CN112821846B - Synchronous motor excitation system - Google Patents
Synchronous motor excitation system Download PDFInfo
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- CN112821846B CN112821846B CN202011583191.0A CN202011583191A CN112821846B CN 112821846 B CN112821846 B CN 112821846B CN 202011583191 A CN202011583191 A CN 202011583191A CN 112821846 B CN112821846 B CN 112821846B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/025—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a power interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a synchronous motor excitation system, comprising: the system comprises a redundant PLC, a first intelligent voltage regulator, a second intelligent voltage regulator and a synchronous motor; the first intelligent voltage regulator and the second intelligent voltage regulator are connected in parallel and then connected with the synchronous motor, and both the first intelligent voltage regulator and the second intelligent voltage regulator are connected with the redundant PLC; wherein: the first intelligent voltage regulator is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC; and the redundant PLC is used for starting the second intelligent voltage regulator to work when receiving the fault signal. The invention can improve the stability of the synchronous motor excitation system and avoid the loss of the synchronous motor magnetic field caused by the fault of the voltage regulator.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a synchronous motor excitation system.
Background
At present, a large number of alternating-current exciters are adopted in a synchronous motor, a stator and a rotor of the exciter both adopt three-phase alternating-current windings, and a rotor is provided with a rotating rectifier. The exciter has simple structure, small volume and complete brushless, can provide excitation when being static, and is particularly suitable for static variable frequency starting. However, a disadvantage of this exciter is that the synchronous machine will go out of field and go out of step to a halt when the three-phase power supply is lost or the three-phase thyristor static voltage regulator fails.
Disclosure of Invention
In view of the above problems, the present invention provides a synchronous motor excitation system, which can improve the stability of the synchronous motor excitation system and avoid the loss of field of the synchronous motor caused by the fault of the voltage regulator.
The application provides the following technical scheme through an embodiment:
a synchronous machine excitation system comprising: the system comprises a redundant PLC, a first intelligent voltage regulator, a second intelligent voltage regulator and a synchronous motor; the first intelligent voltage regulator and the second intelligent voltage regulator are connected in parallel and then connected with the synchronous motor, and both the first intelligent voltage regulator and the second intelligent voltage regulator are connected with the redundant PLC; wherein: the first intelligent voltage regulator is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC; and the redundant PLC is used for starting the second intelligent voltage regulator to work when the fault signal is received.
Optionally, the second intelligent voltage regulator includes: the trigger unit is connected with the thyristor;
the redundant PLC is specifically used for generating an enabling signal when the fault signal is received; the current controller is used for generating a first control signal based on the enabling signal; the trigger unit is used for generating a first pulse signal based on the first control signal; the first pulse signal is used for controlling the action of the thyristor so as to enable the second intelligent voltage regulator to work.
Optionally, the second intelligent voltage regulator further includes: the device comprises a reactive power controller, a control mode selection unit and an actual current measurement unit; the reactive power controller is used for receiving the electric quantity measurement parameters sent by the redundant PLC and generating deviation signals according to the electric quantity measurement parameters; the redundant PLC is also used for sending a control mode and an excitation current set value corresponding to the control mode to the second intelligent voltage regulator; the control mode selection unit is used for determining the control mode of the synchronous motor excitation; the actual current measuring unit is used for measuring the actual exciting current of the second intelligent voltage regulator; a current controller for generating a second control signal based on the excitation current set value, the actual excitation current, the deviation signal, and the control manner; the second control signal is a control signal for PID regulation control; the trigger unit is used for generating a second pulse signal based on the second control signal; the second pulse signal is used for controlling the action of the thyristor to adjust the current.
Optionally, the number of the thyristors is 6; the first phase line, the second phase line and the third phase line are respectively provided with two thyristors which are reversely connected in parallel on each phase line.
Optionally, the trigger unit includes a phase shift subunit, a pulse forming subunit, a pulse distributing subunit, and a pulse amplifying subunit; the phase shifting subunit is used for determining a phase shifting angle based on the second control signal; the pulse forming subunit is configured to generate the second pulse signal based on the phase shift angle; the pulse distribution subunit is configured to distribute the second pulse signal to the 6 thyristors; and the pulse amplification subunit is used for amplifying the second pulse information.
Optionally, the control manner determined by the control manner selecting unit includes: power factor control, voltage control, and reactive control.
Optionally, the system further comprises a voltage transformer, a current transformer and an intelligent electric quantity measuring unit; the voltage transformer is used for converting the power supply voltage into a measurement voltage; the current transformer is used for converting the power supply current into the measurement current; the intelligent electric quantity measuring unit is used for obtaining electric measurement parameters based on the measurement voltage and the measurement current; wherein the electrical measurement parameters include active power, reactive power, and power factor of the synchronous machine; the redundant PLC is also used for sending the electrical measurement parameters to the current controller.
Optionally, the intelligent electric quantity measuring unit includes: the intelligent electric quantity measuring device comprises a first intelligent electric quantity measuring unit and a second intelligent electric quantity measuring unit; the redundant PLC includes: an electric quantity selection unit and an output unit; the first intelligent electric quantity measuring unit is used for obtaining a first electric measurement parameter based on the measurement voltage and the measurement current; the second intelligent electric quantity measuring unit is used for obtaining a second electric measurement parameter based on the measurement voltage and the measurement current; the electrical quantity selection unit is used for determining a target parameter from the first electrical measurement parameter and the second electrical measurement parameter; and the output unit is used for sending the target parameter to the second intelligent voltage regulator.
Optionally, the voltage transformer includes: a first voltage transformer and a second voltage transformer; the current transformer includes: a first current transformer and a second current transformer; the first voltage transformer is used for converting the power supply voltage into a first measurement voltage; the first current transformer is used for converting the power supply current into a first measurement current; the first intelligent electric quantity measuring unit is used for obtaining a first electric measurement parameter based on a first measurement voltage and a first measurement current; the second voltage transformer is used for converting the power supply voltage into a second measurement voltage; the second current transformer is used for converting the power supply current into a second measurement current; and the second intelligent electric quantity measuring unit is used for obtaining a second electric measurement parameter based on a second measurement voltage and a second measurement current.
Optionally, the method further includes: and the human-computer interface is used for receiving an input control mode.
The embodiment of the invention provides a synchronous motor excitation system, which comprises: the system comprises a redundant PLC, a first intelligent voltage regulator, a second intelligent voltage regulator and a synchronous motor; the first intelligent voltage regulator and the second intelligent voltage regulator are connected in parallel and then connected with the synchronous motor, and both the first intelligent voltage regulator and the second intelligent voltage regulator are connected with the redundant PLC; wherein: the first intelligent voltage regulator is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC; and the redundant PLC is used for starting the second intelligent voltage regulator to work when receiving the fault signal. Because the invention adopts two independent intelligent voltage regulators, when any one intelligent voltage regulator fails, the other intelligent voltage regulator can be started by the redundant PLC to work, thereby improving the stability of the synchronous motor excitation system and avoiding the loss of field of the synchronous motor caused by the failure of the voltage regulator.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a first step motor excitation system provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of an intelligent voltage regulator according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a trigger unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second step motor excitation system provided by the embodiment of the invention;
fig. 5 shows a schematic structural diagram of a third step motor excitation system provided by the embodiment of the invention.
Icon: 100-synchronous machine excitation system; 11-redundant PLC; 12-an output unit; 13-an electrical quantity selection unit; 14-intelligent electric quantity measuring unit; 141-a first intelligent electric quantity measuring unit; 142-a second smart electricity measuring unit; 21-a first intelligent voltage regulator; 22-a second intelligent voltage regulator; 31-a control mode selection unit; 32-a current controller; 33-a trigger unit; 331-a phase shifting subunit; 332-pulse forming subunit; 333-pulse distribution subunit; 334-a pulse amplification subunit; 34-actual current measuring unit; 35-a thyristor; TV-voltage transformer; TA-current transformer; TV 1-first voltage transformer; TA1 — first current transformer; TV 2-second voltage transformer; TA2 — second current transformer; q1-air switch; q2-high voltage breaker; an SM-synchronous motor; KM-AC contactor.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, a schematic structural diagram of a synchronous machine excitation system 100 according to a first embodiment of the present invention is shown. Synchronous machine exciter system 100 comprising: a redundant PLC (Programmable Logic Controller) 11, a first intelligent voltage regulator 21, a second intelligent voltage regulator 22, and a synchronous motor SM; specifically, the first intelligent voltage regulator 21 and the second intelligent voltage regulator 22 are connected in parallel and then connected to the synchronous motor ac exciter of the synchronous motor SM; first intelligent voltage regulator 21 and second intelligent voltage regulator 22 are connected with synchronous machine SM after parallelly connected, and first intelligent voltage regulator 21 and second intelligent voltage regulator 22 all are connected with redundant PLC11, and synchronous machine SM inserts the electric wire netting through first intelligent voltage regulator 21 and second intelligent voltage regulator 22 to adopt the three-phase electricity power supply. Thus, the first intelligent voltage regulator 21 and the second intelligent voltage regulator 22 can form a redundant excitation system.
The first intelligent voltage regulator 21 and the second intelligent voltage regulator 22 are both intelligent AC/AC voltage regulators (AC/AC voltage regulators), for example, model numbers SIMOTRAS HD. When the system works, the first intelligent voltage regulator 21 is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC 11; and the redundant PLC11 is used for starting the second intelligent voltage regulator 22 to work when receiving the fault signal. The redundant PLC11 can be S7-400H. Specifically, each intelligent voltage regulator all has self fault detection and judgement function, and when the intelligent voltage regulator of work broke down, fault signal accessible ProfiBus DP (a communication bus) sent to redundant PLC11, still can send redundant PLC11 through a hard-wired signal simultaneously, guarantees the reliability of line transmission. At this time, the redundant PLC11 switches on the other intelligent voltage regulator to ensure that the variable three-phase alternating-current power supply of the intelligent voltage regulator is not interrupted and the synchronous motor SM cannot lose excitation and step.
In this implementation, the intelligent voltage regulator may have its own fault detection and judgment function, and not only can judge whether it has a fault, such as whether the thyristor 35 has a fault, whether it is not correctly triggered, and whether the control part has a fault; and whether the three-phase power supply of the intelligent voltage regulator is normal or not, whether the three-phase current is balanced or not can be judged, and the judgment logic can adopt the implementation scheme in the prior art. For example, the intelligent voltage regulator includes various automatic control calculation function blocks, and may be combined to meet different PID (proportional Integral Differential) operations, so as to implement various automatic regulation requirements of excitation, such as excitation control modes of constant excitation current, constant reactive power, constant voltage, constant power factor, and the like, which are not described in detail in this embodiment.
Further, referring to fig. 2, the second intelligent voltage regulator 22 includes: the current controller 32, the trigger unit 33, and the thyristor 35, and the same first intelligent voltage regulator 21 also have the same configuration as the second intelligent voltage regulator 22. The redundant PLC11 is specifically configured to generate an enable signal when receiving the fault signal, where the enable signal may be transmitted to a di (digital input) port of the second intelligent voltage regulator 22 through a DO (digital Output) port, and the Output logic signal may be 1; correspondingly, at this time, the input enable signal of the first intelligent voltage regulator 21 is 0, and it is blocked. A current controller 32 for generating a first control signal based on the enable signal; a trigger unit 33 configured to generate a first pulse signal based on the first control signal; wherein the first pulse signal is used to control the action of the thyristor 35 to operate the second intelligent voltage regulator 22.
After the intelligent voltage regulator is started, specific excitation control is also performed. Thus, the second intelligent voltage regulator 22 in this implementation further comprises: a reactive controller, a control mode selection unit 31 and an actual current measurement unit 34. And the reactive controller is used for receiving the electric quantity measurement parameters sent by the redundant PLC11 and generating deviation signals according to the electric quantity measurement parameters. At this time, the redundant PLC11 is also configured to transmit the excitation control method and the excitation current setting value corresponding to each control method to the second intelligent voltage regulator 22, and can perform communication via the ProfiBus DP. A control mode selection unit 31, configured to determine a control mode for excitation of the synchronous motor SM, where the control mode specifically includes: the control system comprises Power Factor control (PF), voltage control and reactive Power control, wherein parameters corresponding to each control mode can be measured and obtained by a voltage transformer TV and a current transformer TA, and the reactive Power controller can realize the control modes. The actual current measuring unit 34 is configured to measure the actual excitation current of the first intelligent voltage regulator 21, and may measure any two phases of the three phase lines during measurement. Finally, the second control signal is generated by the current controller 32 based on the excitation current set value, the actual excitation current, and the control mode. Specifically, PID regulation control is performed based on an excitation current set value, an actual excitation current, a deviation signal and a corresponding control mode, so that a second control signal is output; then, the triggering unit 33 is configured to generate a second pulse signal based on the second control signal; the second pulse signal is used for controlling the action of the thyristor 35 to adjust the current.
In this embodiment, the number of thyristors 35 is 6, two first phase lines, two second phase lines and two third phase lines are respectively provided, and two thyristors 35 on each phase line are connected in parallel in an inverse manner. Therefore, the intelligent voltage regulator can be started and closed, and the amplitude of the three-phase power can be effectively controlled, so that the normal work of the synchronous motor SM can be ensured. Specifically, the trigger unit 33 includes a phase shift subunit 331, a pulse forming subunit 332, a pulse distributing subunit 333, and a pulse amplifying subunit 334, as shown in fig. 3. A phase shift subunit 331 configured to determine a phase shift angle based on the second control signal; a pulse forming subunit 332, configured to generate a second pulse signal based on the phase shift angle, where the second pulse signal is divided into 6 pulse signals, and the 6 pulse signals correspond to the 6 thyristors 35 respectively; a pulse distributing subunit 333 configured to distribute the second pulse signal to the 6 thyristors 35; and a pulse amplification subunit 334, configured to amplify the second pulse information.
Furthermore, because the intelligent voltage regulator has a user free configuration control function in the implementation, links related to synchronous motor SM excitation control regulation are all placed in the intelligent voltage regulator. Corresponding data may be collected and imported by the redundant PLC11 after the control mode is determined. Specifically, the excitation system 100 of the synchronous machine further includes: a Human Machine Interface (HMI), a voltage transformer TV, a current transformer TA, and an intelligent electricity measuring unit 14; the selection of the control mode by an operator can be received through the man-machine interface, for example, the redundant PLC11 receives the excitation control mode sent through the man-machine interface and the set value signals corresponding to different control modes, and then generates a unique control mode and a set value thereof. In addition, other control signals may also be input to the redundant PLC11 via the human machine interface. A voltage transformer TV for converting a supply voltage into a measurement voltage; the current transformer TA is used for converting the power supply current into measuring current; and the intelligent electric quantity measuring unit 14 is used for obtaining the electric measurement parameters based on the measurement voltage and the measurement current, as shown in figure 1. Wherein the gas measurement parameters comprise active power, reactive power and power factor of the synchronous motor SM; and the redundant PLC11 is also used for sending the electrical measurement parameters to the current controller 32, and the redundant PLC11 can transmit the current real-time measurement quantities of active power, reactive power and power factor and the corresponding set values into the intelligent controller during sending. Thus, the intelligent controller can control the thyristor 35 by any control mode.
For the redundant PLC11, a motor sequence control program and an excitation control program are provided, and the above program logic is well known to those skilled in the art and is not specifically described in the present embodiment. An output unit 12 is provided in the PLC, and the output unit 12 is used for outputting the data collected or obtained by the PLC to the intelligent voltage regulator.
In this implementation, when the ProfiBus DP communication that the intelligent voltage regulator that is working is connected with redundant PLC is interrupted, redundant PLC11 can judge the communication fault through communication module, and control program blocks this intelligent voltage regulator fast through turning the enable signal 0, opens another intelligent voltage regulator enable signal simultaneously, makes its work. Therefore, the three-phase alternating-current power supply with the variable intelligent voltage regulator is not interrupted, the synchronous motor cannot lose magnetism and step, and the communication fault is identified.
In order to ensure the stability of the system, the intelligent electrical quantity measuring unit 14 in the present embodiment includes: a first smart power measuring unit 141 and a second smart power measuring unit 142, as shown in fig. 4. With two intelligent electrical quantity measuring units 14, an electrical quantity selection unit 13 is also provided in the redundant PLC11 at this time. Specifically, the first intelligent electric quantity measuring unit 141 is configured to obtain a first electrical measurement parameter based on the measurement voltage and the measurement current; a second smart electricity measuring unit 142 for obtaining a second electrical measurement parameter based on the measurement voltage and the measurement current; an electrical quantity selection unit 13, configured to determine a target parameter from the first electrical measurement parameter and the second electrical measurement parameter; and an output unit 12 for transmitting the target parameter to the second intelligent voltage regulator 22, so that the current controller 32 can accurately control the thyristor 35 according to real-time data.
Further, since there is still a possibility of circuit failure by using two intelligent electrical quantity measuring units 14, in the present embodiment, independent measuring circuits are designed for the two intelligent electrical quantity measuring units 14 respectively, as shown in fig. 5, as follows:
the voltage transformer TV includes: a first voltage transformer TV1 and a second voltage transformer TV 2; the current transformer TA includes: a first current transformer TA1 and a second current transformer TA 2. At this time, a first voltage transformer TV1 for converting the supply voltage into a first measurement voltage; a first current transformer TA1 for converting a supply current into a first measurement current; a first smart electric quantity measuring unit 141 for obtaining a first electric measurement parameter based on the first measurement voltage and the first measurement current; a second voltage transformer TV2 for converting the supply voltage into a second measurement voltage; a second current transformer TA2 for converting the supply current into a second measurement current; and a second smart electric quantity measuring unit 142 for obtaining a second electric measurement parameter based on the second measurement voltage and the second measurement current. The electrical measurement parameters can be fed into the redundant PLC via the ProfiBus DP, which are independent of one another. In this way, in the redundant PLC11, two electrical measurement parameters can be identified and selected by the electrical quantity selection unit 13, ensuring the accuracy and reliability of the system operation.
It should be further noted that a high-voltage circuit breaker Q2 is arranged on a power supply circuit of the redundancy PLC11 in this embodiment, and an air switch Q1 with a fuse and an alternating current contactor KM are arranged on a circuit of each intelligent voltage regulator, so that safety and reliability of the whole circuit can be guaranteed.
The embodiment realizes full redundancy from signal sampling, excitation regulation control and excitation power conversion units. The loss of the field of the motor caused by the disappearance of one 380V low-voltage power supply can be avoided. Under normal conditions, users often configure a high-Power UPS (Uninterruptible Power Supply, UPS) to solve the magnetic loss fault caused by the disappearance of the 380V low-voltage Power Supply, but the cost is greatly increased. Meanwhile, the thyristor 35 three-phase alternating current/alternating current voltage regulator is chopping voltage regulation, so that a large amount of harmonic waves are generated, the working environment of the UPS is greatly deteriorated, and the reliability of the UPS is low. And the motor loss of magnetism caused by the faults of the three-phase alternating current/alternating current voltage regulator of the thyristor 35 and the motor loss of magnetism caused by an excitation control system can be avoided. Because all algorithms required by excitation control are built in the intelligent alternating current/alternating current voltage regulator adopted in the embodiment, the regulation and control functions of excitation can be independently completed, and the stability of the whole system is ensured.
In summary, the present embodiment provides a synchronous machine excitation system 100, which includes: a redundant PLC11, a first intelligent voltage regulator 21, a second intelligent voltage regulator 22, and a synchronous motor SM; the first intelligent voltage regulator 21 and the second intelligent voltage regulator 22 are connected in parallel and then connected with the synchronous motor SM, and the first intelligent voltage regulator 21 and the second intelligent voltage regulator 22 are both connected with the redundant PLC 11; wherein: the first intelligent voltage regulator 21 is used for stopping working when in fault and sending a fault signal to the redundant PLC 11; and the redundant PLC11 is used for starting the second intelligent voltage regulator 22 to work when receiving the fault signal. Because this implementation has adopted two independent intelligent voltage regulators, can all be started another way intelligent voltage regulator by redundant PLC11 and carry out work when arbitrary way intelligent voltage regulator trouble, improved synchronous machine excitation system 100's stability, the synchronous machine SM that avoids the voltage regulator trouble to arouse loses magnetism.
The term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A synchronous machine excitation system, comprising: the system comprises a redundant PLC, a first intelligent voltage regulator, a second intelligent voltage regulator and a synchronous motor; the first intelligent voltage regulator and the second intelligent voltage regulator are connected in parallel and then connected with the synchronous motor, and both the first intelligent voltage regulator and the second intelligent voltage regulator are connected with the redundant PLC; wherein:
the first intelligent voltage regulator is used for stopping working when a fault occurs and sending a fault signal to the redundant PLC;
the redundant PLC is used for starting the second intelligent voltage regulator to work when the fault signal is received;
the second intelligent voltage regulator comprises: the trigger unit comprises a current controller, a trigger unit and a thyristor;
the redundant PLC is specifically used for generating an enabling signal when the fault signal is received;
the current controller is used for generating a first control signal based on the enabling signal;
the trigger unit is used for generating a first pulse signal based on the first control signal; the first pulse signal is used for controlling the action of the thyristor so as to enable the second intelligent voltage regulator to work;
the second intelligent voltage regulator further comprises: the device comprises a reactive power controller, a control mode selection unit and an actual current measurement unit;
the reactive power controller is used for receiving the electric quantity measurement parameters sent by the redundant PLC and generating deviation signals according to the electric quantity measurement parameters;
the redundant PLC is also used for sending a control mode and an excitation current set value corresponding to the control mode to the second intelligent voltage regulator;
the control mode selection unit is used for determining the control mode of the synchronous motor excitation;
the actual current measuring unit is used for measuring the actual exciting current of the second intelligent voltage regulator;
a current controller for generating a second control signal based on the excitation current set value, the actual excitation current, the deviation signal, and the control manner; the second control signal is a control signal for PID regulation control;
the trigger unit is used for generating a second pulse signal based on the second control signal; the second pulse signal is used for controlling the action of the thyristor to adjust the current.
2. The synchronous machine excitation system of claim 1 wherein there are 6 thyristors; the first phase line, the second phase line and the third phase line are respectively provided with two phase lines, and the two thyristors on each phase line are reversely connected in parallel.
3. The synchronous machine excitation system of claim 2, wherein the trigger unit comprises a phase shift subunit, a pulse forming subunit, a pulse distribution subunit, and a pulse amplification subunit;
the phase shifting subunit is used for determining a phase shifting angle based on the second control signal;
the pulse forming subunit is configured to generate the second pulse signal based on the phase shift angle;
the pulse distribution subunit is configured to distribute the second pulse signal to the 6 thyristors;
and the pulse amplification subunit is used for amplifying the second pulse signal.
4. The synchronous machine excitation system according to claim 1, wherein the control manner determined by the control manner selection unit includes: power factor control, voltage control, and reactive control.
5. The synchronous machine excitation system according to claim 1, further comprising a voltage transformer, a current transformer and an intelligent electric quantity measuring unit;
the voltage transformer is used for converting the power supply voltage into a measurement voltage;
the current transformer is used for converting the power supply current into the measurement current;
the intelligent electric quantity measuring unit is used for obtaining electric measurement parameters based on the measurement voltage and the measurement current; wherein the electrical measurement parameters include active power, reactive power, and power factor of the synchronous machine;
the redundant PLC is also used for sending the electrical measurement parameters to the current controller.
6. The synchronous machine excitation system of claim 5 wherein the intelligent electrical quantity measurement unit comprises: the intelligent electric quantity measuring device comprises a first intelligent electric quantity measuring unit and a second intelligent electric quantity measuring unit; the redundant PLC includes: an electric quantity selection unit and an output unit;
the first intelligent electric quantity measuring unit is used for obtaining a first electric measurement parameter based on the measurement voltage and the measurement current;
the second intelligent electric quantity measuring unit is used for obtaining a second electric measurement parameter based on the measurement voltage and the measurement current;
the electrical quantity selection unit is used for determining a target parameter from the first electrical measurement parameter and the second electrical measurement parameter;
and the output unit is used for sending the target parameter to the second intelligent voltage regulator.
7. The synchronous machine excitation system of claim 6 wherein the voltage transformer comprises: a first voltage transformer and a second voltage transformer; the current transformer includes: a first current transformer and a second current transformer;
the first voltage transformer is used for converting the power supply voltage into a first measurement voltage;
the first current transformer is used for converting the power supply current into a first measurement current;
the first intelligent electric quantity measuring unit is used for obtaining a first electric measurement parameter based on a first measurement voltage and a first measurement current;
the second voltage transformer is used for converting the power supply voltage into a second measurement voltage;
the second current transformer is used for converting the power supply current into a second measurement current;
and the second intelligent electric quantity measuring unit is used for obtaining a second electric measurement parameter based on a second measurement voltage and a second measurement current.
8. The synchronous machine excitation system of claim 1, further comprising: and the human-computer interface is used for receiving an input control mode.
Priority Applications (1)
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