CN106385212B - Control device for connecting induction generator to isolated asymmetric load - Google Patents
Control device for connecting induction generator to isolated asymmetric load Download PDFInfo
- Publication number
- CN106385212B CN106385212B CN201610879075.0A CN201610879075A CN106385212B CN 106385212 B CN106385212 B CN 106385212B CN 201610879075 A CN201610879075 A CN 201610879075A CN 106385212 B CN106385212 B CN 106385212B
- Authority
- CN
- China
- Prior art keywords
- voltage
- stator
- rotor
- axis
- sequence
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/007—Control circuits for doubly fed generators
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The application discloses a control device for connecting a double-fed induction generator with an isolated asymmetric load, which comprises a diesel engine, the double-fed induction generator, a position sensor, a diesel engine speed controller and a double-fed induction generator controller; wherein doubly-fed induction generator controller includes: the system comprises a main control board, a stator side converter power loop, a rotor side converter power loop, a stator side filter capacitor, a stator side filter reactor, a direct current chain supporting capacitor, a direct current side absorption capacitor, a starting direct current power supply, a current sensor and a voltage sensor. The application enables the double-fed induction generator to effectively eliminate the negative sequence and the zero sequence voltage of the stator when connected with the isolated asymmetric load at different running rotating speeds, keeps the frequency and the amplitude of the stator voltage constant, can quickly recover and stabilize the stator voltage when the load suddenly changes, has good performance of adapting to the change of the load, and is particularly suitable for the control field of the double-fed induction generator connected with the isolated asymmetric load.
Description
Technical Field
The application relates to the field of communication, in particular to a control device for connecting an induction generator to an isolated asymmetric load.
Background
The generator set which operates in isolation is widely used as a mobile power supply in troops, construction sites, mountainous areas, rural areas, forest farms and the like, is used as a standby emergency power supply in houses, shops and hospitals, is isolated and generally refers to a load which is not connected with a power grid, and is realized by mainly adopting a diesel engine as a prime mover to drive a synchronous generator at present. With the development of society, the original generator set which operates in an isolated mode is heavy, high in oil consumption, high in noise and serious in tail gas pollution, is not suitable for the needs of the society, and the generator set is developed towards the direction of energy conservation, environmental protection, light weight and miniaturization in the future. The existing diesel generator set products in China have long been mature in cost advantage and technology, the export situation is continuously good, and especially the demand of the middle east, Africa, Australia and other areas on the diesel generator set in China is steadily increased.
The original generator set which is operated in an isolated mode mainly adopts a synchronous generator, the synchronous generator ensures the constancy of the output voltage frequency, and the rotating speed of the generator can only operate at the synchronous speed corresponding to the voltage frequency along with the change of the load size, so that the oil engine cannot operate in a high-efficiency area, and the fuel consumption is increased.
Generally, the load of the generator set in isolated operation is an asymmetric load, such as a single-phase load (such as a single-phase air conditioner, an elevator, a single-phase power supply device and the like), the generator is in an asymmetric operation state, the asymmetry of the output voltage cannot be eliminated by a control means when a synchronous generator is adopted, and the asymmetry of the output voltage can only be weakened by structural design modes such as additionally arranging a damping winding and the like, so that the output voltage waveform of the generator set can generate certain distortion, and meanwhile, when the load suddenly changes, the excitation regulation response of the synchronous generator is slow, and the amplitude of the output voltage can obviously change.
Disclosure of Invention
The application provides a control device for connecting an induction generator with an isolated asymmetric load; the stability of the output voltage can be improved when the load suddenly changes.
In a first aspect, there is provided a control apparatus for connecting an induction generator to an isolated asymmetric load, the control apparatus comprising: the system comprises a diesel engine, a double-fed induction generator, a position sensor, a diesel engine speed controller and a double-fed induction generator controller;
the diesel engine and the doubly-fed induction generator are coaxially installed, the position sensor is installed on a rotating shaft of the doubly-fed induction generator, the position sensor is connected with the controller of the doubly-fed induction generator, the controller of the doubly-fed induction generator is connected with the doubly-fed induction generator and controls the output voltage of the doubly-fed induction generator, the speed controller of the diesel engine is connected with the diesel engine and controls the rotating speed of the diesel engine, and the speed controller of the diesel engine is connected with the controller of the doubly-fed induction generator;
the stator three-phase winding port ABC and the rotor three-phase winding port ABC of the doubly-fed induction generator are connected with the controller of the doubly-fed induction generator through cables, and the stator three-phase winding port ABC and the neutral point port N of the doubly-fed induction generator are connected with an isolated asymmetric load through cables;
the stator three-phase winding port ABC and the neutral point port N of the doubly-fed induction generator are connected with an isolated asymmetric load through cables and are used for providing a power supply mode of a single-phase port N and a neutral point port N for the isolated single-phase load when the isolated asymmetric load is an isolated single-phase load; the power supply mode of the single-phase and neutral point port N is that any one phase of the stator three-phase winding port ABC and the neutral point port N simultaneously supply power to the isolated single-phase load;
the double-fed induction generator controller is set to be in a mapping relation between a fixed rotating speed and a power value, the double-fed induction generator controller calculates a power value of an isolated asymmetric load according to line current and line voltage of any phase of a stator three-phase winding port ABC, the double-fed induction generator controller obtains the diesel rotating speed corresponding to the power value of the asymmetric load according to the power value of the isolated asymmetric load from the mapping relation, the double-fed induction generator controller sends the diesel rotating speed to the diesel speed controller, and the diesel rotating speed is used for indicating the diesel speed controller to control the diesel rotating speed.
The control device provided by the first aspect obtains the rotating speed according to the mapping relation between the power and the rotating speed of the diesel engine, so that the control device can adjust the proper rotating speed of the diesel engine according to the power, thereby reducing the oil consumption and saving the energy. The stator three-phase winding port ABC and the neutral point port N of the double-fed induction generator of the device are connected with the isolated asymmetric load through cables, the neutral point port N is added, power supply in an L-N mode of the asymmetric load can be achieved, and connection of the asymmetric load is achieved. In an alternative design, the doubly fed induction generator controller comprises: main control panel, stator side converter power return circuit, rotor side converter power return circuit, stator side filter capacitor, stator side filter reactor, direct current chain support electric capacity, direct current side absorption electric capacity, excitation direct current power supply, current sensor and voltage sensor, wherein:
a stator three-phase winding port ABC of the doubly-fed induction generator controller is connected with a stator side filter capacitor and then is connected with one end of a stator side filter reactor, and the other end of the stator side filter reactor is connected with a stator side converter power loop;
a rotor three-phase winding port abc of the doubly-fed induction generator controller is connected with a power loop of the rotor side converter; a rotor three-phase winding port abc of the doubly-fed induction generator controller is connected with a power loop of the rotor side converter; two ends of the first direct-current chain absorption capacitor are respectively connected with a direct-current chain of the stator side converter power loop, and two ends of the second direct-current chain absorption capacitor are respectively connected with a direct-current chain of the rotor side converter power loop; a first direct current chain supporting capacitor is connected with a second direct current chain supporting capacitor in series and then connected with the first direct current chain absorption capacitor in parallel, a third direct current chain supporting capacitor is connected with a fourth direct current chain supporting capacitor in series and then connected with the second direct current chain absorption capacitor in parallel, and the excitation starting direct current power supply is connected with a direct current chain of the power loop of the rotor side converter in parallel through a diode;
and the main control board is used for sending PWM signals to the stator side converter power loop and the rotor side converter power loop so as to enable the amplitude and the frequency of the voltage at the stator output side of the doubly-fed induction generator to be constant.
The above alternative design provides an implementation of a doubly-fed induction generator controller, supporting a specific implementation of the control arrangement of the first aspect.
In a second aspect, there is provided a method of controlling an induction generator to connect to a control device isolated asymmetric loads, the method comprising:
establishing a steady-state voltage equation of the doubly-fed induction generator oriented by adopting a stator positive sequence voltage vector under a positive sequence synchronous rotating coordinate system; the stator positive sequence voltage vector orientation specifically includes: the d axis coincides with the positive sequence voltage vector position of the stator;
establishing a steady-state voltage equation of the doubly-fed induction generator under a negative sequence synchronous rotating coordinate system by adopting stator negative sequence voltage vector orientation, wherein the stator negative sequence voltage vector orientation comprises the following steps: the d axis coincides with the position of a negative sequence voltage vector of the stator;
detecting positive and negative sequence components of the stator voltage and the rotor current;
calculating d-axis and q-axis current set values of a positive sequence, a negative sequence and a rotor;
and establishing a positive sequence current control equation and a negative sequence current control equation, and controlling the control device in a positive sequence current control mode and a negative sequence current control mode.
When the control device of the second aspect is connected with an isolated asymmetric load, the stator negative sequence voltage can be eliminated for the rotor current through the stator positive sequence voltage vector oriented steady-state voltage equation and the stator negative sequence voltage vector oriented steady-state voltage equation under different operation rotating speeds, the amplitude and the frequency of the stator voltage are kept constant, and the stability of the output voltage when the load suddenly changes is improved.
The method provided by the second aspect realizes control of the control device of the first aspect, so that the control device of the first aspect has the advantages of high stability of output voltage and low energy consumption when the load suddenly changes.
The application provides a controlling means connects when isolated asymmetric load, through the control to the rotor current, under the operation rotational speed of difference, the homoenergetic can eliminate stator negative sequence voltage, keeps the amplitude and the frequency of stator voltage invariable, so it has the advantage that improves output voltage stability when the load sudden change.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural diagram of a control device for connecting an isolated asymmetric load to a doubly-fed induction generator provided by the present application.
Fig. 2 is a block diagram of a doubly fed induction generator controller as used herein.
Fig. 3 is a schematic diagram illustrating a control method for controlling stator voltage amplitude and frequency stability by the doubly-fed induction generator controller according to the present application.
Fig. 4 is a schematic diagram illustrating the principle of separating positive and negative sequences by using the time delay method.
Fig. 5 is a schematic diagram of stator positive sequence voltage control as used herein.
Fig. 6 is a schematic diagram of the negative-sequence voltage control of the stator employed in the present application.
Fig. 7 is a waveform diagram of a stator line voltage, a stator line current and a rotor current when a motor rotates at 1200 rpm with a single-phase load by using the control device of the present application.
Fig. 8 is a waveform diagram of a stator line voltage, a stator line current, and a rotor current when the motor speed is 1200 rpm with a single-phase load when the stator negative sequence voltage control is not performed.
Fig. 9 is a waveform diagram of a stator line voltage, a stator line current and a rotor current when a motor rotates at 2400 rpm with a single-phase load by using the control device of the present application.
Fig. 10 is a waveform diagram of a stator line voltage, a stator line current, and a rotor current when the motor speed is 2400 rpm with a single-phase load when the negative-sequence stator voltage control is not performed.
In the attached figures 7-10, the motor operates with a symmetrical three-phase rated load in the front period of time (0-0.6 s); the load is suddenly changed into a single-phase load in the later period (after 0.6 s);
fig. 11 is a flowchart of a control method of a control device according to another embodiment of the present application.
Detailed Description
Referring to fig. 1, an embodiment of the present application provides a control apparatus for connecting a doubly-fed induction generator to an isolated asymmetric load, where the control apparatus for connecting the doubly-fed induction generator to the isolated asymmetric load includes: the system comprises a diesel engine 11, a doubly-fed induction generator 12, a position sensor 13, a diesel engine speed controller 14 and a doubly-fed induction generator controller 15;
the diesel engine 11 and the doubly-fed induction generator 12 are coaxially installed, a position sensor (specifically, a resolver) 13 is installed on a rotor of the doubly-fed induction generator 12, the position sensor 13 is connected with the doubly-fed induction generator controller 15, and the position sensor 13 acquires a resolver signal and sends the resolver signal to the doubly-fed induction generator controller 15; the double-fed induction generator controller 15 is connected with the double-fed induction generator 12 and controls the output voltage of the double-fed induction generator 12, the diesel engine speed controller 14 is connected with the diesel engine 11 and controls the rotating speed of the diesel engine 11, and the diesel engine 11 speed controller is connected with the double-fed induction generator controller 15;
a stator three-phase winding port ABC and a rotor three-phase winding port ABC of the doubly-fed induction generator 12 are connected with a doubly-fed induction generator controller 15 through cables; a stator three-phase winding port ABC and a neutral point port N of the doubly-fed induction generator 12 are connected with the isolated asymmetric load 18 through cables;
the stator three-phase winding port ABC and the neutral point port N of the doubly-fed induction generator 12 are connected with the isolated asymmetric load 18 through cables and used for providing a power supply mode of the single-phase and neutral point ports N for the isolated single-phase load when the isolated asymmetric load 18 is the isolated single-phase load; the power supply mode of the single-phase and neutral point port N is that any one phase of the stator three-phase winding port ABC and the neutral point port N simultaneously supply power to the isolated single-phase load;
the double-fed induction generator controller 15 is provided with a mapping relation between the rotating speed and the power value of the diesel engine, the double-fed induction generator controller 15 calculates the power value of the isolated asymmetric load 18 according to the line voltage and the line current of any phase of the stator three-phase winding port ABC, the double-fed induction generator controller 15 obtains the rotating speed of the diesel engine corresponding to the power value of the asymmetric load from the mapping relation according to the power value of the isolated asymmetric load 18, the double-fed induction generator controller 15 sends the rotating speed of the diesel engine to the diesel engine speed controller 14, and the rotating speed of the diesel engine is used for indicating the diesel engine speed controller.
The specific calculation method for calculating the power value of the isolated asymmetric load 18 by the controller 15 of the doubly-fed induction generator according to the line voltage and the line current of any phase of the stator three-phase winding port ABC may be as follows:
the isolated asymmetric load 18 has a power value equal to root 3 times the product of the current and line voltage of either phase. According to the technical scheme shown in fig. 1, the rotating speed of the diesel engine is obtained according to the mapping relation between the power and the rotating speed of the diesel engine, so that the rotating speed of the diesel engine can be adjusted according to the power, the oil consumption is reduced, and the energy is saved. The neutral point port N is an output port formed by three-phase windings converged at one point. The stator three-phase winding port ABC and the neutral point port N of the doubly-fed induction generator 12 are connected with the isolated asymmetric load 18 through cables, so that the isolated asymmetric load can be accessed more conveniently, and the specific reason is as follows: for a non-isolated load (i.e. a load entering a power grid), all three phases of ABC are connected with the power grid, and the voltage of the power grid cannot be controlled for the load, while for an isolated asymmetric load, the voltage of each phase fluctuates due to the isolation of the load, and for a single-phase load, such as an electric fan and other equipment, the power supply requirement is an L-N mode, namely a one-way voltage plus a neutral point N voltage, wherein L refers to any phase voltage in the one-way voltage, namely ABC. If ABC has no N point, then for the unidirectional load, it can not realize the L-N mode, so that the addition of the neutral point can realize the access of the isolated unidirectional load.
The mapping relationship between the rotational speed and the power value of the diesel engine may be preset by a user or a manufacturer and stored in the control device, and the obtaining manner of the mapping relationship may be obtained through a test manner, for example, at a certain power value, the rotational speed of the diesel engine is adjusted, a plurality of fuel consumptions corresponding to a plurality of rotational speeds are detected, the rotational speed corresponding to the lowest fuel consumption is selected as the rotational speed of the diesel engine with the power, and of course, in an actual application, the mapping relationship may be obtained in other manners, and the specific establishing or obtaining manner of the mapping relationship is not limited in the present application.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the doubly-fed induction generator controller 15 provided in the present application, wherein the doubly-fed induction generator controller includes: a main control board 20, a stator-side converter power circuit (i.e., a stator-side converter) 21, a rotor-side converter power circuit (a rotor-side converter) 22, a stator-side smoothing capacitor 23, a stator-side smoothing reactor 24, a dc link absorption capacitor 25, a dc-side support capacitor 26, a field-starting dc power supply 27, a current sensor 28, and a voltage sensor 29, wherein:
the stator three-phase winding port ABC of the doubly-fed induction generator controller is connected (the connection mode can be a triangular connection method, and other connection modes can be adopted) with the stator side filter capacitor 23 and then with one end of the stator side filter reactor 24, and the other end of the stator side filter reactor 24 is connected with the stator side converter power loop 21;
a rotor three-phase winding port abc of the doubly-fed induction generator controller 15 is connected with a rotor side converter power loop 22; two ends of the first dc link absorption capacitor 251 are respectively connected to the dc links of the stator-side converter power circuit 21, and two ends of the second dc link absorption capacitor 252 are respectively connected to the dc links of the rotor-side converter power circuit 22; a first direct current chain supporting capacitor 261 is connected with a second direct current chain supporting capacitor 262 in series and then connected with a first direct current chain absorption capacitor 251 in parallel, a third direct current chain supporting capacitor 263 is connected with a fourth direct current chain supporting capacitor 264 in series and then connected with a second direct current chain absorption capacitor 252 in parallel, and an excitation direct current power supply 27 is connected with a direct current chain of the rotor side converter power loop 22 in parallel through a diode; 3 current sensors 28 and 2 voltage sensors 29 are installed at a port ABC of the doubly-fed induction generator controller 15, 2 current sensors 28 are installed at a port ABC of the doubly-fed induction generator controller 15, 1 voltage sensor 29 is installed at a direct current chain of the stator side converter power loop 21, and 2 current sensors 28 are installed between the stator side filter reactor 24 and the stator side converter power loop 21;
the main control board 20 is configured to send a Pulse Width Modulation (PWM) signal to the stator-side converter power loop 21 and the rotor-side converter power loop 22 to make the voltage amplitude and the frequency of the stator output side (i.e., the voltage provided by the isolated load) of the doubly-fed induction generator constant.
In addition, the rotating speed of the control device is obtained according to the mapping relation between power and the rotating speed of the diesel engine, so that the rotating speed of the control device can adjust the proper rotating speed of the diesel engine according to the power, the oil consumption is reduced, and the energy is saved. Compared with waveforms without stator negative sequence voltage control in the attached figures 8 and 10, the stator output voltage has better symmetry, and is beneficial to providing a more stable and better waveform power supply for an isolated asymmetric load. By combining waveforms of loads in the processes of sudden change from symmetrical loads to single-phase loads in the graphs of fig. 7 and 9, the control device provided by the application can effectively eliminate negative sequence voltage of the stator during steady-state operation at different rotating speeds, and the transient process of the control device is in the order of magnitude of ms during sudden change of the loads, so that the voltage of the stator output by the induction generator can be quickly recovered to a set value to keep stable operation, and the control device has good excellent performance of adapting to load change.
The implementation scheme for the doubly-fed induction generator controller to control the stator voltage specifically may include:
a. signal detection
Stator line voltage UAB、UBCAnd a DC link voltage UDCSignal detection: detecting a stator wire voltage signal by using a voltage sensor, processing the stator wire voltage signal by using a conditioning circuit and a filter, and sending the stator wire voltage signal into an AD conversion channel of a controller of the doubly-fed induction generator;
stator phase current IA、IB、IcFilter reactor current IgA、IgBRotor phase current Ia、IcSignal detection: detecting a rotor phase current signal by using a current sensor, processing the rotor phase current signal by using a conditioning circuit and a filter, and sending the rotor phase current signal into an AD conversion channel of a controller of the doubly-fed induction generator;
rotor position angle detection: and the output signal of the position sensor is obtained by utilizing the position sensor arranged on the motor and is sent to a position sensor decoding chip of the controller of the double-fed induction generator, so that the detection of the position angle of the rotor is realized.
b. Calculation of slip and coordinate transformation angle theta
Obtaining the rotation speed omega of the motor by derivation operation by utilizing the rotor position angle obtained by detectionrObtaining synchronous rotation angular frequency omega according to stator voltage frequency to be controlled1Defined by ω according to the slipr、ω1Calculating the slip ratio;
according to the synchronous rotation angular frequency omega1Obtaining a transformation angle required by positive and negative sequence separation of the stator voltage;
according to the synchronous rotation angular frequency omega1And obtaining a transformation angle required by rotor current positive and negative sequence separation by the rotor position angle.
c. Stator positive and negative sequence voltage and rotor positive and negative sequence current separation calculation
And (3) positive and negative sequence separation calculation of the stator voltage: calculating the positive and negative sequence components of the stator voltage according to figure 4 and the positive and negative sequence separation formulas provided in the detection of the positive and negative sequence components of the stator voltage and the rotor current;
and (3) positive and negative sequence separation calculation of rotor current: and (3) calculating the positive-sequence component and the negative-sequence component of the rotor current after replacing the voltage quantity with the current quantity according to a positive-sequence and negative-sequence separation formula provided in the detection of the positive-sequence component and the negative-sequence component of the stator voltage and the rotor current in the attached figure 4.
d. Control algorithm
Positive sequence voltage control algorithm: according to a control block diagram and a formula shown in the attached figure 5, a rotor positive sequence d-axis current control instruction value is obtained by using a stator positive sequence q-axis voltage control loop, a rotor positive sequence q-axis current control instruction value is obtained by using the stator positive sequence d-axis voltage control loop, and a rotor positive sequence dq-axis control voltage value is obtained through a positive sequence voltage control equation;
negative sequence voltage control algorithm: according to a control block diagram and a formula shown in the attached figure 6, a negative sequence d-axis current control instruction value of a rotor is obtained by using a negative sequence q-axis voltage control loop of a stator, a negative sequence q-axis current control instruction value of the rotor is obtained by using a negative sequence d-axis voltage control loop of the stator, and a negative sequence dq-axis control voltage value of the rotor is obtained by using a negative sequence voltage control equation;
calculating the total control voltage value: respectively carrying out dq-abc coordinate transformation on the control voltage values of the positive and negative sequences of the rotor and then adding the control voltage values to obtain a rotor total control voltage value under an abc axis;
and (3) SPWM calculation: and a PWM control signal is obtained through the rotor master control voltage under the abc shaft according to an SPWM modulation mode, so that the control of the rotor side converter is realized.
Another embodiment of the present application provides a control method of a control apparatus provided in an embodiment, where the method is shown in fig. 11, and includes:
step S1101, establishing a stator positive sequence voltage vector oriented steady-state voltage equation of the doubly-fed induction generator in a positive sequence synchronous rotating coordinate system; the stator positive sequence voltage vector orientation specifically includes: the d axis coincides with the positive sequence voltage vector position of the stator;
the implementation method of the step S1101 may specifically be:
usd(p)＝-ω1ψsq(p)＝-ω1(Lsisq(p)+Lmirq(p))＝Us(p)
usq(p)＝ω1ψsd(p)＝ω1(Lsisd(p)+Lmird(p))＝0
urd(p)＝Rrird(p)+sUs(p)
urq(p)＝Rrirq(p)
wherein: u shapes(p)Is the magnitude of the stator positive sequence voltage vector, RrIs a rotor winding phase resistance; l iss、LmThe self inductance of the stator winding and the mutual inductance of the stator and the rotor windings are respectively adopted; omega1Is the synchronous angular frequency; s is the slip of the motor; u. ofsd(p)、usq(p)、urd(p)、urq(p)Respectively are positive stator sequence d-axis voltage, positive stator sequence q-axis voltage, positive rotor sequence d-axis voltage and positive rotor sequence q-axis voltage; i.e. isd(p)、isq(p)、ird(p)、irq(p)The positive sequence d-axis current of the stator, the positive sequence q-axis current of the stator, the positive sequence d-axis current of the rotor and the positive sequence q-axis current of the rotor are respectively; psisd(p)、ψsq(p)The positive sequence of the stator is d-axis magnetic linkage, and the positive sequence of the stator is q-axis magnetic linkage.
Step S1102, establishing a steady-state voltage equation of stator negative sequence voltage vector orientation of the doubly-fed induction generator in a negative sequence synchronous rotating coordinate system, wherein the stator negative sequence voltage vector orientation comprises the following steps: the d axis coincides with the position of a negative sequence voltage vector of the stator;
the implementation method of step S1102 may specifically be:
usd(n)＝ω1ψsq(n)＝ω1(Lsisq(n)+Lmirq(n))＝Us(n)
usq(n)＝-ω1ψsd(n)＝-ω1(Lsisd(n)+Lmird(n))＝0
urd(n)＝Rrird(n)+(2-s)Us(n)
urq(n)＝Rrirq(n)
wherein: u shapes(n)Is the magnitude of the stator negative sequence voltage vector, usd(n)、usq(n)、urd(n)、urq(n)Respectively are stator negative sequence d-axis voltage, stator negative sequence q-axis voltage, rotor negative sequence d-axis voltage and rotor negative sequence q-axis voltage; i.e. isd(n)、isq(n)、ird(n)、irq(n)The negative sequence of the stator is d-axis current, the negative sequence of the stator is q-axis current, the negative sequence of the rotor is d-axis current, and the negative sequence of the rotor is q-axis current; psisd(n)、ψsq(n)The magnetic flux linkage comprises a stator negative sequence d-axis magnetic flux linkage and a stator negative sequence q-axis magnetic flux linkage.
According to the control of the rotor current through the stator positive sequence voltage vector oriented steady-state voltage equation and the stator negative sequence voltage vector oriented steady-state voltage equation, the stator negative sequence voltage can be eliminated through the stator positive sequence voltage vector oriented steady-state voltage equation and the stator negative sequence voltage vector oriented steady-state voltage equation on the rotor current at different operation rotating speeds, the amplitude and the frequency of the stator voltage are kept constant, and the stability of the output voltage when the load suddenly changes is improved.
Step S1103, detecting positive and negative sequence components of the stator voltage and the rotor current;
the implementation method of the step S1103 may specifically be:
positive and negative sequence components of stator voltage αβ coordinate system
Wherein: u. ofsα、usβIs the instantaneous value of the shaft voltage of the stator αβ usα(p)、usβ(p)Is the positive sequence voltage value of the stator αβ axis usα(n)、usβ(n)Is the stator αβ axis negative sequence voltage value;
positive and negative sequence components in stator voltage dq coordinate system
Wherein theta is the included angle between the d axis and the α axis, and usd(p)、usq(p)Is the positive sequence voltage value of the dq axis of the stator; u. ofsd(n)、usq(n)Is the negative sequence voltage value of the stator dq axis; the T is the period of the power grid;
positive and negative sequence components of rotor voltage αβ coordinate system
Wherein: u. ofrα、urβIs the instantaneous value of the shaft voltage of the rotor αβ urα(p)、urβ(p)Is the positive sequence voltage value of the rotor αβ shaft urα(n)、urβ(n)Is the rotor αβ shaft negative sequence voltage value;
positive and negative sequence components in the rotor voltage dq coordinate system
Wherein theta is the included angle between the d axis and the α axis, and urd(p)、urq(p)Is the positive sequence voltage value of the dq axis of the rotor; u. ofrd(n)、urq(n)Is the negative sequence voltage value of the dq axis of the rotor.
Step S1104, calculating the d-axis and q-axis current set values of the positive sequence and the negative sequence of the rotor;
the implementation method of the step S1104 may specifically be:
the given values of the d-axis and q-axis currents of the positive sequence of the rotor are obtained by a Proportional Integral (PI) regulator of the d-axis and q-axis voltages of the positive sequence of the stator, and the given values have
Wherein: u. ofsd(p) *＝Us(p)，usq(p) *＝0；
The given values of the d-axis and q-axis currents of the negative sequence of the rotor are obtained by a Proportional Integral (PI) regulator of the d-axis and q-axis voltages of the negative sequence of the stator, and the given values have
Wherein: u. ofsd(n) *＝0，usq(n) *＝0。
And S1105, establishing a positive sequence current control equation and a negative sequence current control equation, and controlling the control device through the positive sequence current control equation and the negative sequence current control equation.
The implementation method of step S1105 may specifically be:
the governing equation for the positive sequence current is:
the governing equation for negative sequence current is:
wherein: u. ofrd(p) cIs urd(p)Control voltage of urq(p) cIs urq(p)Control voltage of ird(p) *Is ird(p)Given value of (i)rq(p) *Is irq(p)Given value of (U)s(p)May be given a positive sequence voltage, Us(n)May be a given negative sequence voltage.
As shown in fig. 3, wherein Us *The specific implementation method for controlling the control device through the positive sequence current control equation and the negative sequence current control equation can be that u is obtained according to the positive sequence current control equation and the negative sequence current control equationrd(p) c、 urq(p) c、urd(n) c、urq(n) cWill urd(p) c、urq(p) cPerforming a 2r to 3S transformation (i.e., αβ transformation of the coordinate system to the abc coordinate system) to obtain ura(p)、urb(p)、urc(p)In the same way, urd(n) c、urq(n) c2r to 3S to obtain ura(n)、urb(n)、urc(n)Adding the positive and negative sequences to obtain ura、urb、urcWill ura、urb、urcAnd inputting the PWM signal into a PWM modulator to obtain a PWM signal, and inputting the PWM signal into a rotor side converter to realize the control of the control device.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The content downloading method, the related device and the apparatus provided in the embodiment of the present application are described in detail above, and a specific example is applied in the present application to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. A control device for connecting an induction generator to an isolated asymmetric load, said control device comprising: the system comprises a diesel engine, a double-fed induction generator, a position sensor, a diesel engine speed controller and a double-fed induction generator controller;
the diesel engine and the doubly-fed induction generator are coaxially installed, the position sensor is installed on a rotor of the doubly-fed induction generator, the position sensor is connected with the controller of the doubly-fed induction generator, the controller of the doubly-fed induction generator is connected with the doubly-fed induction generator and controls the output voltage of the doubly-fed induction generator, the speed controller of the diesel engine is connected with the diesel engine and controls the rotating speed of the diesel engine, and the speed controller of the diesel engine is connected with the controller of the doubly-fed induction generator;
the stator three-phase winding port ABC and the rotor three-phase winding port ABC of the doubly-fed induction generator are connected with the doubly-fed induction generator controller through cables, the stator three-phase winding port ABC and the neutral point port N of the doubly-fed induction generator are connected with an isolated asymmetric load through cables so as to eliminate fluctuation of each phase voltage, when the isolated asymmetric load is an isolated single-phase load, a power supply mode of a single-phase port N and a neutral point port N is provided for the isolated single-phase load, and the power supply mode of the single-phase port N and the neutral point port N is a mode that any one phase of the stator three-phase winding port ABC and the neutral point port N simultaneously supply power to the isolated single-phase load;
the double-fed induction generator controller is provided with a mapping relation between the rotating speed and the power value of the diesel engine, the double-fed induction generator controller calculates the power value of the isolated asymmetric load according to the line current and the line voltage of any phase of the stator three-phase winding port ABC, the double-fed induction generator controller obtains the rotating speed of the diesel engine corresponding to the power value of the isolated asymmetric load from the mapping relation according to the power value of the isolated asymmetric load, the double-fed induction generator controller sends the rotating speed of the diesel engine to a diesel engine speed controller, and the rotating speed of the diesel engine is used for indicating the diesel engine speed controller to control the diesel engine according to the rotating speed of the diesel engine;
the doubly-fed induction generator controller comprises: main control panel, stator side converter power return circuit, rotor side converter power return circuit, stator side filter capacitor, stator side filter reactor, direct current chain support electric capacity, direct current side absorption electric capacity, excitation direct current power supply, current sensor and voltage sensor, wherein:
a stator three-phase winding port ABC of the doubly-fed induction generator controller is connected with a stator side filter capacitor and then is connected with one end of a stator side filter reactor, and the other end of the stator side filter reactor is connected with a stator side converter power loop;
a rotor three-phase winding port abc of the doubly-fed induction generator controller is connected with a power loop of the rotor side converter; a rotor three-phase winding port abc of the doubly-fed induction generator controller is connected with a power loop of the rotor side converter; two ends of the first direct-current chain absorption capacitor are respectively connected with a direct-current chain of the stator side converter power loop, and two ends of the second direct-current chain absorption capacitor are respectively connected with a direct-current chain of the rotor side converter power loop; a first direct current chain supporting capacitor is connected with a second direct current chain supporting capacitor in series and then connected with the first direct current chain absorption capacitor in parallel, a third direct current chain supporting capacitor is connected with a fourth direct current chain supporting capacitor in series and then connected with the second direct current chain absorption capacitor in parallel, and the excitation starting direct current power supply is connected with a direct current chain of the power loop of the rotor side converter in parallel through a diode;
and the main control board is used for sending PWM signals to the stator side converter power loop and the rotor side converter power loop so as to enable the amplitude and the frequency of the voltage at the stator output side of the doubly-fed induction generator to be constant.
2. The control device according to claim 1, characterized in that three current sensors are provided at port ABC of the doubly-fed induction generator controller, at least two voltage sensors are provided at port ABC of the doubly-fed induction generator controller, and at least two current sensors are provided at port ABC of the doubly-fed induction generator controller.
3. The control device of claim 2, wherein the dc link of the stator-side converter power loop is provided with a voltage sensor and at least two current sensors are provided between the stator-side filter reactor and the stator-side converter power loop.
4. A method of controlling an induction generator to connect isolated asymmetric loads according to any one of claims 1 to 3, said method comprising:
establishing a steady-state voltage equation of the doubly-fed induction generator oriented by adopting a stator positive sequence voltage vector under a positive sequence synchronous rotating coordinate system; the stator positive sequence voltage vector orientation specifically includes: the d axis coincides with the positive sequence voltage vector position of the stator;
establishing a steady-state voltage equation of the doubly-fed induction generator under a negative sequence synchronous rotating coordinate system by adopting stator negative sequence voltage vector orientation, wherein the stator negative sequence voltage vector orientation comprises the following steps: the d axis coincides with the position of a negative sequence voltage vector of the stator;
detecting positive and negative sequence components of the stator voltage and the rotor current;
calculating d-axis and q-axis current set values of a positive sequence, a negative sequence and a rotor;
establishing a positive sequence current control equation and a negative sequence current control equation, obtaining a control voltage of a rotor positive sequence d-axis voltage, a control voltage of a rotor positive sequence q-axis voltage, a control voltage of a rotor negative sequence d-axis voltage and a control voltage of a rotor negative sequence q-axis voltage according to the positive sequence current control equation and the negative sequence current control equation, transforming the control voltage of the rotor positive sequence d-axis voltage and the control voltage of the rotor positive sequence q-axis voltage from a dp coordinate system to an abc coordinate system to obtain a rotor positive sequence a-axis voltage, a rotor positive sequence b-axis voltage and a rotor positive sequence c-axis voltage, transforming the control voltage of the rotor negative sequence d-axis voltage and the control voltage of the rotor negative sequence q-axis voltage from the dp coordinate system to the abc coordinate system to obtain a rotor negative sequence a-axis voltage, a rotor negative sequence b-axis voltage and a rotor negative sequence c-axis voltage, adding the rotor positive sequence a-axis voltage and the rotor negative sequence a-axis voltage to obtain a rotor a-axis voltage, adding the rotor positive sequence b-axis voltage and the rotor negative, and adding the rotor positive sequence c-axis voltage and the rotor negative sequence c-axis voltage to obtain a rotor c-axis voltage, and controlling the control device according to the rotor a-axis voltage, the rotor b-axis voltage and the rotor c-axis voltage.
5. The method according to claim 4, wherein the establishing of the steady-state voltage equation of the doubly-fed induction generator oriented by the stator positive sequence voltage vector under the positive sequence synchronous rotating coordinate system specifically comprises:
usd(p)＝-ω1ψsq(p)＝-ω1(Lsisq(p)+Lmirq(p))＝Us(p)
usq(p)＝ω1ψsd(p)＝ω1(Lsisd(p)+Lmird(p))＝0
urd(p)＝Rrird(p)+sUs(p)
urq(p)＝Rrirq(p)
wherein: u shapes(p)Is the magnitude of the stator positive sequence voltage vector, RrFor rotor winding phaseA resistance; l iss、LmThe self inductance of the stator winding and the mutual inductance of the stator and the rotor windings are respectively adopted; omega1Is the synchronous angular frequency; s is the slip of the motor; u. ofsd(p)、usq(p)、urd(p)、urq(p)Respectively are positive stator sequence d-axis voltage, positive stator sequence q-axis voltage, positive rotor sequence d-axis voltage and positive rotor sequence q-axis voltage; i.e. isd(p)、isq(p)、ird(p)、irq(p)The positive sequence d-axis current of the stator, the positive sequence q-axis current of the stator, the positive sequence d-axis current of the rotor and the positive sequence q-axis current of the rotor are respectively; psisd(p)、ψsq(p)The positive sequence of the stator is d-axis magnetic linkage, and the positive sequence of the stator is q-axis magnetic linkage.
6. The method according to claim 5, wherein the establishing of the steady-state voltage equation of the doubly-fed induction generator under the negative sequence synchronous rotating coordinate system and with the stator negative sequence voltage vector orientation specifically comprises:
usd(n)＝ω1ψsq(n)＝ω1(Lsisq(n)+Lmirq(n))＝Us(n)
usq(n)＝-ω1ψsd(n)＝-ω1(Lsisd(n)+Lmird(n))＝0
urd(n)＝Rrird(n)+(2-s)Us(n)
urq(n)＝Rrirq(n)
wherein: u shapes(n)Is the magnitude of the stator negative sequence voltage vector, usd(n)、usq(n)、urd(n)、urq(n)Respectively are stator negative sequence d-axis voltage, stator negative sequence q-axis voltage, rotor negative sequence d-axis voltage and rotor negative sequence q-axis voltage; i.e. isd(n)、isq(n)、ird(n)、irq(n)The negative sequence of the stator is d-axis current, the negative sequence of the stator is q-axis current, the negative sequence of the rotor is d-axis current, and the negative sequence of the rotor is q-axis current; psisd(n)、ψsq(n)The magnetic flux linkage comprises a stator negative sequence d-axis magnetic flux linkage and a stator negative sequence q-axis magnetic flux linkage.
7. The method of claim 6, wherein the detecting positive and negative sequence components of the stator voltage and the rotor current comprises:
positive and negative sequence components of stator voltage αβ coordinate system
Wherein: u. ofsα、usβIs the instantaneous value of the shaft voltage of the stator αβ usα(p)、usβ(p)Is the positive sequence voltage value of the stator αβ axis usα(n)、usβ(n)Is the stator αβ axis negative sequence voltage value;
positive and negative sequence components in stator voltage dq coordinate system
Wherein theta is the included angle between the d axis and the α axis, and usd(p)、usq(p)Is the positive sequence voltage value of the dq axis of the stator; u. ofsd(n)、usq(n)Is the negative sequence voltage value of the stator dq axis; the T is the period of the power grid;
positive and negative sequence components of rotor voltage αβ coordinate system
Wherein: u. ofrα、urβIs the instantaneous value of the shaft voltage of the rotor αβ urα(p)、urβ(p)Is the positive sequence voltage value of the rotor αβ shaft urα(n)、urβ(n)Is the rotor αβ shaft negative sequence voltage value;
positive and negative sequence components in the rotor voltage dq coordinate system
Wherein theta is the included angle between the d axis and the α axis, and urd(p)、urq(p)Is the positive sequence voltage value of the dq axis of the rotor; u. ofrd(n)、urq(n)Is the negative sequence voltage value of the dq axis of the rotor.
8. The method according to claim 7, wherein the calculating of the given values of the positive sequence d-axis current, the negative sequence q-axis current specifically comprises:
the given values of the d-axis and q-axis currents of the positive sequence of the rotor are obtained by a proportional integral PI regulator of the d-axis and q-axis voltages of the positive sequence of the stator, and the given values have
Wherein: u. ofsd(p) *＝Us(p)，usq(p) *＝0；
The given values of the d-axis and q-axis currents of the negative sequence of the rotor are obtained by a proportional integral PI regulator of the d-axis and q-axis voltages of the negative sequence of the stator, and the given values have
Wherein: u. ofsd(n) *＝0，usq(n) *＝0。
9. The method according to claim 8, wherein the establishing of the positive-sequence and negative-sequence current control equations specifically comprises:
the governing equation for the positive sequence current is:
the governing equation for negative sequence current is:
wherein: u. ofrd(p) cIs urd(p)Control voltage of urq(p) cIs urq(p)Control voltage of ird(p) *Is ird(p)Given value of (i)rq(p) *Is irq(p)Given values of (a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879075.0A CN106385212B (en) | 2016-09-30 | 2016-09-30 | Control device for connecting induction generator to isolated asymmetric load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610879075.0A CN106385212B (en) | 2016-09-30 | 2016-09-30 | Control device for connecting induction generator to isolated asymmetric load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106385212A CN106385212A (en) | 2017-02-08 |
| CN106385212B true CN106385212B (en) | 2020-02-21 |
Family
ID=57936279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610879075.0A Active CN106385212B (en) | 2016-09-30 | 2016-09-30 | Control device for connecting induction generator to isolated asymmetric load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106385212B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237212A (en) * | 2008-02-27 | 2008-08-06 | 王雪霖 | Automatic shift frequency and voltage constant diesel oil generator unit |
| CN103187914A (en) * | 2013-04-19 | 2013-07-03 | 三垦力达电气(江阴)有限公司 | Power generation system based on brushless double-fed generator and excitation method for power generation system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2456064B1 (en) * | 2010-11-17 | 2015-09-30 | ABB Technology Oy | Control method for doubly-fed electric generator |
-
2016
- 2016-09-30 CN CN201610879075.0A patent/CN106385212B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237212A (en) * | 2008-02-27 | 2008-08-06 | 王雪霖 | Automatic shift frequency and voltage constant diesel oil generator unit |
| CN103187914A (en) * | 2013-04-19 | 2013-07-03 | 三垦力达电气(江阴)有限公司 | Power generation system based on brushless double-fed generator and excitation method for power generation system |
Non-Patent Citations (1)
| Title |
|---|
| 双馈风力发电机在电网电压不对称骤升下无功功率优化控制;谢震等;《中国电机工程学报》;20150705;第35卷(第13期);第3211-3220页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106385212A (en) | 2017-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101936992B1 (en) | Charging system for wound rotor synchronous motor | |
| US9252601B2 (en) | Method for controlling a power converter in a wind turbine generator | |
| CN101304234B (en) | Power converters | |
| CN103199790B (en) | Three-phase four-arm Control System of Permanent Magnet Synchronous Motor and control method | |
| CN105098804B (en) | The control method and device of the three phase unbalance current of virtual synchronous generator | |
| CN107070335B (en) | Double PWM permanent magnetism power-driven system torque feed forward control methods and its control device | |
| CN107154761B (en) | full-control rectification system and control method for generator | |
| KR20180045966A (en) | Charging system for wound rotor synchronous motor | |
| CN106849812A (en) | A kind of asynchronous motor control method based on flux compensation | |
| CN104579060A (en) | Indirect power control methods of cage-type rotor brushless double-fed wind generator | |
| CN103259476B (en) | Frequency conversion alternating current generation system control method with voltage harmonic suppression function | |
| CN105024602B (en) | A kind of asynchronous motor power generation system of stator duplex winding and control method | |
| CN104868808A (en) | Aerial three-stage brushless power generation system starting excitation control method of two-phase exciter | |
| CN108039843B (en) | Stator frequency control method of DFIG-DC system | |
| CN109256997A (en) | The control method of winding permanent magnet synchronous motor system is opened based on double-current sensor common DC bus | |
| CN101499665A (en) | Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set | |
| Sarma et al. | Implementation of a conventional DFIG stator flux oriented control scheme using industrial converters | |
| EP2731262B1 (en) | Variable frequency speed control system for motor | |
| CN207218582U (en) | The DC bus current control system of double feedback electric engine frequency conversion speed-adjusting system | |
| CN109120206B (en) | Direct current bus current control system of double-fed motor variable-frequency speed regulation system | |
| CN105406785A (en) | Shaft doubly-fed generator system for ship | |
| CN106452235B (en) | Brushless dual-feed motor stand alone generating system excitation control method under asymmetric load | |
| CN106385212B (en) | Control device for connecting induction generator to isolated asymmetric load | |
| CN207117518U (en) | Double feedback electric engine frequency conversion speed-adjusting system based on current source converter | |
| CN105305918B (en) | He of a kind of double feedback electric engine controls formula control method and its double feedback electric engine system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211109 Address after: 518043 No. 01, 39th floor, building a, antuoshan headquarters building, No. 33, antuoshan Sixth Road, Xiang'an community, Xiangmihu street, Futian District, Shenzhen, Guangdong Province Patentee after: Huawei Digital Energy Technology Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |