine model 120 Is reserved.
Referring to fig. 10, fig. 10 is a block diagram illustrating a structure of the rectifier and coupling resistor model 130 in fig. 9. As shown in fig. 9 and 10, in the present embodiment, the rectifier and coupling resistance model 130 includes a rectifier model 132 and a coupling resistance model 134, the second excitation current end Icn of the coupling resistance model 134 receives the excitation current output from the first excitation current end Id of the generator model 110, the first resistance current end of the coupling resistance model 134 receives the resistance current output from the rectifier model 132, the voltage output end Ufd of the coupling resistance model 134 respectively transmits the second excitation voltage to the voltage receiving end Ud of the rectifier model 132 and the second excitation voltage end Vfd _ zf of the generator model 110, the second resistance current end of the rectifier 13 receives the armature current output from the first armature current end Is _ lici of the exciter model 120, and the voltage output end Ucon of the rectifier model 132 transmits the first armature line voltage to the first armature line voltage end Ua _ lici of the exciter model 120.
Specifically, the brushless synchronous generator model, the brushless synchronous generator modeling method and the brushless synchronous generator modeling device provided by this embodiment solve the problem of model calculation divergence by adding the coupling resistance model, and effectively implement interconnection of three models among the generator model, the exciter model and the rectifier model to construct the brushless synchronous generator model, so that the problem of model calculation divergence can be effectively solved, and the brushless synchronous generator model has the characteristics of high stability, high real-time performance and high accuracy.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, in which computer-executable instructions are stored, where the computer-readable storage medium is, for example, a non-volatile memory such as an optical disc, a hard disc, or a flash memory. The computer-executable instructions are used to make a computer or similar computing device perform various operations in the modeling method of the brushless synchronous generator.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the terminal class embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant points, reference may be made to part of the description of the method embodiment.
Claims (10)
1. A modeling method of a brushless synchronous generator, the modeling method of the brushless synchronous generator comprising:
building a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model;
establishing a generator model under a dqo coordinate system;
establishing an exciter model under a dqo coordinate system;
and interconnecting the generator model and the exciter model by using the rectifier and the coupling resistance model to obtain a brushless synchronous generator model.
2. The method for modeling a brushless synchronous generator according to claim 1, wherein the step of building a coupling resistance model and a rectifier model, and processing the coupling resistance model and the rectifier model to obtain a rectifier and a coupling resistance model comprises:
the direct current output end of a rectifier in the brushless synchronous generator is connected with a coupling resistor in parallel;
building a coupling resistance model according to the coupling resistance;
building a rectifier model according to the rectifier;
and combining the coupling resistance model and the rectifier model to obtain the rectifier and the coupling resistance model.
3. The method of modeling a brushless synchronous generator as defined in claim 2 wherein the step of combining the coupling resistance model with the rectifier model to obtain the rectifier and coupling resistance model comprises:
obtaining a current difference corresponding to the coupling resistor in a coupling resistor model and a resistance value of the coupling resistor, and calculating to obtain a first output voltage of the coupling resistor model according to the current difference and the resistance value;
feeding the first output voltage back to the rectifier model so that the rectifier model processes according to the first output voltage to obtain a second output voltage;
and taking the first output voltage and the second output voltage as two paths of output voltages of the rectifier and the coupling resistor model.
4. The method of claim 3, wherein the step of interconnecting the generator model and the exciter model using the rectifier and coupling resistance model to obtain the brushless synchronous generator model comprises:
transmitting a first output voltage in the rectifier and coupling resistance model to the generator model;
transmitting a second output voltage in the rectifier and coupling resistance model to the exciter model;
and interconnecting the generator model, the exciter model and the rectifier model according to the first output voltage and the second output voltage to obtain the brushless synchronous generator model.
5. A method of modelling a brushless synchronous generator as claimed in claim 1 wherein the step of establishing a generator model in a dqo coordinate system comprises:
respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation among the voltage, the current and the flux linkage of the generator;
establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model;
and constructing a simulation model of the generator according to the magnetic linkage state equation so as to obtain the generator model.
6. The method of modeling a brushless synchronous generator according to claim 1, wherein the step of establishing the exciter model in the dqo coordinate system comprises:
respectively establishing a current state variable electromagnetic model and a flux linkage state variable electromagnetic model according to the relation of the voltage, the current and the flux linkage of the exciter;
establishing a flux linkage state equation under a dqo coordinate system according to the current state variable electromagnetic model and the flux linkage state variable electromagnetic model;
and constructing a module according to the flux linkage state equation to form a simulation model of the exciter so as to obtain the exciter model.
7. A modeling apparatus of a brushless synchronous generator, characterized by comprising:
a memory for storing executable program code; and
a processor for invoking said executable program code in said memory to implement a modeling method of a brushless synchronous generator as claimed in any one of claims 1 to 6.
8. A brushless synchronous generator model, characterized in that the brushless synchronous generator model is a simulation model constructed by using the modeling method of a brushless synchronous generator according to any one of claims 1 to 6.
9. The model of claim 8, wherein the first excitation voltage end of the exciter model receives a first excitation voltage, the first armature current end of the exciter model transmits an armature current to the second armature current end of the rectifier and coupling resistor model, the first armature line voltage end of the exciter model receives a first armature line voltage output by the second armature line voltage end of the rectifier and coupling resistor model, the first mechanical angular velocity end of the exciter model and the second mechanical angular velocity end of the generator model both receive the same mechanical angular velocity, the first excitation current end of the generator model transmits an excitation current to the second excitation current end of the rectifier and coupling resistor model, the second excitation voltage end of the generator model receives a second excitation voltage transmitted by the third excitation voltage end of the rectifier and coupling resistor model, a third armature line voltage end of the generator model receives a second armature line voltage.
10. The brushless synchronous generator model of claim 9, wherein the rectifier and coupling resistance model comprises a rectifier model and a coupling resistance model, the second excitation current end of the coupling resistance model receives the excitation current output by the first excitation current end of the generator model, a first resistance current terminal of the coupled resistance model receives the resistance current output by the rectifier model, the voltage output end of the coupling resistance model respectively transmits a second excitation voltage to the voltage receiving end of the rectifier model and the second excitation voltage end of the generator model, the second resistance current end of the rectifier receives the armature current output by the first armature current end of the exciter model, the voltage output end of the rectifier model transmits a first armature line voltage to a first armature line voltage end of the exciter model.
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