CN113054646B - Wireless shore power system based on double-layer control - Google Patents

Wireless shore power system based on double-layer control Download PDF

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CN113054646B
CN113054646B CN202110331012.2A CN202110331012A CN113054646B CN 113054646 B CN113054646 B CN 113054646B CN 202110331012 A CN202110331012 A CN 202110331012A CN 113054646 B CN113054646 B CN 113054646B
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module
power supply
power
wireless
voltage
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CN113054646A (en
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孙盼
吴旭升
孙军
蔡进
何笠
杨刚
熊义勇
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Naval University of Engineering PLA
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • 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
    • 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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a wireless shore power system based on double-layer control. The system comprises: the hybrid power supply system comprises a hybrid power supply module and a layered control module, wherein the hybrid power supply module comprises a wireless power supply module, a battery module and a super capacitor module which are mutually connected in parallel; the layered control module comprises an upper control module and a lower control module, the upper control module is used for calculating the power required to be compensated by the hybrid power supply module according to the voltage difference between the actual power supply voltage of the hybrid power supply module and the preset power supply voltage, determining the power required to be compensated to be distributed among the wireless power supply module, the battery module and the super-capacitor module, and the lower control module is used for realizing the tracking regulation of the distributed power of the wireless power supply module, the battery module and the super-capacitor module. The invention realizes power cooperation among various power supply modes through double-layer control and inhibits load voltage disturbance brought by load switching.

Description

Wireless shore power system based on double-layer control
Technical Field
The invention belongs to the technical field of control of wireless shore power systems, and particularly relates to a wireless shore power system based on double-layer control.
Background
The ship adopting full electric propulsion can simplify and optimize the overall design of a cabin and the arrangement of a power system, has the advantages of saving energy, improving the concealment of the ship and the like, and is the development direction of the future ship. When a ship is parked at an island or a mother port, shore power is adopted to replace a diesel engine or a gas engine power generation system on the ship, and the ship has the advantages of energy conservation, environmental protection, precious ship fuel saving and the like. For ships, the operation process of connecting the shore power supply system by using the cable is complex, and the requirement of rapid and efficient deployment of wartime equipment cannot be met. In addition, different ships have different ship electricity voltage grades, and a plurality of sets of shore power transformers with different voltage grades are generally required to be equipped to meet the requirements of the ships with different voltage grades. This adds complexity to the interface planning, construction and maintenance of the shore power system.
Therefore, when a ship is parked at an island or a mother port, the most suitable power supply method is wireless shore power. The cable connection between the ship and the shore power supply is replaced by a wireless mode, and the ship-shore power supply has the advantages of good concealment, quickness and convenience in deployment and the like, and can better meet the requirement of equipment for quick deployment. Meanwhile, the ship power supply has the advantage of conveniently adjusting the voltage, so that the requirements of ship power systems with different voltage levels are met, the problem that different transformers need to be configured for ships with different voltage levels in a traditional mode is solved, and the site requirements and the investment cost of facility construction are saved.
However, the above-described wireless shore power system also has the following disadvantages. (1) Because the wireless shore power is supplied by adopting a coil coupling mode, high-power impact such as electromagnetic emission can interfere with a load, and the system is not favorable for stable operation and safe operation. (2) An energy storage device is also added to maintain the power supply balance of the system, and when the load suddenly increases, the stored energy is fed back to the ship.
Disclosure of Invention
Aiming at least one defect or improvement requirement in the prior art, the invention provides a wireless shore power system based on double-layer control, which realizes power coordination among multiple power supply modes and inhibits load voltage disturbance brought by load switching through double-layer control.
In order to achieve the above object, the present invention provides a wireless shore power system based on double-layer control, comprising:
the hybrid power supply system comprises a hybrid power supply module and a layered control module, wherein the hybrid power supply module comprises a wireless power supply module, a battery module and a super capacitor module which are mutually connected in parallel;
the layered control module comprises an upper control module and a lower control module, the upper control module is used for calculating the power required to be compensated by the hybrid power supply module according to the voltage difference between the actual power supply voltage of the hybrid power supply module and the preset power supply voltage, determining the power required to be compensated to be distributed among the wireless power supply module, the battery module and the super-capacitor module, and the lower control module is used for realizing the tracking regulation of the distributed power of the wireless power supply module, the battery module and the super-capacitor module.
Preferably, the upper control module includes:
the voltage acquisition module is used for acquiring the actual power supply voltage of the hybrid power supply module;
the power calculation module is used for calculating the power required to be compensated by the hybrid power supply module according to the voltage difference between the actual power supply voltage and the preset power supply voltage of the hybrid power supply module;
the decomposition module is used for decomposing high-frequency components and low-frequency components from power to be compensated;
and the distribution module is used for determining the power distribution of the high-frequency component between the wireless power supply module and the super capacitor module and the power distribution of the low-frequency component between the wireless power supply module and the battery module according to a preset power supply proportion.
Preferably, the wireless power supply module comprises an inverter, and the hierarchical control module controls the output power of the wireless power supply module by controlling the phase-shifting duty cycle of the inverter.
Preferably, the battery module comprises a first dual active bridge DC-DC conversion module, and the hierarchical control module controls the output power of the battery module by controlling the phase-shifted duty cycle of the first dual active bridge DC-DC conversion module.
Preferably, the super capacitor module comprises a second dual-active bridge DC-DC conversion module, and the hierarchical control module controls the output power of the super capacitor module by controlling the phase-shift duty cycle of the second dual-active bridge DC-DC conversion module.
Preferably, the acquisition of the actual supply voltage of the hybrid power supply module comprises the steps of:
setting a sampling period, and continuously sampling for multiple times according to the preset sampling period to obtain a piezoelectric sequence of the actual power supply voltage of the hybrid power supply module;
and sequencing the piezoelectric sequences, taking out the voltage values of the preset number in the middle of the sequenced sequences, and taking the average value of the taken-out voltage values as the actual power supply voltage of the hybrid power supply module.
Preferably, the upper control module and the lower control module are integrated on the same chip.
Preferably, the capacitance value of the super capacitor module is designed according to the transient power and the transient power duration of the super capacitor module.
In general, compared with the prior art, the invention has the following beneficial effects: the wireless shore power pulse load interference suppression with hybrid energy storage is realized by adopting double-layer control, the upper layer is power cooperative control and is used for decomposing high and low frequency components of pulse power and distributing power among wireless shore power, a lithium battery and a super capacitor, and the whole system is more stable in operation and smaller in energy loss through power distribution. The lower layer adopts a power closed-loop control method to realize the tracking of wireless shore power and hybrid energy storage on respective distributed power, so that the wireless shore power, the lithium battery and the super capacitor can stably operate on the set power.
Drawings
Fig. 1 is a schematic structural diagram of a wireless shore power system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an inverter of the wireless power supply module of an embodiment of the present invention;
FIG. 3 is a schematic diagram of wireless power transmission of a wireless power supply module according to an embodiment of the invention;
FIG. 4 is a circuit diagram of a rectifier of a wireless power supply module of an embodiment of the present invention;
FIG. 5 is a circuit diagram of a dual active bridge DC-DC conversion module of an embodiment of the present invention;
FIG. 6 is a flow chart of upper layer power coordination control according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a voltage signal acquisition circuit according to an embodiment of the present invention;
fig. 8 is a flowchart of the lower layer power closed loop control according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a wireless shore power system based on double-layer control, which comprises: hybrid power supply module and layering control module.
The hybrid power supply module comprises a wireless power supply module, a battery module and a super capacitor module which are connected in parallel. The battery module is preferably a lithium battery.
The layered control module comprises an upper control module and a lower control module, the upper control module is used for calculating the power to be compensated of the hybrid power supply module according to the voltage difference between the actual power supply voltage and the preset power supply voltage of the hybrid power supply module and determining the power distribution of the power to be compensated among the wireless power supply module, the battery module and the super capacitor module, and the lower control module is used for realizing the tracking regulation of the distributed power of the wireless power supply module, the battery module and the super capacitor module.
According to the invention, the power distribution among the wireless shore power, the battery and the super capacitor can be realized through the upper layer power cooperative control, so that the stable operation of the system can be more conveniently mastered; the upper layer firstly performs power distribution and then the lower layer performs tracking, so that the method can be more effectively adapted to the situation of wide power amplitude change in actual production and work, and has practical production significance.
Preferred implementations are described in detail below.
The wireless shore power system comprises an MCU, an inverter, a rectifier, two double-active-bridge DC-DC converters, a lithium battery, a super capacitor and a double coil for wireless power transmission. The layered control module is realized by adopting an MCU, and the upper layer control module and the lower layer control module are integrated on the MCU. And selecting an MCU type STM32F1 series chip as a main control chip of the system. The wireless power supply module comprises an inverter, a rectifier and a coupling coil. The battery module comprises a first double-active-bridge DC-DC conversion module and a lithium battery. The super capacitor module comprises a second double-active bridge DC-DC conversion module and a super capacitor. The first and the second are only used for distinguishing two double-active bridge DC-DC conversion modules, and do not represent that the two modules exist in sequence. The wireless power supply module is also connected with an AC/DC converter to convert the alternating current obtained by the inverter into direct current again, and then is connected with the voltage output by the two double-active-bridge DC-DC conversion modules into a medium-voltage direct current bus on the ship together.
The inverter circuit of the wireless power supply module is shown in fig. 2, and is composed of four IGBTs, which are named VT1, VT2, VT3 and VT4 respectively. The phase shift angles of VT1 and VT2, VT3 and VT4 are always kept 180 degrees phase difference, when the phase shift angles of VT1 and VT3 are the same, the output voltage of the alternating current end is zero, and when the phase difference of VT1 and VT3 is gradually increased, the output alternating current voltage is also gradually increased, therefore, the amplitude of the alternating current voltage can be changed by adjusting the phase shift angle of the inverter, so that the end voltage of the load can be changed.
The obtained alternating current is transmitted by the wireless power transmission device of the magnetic coupling resonance type with the double coils, as shown in a schematic diagram of the wireless power transmission in fig. 3, according to the lorentz theory and the electromagnetic induction theory, a changing electric field can generate a changing magnetic field in the surrounding space, namely, a sending end coil generates a changing magnetic field around the coil under the action of the alternating current, and when the magnetic flux in a closed loop changes, an induced electromotive force can be generated in the loop, so that the alternating current with the same frequency is induced in a receiving end coil, and the power transmission of the two coils through the magnetic field coupling is realized.
As shown in fig. 4, the rectifier circuit rectifies the ac power received by the receiving-end coil and converts the rectified ac power into dc power, so that the dc power can be connected to a medium-voltage dc bus. The circuit consists of 4 thyristors, named VT1, VT2, VT3 and VT4 respectively. When the output end alternating current signal is positive voltage, VT1 and VT4 are conducted, the current direction of the output end is from top to bottom, and when the output end alternating current signal is negative voltage, VT2 and VT3 are conducted, the current direction of the output end is still from top to bottom, and a stable direct current voltage can be obtained at the output end through the action of a filter capacitor, so that the direct current voltage is connected into a medium-voltage direct current bus.
For lithium batteries and super capacitors, a bidirectional DC-DC converter is needed to supply power to the medium-voltage DC bus by the lithium batteries and the super capacitors in a low power consumption state and charge the lithium batteries and the super capacitors by the medium-voltage DC bus in a multiple power consumption state. The dual-active DC-DC conversion module adopted in the embodiment of the present invention has the same principle as the above-mentioned wireless shore power inverter, but an inverter circuit diagram is constructed on both sides of the lithium battery or super capacitor and the medium-voltage DC bus, and then the ac sides of the two inverters are connected by the transformer, as shown in fig. 5. In the actual use process, which party needs to be used as a sending end, and then a control signal is sent to the IGBT of which party, so that the bidirectional DC-DC conversion can be realized.
The hierarchical control method of the MCU will be described in detail below.
The power distribution of the wireless shore power, the lithium battery and the super capacitor is realized through the upper control module, and the closed loop tracking of the distributed power of the wireless power supply module, the battery module and the super capacitor module is realized through the lower control module. The upper control module and the lower control module are integrated in the MCU, the upper control module adopts droop control, the control quantity is the phase shift angle of the inverter of the wireless power supply module, the lower control module adopts PID control, and the control quantity is the phase shift angle of the double-active-bridge DC-DC converter. The alternating current obtained by the wireless shore power through the inverter can be wirelessly transmitted through the double-coil magnetic coupling resonant wireless power transmission device, and the direct current obtained by the receiving end is output to the medium-voltage direct current bus through the rectifier after being received by the receiving end. And the lithium battery and the super capacitor realize the power supply of the lithium battery and the super capacitor to the medium-voltage direct-current bus in the low power and the charging of the lithium battery and the super capacitor by the medium-voltage direct-current bus in the multi power by controlling the phase shift angle of the bidirectional DC-DC converter. The control quantity output by the controller is used for controlling the phase shift angle of the wireless shore power inverter or the double-active-bridge DC-DC converter, so that the purpose of tracking the power of the wireless shore power, the lithium battery and the super capacitor is achieved.
The upper control module includes: the voltage acquisition module is used for acquiring the actual power supply voltage of the hybrid power supply module; the power calculation module is used for calculating the power to be compensated of the hybrid power supply module according to the voltage difference between the actual power supply voltage and the preset power supply voltage of the hybrid power supply module; the decomposition module is used for decomposing high-frequency components and low-frequency components from power to be compensated; and the distribution module is used for determining the power distribution of the high-frequency component between the wireless power supply module and the super capacitor module and the power distribution of the low-frequency component between the wireless power supply module and the battery module according to a preset power supply proportion.
The detailed flow chart of the upper layer cooperative power control is shown in fig. 6, wherein U BUS_REF 、[U BUS ]、ΔU BUS Rated voltage of a medium-voltage direct-current bus of the ship, an actually-measured piezoelectric sequence and voltage error are respectively obtained; 1/m is a droop coefficient; Δ P is the power difference to be compensated; LPF is low pass filter, and high frequency power value delta P needing compensation is calculated according to delta P high And low frequency power value Δ P low (ii) a The proportion of the low-frequency power value born by the wireless shore power is k WPT_L The ratio borne by the lithium battery is 1-k WPT_L (ii) a The proportion of the high-frequency power value born by the wireless shore power is k WPT_H The ratio borne by the supercapacitor is 1-k WPT_H (ii) a The total power borne by the wireless shore power, the lithium battery power and the super capacitor power are respectively delta P WPT 、ΔP BAT And Δ P SC 。
Firstly, the rated voltage U of the medium-voltage direct-current bus is assumed BUS_REF The voltage of the medium-voltage direct-current bus is 500V, the highest voltage of the medium-voltage direct-current bus under normal operation does not exceed 550V, the voltage of the direct-current bus is divided by resistors of 109K Ω and 1K Ω to obtain a voltage in a 0-5V change range, a voltage retainer is constructed by an OPA171 chip, and the voltage of the output end of the voltage retainer is still 0-5V, as shown in fig. 7.
In order to realize the control strategy of the upper layer power cooperative control, realize the sampling and the related calculation of the voltage and the current, an MCU type STM32F1 series chip can be selected,because the ADC module is arranged in the STM32F1 series chip, and the acceptable voltage range is between 0V and 5V, the voltage of 0V to 5V at the output end of the voltage retainer can be directly connected to the corresponding ADC pin of the STM32F1 chip, and the actual voltage on the medium-voltage direct-current bus can be obtained by multiplying the voltage amplitude by 110 times after the discrete sampling of the MCU. In order to prevent error data possibly caused by external interference, the sampling period is set to be 1ms, and 10 times of continuous acquisition are carried out to obtain a piezoelectric sequence [ U ] BUS ]. First pair piezoelectric sequence U BUS ]Sorting, averaging the 4 voltage values, and outputting the average value as the output U of the primary collected voltage BUS This makes it possible to eliminate the influence of an abnormal voltage value that is too large or too small due to a disturbance.
Will U BUS_REF And U BUS The difference between the two is used to obtain the voltage error delta U BUS And multiplying the error by a vertical coefficient 1/m to obtain a power difference value delta P needing to be compensated. Assuming that the rated medium-voltage dc bus voltage of the wireless shore power system is 500V, the rated active power is 20KW, and the voltage variation range of the medium-voltage dc bus is required to be within 2%, the voltage droop coefficient m here is 2% × 500/20(V/KW) is 0.05 (V/KW).
And then software low-pass filtering is carried out through an STM32F1 chip, so that the low-frequency power value delta P needing compensation is obtained low Here, the software filtering algorithm uses the simplest first-order inertial filtering, and the specific expression is as follows: y (n) ═ α x (n) +(1- α) Y (n-1). In the formula: α ═ filter coefficient; x (n) this sample value; y (n-1) is the last filtered output value; y (n) is the current filtering output value. The smaller the filter coefficient, the smoother the filtering result, but the lower the sensitivity; the larger the filter coefficient, the higher the sensitivity, but the more unstable the filtering result. The invention selects the preferable filtering effect with the filtering coefficient alpha being 0.1, and can better separate high and low frequency signals.
The total power Δ P to be compensated minus the low frequency power Δ P to be compensated low Then the high frequency power value delta P needing compensation can be obtained high Then, the two are respectively mixed according to the proportion k WPT_L And k WPT_H Distributed to wireless shore power, lithium batteries and super capacitors,
the power distributed by the lithium battery is as follows: delta P BAT ＝(1-K WPT_L )×ΔP low ，
The power distributed by the super capacitor is as follows: delta P SC ＝(1-K WPT_H )×ΔP high ，
And the wireless shore power simultaneously compensates high and low frequencies, and is obtained by adding two parts: delta P WPT ＝K WPT_L ×ΔP low +K WPT_H ×ΔP high 。
The PID parameter of the controller is set to be P0.05, I0.2 and D0.01, so that the power of the wireless shore power, the lithium battery and the super capacitor can be well distributed.
The flow chart of the lower layer power closed loop control is shown in fig. 8. The power distributed by the upper layer to the lower layer is obtained, and the three parts respectively adopt a closed-loop control mode to track the power distributed by the upper layer. The system comprises a lithium battery, a super capacitor, an inverter, a medium-voltage direct-current bus, a double-active-bridge DC-DC converter, a super capacitor, a power supply and a power supply, wherein the wireless shore power is subjected to closed-loop control, then is converted into alternating current through the inverter, is converted into direct current through AC/DC conversion, and then is connected to the medium-voltage direct-current bus, the power supply is subjected to closed-loop control through the lithium battery, the power supply is subjected to electric energy transmission on the lithium battery and the medium-voltage direct-current bus through the double-active-bridge DC-DC converter, and the super capacitor control scheme is the same as that of the lithium battery.
In order to realize the three closed-loop control of the wireless shore power, the lithium battery and the super capacitor and realize AD sampling and related calculation, the three closed-loop control is completed by a main control chip STM32F1 series, voltage signals on the wireless shore power, the lithium battery and the super capacitor can access 0-5V voltage output by a voltage retainer to ADC pins corresponding to the STM32F1 series chip through a voltage signal acquisition circuit diagram in figure 3, and only the resistance value of RH is required to be changed into the corresponding divider resistance value. And then, calculating to obtain the digital quantity of the voltage signal through a main control chip, and multiplying the voltage value by the corresponding voltage division multiple to obtain the real voltage value of the wireless shore power, the lithium battery and the super capacitor. The acquisition of current signals can respectively acquire the current in the wireless shore power, the lithium battery and the super capacitor loop through the ACS712ELC-30A chip, the chip detects the current based on the Hall effect, the detection range can reach 30A, and the requirement of the system can be completely met.
And multiplying the detected voltage signal and current signal to obtain an actual power sequence, subtracting the distributed expected power, and inputting the difference into a PID controller to obtain a corresponding control quantity. The power of the wireless shore power is controlled through the phase-shifting duty ratio of the inverter, and the power of the lithium battery and the super capacitor is controlled through the phase-shifting duty ratio of the double-active-bridge DC-DC converter.
Considering that the transient power maintained by the super capacitor may be much larger than the rated power in the actual system operation, the transient power maintained by the super capacitor is now 40KW, and the required duration is 2s, and the required capacity of the super capacitor can be calculated according to the following method.
According to the theory of energy conservation: the energy required for maintaining the normal operation of the system transient state is the energy reduced during the discharge period of the super capacitor. The energy required for maintaining the normal operation of the equipment is W1, the energy reduced by the super capacitor is W2, and the following should be provided: w 1 ＝W 2
Joule's law, formula for electric power and formula for current intensity are defined as follows:
W＝Pt
P＝UI
Figure BDA0002994391350000081
from the above formula, one can obtain: when the super capacitor discharges outwards, the voltage at two ends of the capacitor gradually decreases, so when the super capacitor does work outwards for a certain time, the discharged electric quantity delta Q is related to the initial voltage of the super capacitor and the discharged voltage.
And setting the initial voltage of the super capacitor as U1, the electric quantity in the capacitor as Q1, the voltage after discharging as U2 and the electric quantity in the capacitor as Q2. The integral of the decreasing energy W of the super capacitor with the change of the voltage is:
Figure BDA0002994391350000091
it can be assumed that the efficiency of the DC-DC voltage regulator circuit is 98%, there are:
W 1 ＝W 2 ×98％＝0.49C(U 1 +U 2 )(U 1 -U 2 )
assuming that the initial voltage of the super capacitor is 10V, after 2s of operation, the voltage is reduced to 4V, and the data are substituted to obtain the nominal capacitance of 1943F. Considering the problem of capacitance error of the capacitor, a super capacitor of 10V and 2000F can be selected to ensure the transient operation of the device for 2 s.
And the lithium battery is 24V500AH standard lithium battery, which can supply power for more than half an hour to the bus and can completely meet various power requirements.
The upper control module and the lower control module are connected through the power distributed by the upper layer, and therefore complete layered control of the wireless shore power system based on double-layer control can be achieved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. A wireless shore power system based on double-layer control, comprising:
the hybrid power supply system comprises a hybrid power supply module and a layered control module, wherein the hybrid power supply module comprises a wireless power supply module, a battery module and a super capacitor module which are mutually connected in parallel;
the hierarchical control module comprises an upper control module and a lower control module, the upper control module is used for calculating the power to be compensated of the hybrid power supply module according to the voltage difference between the actual power supply voltage and the preset power supply voltage of the hybrid power supply module and determining the power distribution of the power to be compensated among the wireless power supply module, the battery module and the super-capacitor module, and the lower control module is used for realizing the tracking regulation of the distributed power of the wireless power supply module, the battery module and the super-capacitor module;
the upper control module includes:
the voltage acquisition module is used for acquiring the actual power supply voltage of the hybrid power supply module;
the power calculation module is used for calculating the power required to be compensated by the hybrid power supply module according to the voltage difference between the actual power supply voltage and the preset power supply voltage of the hybrid power supply module;
the decomposition module is used for decomposing high-frequency components and low-frequency components from power to be compensated;
and the distribution module is used for determining the power distribution of the high-frequency component between the wireless power supply module and the super-capacitor module and the power distribution of the low-frequency component between the wireless power supply module and the battery module according to a preset power supply proportion.
2. The wireless shore power system based on double-layer control of claim 1, wherein said wireless power supply module comprises an inverter, and said hierarchical control module controls the output power of said wireless power supply module by controlling the phase-shifted duty cycle of said inverter.
3. The wireless shore power system based on two-tier control of claim 1, wherein said battery module comprises a first dual active bridge DC-DC conversion module, said hierarchical control module controlling the output power of said battery module by controlling the phase-shifted duty cycle of said first dual active bridge DC-DC conversion module.
4. The wireless shore power system based on two-tier control of claim 1, wherein said super capacitor module comprises a second dual active bridge DC-DC conversion module, and said tier control module controls output power of said super capacitor module by controlling a phase-shifted duty cycle of said second dual active bridge DC-DC conversion module.
5. The wireless shore power system based on double-layer control as claimed in claim 1, wherein the collection of the actual supply voltage of the hybrid power supply module comprises the steps of:
setting a sampling period, and continuously sampling for multiple times according to the preset sampling period to obtain a piezoelectric sequence of the actual power supply voltage of the hybrid power supply module;
and sequencing the piezoelectric sequences, taking out the voltage values of the preset number in the middle of the sequenced sequences, and taking the average value of the taken-out voltage values as the actual power supply voltage of the hybrid power supply module.
6. The wireless shore power system based on double-layer control as claimed in claim 1, wherein said upper control module and said lower control module are integrated on the same chip.
7. The wireless shore power system based on double-layer control as claimed in claim 1, wherein the capacitance of the super capacitor module is designed according to the transient power and the transient power duration of the super capacitor module.
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