CN112039125A - ORC system based on switched reluctance motor and control method - Google Patents
ORC system based on switched reluctance motor and control method Download PDFInfo
- Publication number
- CN112039125A CN112039125A CN202011206492.1A CN202011206492A CN112039125A CN 112039125 A CN112039125 A CN 112039125A CN 202011206492 A CN202011206492 A CN 202011206492A CN 112039125 A CN112039125 A CN 112039125A
- Authority
- CN
- China
- Prior art keywords
- switched reluctance
- speed
- reluctance generator
- power
- voltage
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The application discloses ORC system and control method based on switched reluctance motor belongs to the waste heat power generation field, the ORC system includes: the system comprises a heat circulation system, a high-speed switched reluctance motor and a power electronic system; the heat circulation system consists of an evaporator, a waste heat water pipeline, a working medium pump, a cooling water pump, a condenser, a motor cooling water pipeline and a turbine; the power electronic system consists of a high-speed switch reluctance generator power converter, a grid-connected converter and a controller. The heat cycle system has the main functions of converting waste heat energy into heat energy of a cycle working medium, and the gaseous cycle working medium enters a turbine to push an impeller to rotate to do work; the high-speed switched reluctance generator converts the mechanical energy of the turbine impeller into electric energy; the power electronic system is used for converting the high-frequency voltage of the motor into electric energy with the frequency consistent with the voltage frequency of a power grid. The problems that an existing ORC system is difficult to directly drive large-range variable speed operation, low in reliability, complex in design, manufacture and control, high in cost and the like can be effectively solved.
Description
Technical Field
The application relates to the technical field of waste heat power generation, in particular to an ORC system based on a switched reluctance motor and a control method.
Background
The existing ORC system mainly adopts an asynchronous motor and a permanent magnet synchronous motor as generators, the asynchronous generator can only adjust the rotating speed of the motor in a small range, a speed-up gear box is required to be installed when the ORC system is used, the requirement that the generator can realize large-range variable speed direct drive cannot be obviously met, the asynchronous motor is complex in design, manufacture and operation control and low in generating efficiency at low speed, the permanent magnet material required by the permanent magnet synchronous motor is poor in anti-seismic performance and is easily influenced by temperature, and the risk of demagnetization caused by high temperature or occasional short-circuit current exists, so that the reliability is low, the motor is difficult to manufacture, the permanent magnet synchronous motor needs to use a large amount of rare earth resources, and along with the large consumption of the rare earth resources in China, the product cost of the permanent magnet synchronous motor is gradually increased and the.
The electricity generated by the asynchronous generator and the permanent magnet synchronous generator is alternating current, the frequency of the output alternating current is correspondingly improved along with the increase of the rotating speed, and the driving frequency of the rectification IGBT is also improved along with the increase of the driving frequency. The formula for calculating the frequency of the output alternating current of the synchronous generator is f = P x n/60, and the formula for calculating the frequency of the output alternating current of the asynchronous generator is f = (P x n/60) × (1-s), wherein: f is the frequency of the alternating current output by the generator; n is the rotating speed of the generator rotor; p is the pole pair number of the generator; and s is the slip ratio of the asynchronous motor, and the value range is 1.5-5%.
Taking the synchronous generator as an example, if the output speed of the synchronous generator is 40000r/min, the number of pole pairs is 2, the output alternating current frequency is f =2 × 4000/60=1333.33HZ, and the rectified IGBT driving frequency is calculated 400 times per alternating current frequency carrier, so as to obtain the IGBT driving frequency: f. ofPWM=1333.33 × 400=533333.33HZ ≈ 533 kHZ. And IGBT driving frequency fPWMThe voltage does not exceed 100kHZ, so that the synchronous motor and the asynchronous motor are difficult to be applied to high-speed power generation occasions with more than tens of thousands of turns.
Disclosure of Invention
In order to solve the technical problems, the following technical scheme is provided:
in a first aspect, an embodiment of the present application provides a switched reluctance motor-based ORC system, including: the system comprises a heat circulation system, a high-speed switched reluctance generator and a power electronic system, wherein the high-speed switched reluctance generator is respectively connected with the heat circulation system and the power electronic system; wherein the power electronics system comprises: the power converter of the high-speed switched reluctance generator, the grid-connected converter and the controller; the output end of the high-speed switched reluctance generator is electrically connected with the input end of the power converter of the high-speed switched reluctance generator, the grid-connected converter is respectively connected with the output end of the power converter of the high-speed switched reluctance generator and the power grid side, and the controller is respectively electrically connected with the high-speed switched reluctance generator, the power converter of the high-speed switched reluctance generator and the grid-connected converter.
By adopting the implementation mode, the heat circulation system converts waste heat energy into mechanical energy to drive the high-speed switch reluctance generator to rotate; the high-speed switched reluctance generator converts mechanical energy into electric energy and sends the electric energy into a power converter of the high-speed switched reluctance generator; the power electronic system is responsible for energy conversion of the whole system; the power converter of the high-speed switch reluctance generator converts periodically-changed voltage emitted by the high-speed switch reluctance generator into constant direct current, and discharges redundant energy when the voltage of a direct current bus is overvoltage; the grid-connected converter converts the direct current into electric energy with the same voltage frequency as the power grid and is connected to the power grid; and the controller controls the power converter of the high-speed switched reluctance generator and the grid-connected converter to perform power conversion. The problems that an existing ORC system is difficult to directly drive large-range variable speed operation, low in reliability, complex in design, manufacture and control, high in cost and the like can be effectively solved.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the power electronic system further includes: the system comprises an encoder, a generator voltage and current sampling circuit, a motor driving circuit, a bus voltage sampling circuit, a rectifier driving circuit and a network side voltage and current sampling circuit; the encoder is respectively electrically connected with the high-speed switch reluctance generator and the controller, the generator voltage and current sampling circuit is respectively electrically connected with the output end of the high-speed switch reluctance generator and the controller, the motor driving circuit is respectively electrically connected with the high-speed switch reluctance generator power converter and the controller, the bus voltage sampling circuit is respectively electrically connected with the output end of the high-speed switch reluctance generator power converter and the controller, the rectifier driving circuit is respectively electrically connected with the grid-connected converter and the controller, and the grid-side voltage and current sampling circuit is respectively electrically connected with the output end of the grid-connected converter and the controller.
The encoder acquires the rotating speed and position information of the high-speed switched reluctance generator; the generator voltage and current sampling circuit collects voltage and current information of the output end of the high-speed switched reluctance generator; the motor driving circuit drives the power converter of the high-speed switched reluctance generator to convert the periodically-changed voltage generated by the high-speed switched reluctance generator into constant direct current, and redundant energy is released when the voltage of a direct current bus is over-voltage; the bus voltage sampling circuit collects bus voltage; the rectifier driving circuit drives the grid-connected converter to transmit energy to a power grid; and the network side voltage and current sampling circuit acquires the voltage and current of the three-phase alternating current at the network side.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the thermal cycle system includes: evaporimeter, waste heat water pipe way, working medium pump, cooling water pump, valve, condenser, motor cooling water piping and turbine, the evaporimeter respectively with the first end of waste heat water pipe way, working medium pump and the first end of turbine are connected, the condenser respectively with the second end of turbine the second end of working medium pump with cooling water pump is connected, motor cooling water piping one end with cooling water pump is connected, and the other end is connected with high-speed switch reluctance generator's cooling system, the valve sets up on the connecting pipeline in heat-cycle system.
The heat circulation system converts heat energy in waste heat water into heat energy of a circulation working medium, the waste heat water enters the evaporator through a waste heat water pipeline and fully exchanges heat with the liquid circulation working medium, the gaseous circulation working medium enters the turbine to push the impeller to rotate to do work, the temperature of the circulation working medium after doing work is reduced, the circulation working medium enters the condenser to exchange heat with cooling water and then is liquefied, and the liquefied circulation working medium is pumped into the evaporator again by the working medium pump to perform a new cycle of circulation; the high-speed switched reluctance generator converts mechanical energy of a turbine impeller into electric energy, and the turbine impeller directly drives a rotor of the high-speed switched reluctance generator to rotate at a high speed to generate electric energy in a motor winding.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the power converter of the high-speed switched reluctance generator employs an asymmetric half-bridge circuit, each phase includes two main switching devices and two freewheeling diodes, and the a phase is composed of a switching device Q1, a switching device Q2, a freewheeling diode D1, a freewheeling diode D2, and is connected to two ends, a + and a-, of a phase winding of the high-speed switched reluctance generator; the phase B consists of switching devices Q3 and Q4 and freewheeling diodes D3 and D4 and is connected to the two ends of the phase B + and the phase B-of the high-speed switched reluctance generator; the C phase consists of switching devices Q5 and Q6 and freewheeling diodes D5 and D6 and is connected to the two ends of C + and C-of the C phase winding of the high-speed switched reluctance generator in parallel, the switching devices Q13 and R are connected in series to form a discharge circuit of the power converter of the high-speed switched reluctance generator, when the direct-current bus voltage is overhigh, redundant energy is discharged through Q13 and R, and C is dischargedDCIs a filter capacitor and is connected with the bleeder circuit in parallel.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the grid-connected converter is a two-level PWM rectifier, and is composed of switching devices Q7, Q8, Q9, Q10, Q11, and Q12, the switching devices Q7 and Q8 are connected in series to form a first rectification circuit, the switching devices Q9 and Q10 are connected in series to form a second rectification circuit, the switching devices Q11 and Q12 are connected in series to form a third rectification circuit, and the first rectification circuit, the second rectification circuit, and the third rectification circuit are connected in parallel, and are controlled by adopting fixed switching frequency control, hysteresis control, or loss control.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the grid-connected converter adopts a three-level or multi-level topology structure, and a control manner of the grid-connected converter adopts fixed switching frequency control, hysteresis control or loss control.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the controller includes a main control board, a touch screen, and a control power source, where the control power source is electrically connected to the main control board and the touch screen, and the main control board is electrically connected to the touch screen and the power converter of the off-reluctance generator.
The control power supply provides power for the main control board and the touch screen; the main control board controls the power converter of the switched reluctance generator to convert periodic voltage sent by the high-speed switched reluctance generator into direct current and controls the voltage of a direct current bus to be constant; the touch screen realizes the man-machine interaction of the whole system.
With reference to the third possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the switched reluctance generator power converter circuit form further includes: a double winding type or a capacitance voltage division type or a common switch type or a capacitance dump type.
In a second aspect, an embodiment of the present application provides a method for controlling an ORC system based on a switched reluctance motor, where the method for controlling an ORC system based on a switched reluctance motor according to the first aspect or any one of the possible implementations of the first aspect includes: starting a heat cycle system, and starting the ORC system to work; the heat circulation system converts the heat energy in the waste heat water into the heat energy of the circulation working medium, the gaseous circulation working medium enters the turbine to push the impeller to rotate to do work, and the heat energy is converted into mechanical energy; the high-speed switched reluctance generator converts the mechanical energy into electric energy and sends the electric energy into a power converter of the high-speed switched reluctance generator; the controller drives the power converter of the high-speed switched reluctance generator to generate power, and firstly, the reference value of the running rotating speed of the high-speed switched reluctance generator is set asω *(ii) a The controller collects the output pulse of the encoder in real time through the encoder according to a formulaω=60M 1 /PT c Orω=60f 0 /M 2 Calculating the rotation speed of the motorω(ii) a Wherein:Pthe number of pulses output for each revolution of the encoder,M 1 is time of dayT c The number of pulses output by the inner encoder,f 0 is a high frequency clock pulse frequency and is,M 2 the number of high-frequency clock pulses reflecting the speed measuring time; according to the formula Δω=ω * - ωCalculating speed deviation, and then based on power curve method or climbing mountainObtaining the reference current value of the current loop by the maximum power tracking algorithm of the search methodI * (ii) a The controller collects the current sent by the high-speed switch reluctance generator in real time through the current sampling circuit of the generatori (t)(ii) a According to the formula Δi=I * -i(t)A, B, C three-phase current deviation is calculated, and then A, B, C three-phase control parameters are obtained through PID regulationI A、I B 、I C (ii) a According to control parametersI A0、I B0 、I C0 Rotational speed of the motorωPosition feedback is carried out to generate control signals PWMA, PWMB and PWMC with positions and angles, and a motor driving circuit drives a power converter of the high-speed switched reluctance generator to work in a maximum power generation state; the controller controls the grid-connected converter to incorporate the power generation energy into the power grid, and firstly, the controller collects the bus voltage in real time through the bus voltage sampling circuitv dc (t)(ii) a If the voltage of the bus is too high, the redundant energy of the bus is discharged through a discharge circuit; the controller collects the three-phase alternating-current voltage of the network side in real time through the network side voltage and current sampling circuitv s (t)、Alternating currenti s (t)，And digital phase locking is carried out through three-phase alternating-current voltage; according to the formula Δv dc =v dc * -v dc (t)Calculating the voltage deviation of the direct current bus, and obtaining the reference current value of the current loop through PID regulationI s * (ii) a According to the formula Δi s =I s * -i s (t)Calculating current deviation, and obtaining U, V, W three-phase feedback parameters through PID regulationv uo 、v vo 、v wo (ii) a According to the formulaV=v s (t)-v o U, V, W three-phase control parameters are calculatedV u 、V v 、V w (ii) a According to control parametersV u 、V v 、V w Generating control signals PWMU, PWMV and PWMW, driving a grid-connected rectifier through a rectifier driving circuit to enable energy to be merged into a three-phase power grid, and simultaneously controlling the voltage of a direct-current bus to be stable; judging whether the ORC system is closed or not, and returning to the second step if the ORC system is not closed; the ORC system stops operating.
Drawings
Fig. 1 is a schematic diagram of a frame of a switched reluctance motor-based ORC system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an ORC system based on a switched reluctance motor according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a control method of an ORC system based on a switched reluctance motor according to an embodiment of the present application;
in fig. 1-3, the symbols are represented as:
the system comprises a heat circulation system 1, a high-speed switched reluctance generator 2, a power electronic system 3, a high-speed switched reluctance generator power converter 4, a grid-connected converter 5, a controller 6, an encoder 7, a generator voltage and current sampling circuit 8, a motor driving circuit 9, a bus voltage sampling circuit 10, a rectifier driving circuit 11, a grid side voltage and current sampling circuit 12, an evaporator 13, a waste heat water pipeline 14, a working medium pump 15, a cooling water pump 16, a valve 17, a condenser 18, a motor cooling water pipeline 19, a turbine 20, a main control board 21, a touch screen 22 and a control power supply 23.
Detailed Description
The present embodiment is described below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic diagram of a framework of a switched reluctance motor-based ORC system according to an embodiment of the present invention, and referring to fig. 1, the switched reluctance motor-based ORC system according to the present embodiment includes: the system comprises a heat cycle system 1, a high-speed switched reluctance generator 2 and a power electronic system 3, wherein the high-speed switched reluctance generator 2 is respectively connected with the heat cycle system 1 and the power electronic system 3; wherein the power electronics system 3 comprises: the power converter 4 of the high-speed switched reluctance generator, the grid-connected converter 5 and the controller 6.
The output end of the high-speed switched reluctance generator 2 is electrically connected with the input end of the high-speed switched reluctance generator power converter 4, the grid-connected converter 5 is respectively connected with the output end of the high-speed switched reluctance generator power converter 4 and the power grid side, and the controller 6 is respectively electrically connected with the high-speed switched reluctance generator 2, the high-speed switched reluctance generator power converter 4 and the grid-connected converter 5.
The heat circulation system 1 converts waste heat energy into mechanical energy to drive the high-speed switched reluctance generator 2 to rotate; the high-speed switched reluctance generator 2 converts mechanical energy into electric energy and sends the electric energy into a power converter 4 of the high-speed switched reluctance generator; the power electronic system 3 is responsible for energy conversion of the whole system; the power converter 4 of the high-speed switch reluctance generator converts the periodically-changed voltage generated by the high-speed switch reluctance generator 2 into constant direct current, and discharges redundant energy when the voltage of a direct current bus is overvoltage; the grid-connected converter 5 converts the direct current into electric energy with the same voltage frequency as the power grid and is connected to the power grid; and the controller 6 controls the power converter 4 of the high-speed switched reluctance generator and the grid-connected converter 5 to carry out power conversion.
The power electronics system 3 further comprises: the system comprises an encoder 7, a generator voltage and current sampling circuit 8, a motor driving circuit 9, a bus voltage sampling circuit 10, a rectifier driving circuit 11 and a network side voltage and current sampling circuit 12; the encoder 7 is respectively electrically connected with the high-speed switch reluctance generator 2 and the controller 6, the generator voltage and current sampling circuit 8 is respectively electrically connected with the output end of the high-speed switch reluctance generator 2 and the controller 6, the motor driving circuit 9 is respectively electrically connected with the high-speed switch reluctance generator power converter 4 and the controller 6, the bus voltage sampling circuit 10 is respectively electrically connected with the output end of the high-speed switch reluctance generator power converter 4 and the controller 6, the rectifier driving circuit 11 is respectively electrically connected with the grid-connected converter 5 and the controller 6, and the grid-side voltage and current sampling circuit 12 is respectively electrically connected with the output end of the grid-connected converter 5 and the controller 6.
The encoder 7 acquires the rotating speed and position information of the high-speed switched reluctance generator 2; the generator voltage and current sampling circuit 8 is used for acquiring voltage and current information of the output end of the high-speed switched reluctance generator 2; the motor driving circuit 9 drives the power converter 4 of the high-speed switched reluctance generator to convert the periodically-changed voltage generated by the high-speed switched reluctance generator 2 into constant direct current, and redundant energy is released when the voltage of a direct current bus is overvoltage; the bus voltage sampling circuit 10 collects bus voltage; the rectifier driving circuit 11 drives the grid-connected converter 5 to transmit energy to a power grid; the network side voltage and current sampling circuit 12 collects the voltage and current of the three-phase network side alternating current.
Referring to fig. 2, the heat cycle system 1 includes: evaporator 13, waste heat water pipe 14, working medium pump 15, cooling water pump 16, valve 17, condenser 18, motor cooling water pipeline 19 and turbine 20, evaporator 13 respectively with waste heat water pipe 14, working medium pump 15's first end and turbine 20's first end are connected, condenser 18 respectively with turbine 20's second end working medium pump 15's second end with cooling water pump 16 is connected, motor cooling water pipeline 19 one end with cooling water pump 16 is connected, and the other end is connected with the cooling system of high-speed switch reluctance generator 2, valve 17 sets up on the connecting pipeline in heat-cycle system 1.
The heat circulation system 1 converts heat energy in waste heat water into heat energy of a circulation working medium, the waste heat water enters the evaporator 13 through a waste heat water pipeline 14 and fully exchanges heat with the liquid circulation working medium, the gaseous circulation working medium enters the turbine 20 to push the impeller to rotate to do work, the temperature of the circulation working medium after doing work is reduced, the circulation working medium enters the condenser 18 to exchange heat with cooling water and then is liquefied, and the liquefied circulation working medium is pumped into the evaporator 13 again by the working medium pump 15 to perform a new round of circulation; the high-speed switched reluctance generator 2 converts the mechanical energy of the impeller of the turbine 20 into electric energy, and the impeller of the turbine 20 directly drives the rotor of the high-speed switched reluctance generator 2 to rotate at a high speed to generate electric energy in the motor winding.
The power converter 4 of the high-speed switched reluctance generator adopts an asymmetric half-bridge circuit, and each phase comprises two main switching devices and two follow currentsThe A phase consists of switching devices Q1 and Q2 and freewheeling diodes D1 and D2 and is connected to the two ends of A + and A-of the A phase winding of the high-speed switched reluctance generator 2; the B phase consists of switching devices Q3 and Q4 and freewheeling diodes D3 and D4 and is connected to the two ends of the B + and B-of the B phase winding of the high-speed switched reluctance generator 2; the C phase consists of switching devices Q5 and Q6 and freewheeling diodes D5 and D6 and is connected to the two ends of C + and C-of the C phase winding of the high-speed switched reluctance generator 2 in parallel, the switching devices Q13 and R are connected in series to form a discharge circuit of the power converter 4 of the high-speed switched reluctance generator, when the direct-current bus voltage is overhigh, redundant energy is discharged through Q13 and R, and C is dischargedDCIs a filter capacitor and is connected with the bleeder circuit in parallel.
The grid-connected converter 5 is a two-level PWM rectifier and comprises switching devices Q7, Q8, Q9, Q10, Q11 and Q12, the switching devices Q7 and Q8 are connected in series to form a first rectifying circuit, the switching devices Q9 and Q10 are connected in series to form a second rectifying circuit, the switching devices Q11 and Q12 are connected in series to form a third rectifying circuit, and the first rectifying circuit, the second rectifying circuit and the third rectifying circuit are connected in parallel.
In this embodiment, the grid-connected converter 5 adopts a three-level or multi-level topology structure, and the control mode thereof is stepped by adopting fixed switching frequency control, hysteresis control or loss control.
The controller 6 comprises a main control board 21, a touch screen 22 and a control power supply 23, wherein the control power supply 23 is respectively electrically connected with the main control board 21 and the touch screen 22, and the main control board 21 is respectively electrically connected with the touch screen 22 and the power converter of the switched reluctance generator. The control power supply 23 supplies power to the main control board 21 and the touch screen 22, the main control board 21 controls the power converter of the switched reluctance generator to convert periodic voltage sent by the high-speed switched reluctance generator 2 into direct current, the voltage of a direct current bus is controlled to be constant, and the touch screen 22 realizes man-machine interaction of the whole system.
The circuit form of the switched reluctance generator power converter in the embodiment further comprises: a double winding type or a capacitance voltage division type or a common switch type or a capacitance dump type.
Corresponding to the ORC system based on the switched reluctance motor provided in the foregoing embodiment, the present application also provides a control method of the ORC system based on the switched reluctance motor, referring to fig. 3, where the method includes:
s101, starting the heat cycle system 1, and starting the ORC system to work.
S102, the heat circulation system 1 converts heat energy in the waste heat water into heat energy of a circulation working medium, the gaseous circulation working medium enters the turbine 20, the impeller is pushed to rotate to do work, and the heat energy is converted into mechanical energy.
And S103, converting the mechanical energy into electric energy by the high-speed switched reluctance generator 2, and sending the electric energy into the power converter 4 of the high-speed switched reluctance generator.
S104, the controller 6 drives the power converter 4 of the high-speed switched reluctance generator to generate power, and firstly, the reference value of the running rotating speed of the high-speed switched reluctance generator 2 is set asω *。
S105, the controller 6 collects the output pulse of the encoder 7 in real time through the encoder 7 according to a formulaω=60M 1 /PT c Orω=60f 0 /M 2 Calculating the rotation speed of the motorω(ii) a Wherein:Pthe number of pulses output for each revolution of the encoder 7,M 1 is time of dayT c The number of pulses output by the inner encoder 7,f 0 is a high frequency clock pulse frequency and is,M 2 the number of the high-frequency clock pulses for reflecting the speed measuring time.
S106, according to the formula Deltaω=ω * -ωCalculating speed deviation, and then obtaining the reference current value of the current loop based on the maximum power tracking algorithm of a power curve method or a hill climbing search methodI * 。
S107, the controller 6 collects the current generated by the high-speed switched reluctance generator 2 in real time through the generator current sampling circuiti(t)。
S108, according to the formula Deltai=I * -i(t)A, B, C three-phase current deviation is calculated, and then A, B, C three-phase control parameters are obtained through PID regulationI A、I B 、I C 。
S109, according to the control parameterI A0、I B0 、I C0 Rotational speed of the motorωAnd position feedback generates control signals PWMA, PWMB and PWMC with position and angle, and drives the power converter 4 of the high-speed switch reluctance generator to work in the maximum power generation state through the motor driving circuit 9.
S1010, the controller 6 controls the grid-connected converter 5 to enable the generated energy to be merged into a power grid, and firstly, the controller 6 collects bus voltage in real time through the bus voltage sampling circuit 10v dc (t)。
And S1011, if the bus voltage is too high, discharging the redundant energy of the bus through a discharge circuit.
S1012, the controller 6 collects the three-phase alternating-current voltage of the network side in real time through the network side voltage and current sampling circuit 12v s (t)、Alternating currenti s (t)，And digital phase locking is performed by three-phase alternating voltage.
S1013, according to the formula Δv dc =v dc * -v dc (t)Calculating the voltage deviation of the direct current bus, and obtaining the reference current value of the current loop through PID regulationI s * 。
S1014, according to the formula Deltai s =I s * -i s (t)Calculating current deviation, and obtaining U, V, W three-phase feedback parameters through PID regulationv uo 、v vo 、v wo 。
S1015, according to the formulaV=v s (t)-v o U, V, W three-phase control parameters are calculatedV u 、V v 、V w ；
S1016, according to the control parameterV u 、V v 、V w Generates control signals PWMU,PWMV, PWMW, drive the grid-connected rectifier through rectifier drive circuit 11 and merge the energy into the three-phase electric wire netting, control direct current bus voltage simultaneously and stabilize.
S1017, judging whether the ORC system is closed or not, and if not, returning to S102.
S1018, the ORC system stops operating.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features that are not described in this application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present application and not for limiting the present application, and the present application is only described in detail with reference to the preferred embodiments instead, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present application may be made by those skilled in the art without departing from the spirit of the present application, and the scope of the claims of the present application should also be covered.
Claims (9)
1. An ORC system based on a switched reluctance motor, comprising: the system comprises a heat circulation system, a high-speed switched reluctance generator and a power electronic system, wherein the high-speed switched reluctance generator is respectively connected with the heat circulation system and the power electronic system; wherein the power electronics system comprises: the power converter of the high-speed switched reluctance generator, the grid-connected converter and the controller; the output end of the high-speed switched reluctance generator is electrically connected with the input end of the power converter of the high-speed switched reluctance generator, the grid-connected converter is respectively connected with the output end of the power converter of the high-speed switched reluctance generator and the power grid side, and the controller is respectively electrically connected with the high-speed switched reluctance generator, the power converter of the high-speed switched reluctance generator and the grid-connected converter.
2. The switched reluctance motor based ORC system of claim 1 wherein the power electronics system further comprises: the system comprises an encoder, a generator voltage and current sampling circuit, a motor driving circuit, a bus voltage sampling circuit, a rectifier driving circuit and a network side voltage and current sampling circuit; the encoder is respectively electrically connected with the high-speed switch reluctance generator and the controller, the generator voltage and current sampling circuit is respectively electrically connected with the output end of the high-speed switch reluctance generator and the controller, the motor driving circuit is respectively electrically connected with the high-speed switch reluctance generator power converter and the controller, the bus voltage sampling circuit is respectively electrically connected with the output end of the high-speed switch reluctance generator power converter and the controller, the rectifier driving circuit is respectively electrically connected with the grid-connected converter and the controller, and the grid-side voltage and current sampling circuit is respectively electrically connected with the output end of the grid-connected converter and the controller.
3. The switched reluctance motor based ORC system of claim 1 wherein the thermal cycle system comprises: evaporimeter, waste heat water pipe way, working medium pump, cooling water pump, valve, condenser, motor cooling water piping and turbine, the evaporimeter respectively with the first end of waste heat water pipe way, working medium pump and the first end of turbine are connected, the condenser respectively with the second end of turbine the second end of working medium pump with cooling water pump is connected, motor cooling water piping one end with cooling water pump is connected, and the other end is connected with high-speed switch reluctance generator's cooling system, the valve sets up on the connecting pipeline in heat-cycle system.
4. The switched reluctance motor based ORC system of claim 1, wherein the high speed switched reluctance generator power converter employs an asymmetric half bridge circuit, each phase comprising two main switching devices and two freewheeling diodes, the a phase consisting of switching devices Q1, Q2 and freewheeling diodes D1, D2 and connected across a + and a-of the a phase winding of the high speed switched reluctance generator; the phase B consists of switching devices Q3 and Q4 and freewheeling diodes D3 and D4 and is connected to the two ends of the phase B + and the phase B-of the high-speed switched reluctance generator; the C phase consists of switching devices Q5 and Q6 and freewheeling diodes D5 and D6 and is connected to the two ends of C + and C-of the C phase winding of the high-speed switched reluctance generator in parallel, the switching devices Q13 and R are connected in series to form a discharge circuit of the power converter of the high-speed switched reluctance generator, when the direct-current bus voltage is overhigh, redundant energy is discharged through Q13 and R, and C is dischargedDCIs a filter capacitor and is connected with the bleeder circuit in parallel.
5. The switched reluctance motor based ORC system of claim 1, wherein the grid-connected converter is a two-level PWM rectifier, and is composed of switching devices Q7, Q8, Q9, Q10, Q11, Q12, the switching devices Q7 and Q8 are connected in series to form a first rectifying circuit, the switching devices Q9 and Q10 are connected in series to form a second rectifying circuit, the switching devices Q11 and Q12 are connected in series to form a third rectifying circuit, and the first, second and third rectifying circuits are connected in parallel, and are controlled by using a fixed switching frequency control or a hysteresis control or a loss control.
6. The switched reluctance motor based ORC system of claim 1, wherein the grid-tied converter uses a three-level or multi-level topology, and the control mode thereof is stepped by fixed switching frequency control or hysteresis control or loss control.
7. The switched reluctance motor based ORC system of claim 1, wherein the controller comprises a main control board, a touch screen, and a control power supply, the control power supply being electrically connected to the main control board and the touch screen, respectively, the main control board being electrically connected to the touch screen and the switched reluctance generator power converter, respectively;
the control power supply provides power for the main control board and the touch screen; the main control board controls the power converter of the switched reluctance generator to convert periodic voltage sent by the high-speed switched reluctance generator into direct current and controls the voltage of a direct current bus to be constant; the touch screen realizes the man-machine interaction of the whole system.
8. The switched reluctance motor based ORC system of claim 4 wherein the switched reluctance generator power converter circuit form further comprises: a double winding type or a capacitance voltage division type or a common switch type or a capacitance dump type.
9. A switched reluctance motor based ORC system control method, characterized in that the switched reluctance motor based ORC system of any of claims 1-8 is used, the method comprising:
starting a heat cycle system, and starting the ORC system to work;
the heat circulation system converts the heat energy in the waste heat water into the heat energy of the circulation working medium, the gaseous circulation working medium enters the turbine to push the impeller to rotate to do work, and the heat energy is converted into mechanical energy;
the high-speed switched reluctance generator converts the mechanical energy into electric energy and sends the electric energy into a power converter of the high-speed switched reluctance generator;
the controller drives the power converter of the high-speed switched reluctance generator to generate power, and firstly, the reference value of the running rotating speed of the high-speed switched reluctance generator is set to be omega*；
The controller collects the output pulse of the encoder in real time through the encoder according to the formula omega =60M1/PTcOr ω =60f0/M2Calculating the rotating speed omega of the motor; wherein: p is the number of pulses output by the encoder per revolution, M1Is a time TcNumber of pulses output by the inner encoder, f0At a high clock frequency, M2The number of high-frequency clock pulses reflecting the speed measuring time;
according to the formula Δ ω = ω*Calculating speed deviation by omega, and then obtaining a reference current value I of a current loop based on a maximum power tracking algorithm of a power curve method or a hill climbing search method*；
The controller collects the current i (t) sent by the high-speed switch reluctance generator in real time through a generator current sampling circuit;
according to the formula Δ I = I*I (t) calculating A, B, C three-phase current deviation, and obtaining A, B, C three-phase control parameter I through PID regulationA、IB、IC；
According to the control parameter IA0、IB0、IC0The rotation speed omega and the position feedback generate control signals PWMA, PWMB and PWMC with position and angle, and a motor driving circuit drives a power converter of the high-speed switched reluctance generator to work in a maximum power generation state;
the controller controls the grid-connected converter to incorporate the power generation energy into the power grid, and firstly, the controller collects the bus voltage v in real time through the bus voltage sampling circuitdc(t)；
If the voltage of the bus is too high, the redundant energy of the bus is discharged through a discharge circuit;
the controller collects the three-phase alternating-current voltage v of the network side in real time through the network side voltage and current sampling circuits(t) alternating Current is(t) and performing digital phase locking by three-phase alternating current voltage;
according to the formula Δ vdc=vdc *-vdc(t) calculating the voltage deviation of the direct current bus, and obtaining the reference current value I of the current loop through PID regulations *；
According to the formula Δ is=Is *-is(t) calculating current deviation, and obtaining U, V, W three-phase inverse through PID regulationFeed quantity vuo、vvo、vwo；
According to the formula V = Vs(t)-voU, V, W three-phase control parameter V is calculatedu、Vv、Vw；
According to a control parameter Vu、Vv、VwGenerating control signals PWMU, PWMV and PWMW, driving a grid-connected rectifier through a rectifier driving circuit to enable energy to be merged into a three-phase power grid, and simultaneously controlling the voltage of a direct-current bus to be stable;
judging whether the ORC system is closed or not, and returning to the second step if the ORC system is not closed;
the ORC system stops operating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206492.1A CN112039125A (en) | 2020-11-03 | 2020-11-03 | ORC system based on switched reluctance motor and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206492.1A CN112039125A (en) | 2020-11-03 | 2020-11-03 | ORC system based on switched reluctance motor and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112039125A true CN112039125A (en) | 2020-12-04 |
Family
ID=73573605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011206492.1A Pending CN112039125A (en) | 2020-11-03 | 2020-11-03 | ORC system based on switched reluctance motor and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112039125A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582671A (en) * | 2009-06-23 | 2009-11-18 | 南京航空航天大学 | Power converter for switch reluctance starter/generator |
| CN102355188A (en) * | 2011-10-09 | 2012-02-15 | 西安交通大学 | Tuning control algorithm of mutual inductance coupling linear switched reluctance wave generator |
| CN103883372A (en) * | 2013-12-31 | 2014-06-25 | 湖南齐力达电气科技有限公司 | Symmetric dual-drive low-temperature waste heat power generation system |
| CN104037796A (en) * | 2013-12-31 | 2014-09-10 | 湖南齐力达电气科技有限公司 | Grid-connected type multi-loop low temperature waste heat power generation system |
| CN105241259A (en) * | 2015-10-12 | 2016-01-13 | 中国矿业大学 | Uninterrupted calcium carbide furnace afterheat recovery control system and method |
| CN105811848A (en) * | 2016-03-21 | 2016-07-27 | 太原理工大学 | Proportional integral (PI) control method for variable gain of switched reluctance motor |
| CN107947672A (en) * | 2017-11-27 | 2018-04-20 | 中国矿业大学 | A kind of wide speed range switched reluctance motor system efficiency optimization control method |
| CN111404436A (en) * | 2020-04-30 | 2020-07-10 | 西安交通大学 | Controller and method for double-armature winding multiple electromagnetic torque single-stator single-rotor reluctance motor |
-
2020
- 2020-11-03 CN CN202011206492.1A patent/CN112039125A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582671A (en) * | 2009-06-23 | 2009-11-18 | 南京航空航天大学 | Power converter for switch reluctance starter/generator |
| CN102355188A (en) * | 2011-10-09 | 2012-02-15 | 西安交通大学 | Tuning control algorithm of mutual inductance coupling linear switched reluctance wave generator |
| CN103883372A (en) * | 2013-12-31 | 2014-06-25 | 湖南齐力达电气科技有限公司 | Symmetric dual-drive low-temperature waste heat power generation system |
| CN104037796A (en) * | 2013-12-31 | 2014-09-10 | 湖南齐力达电气科技有限公司 | Grid-connected type multi-loop low temperature waste heat power generation system |
| CN105241259A (en) * | 2015-10-12 | 2016-01-13 | 中国矿业大学 | Uninterrupted calcium carbide furnace afterheat recovery control system and method |
| CN105811848A (en) * | 2016-03-21 | 2016-07-27 | 太原理工大学 | Proportional integral (PI) control method for variable gain of switched reluctance motor |
| CN107947672A (en) * | 2017-11-27 | 2018-04-20 | 中国矿业大学 | A kind of wide speed range switched reluctance motor system efficiency optimization control method |
| CN111404436A (en) * | 2020-04-30 | 2020-07-10 | 西安交通大学 | Controller and method for double-armature winding multiple electromagnetic torque single-stator single-rotor reluctance motor |
Non-Patent Citations (1)
| Title |
|---|
| 李湾: ""开关磁阻风力发电系统并网研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8698335B2 (en) | Low cost current source converters for power generation application | |
| TWI458235B (en) | Wind power generation system, and power circuit and converter structure thereof | |
| WO2011147128A1 (en) | Converting device of electrical energy | |
| WO2009115018A1 (en) | Electric energy feedback device | |
| Sivaramkrishnan et al. | SEPIC-converter based BLDC-motor-drive with power-factor-correction and minimization in torque ripple | |
| CN101527517A (en) | Twin-stage type matrix converter with direct-current excitation regulation and voltage frequency transformation | |
| Müller et al. | Medium-voltage power converter interface for Wave Dragon wave energy conversion system | |
| Porselvi et al. | PV system based induction motor with landsman converter using IFOC controller | |
| Luqman et al. | Analysis of variable speed wind energy conversion system with PMSG and Vienna rectifier | |
| Kumar et al. | SEPIC converter with 3-level NPC multi-level inverter for wind energy system (WES) | |
| US8311679B2 (en) | Matrix converters for wind energy conversion systems | |
| Rana et al. | A multilevel inverter fed induction motor driven water pumping system based on solar photovoltaic | |
| Yaramasu et al. | Fixed switching frequency predictive control of boost converter interfaced PMSG wind turbines | |
| Ramkmar et al. | Wind energy based asymmetrical half bridge flyback converter for BLDC motor | |
| Choube et al. | Evaluation of Z-Source Inverter Topologies for Power Conditioning Unit for DC Power Supply Systems | |
| Abdalla et al. | Variable speed pumped storage based on the use of H-bridge cascaded multilevel converter | |
| CN112039125A (en) | ORC system based on switched reluctance motor and control method | |
| Chimurkar et al. | A review of different power converter topologies for PMSGs wind turbine | |
| Adamowicz et al. | Cascaded doubly fed induction generator for mini and micro power plants connected to grid | |
| CN106321353A (en) | Wind driven generator variable-pitch driver, control method and wind driven generator system | |
| Bazzo et al. | Multidisciplinary design optimization of a direct-drive PMSG including the power converter cost and losses | |
| Morales et al. | Control system design and simulation of an ac/dc-dc/dc-dc/ac power converter for a permanent magnet wind power generator in rural power generation | |
| Akkaya et al. | MPPT Based Adaptive Control Algorithm for Small Scale Wind Energy Conversion Systems with PMSG | |
| Tekgun et al. | A Modular Three-Phase Buck-Boost Motor Drive Topology | |
| Sasikumar et al. | Modeling and analysis of cascaded H-bridge inverter for wind driven isolated squirrel cage induction generators |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201204 |