CN117595521A - Multi-CPS ground cabinet synchronous control method, system, medium and equipment - Google Patents
Multi-CPS ground cabinet synchronous control method, system, medium and equipment Download PDFInfo
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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Abstract
The invention relates to the technical field of non-contact power supply, and discloses a multi-CPS ground cabinet synchronous control method, a system, a medium and equipment, wherein the method comprises the following steps: the CPS ground cabinets are connected with the control bus and send a busy request message to the control bus, and the control bus selects a master device and a slave device from the control bus; the master device receives a synchronous control instruction through a control bus and generates a synchronous signal message comprising PWM frequency, duty cycle and start-stop information of CPS ground cabinet work, the master device periodically broadcasts the synchronous signal message through the control bus, and the slave device acquires the synchronous signal message through the control bus; the master-slave equipment realizes stable resonant frequency through the bilateral LCC resonant network, and synchronous control of a plurality of CPS ground cabinets is realized according to the synchronous signal message under the stable resonant frequency. The invention can effectively reduce the operation and maintenance cost of the whole equipment and realize the effective control of the working state of each CPS ground cabinet while synchronizing.
Description
Technical Field
The invention relates to the technical field of non-contact power supply, in particular to a synchronous control method, a synchronous control system, a synchronous control medium and synchronous control equipment for a multi-CPS ground cabinet.
Background
Non-contact power supply (Contactless Power Supply, CPS) is a power supply method that combines modern power electronic energy conversion technology, magnetic field coupling technology, and modern control theory, microelectronic control technology to achieve the transfer of energy from stationary devices to stationary or mobile devices. With the development of wireless charging technology, in order to realize high-power electric energy transmission, the field of CPS is gradually changed from a static charging scenario to a dynamic power supply scenario. CPS ground cabinet is a ground cabinet that uses CPS technique, and the function of realization is: the three-phase power frequency alternating current power supply is rectified and boosted, then voltage is modulated into direct current required by the system, then the direct current is inverted into high-frequency alternating current, and the high-frequency current enters the track litz wire to excite a high-frequency magnetic field after being subjected to resonance compensation of a series of inductors and capacitors.
In an actual transmission system, the current phase and frequency of the dynamic wireless power supply output end are always required to be consistent, and when a plurality of CPS ground cabinets work simultaneously, the CPS ground cabinets work simultaneously in a mode shown in fig. 1, so that a power supply area can be prolonged. When a plurality of CPS ground cabinets are cooperatively output, the frequency and the phase of the output inversion signals need to be synchronized, and whether the inversion signals are synchronous or not and the effect of synchronization directly influence the energy transmission efficiency of the transmission system. Therefore, how to implement multi-CPS floor cabinet synchronization control is one of the key technologies for CPS product stability and usability.
In order to realize synchronous control of the multi-CPS ground cabinet, in the prior art, an optical fiber synchronous mode is adopted to carry out system synchronous control, and although the transmission speed of optical fibers is high and the synchronous precision is high, special optical fiber communication circuits and optical fiber conversion modules are required to be additionally configured by using the optical fibers, so that the operation and maintenance cost of equipment is high. And a control mode based on bus synchronization is also used, so that the status of each inversion unit is equal by not distinguishing a master machine from a slave machine, and a synchronization signal is also generated when any CPS ground cabinet in the system fails, so that the reliability of the carrier synchronization signal is greatly improved. However, when the bus control is used, the synchronous signal is realized only based on a synchronous pulse counting mode, and the working frequency and the duty ratio of the system are required to be adaptively changed due to the change of the load when the wireless power supply system is used, so that the synchronous frequency conversion and the synchronous duty ratio control of the multi-CPS ground cabinet are difficult to realize by the existing synchronous system.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects in the prior art, and provide a multi-CPS ground cabinet synchronous control method, a system, a medium and equipment, which can effectively reduce the operation and maintenance cost of the whole equipment and realize the effective control of the working states of each CPS ground cabinet while synchronizing.
In order to solve the technical problems, the invention provides a synchronous control method of a multi-CPS ground cabinet, which comprises the following steps:
the CPS ground cabinets are connected with a control bus and send a busy request message to the control bus, the control bus selects CPS ground cabinets with successful busy as main equipment, and other CPS ground cabinets are used as auxiliary equipment;
the master device receives a synchronous control instruction through the control bus and generates a synchronous signal message, wherein the synchronous signal message comprises PWM frequency, duty cycle and start-stop information of CPS ground cabinet work;
the master device periodically broadcasts the synchronous signal message through the control bus, and each slave device acquires the synchronous signal message through the control bus;
and the master equipment and each slave equipment realize stable resonant frequency through a bilateral LCC resonant network, and synchronous control of a plurality of CPS ground cabinets is realized according to the synchronous signal message under the stable resonant frequency.
In one embodiment of the present invention, the master device periodically broadcasts the synchronization signal packet through the control bus, and each slave device acquires the synchronization signal packet through the control bus, which specifically includes:
the master device sets a master synchronization point and a synchronization time period, and combines the master synchronization point to broadcast the synchronization signal message periodically through the control bus according to the synchronization time period;
setting a preset time for judging whether the master device or each slave device is normal, and if the slave device does not successfully acquire the synchronous signal message on the control bus within the preset time, the control bus reselects the CPS ground cabinet with successful line occupation as the master device; and if each slave device successfully acquires the synchronous signal message from the control bus within the preset time, each slave device analyzes PWM frequency, duty ratio and start-stop information from the acquired synchronous signal message.
In one embodiment of the present invention, the slave device analyzes the PWM frequency, duty cycle, and start-stop information from the obtained synchronization signal message, checks the obtained synchronization signal message, analyzes the synchronization signal message if the check is successful, and re-obtains the synchronization signal message on the control bus if the check is failed.
In one embodiment of the present invention, the master device and each slave device implement a stable resonance frequency through a bilateral LCC resonance network, specifically:
taking a bilateral LCC resonant network as output ends of the master equipment and each slave equipment, wherein the bilateral LCC resonant network comprises a high-frequency full-bridge inverter circuit, a primary LCC compensation network, a transformer and a secondary LCC compensation network; the primary side LCC compensation network comprises a switching tube of an inverter and comprises a compensation inductance L f1 And two compensation capacitors C 1 、C f1 The transformer comprises a coupling coil L 1 、L 2 The secondary side LCC compensation network comprises a compensation inductance L f2 And two compensation capacitors C 2 、C f2 ；
Setting the L f1 、C 1 、C f1 、L 1 、L 2 、L f2 、C 2 And C f2 The values of (2) satisfy:
where f represents the resonant frequency.
In one embodiment of the present invention, each slave device uses a time of acquiring the synchronization signal packet as a slave synchronization point, and each slave device sets a position of the slave synchronization point according to the slave synchronization point and a data transmission delay between the slave device and the master device.
In one embodiment of the present invention, the synchronization control of the CPS ground cabinets is implemented according to the synchronization signal message at the stable resonance frequency, specifically:
each CPS ground cabinet collects the resonance frequency of the CPS ground cabinet and sends the CPS ground cabinet to an upper computer through the control bus, the upper computer calculates PWM frequency, duty cycle and start-stop information required by the current load by combining the resonance frequency, and sends corresponding synchronous control instructions to the master equipment, and the master equipment sends the synchronous control instructions to each slave equipment through the control bus;
the master equipment synchronously turns over according to the PWM frequency in the synchronous control instruction, and controls the on-off of a switching tube of an inverter in the master equipment according to the PWM frequency, the duty ratio and the start-stop information in the synchronous control instruction;
and each slave device synchronously turns according to the PWM frequency analyzed in the synchronous signal message, and controls the on-off of a switching tube of an inverter in each slave device according to the PWM frequency analyzed in the synchronous signal message, the duty cycle and the start-stop information.
The invention also provides a multi-CPS ground cabinet synchronous control system, which comprises:
the control bus is used to control the control bus,
a plurality of CPS ground cabinets, each CPS ground cabinet being connected with the control bus;
the master equipment judging module is used for enabling the CPS ground cabinets to send a line occupying request message to the control bus, wherein the control bus selects CPS ground cabinets with successful line occupying as master equipment and other CPS ground cabinets as slave equipment;
the synchronous information generation module is used for enabling the main equipment to receive a synchronous control instruction through the control bus and generate a synchronous signal message, wherein the synchronous signal message comprises PWM frequency, duty ratio and start-stop information of CPS ground cabinet work;
the synchronous information receiving and transmitting module is used for enabling the master equipment to periodically broadcast the synchronous signal message through the control bus, and each slave equipment obtains the synchronous signal message through the control bus;
and the synchronous control module is used for enabling the master equipment and each slave equipment to realize stable resonant frequency through a bilateral LCC resonant network, and realizing synchronous control of a plurality of CPS ground cabinets according to the synchronous signal message under the stable resonant frequency.
In one embodiment of the present invention, the control bus comprises a power bus, a synchronization bus, a communication bus, and the CPS floor cabinet comprises an inverter;
the inverter comprises a low-power alternating-current transformer, a high-power alternating-current transformer and a power boosting circuit; the output end of the CPS ground cabinet is connected in parallel with the input end of the power lifting circuit through the low-power alternating-current transformer, and the output end of the power lifting circuit is connected into the power bus through the high-power alternating-current transformer to realize wireless energy transmission;
the control end of the inverter of the CPS ground cabinet is connected to the synchronous bus, and the on-off of a switching tube of the inverter of the CPS ground cabinet is controlled through the synchronous bus to realize synchronous control;
the control end of the inverter of the CPS ground cabinet is also connected to the communication bus and communicates with the outside through the communication bus.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the multi-CPS floor cabinet synchronization control method.
The invention also provides a multi-CPS ground cabinet synchronous control device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the multi-CPS ground cabinet synchronous control method when executing the computer program.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the CPS ground cabinets are connected through the control bus, the selection of the master equipment and the slave equipment is judged by the control bus, the probability that each CPS ground cabinet becomes the master equipment is the same, the synchronous control signals and the working state information are transmitted through the control bus, and an additional optical fiber circuit or a conversion module is not needed in the synchronous control process; and the newly added CPS ground cabinet can be expanded only by connecting a control bus, so that the running and maintenance cost of the whole equipment can be effectively reduced. Synchronous control is carried out by sending a synchronous message containing PWM frequency, duty cycle and start-stop information through a control bus, and the control of the PWM frequency, the duty cycle and the start-stop of each CPS ground cabinet is realized while the synchronous control is carried out; and the periodic message receiving and transmitting mode can adaptively and synchronously adjust the working states of all CPS control cabinets according to load change, can meet the control requirements of synchronous track current phase and synchronous power control of a plurality of CPS ground cabinets in a wireless energy transmission system, and realizes more effective synchronous control.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
fig. 1 is a schematic circuit diagram of a transmitting end of a multi-CPS ground cabinet in the prior art.
Fig. 2 is a flow chart of the method of the present invention.
Fig. 3 is a schematic topology of a dual-sided LCC network in the present invention.
Description of the specification reference numerals: 1. a high-frequency full-bridge inverter circuit; 2. primary side LCC compensation network; 3. a transformer; 4. secondary side LCC compensation network.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 2, the invention discloses a multi-CPS ground cabinet synchronous control method, which comprises the following steps:
s1: the CPS ground cabinets are connected with a control bus and send a busy request message to the control bus, the control bus selects CPS ground cabinets with successful busy as main equipment, and other CPS ground cabinets are used as auxiliary equipment; in this embodiment, after the CPS ground cabinets are powered on, a busy request message is sent to the control bus within 10ms, and the control bus selects the CPS ground cabinet with successful busy first as the master device.
If no equipment with a busy line exists on the synchronous bus of the control bus, the CPS ground cabinet corresponding to the busy line request message is successfully received as a main equipment; if the equipment with the busy line exists on the synchronous bus, other CPS ground cabinets corresponding to the busy line request received later are used as slave equipment, and the function of actively sending the busy line request message of the CPS ground cabinets is closed, so that the CPS ground cabinets can only receive the data message from the control bus. If the CPS ground cabinet main equipment has a shutdown condition, under the control of the step S4, the CPS ground cabinet auxiliary equipment cannot successfully acquire the synchronous signal message within a preset time, the function of sending the message is restarted, and the step S1 is returned to re-judge the identity. Through the design, each CPS ground cabinet has the opportunity to compete into the main equipment, any CPS ground cabinet is added or pushed out, the synchronous control of the system is not influenced, and the adaptability of the system is improved.
S2: the upper computer sends a synchronous control instruction to the main equipment, the main equipment receives the synchronous control instruction sent by the upper computer through the control bus and determines the PWM frequency, the duty cycle and the start-stop information of the work of the CPS ground cabinet corresponding to the current load according to the synchronous control instruction, and accordingly a synchronous signal message comprising the PWM frequency, the duty cycle and the start-stop information of the work of the CPS ground cabinet slave equipment is generated. The upper computer determines PWM frequency, duty ratio and start-stop information of each CPS ground cabinet according to the current load demand, and sends the PWM frequency, duty ratio and start-stop information to each slave device through the master device, so that the load demand of the whole system is realized.
S3: the master periodically broadcasts a synchronization signal message over the control bus.
The master device sets a master synchronization point and a synchronization time period, and combines the master synchronization point to periodically broadcast a synchronization signal message through the control bus according to the synchronization time period. The master device may determine the master synchronization point and the synchronization signal message transmission period according to the PWM frequency. In this embodiment, the synchronization bus in the control bus adopts a high-frequency signal bus, and the sending frequency of the synchronization signal message is far higher than the PWM frequency, and is generally set to a frequency-doubling relationship, so that the master synchronization point can be the starting point of PWM.
After CPS ground cabinet sends the busy request message to control bus, CPS ground cabinet which is busy at first time becomes main equipment. The master synchronization point in the present invention refers to a time point when the CPS floor cabinet serving as a master device successfully applies for a busy line, i.e., successfully applies for a synchronization control signal.
S4: the slave device acquires the synchronous signal message through the control bus.
The preset time for judging whether the master device or the slave device is normal is set, and the preset time in the embodiment is check time for judging whether the master device and the slave device are locked or not on line, if the slave CPS ground cabinet exceeds the check time and does not act, the master CPS ground cabinet or the slave CPS ground cabinet is locked by the master controller and can not be started or disconnected. If the slave device does not successfully acquire the synchronous signal message on the control bus within the preset time, executing S1, and reselecting the CPS ground cabinet with successful line occupation as the master device by the control bus; if the slave device successfully acquires the synchronization signal message on the control bus within the preset time, S5 is executed.
In this embodiment, the slave device uses the time of acquiring the first bit of the synchronization signal message as the slave synchronization point, and the slave device sets the position of the slave synchronization point according to the slave synchronization point and the data transmission delay between the slave device and the master device. The data transfer delay between the slave device and the master device is preset according to the mounting position of each inverter and the empirical value of the wiring length, so that the synchronization accuracy is further improved. Corresponding to the master synchronization point of the master device, the slave synchronization point in the present invention refers to a time point when the CPS ground cabinet serving as the slave device successfully acquires the synchronized signal and takes a line, and the position of the slave synchronization point=the time point of the slave synchronization point+the time delay of the CPS ground cabinet serving as the slave device to the master device.
S5: and (3) checking the acquired synchronous signal message, wherein in the embodiment, the checking can be performed by CRC checking and other methods, if the checking is successful, S6 is executed to analyze the synchronous signal message, and if the checking is failed, S4 is executed to acquire the synchronous signal message again on the control bus.
The synchronization signal message in this embodiment further includes start information and check information, where the start information is used to mark the synchronization signal message, and the check information is used to check the synchronization signal message. The synchronization signal message in this embodiment includes at least 35 bits, including start information of 2 bits, PWM frequency information of 12 bits, PWM duty cycle information of 12 bits, start-stop information of 1bit, and CRC check information of 8 bits. After receiving the synchronous signal message, the slave device can update the PWM frequency, the duty ratio and the start-stop state to keep the same with the master device, thereby realizing the control of synchronous frequency conversion and duty ratio of the CPS ground cabinet.
S6: the slave device analyzes PWM frequency, duty cycle and start-stop information from the acquired synchronous signal message.
S7: the master equipment and the slave equipment realize stable resonant frequency through a bilateral LCC resonant network, and realize synchronous control of PWM frequency, duty ratio and start and stop of a plurality of CPS ground cabinets according to synchronous signal messages under the stable resonant frequency. The method comprises the following steps:
taking a bilateral LCC resonant network as shown in fig. 3 as output ends of a master device and a slave device, wherein the bilateral LCC resonant network comprises an input power supply Uin, a high-frequency full-bridge inverter circuit, a primary side LCC compensation network, a transformer, a secondary side LCC compensation network and an equivalent load Req, the primary side LCC compensation network comprises switching tubes S1-S4 of an inverter, and the primary side LCC compensation network comprises a compensation inductance L f1 And two compensation capacitors C 1 、C f1 The transformer comprises a coupling coil L 1 、L 2 The secondary side LCC compensation network comprises a compensation inductance L f2 And two compensation capacitors C 2 、C f2 ；
Setting the L f1 、C 1 、C f1 、L 1 、L 2 、L f2 、C 2 And C f2 The values of (2) satisfy:
where f represents the resonant frequency.
When the value of the formula (1) is satisfied, the secondary side reflection load Z r The method comprises the following steps:
wherein M represents mutual inductance.
At this time, the Root Mean Square (RMS) value i of the high-frequency primary side current ip p The method can be solved as follows:
i p ＝u AB /2πfL f1 (3)，
wherein u is AB Representing the bus voltage.
As can be seen from equation (3), even in two coils L 1 、L 2 Under the decoupling condition, the primary side current ip and the secondary side reflection load Z r Nor is it relevant. At this time, the current i is output sac It can be calculated as:
as can be seen from the formula (4), the output current of the bilateral LCC resonant network is a constant value, and the resonant element parameter L adapting to the load current requirement is set f1 、C 1 、C f1 、L 1 、L 2 、L f2 、C 2 And C f2 It is possible to realize that the output current is not affected by Z r To produce fluctuations in the supply of electrical energy, achieving a stable resonance frequency.
Each CPS ground cabinet collects the resonance frequency of the CPS ground cabinet and sends the CPS ground cabinet to an upper computer through a control bus, the upper computer calculates PWM frequency, duty cycle and start-stop information required by the current load by combining the resonance frequency, and sends corresponding synchronous control instructions to a master device, and the master device sends the synchronous control instructions to each slave device through the control bus;
the master device performs synchronous overturning according to the PWM frequency in the synchronous control instruction, and controls the on-off of a switching tube of an inverter in the master device according to the PWM frequency, the duty ratio and the start-stop information in the synchronous control instruction. The synchronous turning refers to the action description that the slave device starts to execute driving along with the master device with the same frequency, duty ratio and other information after determining the synchronous position. In the practical application scene, each CPS ground cabinet is very close to each other, and the time delay of master and slave equipment is negligible by using a high-frequency signal cable.
The slave device synchronously turns over according to the PWM frequency analyzed in the synchronous signal message in S6, and controls the on-off of the switching tube of the inverter in the slave device according to the PWM frequency analyzed in the synchronous signal message in S6, the duty ratio and the start-stop information, so that the synchronous control of a plurality of CPS ground cabinets is realized.
Example two
The invention also discloses a synchronous control system of the multi-CPS ground cabinet, which comprises a control bus, a plurality of CPS ground cabinets which are connected in parallel and connected with the control bus, a master equipment judging module, a synchronous information generating module, a synchronous information receiving and transmitting module and a synchronous control module, wherein the control bus comprises a power bus, a synchronous bus and a communication bus, and the CPS ground cabinet comprises an inverter.
The master equipment adjudication module is used for enabling the CPS ground cabinets to send a busy request message to the control bus, the control bus selects CPS ground cabinets with successful busy as master equipment, and other CPS ground cabinets are used as slave equipment. The synchronous information generation module is used for enabling the main equipment to receive the synchronous control instruction sent by the upper computer through the control bus and generate a synchronous signal message, wherein the synchronous signal message comprises PWM frequency, duty ratio and start-stop information of CPS ground cabinet work. The synchronous information receiving and transmitting module is used for enabling the master device to periodically broadcast synchronous signal messages through the control bus, and the slave device obtains the synchronous signal messages through the control bus. The synchronous control module is used for enabling the master equipment and the slave equipment to achieve stable resonant frequency through the bilateral LCC resonant network, and achieving synchronous control of the CPS ground cabinets according to the synchronous signal message under the stable resonant frequency.
In this embodiment, the inverter includes a low-power ac transformer, a high-power ac transformer, and a power boost circuit; the output end of the CPS ground cabinet is connected in parallel with the input end of the power lifting circuit through the low-power alternating-current transformer, and the output end of the power lifting circuit is connected into a wireless electric energy transmitter consisting of an energy transmitting coil and a tuning capacitor through the high-power alternating-current transformer, namely the power bus, so that high-power wireless energy transmission is realized. The control end of the inverter of the CPS ground cabinet is connected to the synchronous bus, and the on-off of the switching tube of the inverter of the CPS ground cabinet is controlled through the synchronous bus to realize synchronous control. The control end of the inverter of the CPS ground cabinet is also connected to the communication bus and communicates with the outside through the communication bus.
When each CPS ground cabinet works, electricity can be taken from a plurality of independent power supplies as shown in figure 1 or from an alternating current bus. The output end of each CPS ground cabinet enters the track after passing through a compensation circuit formed by an inductor and two capacitors, a phase and frequency induction device is additionally arranged at the joint of the two tracks, high-frequency current on the track is coupled to the inductor, and the current frequency and phase can be obtained through induced current sampling. The high-frequency induction signal is transmitted into an inversion module driver of the slave device through a high-frequency driving transformer to change the voltage into voltage acceptable by the driver, and the switching frequency and the phase of the adjacent slave device are controlled. The multiple inverters can realize synchronous change of PWM frequency, duty ratio and start-stop state under the control of the synchronous bus, so that pulse width modulation lockstep between parallel inverters is effectively ensured, PWM output is stopped before the slave equipment does not acquire an accurate synchronous signal message, and therefore, the influence on other inverters is avoided. The input end of the power boosting circuit can keep synchronous input, and the redundancy characteristic of the system is improved.
Example III
The invention also discloses a computer readable storage medium, on which a computer program is stored, which when being executed by a processor implements the multi-CPS floor cabinet synchronization control method.
Example IV
The invention also discloses a device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the multi-CPS ground cabinet synchronous control method when executing the computer program.
Compared with the prior art, the invention has the advantages that:
(1) The CPS ground cabinets are connected through the control bus, the selection of the master equipment and the slave equipment is judged by the control bus, the probability that each CPS ground cabinet becomes the master equipment is the same, the synchronous control signals and the working state information are transmitted through the control bus, and an additional optical fiber circuit or a conversion module is not needed in the synchronous control process; and the newly added CPS ground cabinet can be expanded only by connecting a control bus, so that the running and maintenance cost of the whole equipment can be effectively reduced.
(2) Synchronous control is carried out by sending a synchronous message containing PWM frequency, duty cycle and start-stop information through a control bus, and the control of the PWM frequency, the duty cycle and the start-stop of each CPS ground cabinet is realized while the synchronous control is carried out; and the periodic message receiving and transmitting mode can adaptively and synchronously adjust the working states of all CPS control cabinets according to load change, can meet the control requirements of synchronous track current phase and synchronous power control of a plurality of CPS ground cabinets in a wireless energy transmission system, and realizes more effective synchronous control.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The synchronous control method of the multi-CPS ground cabinet is characterized by comprising the following steps of:
the CPS ground cabinets are connected with a control bus and send a busy request message to the control bus, the control bus selects CPS ground cabinets with successful busy as main equipment, and other CPS ground cabinets are used as auxiliary equipment;
the master device receives a synchronous control instruction through the control bus and generates a synchronous signal message, wherein the synchronous signal message comprises PWM frequency, duty cycle and start-stop information of CPS ground cabinet work;
the master device periodically broadcasts the synchronous signal message through the control bus, and each slave device acquires the synchronous signal message through the control bus;
and the master equipment and each slave equipment realize stable resonant frequency through a bilateral LCC resonant network, and synchronous control of a plurality of CPS ground cabinets is realized according to the synchronous signal message under the stable resonant frequency.
2. A multi-CPS ground cabinet synchronization control method as claimed in claim 1, wherein: the master device periodically broadcasts the synchronization signal message through the control bus, and each slave device acquires the synchronization signal message through the control bus, which specifically comprises:
the master device sets a master synchronization point and a synchronization time period, and combines the master synchronization point to broadcast the synchronization signal message periodically through the control bus according to the synchronization time period;
setting a preset time for judging whether the master device or each slave device is normal, and if the slave device does not successfully acquire the synchronous signal message on the control bus within the preset time, the control bus reselects the CPS ground cabinet with successful line occupation as the master device; and if each slave device successfully acquires the synchronous signal message from the control bus within the preset time, each slave device analyzes PWM frequency, duty ratio and start-stop information from the acquired synchronous signal message.
3. A multi-CPS ground cabinet synchronization control method as claimed in claim 2, wherein: and the slave device analyzes the PWM frequency, the duty ratio and the start-stop information from the obtained synchronous signal message, checks the obtained synchronous signal message, analyzes the synchronous signal message if the check is successful, and re-acquires the synchronous signal message on the control bus if the check is failed.
4. A multi-CPS ground cabinet synchronization control method as claimed in claim 1, wherein: the master device and each slave device realize stable resonance frequency through a bilateral LCC resonance network, specifically:
taking a bilateral LCC resonant network as output ends of the master equipment and each slave equipment, wherein the bilateral LCC resonant network comprises a high-frequency full-bridge inverter circuit, a primary LCC compensation network, a transformer and a secondary LCC compensation network; the primary side LCC compensation network comprises a switching tube of an inverter and comprises a compensation inductance L f1 And two compensation capacitors C 1 、C f1 The transformer comprises a coupling coil L 1 、L 2 The secondary side LCC compensation network comprises a compensation inductance L f2 And two compensation capacitors C 2 、C f2 ；
Setting the L f1 、C 1 、C f1 、L 1 、L 2 、L f2 、C 2 And C f2 The values of (2) satisfy:
where f represents the resonant frequency.
5. A multi-CPS ground cabinet synchronization control method as claimed in claim 2, wherein: and each slave device takes the time for acquiring the synchronous signal message as a slave synchronous point, and sets the position of the slave synchronous point according to the slave synchronous point and the data transmission time delay between the slave device and the master device.
6. A multi-CPS ground cabinet synchronization control method as defined in claim 5, wherein: and realizing synchronous control of a plurality of CPS ground cabinets according to the synchronous signal message under the stable resonant frequency, wherein the synchronous control comprises the following specific steps:
each CPS ground cabinet collects the resonance frequency of the CPS ground cabinet and sends the CPS ground cabinet to an upper computer through the control bus, the upper computer calculates PWM frequency, duty cycle and start-stop information required by the current load by combining the resonance frequency, and sends corresponding synchronous control instructions to the master equipment, and the master equipment sends the synchronous control instructions to each slave equipment through the control bus;
the master equipment synchronously turns over according to the PWM frequency in the synchronous control instruction, and controls the on-off of a switching tube of an inverter in the master equipment according to the PWM frequency, the duty ratio and the start-stop information in the synchronous control instruction;
and each slave device synchronously turns according to the PWM frequency analyzed in the synchronous signal message, and controls the on-off of a switching tube of an inverter in each slave device according to the PWM frequency analyzed in the synchronous signal message, the duty cycle and the start-stop information.
7. A multi-CPS floor cabinet synchronization control system, comprising:
the control bus is used to control the control bus,
a plurality of CPS ground cabinets, each CPS ground cabinet being connected with the control bus;
the master equipment judging module is used for enabling the CPS ground cabinets to send a line occupying request message to the control bus, wherein the control bus selects CPS ground cabinets with successful line occupying as master equipment and other CPS ground cabinets as slave equipment;
the synchronous information generation module is used for enabling the main equipment to receive a synchronous control instruction through the control bus and generate a synchronous signal message, wherein the synchronous signal message comprises PWM frequency, duty ratio and start-stop information of CPS ground cabinet work;
the synchronous information receiving and transmitting module is used for enabling the master equipment to periodically broadcast the synchronous signal message through the control bus, and each slave equipment obtains the synchronous signal message through the control bus;
and the synchronous control module is used for enabling the master equipment and each slave equipment to realize stable resonant frequency through a bilateral LCC resonant network, and realizing synchronous control of a plurality of CPS ground cabinets according to the synchronous signal message under the stable resonant frequency.
8. A multi-CPS floor cabinet synchronization control system as recited in claim 7, wherein: the CPS ground cabinet comprises an inverter;
the inverter comprises a low-power alternating-current transformer, a high-power alternating-current transformer and a power boosting circuit; the output end of the CPS ground cabinet is connected in parallel with the input end of the power lifting circuit through the low-power alternating-current transformer, and the output end of the power lifting circuit is connected into the power bus through the high-power alternating-current transformer to realize wireless energy transmission;
the control end of the inverter of the CPS ground cabinet is connected to the synchronous bus, and the on-off of a switching tube of the inverter of the CPS ground cabinet is controlled through the synchronous bus to realize synchronous control;
the control end of the inverter of the CPS ground cabinet is also connected to the communication bus and communicates with the outside through the communication bus.
9. A computer-readable storage medium having stored thereon a computer program, characterized by: which when executed by a processor implements a multi-CPS ground cabinet synchronization control method as claimed in any one of claims 1-6.
10. A synchronous control device of a multi-CPS ground cabinet is characterized in that: comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing a multi-CPS floor cabinet synchronization control method as claimed in any one of claims 1-6 when said computer program is executed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311365418.8A CN117595521A (en) | 2023-10-20 | 2023-10-20 | Multi-CPS ground cabinet synchronous control method, system, medium and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311365418.8A CN117595521A (en) | 2023-10-20 | 2023-10-20 | Multi-CPS ground cabinet synchronous control method, system, medium and equipment |
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| CN117595521A true CN117595521A (en) | 2024-02-23 |
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| CN202311365418.8A Pending CN117595521A (en) | 2023-10-20 | 2023-10-20 | Multi-CPS ground cabinet synchronous control method, system, medium and equipment |
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| Country | Link |
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| CN (1) | CN117595521A (en) |
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