CN114553079B - Voltage-adjustable switched reluctance generator power converter and control method thereof - Google Patents
Voltage-adjustable switched reluctance generator power converter and control method thereof Download PDFInfo
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- CN114553079B CN114553079B CN202210447758.4A CN202210447758A CN114553079B CN 114553079 B CN114553079 B CN 114553079B CN 202210447758 A CN202210447758 A CN 202210447758A CN 114553079 B CN114553079 B CN 114553079B
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/006—Means for protecting the generator by using control
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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
- 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
- H02P9/12—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 demagnetising; for reducing effects of remanence; for preventing pole reversal
- H02P9/123—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 demagnetising; for reducing effects of remanence; for preventing pole reversal for demagnetising; for reducing effects of remanence
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to a driving system of a switched reluctance generator, in particular to a voltage-adjustable power converter of the switched reluctance generator and a control method thereof. The invention solves the problem that the existing power converter can not flexibly adjust the excitation voltage and the demagnetization voltage of the switched reluctance generator. A voltage-adjustable switched reluctance generator power converter comprises a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a first fly-wheel diode, a second fly-wheel diode, a third fly-wheel diode, a fourth fly-wheel diode and a Buck-Boost converter; the Buck-Boost converter comprises a sixth switching tube, a fifth freewheeling diode and an inductor; the positive end of the first capacitor is connected with the positive power supply end; the negative end of the first capacitor is connected with the negative power supply end; the positive end of the second capacitor is connected with the negative power supply end. The invention is suitable for the switch reluctance generator.
Description
Technical Field
The invention relates to a driving system of a switched reluctance generator, in particular to a voltage-adjustable power converter of the switched reluctance generator and a control method thereof.
Background
The switched reluctance generator is a special motor without a permanent magnet, and has a good application prospect in the fields of electric automobiles, ships, aerospace and the like due to the advantages of simple design, low manufacturing cost, convenience in realizing flexible switching of the electric/power generation states and the like. The power converter is used as an important place for energy exchange of a driving system of the switched reluctance generator, and plays a great role in improving the output capacity, optimizing the system performance and managing the energy.
Under the prior art, power converters commonly employ asymmetric half-bridge circuits (as shown in fig. 1). However, in practical application, due to the limitation of the principle of the circuit, the excitation voltage and the demagnetization voltage of the switched reluctance generator cannot be flexibly adjusted, so that the switched reluctance generator has a small output power range, poor high-speed and low-speed performance and low power generation efficiency. Therefore, a power converter of a voltage-adjustable switched reluctance generator and a control method thereof are needed to solve the problem that the existing power converter cannot flexibly adjust the excitation voltage and the demagnetization voltage of the switched reluctance generator.
Disclosure of Invention
The invention provides a voltage-adjustable switched reluctance generator power converter and a control method thereof, aiming at solving the problem that the existing power converter can not flexibly adjust the excitation voltage and the demagnetization voltage of a switched reluctance generator.
The invention is realized by adopting the following technical scheme:
a voltage-adjustable switched reluctance generator power converter comprises a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a first fly-wheel diode, a second fly-wheel diode, a third fly-wheel diode, a fourth fly-wheel diode and a Buck-Boost converter;
the Buck-Boost converter comprises a sixth switching tube, a fifth freewheeling diode and an inductor;
the positive end of the first capacitor is connected with the positive power supply end; the negative end of the first capacitor is connected with the negative power supply end; the positive end of the second capacitor is connected with the negative power supply end;
the collector of the first switch tube is connected with the negative end of the first phase winding of the switched reluctance generator; the collector of the second switch tube is connected with the negative end of the second phase winding of the switched reluctance generator; the collector of the third switching tube is connected with the negative end of the third phase winding of the switched reluctance generator; the emitting electrode of the first switching tube, the emitting electrode of the second switching tube and the emitting electrode of the third switching tube are connected with the negative end of the second capacitor;
the anode of the first freewheeling diode is connected with the negative end of the first phase winding of the switched reluctance generator; the anode of the second freewheeling diode is connected with the negative end of the second phase winding of the switched reluctance generator; the anode of the third freewheeling diode is connected with the negative end of the third phase winding of the switched reluctance generator; the cathode of the first fly-wheel diode, the cathode of the second fly-wheel diode and the cathode of the third fly-wheel diode are all connected with the positive power supply end;
a collector of the fourth switching tube is connected with the positive power supply end; an emitter of the fourth switching tube is respectively connected with the positive end of the first phase winding of the switched reluctance generator, the positive end of the second phase winding of the switched reluctance generator and the positive end of the third phase winding of the switched reluctance generator;
a collector of the fifth switching tube is connected with the negative power supply end; an emitter of the fifth switch tube is respectively connected with the positive end of the first phase winding of the switched reluctance generator, the positive end of the second phase winding of the switched reluctance generator and the positive end of the third phase winding of the switched reluctance generator;
the cathode of the fourth freewheeling diode is respectively connected with the emitter of the fourth switching tube and the emitter of the fifth switching tube; the anode of the fourth freewheeling diode is connected with the negative end of the second capacitor;
a collector of the sixth switching tube is connected with the positive power supply end; an emitter of the sixth switching tube is connected with the negative power supply end through an inductor;
the cathode of the fifth fly-wheel diode is connected with the emitter of the sixth switching tube; and the anode of the fifth freewheeling diode is connected with the negative end of the second capacitor.
A method for controlling a voltage-scalable switched reluctance generator power converter (for controlling a voltage-scalable switched reluctance generator power converter according to the present invention) comprising the following control modes:
1) rated excitation control mode: under a rated excitation control mode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are controlled to be switched on, and the fifth switch tube and the sixth switch tube are controlled to be switched off;
at this time, the paths of the excitation current are: starting from the positive end of the first capacitor, on one hand, the current flows through the fourth switching tube, the first phase winding of the switched reluctance generator, the first switching tube, the fifth freewheeling diode and the inductor in sequence and then returns to the negative end of the first capacitor, on the other hand, the current flows through the fourth switching tube, the second phase winding of the switched reluctance generator, the second switching tube, the fifth freewheeling diode and the inductor in sequence and then returns to the negative end of the first capacitor, and on the other hand, the current flows through the fourth switching tube, the third phase winding of the switched reluctance generator, the third switching tube, the fifth freewheeling diode and the inductor in sequence and then returns to the negative end of the first capacitor;
in the process, the voltage of the excitation power supply is used as an input voltage, and the on-state voltage drop of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth fly-wheel diode is neglected, so that the excitation voltage of the switched reluctance generator is equal to the voltage of the first capacitor and the input voltage;
2) weak excitation control mode: in a weak excitation control mode, a first switching tube, a second switching tube, a third switching tube and a fifth switching tube are controlled to be switched on, a fourth switching tube is controlled to be switched off, and the Buck-Boost converter works in a Buck state;
at this time, the paths of the excitation current are: starting from the positive end of the second capacitor, on one hand, the current flows through a fifth switching tube, a first phase winding of the switched reluctance generator and the first switching tube in sequence and then returns to the negative end of the second capacitor, on the other hand, the current flows through the fifth switching tube, a second phase winding of the switched reluctance generator and the second switching tube in sequence and then returns to the negative end of the second capacitor, and on the other hand, the current flows through the fifth switching tube, a third phase winding of the switched reluctance generator and the third switching tube in sequence and then returns to the negative end of the second capacitor;
in the process, the voltage of the excitation power supply is used as an input voltage, and the on-state voltage drop of the first switching tube, the second switching tube, the third switching tube and the fifth switching tube is neglected, so that the excitation voltage of the switched reluctance generator is equal to the voltage of the second capacitor, and the excitation voltage of the switched reluctance generator is lower than the input voltage;
3) the strong excitation control mode comprises the following steps: under a strong excitation control mode, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are controlled to be switched on, the fifth switching tube is controlled to be switched off, and the Buck-Boost converter works in a Boost state;
at this time, the paths of the excitation current are: starting from the positive end of the first capacitor, on one hand, the current flows through the fourth switching tube, the first phase winding of the switched reluctance generator and the first switching tube in sequence and then returns to the negative end of the second capacitor, on the other hand, the current flows through the fourth switching tube, the second phase winding of the switched reluctance generator and the second switching tube in sequence and then returns to the negative end of the second capacitor, and on the other hand, the current flows through the fourth switching tube, the third phase winding of the switched reluctance generator and the third switching tube in sequence and then returns to the negative end of the second capacitor;
in the process, the voltage of the excitation power supply is used as the input voltage, and the on-state voltage drops of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are ignored, so that the excitation voltage of the switched reluctance generator is equal to the sum of the voltage of the second capacitor and the voltage of the first capacitor, and the excitation voltage of the switched reluctance generator is higher than the input voltage;
4) a power generation control mode: in the power generation control mode, the switched reluctance generator generates electric energy;
the power generation control mode comprises two modes:
4.1) in the first power generation control mode, the fifth switching tube is controlled to be switched on, and the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are controlled to be switched off;
at this time, the path of the generated current is: on one hand, the switched reluctance generator starts from the negative end of the first phase winding of the switched reluctance generator, flows through the first freewheeling diode, the first capacitor and the fifth switching tube in sequence and then returns to the positive end of the first phase winding of the switched reluctance generator, on the other hand, starts from the negative end of the second phase winding of the switched reluctance generator, flows through the second freewheeling diode, the first capacitor and the fifth switching tube in sequence and then returns to the positive end of the second phase winding of the switched reluctance generator, and on the third hand, the switched reluctance generator starts from the negative end of the third phase winding of the switched reluctance generator, flows through the third freewheeling diode, the first capacitor and the fifth switching tube in sequence and then returns to the positive end of the third phase winding of the switched reluctance generator;
in the process, the voltage of the first capacitor is used as an output voltage, and the on-state voltage drop of the fifth switching tube, the first freewheeling diode, the second freewheeling diode and the third freewheeling diode is neglected, so that the demagnetization voltage of the switched reluctance generator is equal to the voltage of the first capacitor;
4.2) in the second power generation control mode, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube are controlled to be turned off;
at this time, the path of the generated current is: on one hand, the switched reluctance generator starts from the negative end of the first phase winding of the switched reluctance generator, sequentially flows through a first freewheeling diode, a first capacitor, a second capacitor and a fourth freewheeling diode and then returns to the positive end of the first phase winding of the switched reluctance generator, on the other hand, starts from the negative end of the second phase winding of the switched reluctance generator, sequentially flows through a second freewheeling diode, a first capacitor, a second capacitor and a fourth freewheeling diode and then returns to the positive end of the second phase winding of the switched reluctance generator, and on the third hand, starts from the negative end of the third phase winding of the switched reluctance generator, sequentially flows through a third freewheeling diode, a first capacitor, a second capacitor and a fourth freewheeling diode and then returns to the positive end of the third phase winding of the switched reluctance generator;
in the process, the voltage of the first capacitor is used as an output voltage, and the on-state voltage drops of the first freewheeling diode, the second freewheeling diode, the third freewheeling diode and the fourth freewheeling diode are ignored, so that the demagnetization voltage of the switched reluctance generator is equal to the sum of the voltage of the first capacitor and the voltage of the second capacitor.
Compared with the existing power converter, the voltage-adjustable switched reluctance generator power converter and the control method thereof have the following advantages: the invention can flexibly adjust the excitation voltage of the switched reluctance generator (the excitation voltage is equal to the input voltage in a rated excitation control mode, the excitation voltage is lower than the input voltage in a weak excitation control mode, and the excitation voltage is higher than the input voltage in a strong excitation control mode), thereby realizing the weak magnetic suppression of the overvoltage of the switched reluctance generator during high-speed operation in the weak excitation control mode, and improving the power density, low-speed excitation starting power generation capability and high-speed operation power output capability of the switched reluctance generator during the strong excitation control mode, thereby effectively expanding the output power range of the switched reluctance generator and effectively improving the high-speed and low-speed performance of the switched reluctance generator. Secondly, the invention can flexibly adjust the demagnetization voltage of the switched reluctance generator (in the first generation control mode, the demagnetization voltage is equal to the voltage of the first capacitor, and in the second generation control mode, the demagnetization voltage is equal to the sum of the voltage of the first capacitor and the voltage of the second capacitor), thereby reducing the effective value of the generated current and reducing the loss in the generation control mode, and effectively improving the generation efficiency.
The invention has reasonable structure and ingenious design, effectively solves the problem that the existing power converter can not flexibly adjust the excitation voltage and the demagnetization voltage of the switched reluctance generator, and is suitable for the switched reluctance generator.
Drawings
Fig. 1 is a circuit schematic of a prior art power converter.
Fig. 2 is a circuit schematic of the present invention.
Fig. 3 is a schematic diagram of the nominal energization control mode in the present invention.
Fig. 4 is a schematic diagram of the weak excitation control mode in the present invention.
Fig. 5 is a schematic diagram of the strong excitation control mode in the present invention.
Fig. 6 is a schematic view of a first power generation control mode in the present invention.
Fig. 7 is a schematic view of a second mode of power generation control in the present invention.
In the figure: the dotted line indicates the path of the current.
Detailed Description
A voltage-adjustable switched reluctance generator power converter comprises a first capacitor Co, a second capacitor Cb, a first switch tube Sa, a second switch tube Sb, a third switch tube Sc, a fourth switch tube Sd, a fifth switch tube Se, a first fly-wheel diode Da, a second fly-wheel diode Db, a third fly-wheel diode Dc, a fourth fly-wheel diode Dd and a Buck-Boost converter;
the Buck-Boost converter comprises a sixth switching tube Sf, a fifth freewheeling diode De and an inductor L;
the positive end of the first capacitor Co is connected with the positive power supply end; the negative end of the first capacitor Co is connected with the negative power supply end; the positive end of the second capacitor Cb is connected with the negative power supply end;
the collector of the first switch tube Sa is connected with the negative end of a first phase winding W1 of the switched reluctance generator; the collector of the second switch tube Sb is connected with the negative end of the second phase winding W2 of the switched reluctance generator; the collector of the third switching tube Sc is connected with the negative end of a third phase winding W3 of the switched reluctance generator; an emitting electrode of the first switching tube Sa, an emitting electrode of the second switching tube Sb and an emitting electrode of the third switching tube Sc are connected with the negative end of the second capacitor Cb;
the anode of the first freewheeling diode Da is connected to the negative terminal of the first phase winding W1 of the switched reluctance generator; the anode of the second freewheeling diode Db is connected to the negative terminal of the second phase winding W2 of the switched reluctance generator; the anode of the third freewheeling diode Dc is connected to the negative terminal of the third phase winding W3 of the switched reluctance generator; the cathode of the first freewheeling diode Da, the cathode of the second freewheeling diode Db, and the cathode of the third freewheeling diode Dc are all connected to the positive power supply terminal;
a collector of the fourth switching tube Sd is connected with the positive power supply end; an emitter of the fourth switching tube Sd is connected with a positive end of the first phase winding W1 of the switched reluctance generator, a positive end of the second phase winding W2 of the switched reluctance generator, and a positive end of the third phase winding W3 of the switched reluctance generator respectively;
a collector of the fifth switching tube Se is connected with the negative power supply end; an emitter of the fifth switching tube Se is respectively connected with the positive end of the first phase winding W1, the positive end of the second phase winding W2 and the positive end of the third phase winding W3 of the switched reluctance generator;
the cathode of the fourth freewheeling diode Dd is connected with the emitter of the fourth switching tube Sd and the emitter of the fifth switching tube Se respectively; the anode of the fourth freewheeling diode Dd is connected to the negative terminal of the second capacitor Cb;
a collector of the sixth switching tube Sf is connected with the positive power supply end; an emitter of the sixth switching tube Sf is connected with the negative power supply end through an inductor L;
the cathode of the fifth freewheeling diode De is connected with the emitter of the sixth switching tube Sf; the anode of the fifth freewheeling diode De is connected to the negative terminal of the second capacitor Cb.
A method for controlling a voltage-scalable switched reluctance generator power converter (for controlling a voltage-scalable switched reluctance generator power converter according to the present invention) comprising the following control modes:
1) rated excitation control mode: under a rated excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fourth switching tube Sd are controlled to be switched on, and a fifth switching tube Se and a sixth switching tube Sf are controlled to be switched off;
at this time, the path of the excitation current Ii is: from the positive end of the first capacitor Co, the third side flows through a fourth switching tube Sd, a first phase winding W1 of the switched reluctance generator, a first switching tube Sa, a fifth fly-wheel diode De and an inductor L in sequence and then returns to the negative end of the first capacitor Co, and the third side flows through the fourth switching tube Sd, a second phase winding W2 of the switched reluctance generator, a second switching tube Sb, the fifth fly-wheel diode De and the inductor L in sequence and then returns to the negative end of the first capacitor Co, and the third side flows through the fourth switching tube Sd, a third phase winding W3 of the switched reluctance generator, a third switching tube Sc, the fifth fly-wheel diode De and the inductor L in sequence and then returns to the negative end of the first capacitor Co;
in the process, the voltage of the excitation power supply is used as an input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc, the fourth switching tube Sd and the fifth freewheeling diode De are ignored, so that the excitation voltage of the switched reluctance generator is equal to both the voltage UCo of the first capacitor Co and the input voltage Ui;
2) weak excitation control mode: in a weak excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fifth switching tube Se are controlled to be switched on, a fourth switching tube Sd is controlled to be switched off, and a Buck-Boost converter works in a Buck state;
at this time, the path of the excitation current Ii is: from the positive end of the second capacitor Cb, on the one hand, the current flows through the fifth switching tube Se, the first phase winding W1 of the switched reluctance generator and the first switching tube Sa in sequence and then returns to the negative end of the second capacitor Cb, on the other hand, the current flows through the fifth switching tube Se, the second phase winding W2 of the switched reluctance generator and the second switching tube Sb in sequence and then returns to the negative end of the second capacitor Cb, and on the third hand, the current flows through the fifth switching tube Se, the third phase winding W3 of the switched reluctance generator and the third switching tube Sc in sequence and then returns to the negative end of the second capacitor Cb;
in the process, the voltage of the excitation power supply is used as the input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fifth switching tube Se are ignored, so that the excitation voltage of the switched reluctance generator is equal to the voltage UCb of the second capacitor Cb, and the excitation voltage of the switched reluctance generator is lower than the input voltage Ui;
3) the strong excitation control mode comprises the following steps: in a strong excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fourth switching tube Sd are controlled to be switched on, a fifth switching tube Se is controlled to be switched off, and a Buck-Boost converter works in a Boost state;
at this time, the path of the excitation current Ii is: starting from the positive end of the first capacitor Co, on one hand, the current flows through the fourth switching tube Sd, the first phase winding W1 of the switched reluctance generator and the first switching tube Sa in sequence and then returns to the negative end of the second capacitor Cb, on the other hand, the current flows through the fourth switching tube Sd, the second phase winding W2 of the switched reluctance generator and the second switching tube Sb in sequence and then returns to the negative end of the second capacitor Cb, and on the other hand, the current flows through the fourth switching tube Sd, the third phase winding W3 of the switched reluctance generator and the third switching tube Sc in sequence and then returns to the negative end of the second capacitor Cb;
in the process, the voltage of the excitation power supply is used as an input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fourth switching tube Sd are ignored, so that the excitation voltage of the switched reluctance generator is equal to the sum of the voltage UCb of the second capacitor Cb and the voltage UCo of the first capacitor Co, and the excitation voltage of the switched reluctance generator is higher than the input voltage Ui;
4) a power generation control mode: in the power generation control mode, the switched reluctance generator generates electric energy;
the power generation control mode comprises two modes:
4.1) in the first power generation control mode, the fifth switching tube Se is controlled to be switched on, and the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fourth switching tube Sd are controlled to be switched off;
at this time, the path of the generated current Io is: on one hand, the current flows from the negative end of a first phase winding W1 of the switched reluctance generator in sequence, then flows through a first freewheeling diode Da, a first capacitor Co and a fifth switching tube Se and then returns to the positive end of a first phase winding W1 of the switched reluctance generator, on the other hand, flows from the negative end of a second phase winding W2 of the switched reluctance generator, flows through a second freewheeling diode Db, a first capacitor Co and a fifth switching tube Se in sequence, then returns to the positive end of a second phase winding W2 of the switched reluctance generator, and on the third hand, the current flows from the negative end of a third phase winding W3 of the switched reluctance generator, flows through a third freewheeling diode Dc, a first capacitor Co and a fifth switching tube Se in sequence and then returns to the positive end of a third phase winding W3 of the switched reluctance generator;
in the process, the voltage UCo of the first capacitor Co is used as the output voltage Uo, and the demagnetization voltage of the switched reluctance generator is equal to the voltage UCo of the first capacitor Co by neglecting the on-state voltage drops of the fifth switching tube Se, the first freewheeling diode Da, the second freewheeling diode Db and the third freewheeling diode Dc;
4.2) in the second power generation control mode, the first switching tube Sa, the second switching tube Sb, the third switching tube Sc, the fourth switching tube Sd and the fifth switching tube Se are controlled to be switched off;
at this time, the path of the generated current Io is: on one hand, the current flows from the negative end of a first phase winding W1 of the switched reluctance generator in sequence, then flows through a first freewheeling diode Da, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of a first phase winding W1 of the switched reluctance generator, on the other hand, flows from the negative end of a second phase winding W2 of the switched reluctance generator in sequence, flows through a second freewheeling diode Db, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of a second phase winding W2 of the switched reluctance generator, and on the third hand, flows from the negative end of a third phase winding W3 of the switched reluctance generator in sequence, flows through a third freewheeling diode Dc, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of a third phase winding W3 of the switched reluctance generator;
in the process, the voltage UCo of the first capacitor Co is used as the output voltage Uo, and the demagnetization voltage of the switched reluctance generator is equal to the sum of the voltage UCo of the first capacitor Co and the voltage UCb of the second capacitor Cb by neglecting the on-state voltage drops of the first freewheeling diode Da, the second freewheeling diode Db, the third freewheeling diode Dc and the fourth freewheeling diode Dd.
The on-off control signal of the first switch tube Sa, the on-off control signal of the second switch tube Sb, the on-off control signal of the third switch tube Sc, the on-off control signal of the fourth switch tube Sd, the on-off control signal of the fifth switch tube Se and the on-off control signal of the sixth switch tube Sf are all provided by a PWM controller or a current chopping controller.
The excitation power supply is commercial power or a storage battery.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (4)
1. A voltage-adjustable switched reluctance generator power converter is characterized in that: the direct current converter comprises a first capacitor Co, a second capacitor Cb, a first switch tube Sa, a second switch tube Sb, a third switch tube Sc, a fourth switch tube Sd, a fifth switch tube Se, a first freewheeling diode Da, a second freewheeling diode Db, a third freewheeling diode Dc, a fourth freewheeling diode Dd and a Buck-Boost converter;
the Buck-Boost converter comprises a sixth switching tube Sf, a fifth freewheeling diode De and an inductor L;
the positive end of the first capacitor Co is connected with the positive power supply end; the negative end of the first capacitor Co is connected with the negative power supply end; the positive end of the second capacitor Cb is connected with the negative power supply end;
the collector of the first switch tube Sa is connected with the negative end of a first phase winding W1 of the switched reluctance generator; the collector of the second switch tube Sb is connected with the negative end of the second phase winding W2 of the switched reluctance generator; the collector of the third switching tube Sc is connected with the negative end of a third phase winding W3 of the switched reluctance generator; an emitting electrode of the first switching tube Sa, an emitting electrode of the second switching tube Sb and an emitting electrode of the third switching tube Sc are connected with the negative end of the second capacitor Cb;
the anode of the first freewheeling diode Da is connected to the negative terminal of the first phase winding W1 of the switched reluctance generator; the anode of the second freewheeling diode Db is connected to the negative terminal of the second phase winding W2 of the switched reluctance generator; the anode of the third freewheeling diode Dc is connected to the negative terminal of the third phase winding W3 of the switched reluctance generator; the cathode of the first freewheeling diode Da, the cathode of the second freewheeling diode Db, and the cathode of the third freewheeling diode Dc are all connected to the positive power supply terminal;
a collector of the fourth switching tube Sd is connected with the positive power supply end; an emitter of the fourth switching tube Sd is connected with a positive end of the first phase winding W1 of the switched reluctance generator, a positive end of the second phase winding W2 of the switched reluctance generator, and a positive end of the third phase winding W3 of the switched reluctance generator respectively;
a collector of the fifth switching tube Se is connected with the negative power supply end; an emitter of the fifth switching tube Se is respectively connected with the positive end of the first phase winding W1, the positive end of the second phase winding W2 and the positive end of the third phase winding W3 of the switched reluctance generator;
the cathode of the fourth freewheeling diode Dd is connected with the emitter of the fourth switching tube Sd and the emitter of the fifth switching tube Se respectively; the anode of the fourth freewheeling diode Dd is connected to the negative terminal of the second capacitor Cb;
the collector of the sixth switching tube Sf is connected with the positive power supply end; an emitter of the sixth switching tube Sf is connected with the negative power supply end through an inductor L;
the cathode of the fifth freewheeling diode De is connected with the emitter of the sixth switching tube Sf; the anode of the fifth freewheeling diode De is connected to the negative terminal of the second capacitor Cb.
2. A method of controlling a voltage-regulated switched reluctance generator power converter as claimed in claim 1, wherein: the method comprises the following control modes:
1) rated excitation control mode: under a rated excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fourth switching tube Sd are controlled to be switched on, and a fifth switching tube Se and a sixth switching tube Sf are controlled to be switched off;
at this time, the path of the excitation current Ii is: from the positive end of the first capacitor Co, on one hand, the current flows through a fourth switching tube Sd, a first phase winding W1 of the switched reluctance generator, the first switching tube Sa, a fifth freewheeling diode De and an inductor L in sequence and then returns to the negative end of the first capacitor Co, on the other hand, the current flows through the fourth switching tube Sd, a second phase winding W2 of the switched reluctance generator, a second switching tube Sb, a fifth freewheeling diode De and an inductor L in sequence and then returns to the negative end of the first capacitor Co, and on the third hand, the current flows through the fourth switching tube Sd, a third phase winding W3 of the switched reluctance generator, a third switching tube Sc, a fifth freewheeling diode De and an inductor L in sequence and then returns to the negative end of the first capacitor Co;
in the process, the voltage of the excitation power supply is used as an input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc, the fourth switching tube Sd and the fifth freewheeling diode De are ignored, so that the excitation voltage of the switched reluctance generator is equal to both the voltage UCo of the first capacitor Co and the input voltage Ui;
2) weak excitation control mode: in a weak excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fifth switching tube Se are controlled to be switched on, a fourth switching tube Sd is controlled to be switched off, and a Buck-Boost converter works in a Buck state;
at this time, the path of the excitation current Ii is: from the positive end of the second capacitor Cb, on the one hand, the current flows through the fifth switching tube Se, the first phase winding W1 of the switched reluctance generator and the first switching tube Sa in sequence and then returns to the negative end of the second capacitor Cb, on the other hand, the current flows through the fifth switching tube Se, the second phase winding W2 of the switched reluctance generator and the second switching tube Sb in sequence and then returns to the negative end of the second capacitor Cb, and on the third hand, the current flows through the fifth switching tube Se, the third phase winding W3 of the switched reluctance generator and the third switching tube Sc in sequence and then returns to the negative end of the second capacitor Cb;
in the process, the voltage of the excitation power supply is used as the input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fifth switching tube Se are ignored, so that the excitation voltage of the switched reluctance generator is equal to the voltage UCb of the second capacitor Cb, and the excitation voltage of the switched reluctance generator is lower than the input voltage Ui;
3) the strong excitation control mode comprises the following steps: in a strong excitation control mode, a first switching tube Sa, a second switching tube Sb, a third switching tube Sc and a fourth switching tube Sd are controlled to be switched on, a fifth switching tube Se is controlled to be switched off, and a Buck-Boost converter works in a Boost state;
at this time, the path of the excitation current Ii is: starting from the positive end of the first capacitor Co, on the one hand, the current flows through the fourth switching tube Sd, the first phase winding W1 of the switched reluctance generator and the first switching tube Sa in sequence and then returns to the negative end of the second capacitor Cb, on the other hand, the current flows through the fourth switching tube Sd, the second phase winding W2 of the switched reluctance generator and the second switching tube Sb in sequence and then returns to the negative end of the second capacitor Cb, and on the third hand, the current flows through the fourth switching tube Sd, the third phase winding W3 of the switched reluctance generator and the third switching tube in sequence and then returns to the negative end of the second capacitor Cb;
in the process, the voltage of the excitation power supply is used as an input voltage Ui, and the on-state voltage drops of the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fourth switching tube Sd are ignored, so that the excitation voltage of the switched reluctance generator is equal to the sum of the voltage UCb of the second capacitor Cb and the voltage UCo of the first capacitor Co, and the excitation voltage of the switched reluctance generator is higher than the input voltage Ui;
4) a power generation control mode: in the power generation control mode, the switched reluctance generator generates electric energy;
the power generation control mode comprises two modes:
4.1) in the first power generation control mode, the fifth switching tube Se is controlled to be switched on, and the first switching tube Sa, the second switching tube Sb, the third switching tube Sc and the fourth switching tube Sd are controlled to be switched off;
at this time, the path of the generated current Io is: on one hand, the current flows from the negative end of a first phase winding W1 of the switched reluctance generator in sequence and then returns to the positive end of a first phase winding W1 of the switched reluctance generator after flowing through a first freewheeling diode Da, a first capacitor Co and a fifth switching tube Se, on the other hand, the current flows from the negative end of a second phase winding W2 of the switched reluctance generator in sequence and then returns to the positive end of a second phase winding W2 of the switched reluctance generator after flowing through a second freewheeling diode Db, a first capacitor Co and a fifth switching tube Se, and on the third hand, the current flows from the negative end of a third phase winding W3 of the switched reluctance generator in sequence and then returns to the positive end of a third phase winding W3 of the switched reluctance generator after flowing through a third freewheeling diode Dc, a first capacitor Co and a fifth switching tube Se;
in the process, the voltage UCo of the first capacitor Co is used as the output voltage Uo, and the demagnetization voltage of the switched reluctance generator is equal to the voltage UCo of the first capacitor Co by neglecting the on-state voltage drops of the fifth switching tube Se, the first freewheeling diode Da, the second freewheeling diode Db and the third freewheeling diode Dc;
4.2) in the second power generation control mode, the first switching tube Sa, the second switching tube Sb, the third switching tube Sc, the fourth switching tube Sd and the fifth switching tube Se are controlled to be switched off;
at this time, the path of the generated current Io is: on one hand, the current flows from the negative end of a first phase winding W1 of the switched reluctance generator in sequence through a first freewheeling diode Da, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of the first phase winding W1 of the switched reluctance generator, on the other hand, the current flows from the negative end of a second phase winding W2 of the switched reluctance generator in sequence through a second freewheeling diode Db, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of a second phase winding W2 of the switched reluctance generator, and on the third hand, the current flows from the negative end of a third phase winding W3 of the switched reluctance generator in sequence through a third freewheeling diode Dc, a first capacitor Co, a second capacitor Cb and a fourth freewheeling diode Dd and then returns to the positive end of a third phase winding W3 of the switched reluctance generator;
in the process, the voltage UCo of the first capacitor Co is used as the output voltage Uo, and the demagnetization voltage of the switched reluctance generator is equal to the sum of the voltage UCo of the first capacitor Co and the voltage UCb of the second capacitor Cb by neglecting the on-state voltage drops of the first freewheeling diode Da, the second freewheeling diode Db, the third freewheeling diode Dc and the fourth freewheeling diode Dd.
3. The method for controlling the power converter of the voltage-adjustable switched reluctance generator according to claim 2, wherein: the on-off control signal of the first switch tube Sa, the on-off control signal of the second switch tube Sb, the on-off control signal of the third switch tube Sc, the on-off control signal of the fourth switch tube Sd, the on-off control signal of the fifth switch tube Se and the on-off control signal of the sixth switch tube Sf are all provided by a PWM controller or a current chopping controller.
4. The method for controlling the power converter of the voltage-adjustable switched reluctance generator according to claim 2, wherein: the excitation power supply is commercial power or a storage battery.
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