CN113991938A - Single-phase switched reluctance generator cascade power generation system and control method thereof - Google Patents
Single-phase switched reluctance generator cascade power generation system and control method thereof Download PDFInfo
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- CN113991938A CN113991938A CN202111261543.5A CN202111261543A CN113991938A CN 113991938 A CN113991938 A CN 113991938A CN 202111261543 A CN202111261543 A CN 202111261543A CN 113991938 A CN113991938 A CN 113991938A
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- 238000010248 power generation Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 13
- 230000005284 excitation Effects 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims description 29
- 230000000737 periodic effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- 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
-
- 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
- H02P9/40—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of reluctance of magnetic circuit of generator
Abstract
The invention discloses a single-phase switch reluctance generator cascade power generation system in the technical field of off-grid power generation, which comprises: the system comprises a plurality of single-phase switched reluctance generators, a plurality of single-phase switched reluctance generators and a plurality of phase-locked loop generators, wherein the single-phase switched reluctance generators are cascaded together and staggered by a certain angle; the power converter is connected with the single-phase switched reluctance generators, control circuits matched with the single-phase switched reluctance generators in number are arranged in the power converter, and each control circuit comprises a power switch tube and a freewheeling diode and is used for controlling the excitation and the power generation of the single-phase switched reluctance generators; the DSP controller is connected with the power converter and the single-phase switch reluctance generator and used for collecting corresponding voltage and current signals and outputting driving signals to the driving circuit to control the power converter to work.
Description
Technical Field
The invention relates to the technical field of off-grid power generation, in particular to a generator power generation system.
Background
In an off-grid power generation system with a storage battery energy storage structure, such as a range extender for wind power generation, fuel oil power generation and new energy automobiles, a single generator is mostly used for generating power, and the single-machine capacity of the power generation system is large under the condition of high power, and the universality is not high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a single-phase switched reluctance generator cascade power generation system, which improves the universality of an off-grid power generation system with a storage battery and reduces the single-machine capacity of a high-power generation system.
The purpose of the invention is realized as follows: a single phase switched reluctance generator cascade power generation system comprising:
the system comprises a plurality of single-phase switched reluctance generators, a plurality of phase-locked loop generators and a plurality of phase-locked loop generators, wherein the single-phase switched reluctance generators are cascaded together and staggered by a certain angle;
the power converter is connected with the single-phase switched reluctance generators, control circuits matched with the single-phase switched reluctance generators in number are arranged in the power converter, and each control circuit comprises a power switch tube and a freewheeling diode and is used for controlling excitation and power generation of the single-phase switched reluctance generators;
and the DSP controller is connected with the power converter and the single-phase switch reluctance generator and is used for acquiring corresponding voltage and current signals and outputting a driving signal to the driving circuit to control the power converter to work.
As a further limitation of the present invention, the relation between the cascade staggering angle of the plurality of single-phase switched reluctance generators and the number of cascaded motors is =T/mWhereinTIs the periodic angle of the rotor of the motor,mthe number of cascaded motors.
As a further limitation of the present invention, each phase of the control circuit includes a power switch tube and a freewheeling diode, the drain of the switch tube is connected to the anode of the freewheeling diode and one end of the motor winding, the source of the switch tube is connected to the cathode of the main circuit, and the cathode of the freewheeling diode is connected in parallel with the cathodes of the freewheeling diodes of the other motors to serve as the output terminal.
As a further limitation of the present invention, the method for controlling the power converter to operate by the DSP controller specifically includes:
judging the output current of the motor winding, if the output current is lower than a set threshold value, closing a switch tube in a main circuit, increasing the current of the motor winding under the action of an excitation power supply, and disconnecting the switch tube when the current exceeds the set threshold value
A control method of a single-phase switched reluctance generator cascade power generation system comprises the following steps:
step 1) detecting the winding current of each generator;
step 2) controlling the power converter to work through the DSP controller, and specifically comprising the following steps:
step 2-1) outputting upper and lower double thresholds of current chopping of a motor winding according to a required generating voltage given value and an actual output voltage value, wherein when a switching tube is closed, the current of the motor winding gradually rises under the excitation of power voltage, and when the current exceeds a set upper threshold, the DSP controls the turn-off of a power converter by outputting a driving signal, and the switching tube is turned off;
step 2-2) after the switching tube is disconnected, in a non-power generation area, the current of a motor winding is reduced, and if the current of the winding of the switched reluctance generator is lower than a set chopping lower threshold value, the DSP controls the power converter to be switched on by outputting a driving signal; in the power generation area, when the power switch tube is in an off state, the generator can realize continuous current rise through back electromotive force, namely, the power generation working state, when the motor leaves the power generation area, the current of the motor can quickly fall, when the current is lower than a set lower threshold value, the switch tube is closed again, and the control is in a periodic state.
Compared with the prior art, the invention has the beneficial effects that:
1. the single-phase switched reluctance generator is formed by coaxially cascading a plurality of single-phase switched reluctance generators, so that the capacity of a single machine is reduced; the total capacity of the generator set can be adjusted by increasing or decreasing the number of the cascaded switched reluctance generator motors, and the number of the cascaded motor phases is not limited to a single phase, so that the capacity of a standby motor is reduced;
2. each motor works independently, one motor breaks down, and other motors run normally, so that the reliability is high;
3. staggered angle when each motor is coaxially cascadedθThe generation voltage and current ripple can be reduced;
4. the power converter adopts a novel structure, only one power switch tube and one freewheeling diode are needed in each phase, and the cost of the power generation system is low; the main circuit is provided with a modular structure, so that the operation of increasing and decreasing the generators is simple;
5. the universality of an off-grid power generation system with a storage battery is improved, and the single-machine capacity of a high-power generation system is reduced; the total power generation capacity can be adjusted by increasing or decreasing the number of the generators according to actual power requirements, the total power generation capacity is flexible and changeable, the power generation voltage can be controlled in a voltage closed loop mode by adjusting excitation, and an additional hardware voltage stabilizing device is not needed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a coaxial series structure diagram of a single-phase switched reluctance generator cascade power generation system used in the invention.
Fig. 2 is an optimized structure diagram of a single-phase switched reluctance generator cascade power generation system used in the invention.
FIG. 3 is a power converter topology of a single-phase switched reluctance generator cascade power generation system used in the present invention.
FIG. 4 is a prototype test platform of the cascade power generation system of the single-phase switched reluctance generator used in the invention.
FIG. 5 is the current waveform generated by the cascade power generation system of the single-phase switched reluctance generator used in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
A single-phase switched reluctance generator cascade power generation system as shown in fig. 1, comprising:
multiple single-phase switch reluctance generators, the rotors of two generators are cascaded by a coupling to stagger a certain angle
WhereinTIs the periodic angle of the rotor of the motor,mthe number of motors; in the embodiment, two single-phase 6/6 switched reluctance generators are cascaded, so that the motor rotors are staggered
The rotating shafts of the two single-phase switched reluctance generators are connected with a prime motor, and the prime motor is used for outputting power to simulate the power given by an engine to drag the two single-phase switched reluctance generators to work;
a power converter connected to the switched reluctance generator for controlling the operation of the switched reluctance generator andthe novel topological structure is adopted, as shown in fig. 3, each motor only needs one power switch tube and one fly-wheel diode, and one motor is taken as an example and comprises a power switch tube S1 and a fly-wheel diode D1, the drain electrode of the switch tube S1 is connected with the anode of the fly-wheel diode D1 and one end of the motor winding, the other end of the motor winding is connected with the anode of the main circuit to serve as an output terminal, the source electrode of the switch tube S1 is connected with the cathode of the main circuit, and the cathode of the fly-wheel diode D1 is connected with the cathodes of other motor fly-wheel diodes in parallel to serve as an output terminal; the main circuit adopts a modular structure, motor access nodes are reserved in topology for increasing the number of cascaded motors in the follow-up process, wherein K0, K1 and K2 are common nodes, and the number of phases of the motor in the follow-up process is not limited to a single phase; increase the firstnOne end of the motor winding is connected with a common connection point K0, and the other end of the motor winding is connected with a switch tube SnDrain electrode connection, switching tube SnThe source is connected with the common connection point K1 of the cathode of the main circuit, and the cathode of the freewheeling diode Dn is connected with the common connection point K2;
the DSP controller is connected with the power converter, corresponding voltage and current signals are collected through the voltage and current sensors, the DSP outputs driving signals to the driving circuit to control the power converter to work, and the method for controlling the power converter to work by the DSP controller specifically comprises the following steps:
taking the motor A as an example, judging the output current of the winding of the motor A, if the output current is lower than a set threshold value, closing a switch tube S1 in a main circuit, increasing the current of the winding of the motor under the action of an excitation power supply, and disconnecting the switch tube S1 when the current exceeds the set threshold value; detecting the current of a motor winding in real time, judging the relation with a threshold value, and controlling the on-off of a switching tube; the back electromotive force generated by the phase winding inductance descending area of the switched reluctance generator is utilized to realize the effective power generation of the motor; the other motors are controlled in the same manner as motor a.
Example 2
As shown in fig. 2, the difference from embodiment 1 is only that two generators are integrated, the coupling of the two generators can be removed, and the two generators are processed in a single housing by a shaft.
In order to visually embody the cascade power generation of a plurality of switched reluctance generators and optimize relevant parameters of the cascade power generation of the switched reluctance generators, a coupling transmission scheme of the switched reluctance generators is adopted in an experiment, so that the space of the whole system is increased. Subsequently, in order to reduce the waste of space and expand the advantages of the system, a plurality of switched reluctance generators are arranged in the same shell. Fig. 2 shows an optimized structure schematic diagram of a single-phase switched reluctance generator cascade generator.
Example 3
A control method of a single-phase switched reluctance generator cascade power generation system comprises the following steps:
step 1) detecting the winding current of each generator;
step 2) controlling the power converter to work through the DSP controller, and specifically comprising the following steps:
step 2-1) outputting upper and lower double thresholds of current chopping of a motor winding according to a required generating voltage given value and an actual output voltage value, wherein when a switching tube is closed, the current of the motor winding gradually rises under the excitation of power voltage, and when the current exceeds a set upper threshold, the DSP controls the turn-off of a power converter by outputting a driving signal, and the switching tube is turned off;
step 2-2) after the switching tube is disconnected, in a non-power generation area, the current of a motor winding is reduced, and if the current of the winding of the switched reluctance generator is lower than a set chopping lower threshold value, the DSP controls the power converter to be switched on by outputting a driving signal; in the power generation area, when the power switch tube is in an off state, the generator can realize continuous current rise through back electromotive force, namely, the power generation working state, when the motor leaves the power generation area, the current of the motor can quickly fall, when the current is lower than a set lower threshold value, the switch tube is closed again, and the control is in a periodic state.
As shown in fig. 4, in order to verify the effectiveness of the control method provided by the invention, a prototype test platform and a control platform are established, and two single-phase switched reluctance generators are coaxially connected in series; DSP TMS320F28335 is selected as the digital signal processor, and a driving circuit takes a driving optocoupler HCPL-3120 as a driving chip.
The generated current of each switched reluctance generator is detected by the LEM current sensor, and the waveform is shown in fig. 5. Fig. 5 shows current waveforms generated by the single-phase switched reluctance generator cascade generator at different speed segments and different excitation voltages, and it can be known from fig. 5 that the single-phase switched reluctance generator cascade generator can reduce the pulsation of the generated current at different speed segments and different excitation voltages by staggering the angles, thereby being beneficial to charging the storage battery.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A single phase switched reluctance generator cascade power generation system comprising:
the system comprises a plurality of single-phase switched reluctance generators, a plurality of phase-locked loop generators and a plurality of phase-locked loop generators, wherein the single-phase switched reluctance generators are cascaded together and staggered by a certain angle;
the power converter is connected with the single-phase switched reluctance generators, control circuits matched with the single-phase switched reluctance generators in number are arranged in the power converter, and each control circuit comprises a power switch tube and a freewheeling diode and is used for controlling excitation and power generation of the single-phase switched reluctance generators;
and the DSP controller is connected with the power converter and the single-phase switch reluctance generator and is used for acquiring corresponding voltage and current signals and outputting a driving signal to the driving circuit to control the power converter to work.
2. The cascaded single-phase switched reluctance generator power generation system of claim 1, wherein the cascade staggering angle of the plurality of single-phase switched reluctance generators and the number of cascaded motors have a relation of =T/mWhereinTIs the periodic angle of the rotor of the motor,mthe number of cascaded motors.
3. The cascaded power generation system of the single-phase switched reluctance generator as claimed in claim 1, wherein each phase of the control circuit comprises a power switch tube and a freewheeling diode, the drain of the switch tube is connected to the anode of the freewheeling diode and one end of the motor winding, the source of the switch tube is connected to the negative pole of the main circuit, and the cathode of the freewheeling diode is connected in parallel with the cathodes of the freewheeling diodes of the other motors to serve as the output terminal.
4. The control method of the single-phase switched reluctance generator cascade power generation system according to claim 1, wherein the method for controlling the power converter to work by the DSP controller is specifically as follows:
and judging the output current of the motor winding, if the output current is lower than a set threshold value, closing a switching tube in the main circuit, increasing the current of the motor winding under the action of an excitation power supply, and disconnecting the switching tube when the current exceeds the set threshold value.
5. A control method of a single-phase switched reluctance generator cascade power generation system using the single-phase switched reluctance generator cascade power generation system according to claim 1, comprising the steps of:
step 1) detecting the winding current of each generator;
step 2) controlling the power converter to work through the DSP controller, and specifically comprising the following steps:
step 2-1) outputting upper and lower double thresholds of current chopping of a motor winding according to a required generating voltage given value and an actual output voltage value, wherein when a switching tube is closed, the current of the motor winding gradually rises under the excitation of power voltage, and when the current exceeds a set upper threshold, the DSP controls the turn-off of a power converter by outputting a driving signal, and the switching tube is turned off;
step 2-2) after the switching tube is disconnected, in a non-power generation area, the current of a motor winding is reduced, and if the current of the winding of the switched reluctance generator is lower than a set chopping lower threshold value, the DSP controls the power converter to be switched on by outputting a driving signal; in the power generation area, when the power switch tube is in an off state, the generator can realize continuous current rise through back electromotive force, namely, the power generation working state, when the motor leaves the power generation area, the current of the motor can quickly fall, when the current is lower than a set lower threshold value, the switch tube is closed again, and the control is in a periodic state.
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| CN202111261543.5A CN113991938B (en) | 2021-10-27 | 2021-10-27 | Cascade power generation system of single-phase switch reluctance generator and control method thereof |
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| CN202111261543.5A CN113991938B (en) | 2021-10-27 | 2021-10-27 | Cascade power generation system of single-phase switch reluctance generator and control method thereof |
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