CN116683488B - Control strategy of three-port bidirectional DC/DC converter structure - Google Patents
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 33
- 238000011217 control strategy Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 39
- 238000013528 artificial neural network Methods 0.000 claims abstract description 32
- 238000004146 energy storage Methods 0.000 claims abstract description 23
- 230000010363 phase shift Effects 0.000 claims abstract description 22
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Classifications
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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control strategy of a three-port bidirectional DC/DC converter structure, which comprises the following steps: acquisition of Port Voltage V Bus Inductor current i dc2 And inductor current i dc1 The method comprises the steps of carrying out a first treatment on the surface of the Comparative V Bus And V Bus_ref And processing the voltage error signal to obtain an output current reference value i dc2_ref The method comprises the steps of carrying out a first treatment on the surface of the Total power P from hybrid energy storage HESS Given power P with super capacitor SC Separating low frequency part from the difference value of the power P as reference power of the storage battery bat_ref The method comprises the steps of carrying out a first treatment on the surface of the Determining a reference current i of a battery pack dc1_ref The method comprises the steps of carrying out a first treatment on the surface of the According to i dc1 、i dc2 、i dc2_ref And i dc1_ref Obtaining an output phase shift angle phi by using a bivariate PID neural network controller 13 And output phase shift angle phi 23 The method comprises the steps of carrying out a first treatment on the surface of the Will phi 23 And phi 13 And inputting the phase-shifting PWM module to generate corresponding switching signals so as to realize the control target of the three-port bidirectional DC/DC converter structure.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to a control strategy of a three-port bidirectional DC/DC converter structure.
Background
As urban rail transit rapidly progresses, it will face serious problems in terms of future energy consumption, and its energy-saving demand becomes more and more urgent. Under the large background of realizing zero carbon emission in the urban traffic field, the solar photovoltaic system is connected into an urban rail power supply system to become a development trend in recent years. Due to the influence of natural environmental factors (such as sunlight intensity and ambient temperature), the electric energy supply sustainability and stability of the photovoltaic power generation system cannot be ensured. Meanwhile, in order to avoid that regenerative braking energy of a train is directly injected into a contact net to cause overvoltage of the contact net of the urban rail power supply system, an energy storage mode is adopted to become one of main modes for solving the problem of urban rail regenerative energy utilization in the world. Therefore, the energy storage system is of great significance to the urban rail power supply system.
For urban rail transit systems, three common energy storage technologies are a storage battery, a flywheel and a super capacitor. Different hybrid energy storage has different characteristics, and the storage battery has the advantages of high energy density, low cost, flexible use and the like, but has the defects of low charge and discharge efficiency, short service life and the like; the flywheel has the advantages of high power density, quick response time, long service life and the like, but the flywheel hybrid energy storage also has the disadvantages of rotor unbalance, mechanical loss, high cost and the like; the super capacitor has the advantages of high power density, low internal resistance, long service life, safety and the like. But the super capacitor has lower energy density and relatively smaller capacity. The storage battery and the super capacitor have advantages in performance, and can complement the advantages. If the storage battery with high energy density and the super capacitor with high power density and high cycle efficiency are used in a mixed mode, the performance of the energy storage device is greatly improved, the power transmission performance of the system can be greatly enhanced, and the service life of the storage battery is effectively prolonged.
The most widely used composite energy storage system at present is characterized in that two kinds of hybrid energy storage with different voltage levels are respectively connected with a traction network through a bidirectional DC/DC converter. The structure can directly control the power of each energy storage device and realize constant voltage of the direct current bus. However, since two or more DC/DC converters are used, communication devices are indispensable, and the addition of these communication devices makes the system more complex and the reliability worse; at the same time, the cost is increased, and the application of the material is limited in occasions with requirements on volume and quality. The magnetic coupling type multi-port multi-winding isolation type converter can realize electrical insulation, different ports of the magnetic coupling type multi-port multi-winding isolation type converter are subjected to electromagnetic coupling through the isolation transformer, so that electric energy conversion among the ports is realized, and power supplies with different voltage levels can be connected with each other by selecting a reasonable turns ratio, so that the magnetic coupling type multi-port multi-winding isolation type converter has a wider application range. However, since the magnetic coupling type multi-port and multi-winding isolated converters share the transformer flux linkage, the power transmitted between different ports of the magnetic coupling type multi-port and multi-winding isolated converters have a coupling relation, which affects the response speed of the system and the design of a control loop.
Disclosure of Invention
The invention aims to provide a control strategy of a three-port bidirectional DC/DC converter structure so as to realize output voltage maintenance and power distribution and improve the dynamic performance of a system.
The technical scheme for solving the technical problems is as follows:
the invention provides a control strategy of a three-port bidirectional DC/DC converter structure, which comprises the following steps:
s1: the control output voltage control loop obtains the port voltage V of the port 3 of the three-port bidirectional DC/DC converter structure Bus ；
S2: comparing the port voltage V in the output voltage control loop Bus And reference voltage V Bus_ref Obtaining a voltage error signal;
s3: processing the voltage error signal by using a voltage controller GV in the output voltage control loop to obtain a first voltage error signalOutput current reference i of two converters dc2_ref ；
S4: control of the power distribution control loop, using a low pass filter LPF, from the total power P of the hybrid energy store HESS Given power P with super capacitor SC Separating low frequency part from the difference value of the power P as reference power of the storage battery bat_ref ；
S5: obtaining a reference current i of the storage battery pack according to the reference power of the storage battery pack and the voltage of the storage battery pack dc1_ref ；
S6: obtaining output inductance L dc2 Is of the inductance current i of (2) dc2 And output inductance L dc1 Is of the inductance current i of (2) dc1 According to the inductance current i dc1 Inductor current i dc2 Output current reference value i of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Obtaining an output phase shift angle phi between the driving signals of the switching tubes of the port 1 and the port 3 by using a bivariate PID neural network controller 13 And output phase shift angle phi between port 2 and port 3 switching tube drive signals 23 ；
S7: the output phase shift angle phi 23 And the output phase shift angle phi 13 And generating corresponding switching signals through a phase-shifting PWM modulation module so as to realize the control targets of stable output voltage of the three-port bidirectional DC/DC converter structure and the hybrid energy storage power distribution.
Optionally, in the S1, the three-port bidirectional DC/DC converter structure includes:
the three-winding DC/DC converter comprises an intermediate three-winding transformer, a first converter, a second converter and a third converter, wherein the first converter, the second converter and the third converter are positioned on two sides of the intermediate three-winding transformer, the input sides of the first converter and the second converter are respectively connected with the low-voltage side of the intermediate three-winding transformer, the high-voltage side of the intermediate three-winding transformer is connected with the output side of the third converter, the input side of the third converter is used as a port 3 of the three-port bidirectional DC/DC converter structure to be connected with a traction network, the output side of the first converter is used as a port 1 of the three-port bidirectional DC/DC converter structure, the output side of the second converter is used as a port 2 of the three-port bidirectional DC/DC converter structure, and the port 1 and the port 2 are simultaneously connected with hybrid energy storage.
Optionally, the first converter comprises an input inductance L r1 Capacitance C 1 Capacitance C 2 Output inductance L dc1 Switch tube S 1 And a switch tube S 2 The input inductance L r1 One end of the intermediate three-winding transformer is connected with one end of the low-voltage side of the intermediate three-winding transformer, and the other end of the intermediate three-winding transformer is simultaneously connected with the switching tube S 1 And the source of said capacitor C 2 Is one end of the switch tube S 1 Is connected with the capacitor C 1 Is one end of the capacitor C 2 The other end of the switch tube S is connected with the switch tube S at the same time 2 And the output inductance L dc1 Is one end of the output inductance L dc1 Is used as the positive electrode of the port 1, and the other end of the low-voltage side of the middle three-winding transformer is used as the capacitor C 1 Is connected with the other end of the switch tube S 2 Is connected simultaneously as the negative electrode of the port 1.
Optionally, the second converter comprises an input inductance L r2 Capacitance C 3 Capacitance C 4 Output inductance L dc2 Switch tube S 3 And a switch tube S 4 The input inductance L r2 One end of the intermediate three-winding transformer is connected with one end of the low-voltage side of the intermediate three-winding transformer, and the other end of the intermediate three-winding transformer is simultaneously connected with the switching tube S 3 And the source of said capacitor C 4 Is one end of the switch tube S 3 Is connected with the capacitor C 3 Is one end of the capacitor C 4 The other end of the switch tube S is connected with the switch tube S at the same time 4 And the output inductance L dc2 Is one end of the output inductance L dc2 Is used as the positive electrode of the port 2, and the other end of the low-voltage side of the middle three-winding transformer is used as the capacitor C 3 Is connected with the other end of the switch tube S 4 Is connected simultaneously as the negative electrode of the port 2.
Optionally, the third converter comprises an input capacitance C s Switch tube S 5 Switch tube S 6 Switch tube S 7 Switch tube S 8 And output inductance L r3 The input capacitance C S One end of the switch tube S 5 Is connected with the drain electrode of the switch tube S 7 Is connected at the same time as the positive electrode connected with the port 3, the input capacitor C S Is arranged at the other end of the switch tube S 8 Is connected with the source electrode of the switch tube S 6 Is connected at the same time as the negative electrode of the port 3, the switch tube S 5 Source electrode of the switch tube S 6 And the output inductance L r3 Is connected at the same time with one end of the output inductance L r3 The other end of the intermediate three-winding transformer is connected with one end of the high voltage side of the intermediate three-winding transformer, and the switching tube S 7 Is connected with the source electrode of the switch tube S 8 And the drain electrode of the intermediate three-winding transformer is simultaneously connected with the other end of the high-voltage side of the intermediate three-winding transformer.
Optionally, all switching tubes of the first converter and/or the second converter and/or the third converter are fully controlled semiconductor devices.
Optionally, in S4, the hybrid energy storage includes a supercapacitor and a battery, the power distribution control loop controls charging and discharging of the battery, and the output voltage control loop controls charging and discharging of the supercapacitor.
Optionally, the S6 includes:
-applying said inductor current i dc1 And the inductor current i dc2 Respectively used as the actual input value y of each single-variable PID neural network in the two-variable PID neural network controller 1 And y 2 ；
Reference value i of output current of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Respectively used as controlled variable given value r of each single variable PID neural network 1 And r 2 ；
According to the actual input value y 1 And y 2 And the controlled variable given value r 1 And r 2 Obtaining a control quantity v 1 And v 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein,the control quantity v 1 And v 2 Representing the output phase shift angle phi between the port 1 and port 3 switching tube drive signals, respectively 13 And output phase shift angle phi between port 2 and port 3 switching tube drive signals 23 。
Optionally, each univariate PID neural network in the bivariate PID neural network controller includes:
the input layer, the hidden layer and the output layer are sequentially arranged, and the input layer independently inputs the same number of controlled variable given values r 1 、r 2 And the actual input value y 1 、y 2 And the control quantity v output by the two-variable PID neural network controller 1 、v 2 Received by the phase-shifting PWM module, the phase-shifting PWM module outputs a plurality of PWM signals to the controlled object three-port bidirectional DC/DC converter, and the controlled object three-port bidirectional DC/DC converter outputs the actual input value y 1 、y 2 And feeding back the feedback to the input end of the two-variable PID neural network controller to realize closed-loop control of the whole network.
The invention has the following beneficial effects:
the control strategy of the three-port bidirectional DC/DC converter provided by the invention is suitable for the three-port bidirectional DC/DC converter of the hybrid energy storage system in urban rail transit, can overcome the problems of difficult design, reduced control precision and the like caused by the separation of a decoupler and a controller in the traditional decoupling control, has the functions of decoupling port transmission power and controlling port voltage, realizes stable output voltage and power distribution, and improves the dynamic performance of the system.
Drawings
FIG. 1 is a flow chart of a control strategy of a three-port bi-directional DC/DC converter architecture of the present invention;
FIG. 2 is a schematic block diagram of a control strategy of the three-port bi-directional DC/DC converter architecture of the present invention;
FIG. 3 is a schematic diagram of the result of the three-port bi-directional DC/DC converter structure of the present invention;
FIG. 4 is a schematic diagram of a two-variable PID neural network according to the present invention.
Description of the reference numerals
1-a first converter; a 2-second converter; 3-third converter.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The present invention provides a control strategy of a three-port bi-directional DC/DC converter structure, as shown with reference to fig. 1 and 2, comprising:
s1: the control output voltage control loop obtains the port voltage V of the port 3 of the three-port bidirectional DC/DC converter structure Bus ；
Here, referring to fig. 3, the three-port bidirectional DC/DC converter structure according to the present invention includes: an intermediate three-winding transformer, and a first converter 1, a second converter 2 and a third converter 3 which are positioned at two sides of the intermediate three-winding transformer, wherein the input sides of the first converter 1 and the second converter 2 are respectively connected with the low-voltage side of the intermediate three-winding transformer, the high-voltage side of the intermediate three-winding transformer is connected with the output side of the third converter 3, the input side of the third converter 3 is used as a port 3 of the three-port bidirectional DC/DC converter structure and is connected with a traction network, the output side of the first converter 1 is used as a port 1 of the three-port bidirectional DC/DC converter structure, the output side of the second converter 2 is used as a port 2 of the three-port bidirectional DC/DC converter structure, and the port 1 and the port 2 are simultaneously connected with hybrid energy storage.
The first converter 1 comprises an input inductance L r1 Capacitance C 1 Capacitance C 2 Output inductance L dc1 Switch tube S 1 And a switch tube S 2 The input inductance L r1 One end of the intermediate three-winding transformer is connected with one end of the low-voltage side of the intermediate three-winding transformer, and the other end of the intermediate three-winding transformer is simultaneously connected with the switching tube S 1 And the source of said capacitor C 2 Is one end of the switch tube S 1 Is connected with the capacitor C 1 Is one end of the capacitor C 2 The other end of the switch tube S is connected with the switch tube S at the same time 2 And the output inductance L dc1 Is one end of the output inductance L dc1 Is used as the positive electrode of the port 1, and the other end of the low-voltage side of the middle three-winding transformer is used as the capacitor C 1 Is connected with the other end of the switch tube S 2 Is connected simultaneously as the negative electrode of the port 1.
The second converter 2 comprises an input inductance L r2 Capacitance C 3 Capacitance C 4 Output inductance L dc2 Switch tube S 3 And a switch tube S 4 The input inductance L r2 One end of the intermediate three-winding transformer is connected with one end of the low-voltage side of the intermediate three-winding transformer, and the other end of the intermediate three-winding transformer is simultaneously connected with the switching tube S 3 And the source of said capacitor C 4 Is one end of the switch tube S 3 Is connected with the capacitor C 3 Is one end of the capacitor C 4 The other end of the switch tube S is connected with the switch tube S at the same time 4 And the output inductance L dc2 Is one end of the output inductance L dc2 Is used as the positive electrode of the port 2, and the other end of the low-voltage side of the middle three-winding transformer is used as the capacitor C 3 Is connected with the other end of the switch tube S 4 Is connected simultaneously as the negative electrode of the port 2.
The third converter 3 comprises an input capacitance C s Switch tube S 5 Switch tube S 6 Switch tube S 7 Switch tube S 8 And output inductance L r3 The input capacitance C S One end of the switch tube S 5 Is connected with the drain electrode of the switch tube S 7 Is connected at the same time as the positive electrode connected with the port 3, the input capacitor C S Is arranged at the other end of the switch tube S 8 Is connected with the source electrode of the switch tube S 6 Is connected at the same time as the negative electrode of the port 3, the switch tube S 5 Source electrode of the switch tube S 6 And the output inductance L r3 Is connected at the same time with one end of the output inductance L r3 Is connected to the high-voltage side end of the intermediate three-winding transformer, the switchTube S 7 Is connected with the source electrode of the switch tube S 8 And the drain electrode of the intermediate three-winding transformer is simultaneously connected with the other end of the high-voltage side of the intermediate three-winding transformer.
Alternatively, all switching tubes of the first converter 1 and/or the second converter 2 and/or the third converter 3 are fully controlled semiconductor devices.
In addition, in the present invention, the three-winding transformer is a high-frequency transformer, wherein the transformation ratio between the three ports is determined by the traction network voltage and the nominal voltage of the hybrid energy storage connected with the first converter 1 and the second converter 2, and the capacity is determined by the specific hybrid energy storage capacity.
S2: comparing the port voltage V in the output voltage control loop Bus And reference voltage V Bus_ref Obtaining a voltage error signal;
s3: processing the voltage error signal by using a voltage controller GV in the output voltage control loop to obtain an output current reference value i of the second converter dc2_ref ；
S4: control of the power distribution control loop, using a low pass filter LPF, from the total power P of the hybrid energy store HESS Given power P with super capacitor SC Separating low frequency part from the difference value of the power P as reference power of the storage battery bat_ref ；
The hybrid energy storage comprises a super capacitor and a storage battery, the power distribution control loop is powered by the storage battery, and the output voltage control loop is powered by the super capacitor.
S5: obtaining a reference current i of the storage battery pack according to the reference power of the storage battery pack and the voltage of the storage battery pack dc1_ref ；
Wherein the power distribution control loop captures the voltage of the battery pack, so that the voltage of the battery pack is equal to the rated voltage V of the output side of the first converter Bat Equal, and therefore, the reference current i of the battery pack dc1_ref By reference power of the battery and voltage V of the battery Bat And obtaining by using a division calculation mode.
S6: obtaining the obtainedOutput inductor L dc2 Is of the inductance current i of (2) dc2 And output inductance L dc1 Is of the inductance current i of (2) dc1 According to the inductance current i dc1 Inductor current i dc2 Output current reference value i of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Obtaining an output phase shift angle phi between the driving signals of the switching tubes of the port 1 and the port 3 by using a bivariate PID neural network controller 13 And output phase shift angle phi between port 2 and port 3 switching tube drive signals 23 ；
Optionally, S6 includes:
-applying said inductor current i dc1 And the inductor current i dc2 Respectively used as the actual input value y of each single-variable PID neural network in the bivariate PID neural network (MPIDNN) controller 1 And y 2 ；
Reference value i of output current of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Respectively used as controlled variable given value r of each single variable PID neural network 1 And r 2 ；
According to the actual input value y 1 And y 2 And the controlled variable given value r 1 And r 2 Obtaining a control quantity v 1 And v 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the control amount v 1 And v 2 Representing the output phase shift angle phi between the port 1 and port 3 switching tube drive signals, respectively 13 And output phase shift angle phi between port 2 and port 3 switching tube drive signals 23 。
Specifically, the inductor current i dc1 Inductor current i dc2 Output current reference value i of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Each neuron which is respectively used as an input layer of a bivariate PID neural network (MPIDNN) controller is mapped onto neurons corresponding to proportional elements, integral elements and differential elements of an hidden layer, the hidden layer is connected with an output layer in a staggered way to form a neural network, and a control quantity phase shift angle phi of the output layer is obtained 13 And phase shift angle phi 23 Finally, the phase-shifting PWM module generates a control signal according to the phase-shifting angle to control the three-port bidirectional DC/DC converter, and the two-variable PID neural network (MPIDNN) controller performs online autonomous learning according to the control effect fed back, and achieves the functions of port transmission power decoupling and port voltage control by adjusting the network connection weight value in real time.
In addition, as described with reference to fig. 2 and 4, each univariate PID neural network in the bivariate PID neural network controller includes:
the input layer, the hidden layer and the output layer are sequentially arranged, and the input layer independently inputs the same number of controlled variable given values r 1 、r 2 And the actual input value y 1 、y 2 And the control quantity v output by the two-variable PID neural network controller 1 、v 2 Received by the phase-shifting PWM module, the phase-shifting PWM module outputs a plurality of PWM signals to the controlled object three-port bidirectional DC/DC converter, and the controlled object three-port bidirectional DC/DC converter outputs the actual input value y 1 、y 2 And feeding back the feedback to the input end of the two-variable PID neural network controller to realize closed-loop control of the whole network.
The bivariate PID neural network (MPIDNN) is a network structure formed by connecting a plurality of identical single-input neural networks in parallel in a crossing way. The input layer to the hidden layer of each sub-network are independent of each other, while the hidden layer to the output layer are substantially interleaved. The input layer of MPIDNN independently inputs a plurality of target values and controlled quantities with the same quantity. The output of MPIDNN is received by the controlled object, and the output of the controlled system is fed back to the neural network, so that the whole system forms a closed loop, thereby completing the control task.
S7: the output phase shift angle phi 23 And the output phase shift angle phi 13 And generating corresponding switching signals through a phase-shifting PWM modulation module so as to realize the control targets of stable output voltage of the three-port bidirectional DC/DC converter structure and the hybrid energy storage power distribution.
Wherein, referring to FIG. 2, the corresponding switching signals comprise the control signals PWM-S1-PWM-S of the switching tubes 1-8The control effect of the three-port bi-directional DC/DC converter comprises the port voltage V of port 3 Bus Output inductance L dc2 Is of the inductance current i of (2) dc2 Rated voltage V of output side of first converter Bat Controlling a power distribution control loop to obtain an output inductance L dc1 Is of the inductance current i of (2) dc1 。
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A control strategy for a triac for a DC/DC converter architecture, said control strategy comprising:
s1: the control output voltage control loop obtains the port voltage V of the third port of the three-port bidirectional DC/DC converter structure Bus ；
S2: comparing the port voltage V in the output voltage control loop Bus And reference voltage V Bus_ref Obtaining a voltage error signal;
s3: processing the voltage error signal by using a voltage controller GV in the output voltage control loop to obtain an output current reference value i of the second converter dc2_ref ；
S4: control of the power distribution control loop, using a low pass filter LPF, from the total power P of the hybrid energy store HESS Given power P with super capacitor SC Separating low frequency part from the difference value of the power P as reference power of the storage battery bat_ref ；
S5: obtaining a reference current i of the storage battery pack according to the reference power of the storage battery pack and the voltage of the storage battery pack dc1_ref ；
S6: obtaining output inductance L dc2 Is of the inductance current i of (2) dc2 And output inductance L dc1 Is of the inductance current i of (2) dc1 According to the inductance current i dc1 Inductor current i dc2 Output current reference value i of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Obtaining an output phase shift angle phi between the driving signals of the switching tubes of the first port and the third port by using a bivariate PID neural network controller 13 And an output phase shift angle phi between the second port and third port switching tube drive signals 23 ；
S7: the output phase shift angle phi 23 And the output phase shift angle phi 13 And generating corresponding switching signals through a phase-shifting PWM modulation module so as to realize the control targets of stable output voltage of the three-port bidirectional DC/DC converter structure and the hybrid energy storage power distribution.
2. The control strategy of a triac as claimed in claim 1, wherein in S1, said triac comprises:
the three-port bidirectional DC/DC converter comprises an intermediate three-winding transformer, a first converter, a second converter and a third converter, wherein the first converter, the second converter and the third converter are positioned on two sides of the intermediate three-winding transformer, the input sides of the first converter and the second converter are respectively connected with the low-voltage side of the intermediate three-winding transformer, the high-voltage side of the intermediate three-winding transformer is connected with the output side of the third converter, the input side of the third converter is used as a third port of the three-port bidirectional DC/DC converter structure and is connected with a traction network, the output side of the first converter is used as a first port of the three-port bidirectional DC/DC converter structure, and the output side of the second converter is used as a second port of the three-port bidirectional DC/DC converter structure, and the first port and the second port are simultaneously connected with hybrid energy storage.
3. The control strategy of a three-port bi-directional DC/DC converter structure according to claim 2, characterized in that the first converter comprises an input inductance L r1 Capacitance C 1 Capacitance C 2 Output inductance L dc1 Switch tube S 1 And a switch tube S 2 The input inductance L r1 Is connected to one end of the low-voltage side of the intermediate three-winding transformerThe other end is simultaneously connected with the switch tube S 1 And the source of said capacitor C 2 Is one end of the switch tube S 1 Is connected with the capacitor C 1 Is one end of the capacitor C 2 The other end of the switch tube S is connected with the switch tube S at the same time 2 And the output inductance L dc1 Is one end of the output inductance L dc1 The other end of the intermediate three-winding transformer is used as the positive electrode of the first port, and the other end of the low-voltage side of the intermediate three-winding transformer is used as the capacitor C 1 Is connected with the other end of the switch tube S 2 Is connected simultaneously as the negative electrode of the first port.
4. A control strategy for a three-port bi-directional DC/DC converter structure according to claim 3, characterized in that said second converter comprises an input inductance L r2 Capacitance C 3 Capacitance C 4 Output inductance L dc2 Switch tube S 3 And a switch tube S 4 The input inductance L r2 One end of the intermediate three-winding transformer is connected with one end of the low-voltage side of the intermediate three-winding transformer, and the other end of the intermediate three-winding transformer is simultaneously connected with the switching tube S 3 And the source of said capacitor C 4 Is one end of the switch tube S 3 Is connected with the capacitor C 3 Is one end of the capacitor C 4 The other end of the switch tube S is connected with the switch tube S at the same time 4 And the output inductance L dc2 Is one end of the output inductance L dc2 The other end of the second port is used as the positive electrode of the second port, and the other end of the low-voltage side of the middle three-winding transformer is used as the capacitor C 3 Is connected with the other end of the switch tube S 4 Is connected simultaneously as the negative electrode of the second port.
5. The control strategy of a three-port bi-directional DC/DC converter structure according to claim 4, characterized in that said third converter comprises an input capacitor C s Switch tube S 5 Switch tube S 6 Switch tube S 7 Switch tube S 8 And output inductance L r3 The input capacitance C S Is connected with the switchTube S 5 Is connected with the drain electrode of the switch tube S 7 Is connected at the same time as the positive electrode connected with the third port, the input capacitor C S Is arranged at the other end of the switch tube S 8 Is connected with the source electrode of the switch tube S 6 The source of the third port is connected at the same time to serve as the cathode of the third port, the switch tube S 5 Source electrode of the switch tube S 6 And the output inductance L r3 Is connected at the same time with one end of the output inductance L r3 The other end of the intermediate three-winding transformer is connected with one end of the high voltage side of the intermediate three-winding transformer, and the switching tube S 7 Is connected with the source electrode of the switch tube S 8 And the drain electrode of the intermediate three-winding transformer is simultaneously connected with the other end of the high-voltage side of the intermediate three-winding transformer.
6. The control strategy of a three-port bi-directional DC/DC converter structure according to claim 5, characterized in that all switching tubes of the first converter and/or the second converter and/or the third converter are fully controlled semiconductor devices.
7. The control strategy of a three-port bi-directional DC/DC converter structure according to claim 1, wherein in S4, the hybrid energy storage includes a supercapacitor and a battery, the power distribution control loop controls the battery to charge and discharge, and the output voltage control loop controls the supercapacitor to charge and discharge.
8. The control strategy of a three-port bi-directional DC/DC converter architecture according to claim 1, characterized in that said S6 comprises:
-applying said inductor current i dc1 And the inductor current i dc2 Respectively used as the actual input value y of each single-variable PID neural network in the two-variable PID neural network controller 1 And y 2 ；
Reference value i of output current of the second converter dc2_ref And a reference current i of the battery pack dc1_ref Respectively used as controlled variable given value r of each single variable PID neural network 1 And r 2 ；
According to the actual input value y 1 And y 2 And the controlled variable given value r 1 And r 2 Obtaining a control quantity v 1 And v 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the control amount v 1 And v 2 Representing the output phase shift angle phi between the first port and the third port switching tube drive signals, respectively 13 And an output phase shift angle phi between the second port and third port switching tube drive signals 23 。
9. The control strategy of a three-port bi-directional DC/DC converter architecture according to claim 1 or 8, wherein each univariate PID neural network in the two-variable PID neural network controller comprises:
the input layer, the hidden layer and the output layer are sequentially arranged, and the input layer independently inputs the same number of controlled variable given values r 1 、r 2 And the actual input value y 1 、y 2 And the control quantity v output by the two-variable PID neural network controller 1 、v 2 Received by the phase-shifting PWM modulation module, which outputs a plurality of PWM signals to the triac, which outputs the actual input value y 1 、y 2 And feeding back the feedback to the input end of the two-variable PID neural network controller to realize closed-loop control of the whole network.
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