CN115149627B - Hybrid energy storage power supply device and power supply management method thereof - Google Patents

Hybrid energy storage power supply device and power supply management method thereof Download PDF

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Publication number
CN115149627B
CN115149627B CN202211050714.4A CN202211050714A CN115149627B CN 115149627 B CN115149627 B CN 115149627B CN 202211050714 A CN202211050714 A CN 202211050714A CN 115149627 B CN115149627 B CN 115149627B
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unit
module
super capacitor
power
power supply
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CN115149627A (en
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贺乐和
吴兴贵
帅建军
贺一雄
张勇平
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Spacety Co ltd Changsha
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Spacety Co ltd Changsha
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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention relates to a hybrid energy storage power supply device and a power supply management method thereof. The hybrid energy storage power supply device at least comprises a solar power generation unit, a storage battery unit, a super capacitor unit, a management unit and an output port. The storage battery unit and the super capacitor unit store electric energy generated by the solar power generation unit and supply power to the output port based on the control of the management unit. The battery cell and the supercapacitor cell are configured to: in the case of a change in the generated power of the solar power generation unit and/or the used power of the load, power is supplied to the output port in at least two ways of change in current in response to the control of the management unit. The storage battery unit and the super capacitor unit are connected to the management unit through the configured converter. The management unit is configured to: and controlling the working mode of the storage battery unit and/or the super capacitor unit by transmitting the duty ratio signal to the converter.

Description

Hybrid energy storage power supply device and power supply management method thereof
Technical Field
The invention relates to the technical field of satellite power supply, in particular to a hybrid energy storage power supply device and a power supply management method thereof.
Background
At present, most of artificial satellites use solar energy as energy input, due to the influence of the environment, particularly the influence of solar illumination, solar power generation is intermittent, loads in a satellite power grid are changed at any time due to time and external factors, so that an energy storage system is usually installed on the satellite, the energy storage system stores electric energy when the generated energy is sufficient, and the electric energy is released when the generated energy is in short supply to balance the power mismatch between renewable energy power generation and the loads in the satellite power grid, and therefore bus voltage is stabilized. With the use of hybrid energy storage power supply devices in satellites, research on energy management of satellite power supplies is increasing. Aiming at the defects that a nonlinear system is insufficient in robustness, poor in dynamic response and incapable of introducing boundary conditions, a linear control method is mostly adopted in the prior art. The linear control method needs real-time online prediction and optimization, and involves a large amount of matrix operations, so that the demand for computing resources is harsh, and the computing burden is heavy.
Aiming at the defects of the prior art, the invention provides a hybrid energy storage power supply device and a power supply management method thereof, which improve the energy management performance of a satellite power grid through a trigger type energy management strategy, and the power supply device can rapidly and dynamically respond to various changes of photovoltaic and load in the satellite power grid through a trigger condition which is reasonably designed while ensuring the effective operation of the satellite power grid, thereby realizing power balance, ensuring the stable bus voltage, and avoiding unnecessary operation and control action, thereby reducing the operation resource requirement and the switching loss.
Furthermore, on the one hand, due to the differences in understanding to those skilled in the art; on the other hand, since the applicant has studied a great deal of literature and patents when making the present invention, but the disclosure is not limited thereto and the details and contents thereof are not listed in detail, it is by no means the present invention has these prior art features, but the present invention has all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
The invention provides a hybrid energy storage power supply device. The hybrid energy storage power supply device at least comprises a solar power generation unit, a storage battery unit, a super capacitor unit, a management unit and an output port. The storage battery unit and the super capacitor unit store electric energy generated by the solar power generation unit and supply power to the output port based on control of the management unit. The battery cell and the supercapacitor cell are configured to: and under the condition that the generated power of the solar power generation unit and/or the power utilization of the load changes, responding to the control of the management unit, and supplying power to the output port in at least two changing ways of current. The storage battery unit and the super capacitor unit are connected to the management unit through configured converters. The management unit is configured to: and controlling the working mode of the storage battery unit and/or the super capacitor unit by transmitting a duty ratio signal to the converter. Preferably, the at least two ways of changing the current may refer to a change in magnitude of the current value and a change in direction of the current.
Preferably, the power supply device provided by the invention adjusts the power supply states (working modes) of the storage battery unit and the super capacitor unit by acquiring parameters of the power supply device and combining with trigger control and predictive control, so that the power supply device can realize quick dynamic response to various changes of the solar power generation unit and the load in the power grid, realize power balance and ensure stable bus voltage.
According to a preferred embodiment, said accumulator unit is connected to a transmission bus to receive the electric energy generated by said solar power unit and/or to supply said output port with electric energy. The battery unit includes a battery pack and a first inverter. The first converter is configured to: and controlling the charging and discharging states of the storage battery units in a manner of generating at least two changes of current in the storage battery pack in response to the duty ratio signal sent by the management unit.
According to a preferred embodiment, the supercapacitor unit is connected to a transmission bus to receive the electric energy generated by the solar power generation unit and/or to supply power to the output port. The super capacitor unit comprises a super capacitor and a second converter. The second converter is configured to: and controlling the charging and discharging states of the super capacitor unit by enabling the super capacitor to generate at least two changes of current in response to the duty ratio signal sent by the management unit.
Preferably, the first converter and the second converter are both half-bridge converters. Preferably, the first converter and the second converter use half-bridge converters of the same specification. Preferably, the half-bridge converter may be composed of one inductor and two switching diodes. Under the condition that the illumination intensity and/or the load power are/is changed, the first converter and the second converter respectively control the power supply states of the storage battery unit and the super capacitor unit in response to the control of the management unit, so that power balance is realized, and the stability of the bus voltage is ensured.
According to a preferred embodiment, the management unit comprises at least a sampling module and a verification module. The sampling module is configured to: and sampling various parameters in the power supply device. The parameters at least comprise the voltage value and the current value of the storage battery pack and/or the super capacitor. The verification module is configured to: and verifying whether the change of the generating power of the solar power generation unit and/or the power consumption of the load exceeds a preset threshold value or not within a preset period, and transmitting data to a rear end only under the condition that a verification result is true.
According to a preferred embodiment, the management unit further comprises a calculation module and an adjustment module. The calculation module is configured to: and under the condition that the verification module is true to the verification result, receiving the parameters collected by the sampling module, and calculating to generate two groups of duty ratio signals sent to the adjusting module. The adjustment module is configured to: in response to receipt of the duty cycle signal, inverting and halving the duty cycle signal and transmitting to the first converter or the second converter. Preferably, the two sets of duty cycle signals are a first duty cycle signal and a second duty cycle signal, respectively. Preferably, the duty cycle signal sent to the first converter is a first duty cycle signal. Preferably, the duty cycle signal sent to the second converter is a second duty cycle signal.
According to a preferred embodiment, the computing module is further configured to: and under the condition that the duty ratio signals are sent to the adjusting module, sending two groups of duty ratio signals to the verifying module so as to update the verifying conditions of the verifying module.
According to a preferred embodiment, the calculation module comprises at least a first calculation module and a second calculation module. The first computing module is connected to the second computing module via a filtering module. The first computing module is configured to: and under the condition that the verification module is true to the verification result, calculating a target value of the total current value required to be provided by the storage battery unit and the super capacitor unit based on the parameters collected by the sampling module. The first calculation module transmits the target value to the filtering module to divide the target value of the total value of the current required to be supplied by the storage battery unit and the super capacitor unit into the target value of the storage battery unit and the target value of the super capacitor unit.
The second computing module is configured to: and under the condition that the storage battery unit target value and the super capacitor unit target value are received through the filtering module, calculating and generating two groups of duty ratio signals. And the second calculation module transmits the duty ratio signal to the regulation module and the verification module respectively so as to complete the adjustment of the working mode of the storage battery unit and/or the super capacitor unit and the update of the verification condition of the verification module.
According to a preferred embodiment, the solar power generation unit is configured to: electric energy is generated based on a maximum power point tracking algorithm so as to realize maximum power output under different illumination intensities. Preferably, the solar power generation unit comprises a solar panel, a photovoltaic signal generator and a photovoltaic converter. The photovoltaic signal generator generates a third duty ratio signal for controlling the working state of the photovoltaic converter by using a maximum power point tracking algorithm, so that the solar power generation unit can realize maximum power output under different illumination intensities.
The management unit is configured to: and calculating an estimated value of the total current required to be provided by the storage battery pack and the super capacitor based on the state model and the electrical parameters.
Preferably, the equation of state using the present invention can be expressed as follows:
C*dV 0 (t)/dt=I 1 (t)+I 2 (t)*(1-Q 1 (t))+I 3 (t)*(1-Q 2 (t))-I 4 (t)；
wherein t is a time variable, C is a capacitance value of the bus capacitor, and V 0 For the voltage of the transmission bus, I 1 Is the output current of the solar power generation unit, I 2 Is the output current of the battery cell, Q 1 Is the first duty cycle signal, I 3 Is the output current, Q, of the supercapacitor 2 Is the second duty cycle signal, I 4 Is the load current.
The total value of the current required to be provided by the storage battery unit and the super capacitor unit is I 5 The expression is as follows:
I 5 =I 4 -I 1 ；
I 5 is estimated as I 6 The expression is as follows:
I 6 =(I 2 *(1-Q 1 )+I 3 *(1-Q 2 )-C*V 0 )*ω/(1+ω)；
preferably, the management unit may obtain the estimated value of the total current value required to be provided by the storage battery unit and the super capacitor unit by using local information, namely, the capacitance value of the bus capacitor, the transmission bus voltage, the output current of the storage battery unit, the first duty ratio signal, the output current of the super capacitor unit and the first duty ratio signal, without obtaining the load current and the output current of the solar power generation unit. Preferably, the management unit adds a low-pass filter with a cutoff frequency ω to eliminate high-frequency noise interference caused by a left-side differential term in the state equation when obtaining the estimated value. Preferably, the management unit can determine the working mode of the power supply device based on the estimated value to generate the corresponding first duty ratio signal and the second duty ratio signal, so as to complete energy management of the hybrid energy storage power supply device, achieve power balance, and ensure stable bus voltage.
Preferably, the management unit is configured to: and constructing a generation model of the duty ratio signal, and generating a first duty ratio signal for controlling the working state of the first converter and a second duty ratio signal for controlling the working state of the second converter according to the estimated value, the electrical parameter and the working mode of the power supply device. The working modes of the power supply device at least comprise a first mode that the generated power of the solar power generation unit is larger than the electric power of the load, a second mode that the generated power of the solar power generation unit is equal to the electric power of the load, and a third mode that the generated power of the solar power generation unit is smaller than the electric power of the load.
The invention further provides a power supply management method of the hybrid energy storage power supply device. The method at least comprises the following steps:
the solar power generation unit, the storage battery unit, the super capacitor unit and the output port are respectively connected through a power transmission bus to build a power transmission circuit;
collecting various parameters in the circuit through a management unit;
the storage battery unit and the super capacitor unit are used for storing electric energy generated by the solar power generation unit and supplying power to the output port based on the control of the management unit;
and the storage battery unit and the super capacitor unit respond to the control of the management unit and supply power to the output port in at least two changing modes of current under the condition that the power generation power of the solar power generation unit and/or the power utilization power of the load changes.
According to a preferred embodiment, the method further comprises:
the storage battery unit and the super capacitor unit are connected to the management unit through configured converters;
the management unit controls the working mode of the storage battery unit and/or the super capacitor unit in a mode of transmitting a duty ratio signal to the converter.
Drawings
FIG. 1 is a simplified schematic diagram of a preferred embodiment of a power supply provided by the present invention;
fig. 2 is a simplified schematic diagram of a management unit according to a preferred embodiment of the present invention.
List of reference numerals
100: a power supply device; 101: a power transmission bus; 102: a bus capacitor; 103: an output port; 110: a solar power generation unit; 120: a battery cell; 121: a battery pack; 122: a first converter; 130: a super capacitor unit; 131: a super capacitor; 132: a second converter; 140: a management unit; 141: a sampling module; 142: a verification module; 143: a first calculation module; 144: a filtering module; 145: a second calculation module; 146: and an adjusting module.
Detailed Description
This is explained in detail below with reference to fig. 1 and 2.
According to the invention, the management unit is used for controlling the working states of the solar power generation unit, the storage battery pack and the super capacitor, and the energy management performance of the satellite power grid is improved through a trigger type energy management strategy. The hybrid energy storage power supply device and the power supply management method thereof eliminate unnecessary operation and control action in energy management in the prior art, thereby eliminating current fluctuation of a hybrid energy storage system, namely a storage battery pack and a super capacitor, under a satellite power grid multi-mode.
Example 1
The invention provides a hybrid energy storage power supply device 100, which at least comprises a solar power generation unit 110, a storage battery unit 120, a super capacitor unit 130 and a management unit 140. The management unit 140 is configured to: in the case where there is a change in the generated power of the solar power generation unit 110 or the power consumption of the load, at least the circuit parameters of the power supply device 100 are acquired, and the operation mode of the power supply device is controlled based on the respective parameters. The respective parameters include at least a voltage value and a current value of the battery cell 120 and/or the supercapacitor cell 130.
Preferably, the present invention adjusts the power supply state of the storage battery unit 120 and/or the super capacitor unit 130 by acquiring corresponding parameters of the power supply device 100 in combination with the trigger control and the predictive control, so that the power supply device 100 can realize fast dynamic response to various changes of the solar power generation unit 110 and the load in the power grid, realize power balance, and ensure stable bus voltage.
Referring to fig. 1, preferably, the solar power generation unit 110, the storage battery unit 120, the supercapacitor unit 130, the management unit 140, and the output port 103 are respectively connected to the power transmission bus 101. The battery unit 120 is composed of a battery pack 121 and a first inverter 122. The supercapacitor unit 130 is composed of a supercapacitor 131 and a second converter 132. The management unit 140 is connected to the solar power generation unit 110, the first inverter 122, the second inverter 132, and the output port 103, respectively, in addition to the power transmission bus 101. The power transmission bus 101 is provided with a bus capacitor 102. The hybrid energy storage power supply device 100 at least comprises a solar power generation unit 110, a storage battery unit 120, a super capacitor unit 130, a management unit 140 and an output port 103. The storage battery unit 120 and the supercapacitor unit 130 store electric energy generated by the solar power generation unit 110 and supply power to the output port 103 based on the control of the management unit 140. Battery cell 120 and supercapacitor cell 130 are configured to: in the case where there is a change in the generated power of the solar power generation unit 110 and/or the used power of the load, the output port 103 is supplied with power in at least two ways of change in current in response to the control of the management unit 140. The battery unit 120 and the supercapacitor unit 130 are connected to the management unit 140 through the configured inverter. The management unit 140 is configured to: the operation of the battery unit 120 and/or the supercapacitor unit 130 is controlled by transmitting a duty signal to the inverter. Preferably, the at least two ways of changing the current may refer to a change in magnitude of the current value and a change in direction of the current.
Preferably, the present invention adjusts the power supply states (working modes) of the storage battery unit 120 and the super capacitor unit 130 by acquiring parameters of the power supply apparatus 100 in combination with the trigger control and the prediction control, so that the power supply apparatus 100 can achieve a fast dynamic response to various changes of the solar power generation unit 110 and the load in the power grid, achieve power balance, and ensure that the bus voltage is stable.
Preferably, the accumulator unit 120 is connected to the transmission bus 101 to receive the electric power generated by the solar power generation unit 110 and/or to supply the output port 103 with electric power. The battery unit 120 includes a battery pack 121 and a first inverter 122. The first inverter 122 is configured to: the charge and discharge state of the battery cell 120 is controlled by causing the secondary battery pack 121 to generate at least two changes in current in response to the duty signal transmitted from the management unit 140.
Preferably, the supercapacitor unit 130 is connected to the transmission bus 101 to receive the electric power generated by the solar power generation unit 110 and/or supply the output port 103 with the electric power. The supercapacitor unit 130 includes a supercapacitor 131 and a second converter 132. The second inverter 132 is configured to: the charging and discharging states of the super capacitor unit 130 are controlled by generating at least two changes of current in the super capacitor 131 in response to the duty ratio signal transmitted from the management unit 140.
Preferably, the first inverter 122 and the second inverter 132 are both half-bridge inverters. Preferably, the first inverter 122 and the second inverter 132 employ half-bridge inverters of the same specification. Preferably, the half-bridge converter may be composed of one inductor and two switching diodes. Under the condition that the illumination intensity and/or the load power are/is changed, in response to the control of the management unit 140, the first converter 122 and the second converter 132 respectively control the power supply states of the storage battery unit 120 and the super capacitor unit 130, so that power balance is realized, and the bus voltage is ensured to be stable.
Referring to fig. 2, preferably, the management unit 140 may include: a sampling module 141 and a verification module 142, a calculation module and an adjustment module 146; wherein, the calculation module is divided into a first calculation module 143 and a second calculation module 145, and the first calculation module 143 and the second calculation module 145 are connected through a filtering module 144.
Preferably, the management unit 140 includes at least a sampling module 141 and a verification module 142. The sampling module 141 is configured to: each parameter in the power supply apparatus 100 is sampled. Preferably, the parameters collected by the sampling module 141 at least include a voltage value and a current value of the battery pack 121 and/or the super capacitor 131. The verification module 142 is configured to: it is verified whether the variation of the generated power of the solar power generation unit 110 and/or the power consumption of the load exceeds a preset threshold value within a preset period, and data is transmitted to the back end only in case that the verification result is true.
Preferably, the verification module 142 is configured to: and under the condition of finishing verification, sending a verification result to the computing module so as to control the working state of the computing module and the rear-end related modules thereof.
Preferably, the verification condition may be theoretically designed based on the voltage value of the power transmission bus 101 in the power supply device 100, the capacitance value of the bus capacitor 102, the output current and voltage of the storage battery unit 120, the first duty ratio signal, the output current and voltage of the super capacitor unit 130, the second duty ratio signal, and a predicted value of the total current required to be provided by the storage battery unit 120 and the super capacitor unit 130, in combination with an event-triggered control strategy.
Preferably, the management unit 140 further comprises a calculation module and a regulation module 146. The calculation module is configured to: in the case where the verification module 142 is true to the verification result, the parameters collected by the sampling module 141 are received and two sets of duty ratio signals sent to the adjusting module 146 are calculated and generated. The adjustment module 146 is configured to: in response to receipt of the duty cycle signal, the duty cycle signal is inverted by two and transmitted to the first converter 122 or the second converter 132. Preferably, the two sets of duty cycle signals are a first duty cycle signal and a second duty cycle signal, respectively. Preferably, the duty cycle signal sent to the first converter 122 is a first duty cycle signal. Preferably, the duty cycle signal sent to the second converter 132 is a second duty cycle signal.
Preferably, the computing module is further configured to: in the case where the duty cycle signals are sent to the adjustment module 146, the two sets of duty cycle signals are sent to the verification module 142 to update the verification conditions of the verification module 142.
Preferably, the computing modules include at least a first computing module 143 and a second computing module 145. The first calculation module 143 is connected to the second calculation module 145 via the filtering module 144. The first calculation module 143 is configured to: in the case that the verification result is true by the verification module 142, the target value of the total value of the current required to be supplied to the storage battery unit 120 and the super capacitor unit 130 is calculated based on the parameters collected by the sampling module 141. The first calculation module 143 transmits the target value to the filtering module 144 to divide the target value of the total value of the current required to be supplied by the battery unit 120 and the supercapacitor unit 130 into the target value of the battery unit 120 and the target value of the supercapacitor unit 130.
The second calculation module 145 is configured to: upon receiving the battery unit 120 target value and the supercapacitor unit 130 target value through the filtering module 144, two sets of duty ratio signals are computationally generated. The second calculation module 145 transmits the duty ratio signal to the adjustment module 146 and the verification module 142, respectively, to complete the adjustment of the operation mode of the battery unit 120 and/or the supercapacitor unit 130 and the update of the verification condition of the verification module 142.
Preferably, the solar power generation unit 110 is configured to: electric energy is generated based on a maximum power point tracking algorithm so as to realize maximum power output under different illumination intensities. Preferably, the solar power generation unit 110 includes a solar panel, a photovoltaic signal generator and a photovoltaic converter. The photovoltaic signal generator generates a third duty ratio signal for controlling the operating state of the photovoltaic converter by using a maximum power point tracking algorithm, so that the solar power generation unit 110 realizes maximum power output under different illumination intensities.
The management unit 140 is configured to: an estimated value of the total current required to be supplied by the battery pack 121 and the supercapacitor 131 is calculated based on the state model and the electrical parameters. Preferably, the total value of the current required to be provided by the battery pack 121 and the super capacitor 131 is the total value of the current required to be provided by the battery unit 120 and the super capacitor unit 130.
Preferably, the equation of state using the present invention can be expressed as follows:
C*dV 0 (t)/dt=I 1 (t)+I 2 (t)*(1-Q 1 (t))+I 3 *(1-Q 2 (t)])-I 4 (t)；
where t is a time variable, C is a capacitance of the bus capacitor 102, and V 0 Is the voltage of the transmission bus 101, I 1 Is the output current, I, of the solar power unit 110 2 Is the output current, Q, of the battery cell 120 1 Is a first duty cycle signal, I 3 Is the output current, Q, of the super-capacitor 2 Is a second duty cycle signal, I 4 Is the load current.
The total current required to be supplied by the battery cell 120 and the supercapacitor cell 130 is I 5 The expression is as follows:
I 5 =I 4 -I 1 ；
I 5 is estimated as I 6 The expression is as follows:
I 6 =(I 2 *(1-Q 1 )+I 3 *(1-Q 2 )-C*V 0 )*ω/(1+ω)；
preferably, the management unit 140 may obtain a pre-estimated value of the total current value required to be provided by the storage battery unit 120 and the super capacitor unit 130 by using the local information, that is, the capacitance value of the bus capacitor 102, the voltage of the power transmission bus 101, the output current of the storage battery unit 120, the first duty signal, the output current of the super capacitor unit 130, and the first duty signal, without obtaining the load current and the output current of the solar power generation unit 110. Preferably, the management unit 140 adds a low-pass filter with a cut-off frequency ω to remove high-frequency noise interference caused by a left differential term in the state equation when obtaining the estimated value. Preferably, the management unit 140 can determine the operating mode of the power supply device 100 based on the estimated value to generate a corresponding first duty ratio signal and a corresponding second duty ratio signal, so as to complete energy management of the hybrid energy storage power supply device 100, achieve power balance, and ensure stable bus voltage.
Preferably, the management unit 140 is configured to: a model for generating the duty cycle signal is constructed and a first duty cycle signal for controlling the operating state of the first converter 122 and a second duty cycle signal for controlling the operating state of the second converter 132 are generated based on the estimated values, the electrical parameters and the operating mode of the power supply apparatus 100. The operation modes of the power supply device 100 include at least a first mode in which the generated power of the solar power generation unit 110 is larger than the consumed power of the load, a second mode in which the generated power of the solar power generation unit 110 is equal to the consumed power of the load, and a third mode in which the generated power of the solar power generation unit 110 is smaller than the consumed power of the load.
Preferably, in the case of receiving a true value verification result, the first calculation module 143 calculates a target value of the total value of the current required to be supplied by the accumulator unit 120 and the supercapacitor unit 130, on the basis of the target value of the voltage of the transmission bus 101 and the local corresponding parameters. Preferably, the first calculation module 143 divides the target value of the total value of the current required to be supplied by the battery unit 120 and the supercapacitor unit 130 into the target value of the battery unit 120 and the target value of the supercapacitor unit 130 through the filtering module 144. Preferably, in case of receiving a true value verification result, the second calculation module 145 calculates a first duty ratio signal and a second duty ratio signal that result in an optimal duty ratio based on the target value of the battery unit 120 and the target value of the supercapacitor unit 130 and related corresponding parameters. Preferably, after the second calculation module 145 obtains the first duty ratio signal and the second duty ratio signal with the optimal duty ratio, the signals are respectively sent to the adjustment module 146 and the verification module 142. In response to receipt of the signal, the verification module 142 updates the trigger condition to dynamically respond to various changes in the photovoltaic and load within the satellite grid. In response to the signal reception, the adjusting module 146 divides the first duty ratio signal and the second duty ratio signal into two parts and then respectively transmits the two parts to the first converter 122 and the second converter 132, so as to complete the adjustment of the power supply states of the storage battery unit 120 and the super capacitor unit 130, thereby realizing the power balance and ensuring the stable bus voltage.
The present embodiment verifies the change in the satellite television network by the verification module 142. When the verification result is false, the related module at the back end of the verification module 142 is hung up and does not work; only under the condition that the verification result is true, the management unit 140 generates a new first duty ratio signal and a new second duty ratio signal to adjust the power supply states of the storage battery unit 120 and the super capacitor unit 130, so that unnecessary operation and control actions in power management are avoided, and further, the operation resource requirement and the switching loss are reduced.
Example 2
This embodiment is a further improvement of embodiment 1, and repeated contents are not described again.
The present embodiment provides a power supply management method for a hybrid energy storage power supply device 100. The power supply management method at least comprises the following steps: in the case where there is a change in the generated power of the solar power generation unit 110 or the power consumption of the load, the management unit 140 acquires at least the corresponding parameter of the power supply device 100, and controls the operation mode of the power supply device 100 based on the corresponding parameter. The respective parameters include at least a voltage value and a current value of the battery cell 120 and/or the supercapacitor cell 130.
The power supply management method further comprises:
the solar power generation unit 110, the storage battery unit 120, the super capacitor unit 130 and the output port 103 are respectively connected through a power transmission bus 101 to build a power transmission circuit;
collecting various parameters in the circuit through the management unit 140;
the storage battery unit 120 and the super capacitor unit 130 store electric energy generated by the solar power generation unit 110 and supply power to the output port 103 based on the control of the management unit 140;
the storage battery unit 120 and the supercapacitor unit 130 supply power to the output port 103 in at least two varying ways of current in response to the control of the management unit 140 in the case where there is a variation in the generated power of the solar power generation unit 110 and/or the power consumption of the load. Preferably, the power supply variation of the battery cell 120 and the supercapacitor cell 130 may include variation of a current value, a voltage value, a current period, and a current direction.
Preferably, the power supply management method further includes:
the battery unit 120 and the supercapacitor unit 130 are connected to the management unit 140 through configured inverters;
the management unit 140 controls the operation of the battery unit 120 and/or the supercapacitor unit 130 by transmitting a duty signal to the inverter.
The power supply management method of the embodiment further includes:
acquiring corresponding parameters of the power supply device 100;
verifying whether the corresponding parameter satisfies a verification condition for changing the operation mode of the power supply device 100 by the verification module 142;
when the verification result is false, the related module at the back end of the verification module 142 goes on-hook and does not work;
under the condition that the verification result is true, the calculation module generates a new first duty ratio signal and a new second duty ratio signal;
the second calculation module 145 sends the newly generated first duty cycle signal and the second duty cycle signal to the adjustment module 146 and the verification module 142, respectively;
in response to receipt of the signal, the verification module 142 updates the verification conditions for the next verification; the adjusting module 146 divides the first duty ratio signal and the second duty ratio signal into two parts and transmits the two parts to the first converter 122 and the second converter 132 respectively, so as to complete the adjustment of the power supply states of the storage battery unit 120 and the super capacitor unit 130. The power supply management method of the hybrid energy storage power supply device 100 provided by this embodiment can rapidly and dynamically respond to various changes of photovoltaic and load in the satellite power grid, realize power balance, ensure bus voltage stability, and avoid unnecessary operation and control actions, thereby reducing operation resource requirements and switching loss.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not intended to be limiting on the claims. The scope of the invention is defined by the claims and their equivalents. Throughout this document, the features referred to as "preferably" are only optional and should not be understood as necessarily requiring that such applicant reserves the right to disclaim or delete any relevant preferred feature at any time. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims (9)

1. A hybrid energy storage power supply device at least comprises a solar power generation unit (110), a storage battery unit (120), a super capacitor unit (130), a management unit (140) and an output port (103),
it is characterized in that the preparation method is characterized in that,
the storage battery unit (120) and the super capacitor unit (130) store electric energy generated by the solar power generation unit (110) and supply power to the output port (103) based on control of the management unit (140),
the battery cell (120) and the supercapacitor cell (130) are configured to: in the case of a change in the generated power of the solar power generation unit (110) and/or the used power of the load, the output port (103) is supplied with power in at least two changes in current in response to the control of the management unit (140), wherein,
the accumulator unit (120) and the supercapacitor unit (130) are connected to the management unit (140) by configured converters;
the management unit (140) is configured to: controlling the mode of operation of the accumulator unit (120) and/or the supercapacitor unit (130) by transmitting a duty cycle signal to the converter;
wherein the management unit (140) is configured to: constructing a generation model of the duty ratio signal, and generating the duty ratio signal according to the estimated value, the electrical parameter and the working mode of the power supply device;
wherein the management unit (140) calculates an estimated value of the total value of the current required to be supplied by the accumulator unit (120) and the super capacitor unit (130) based on the state model of the power supply device and the electrical parameters;
wherein the state equation of the state model is as follows:
C*dV0(t)/dt=I1(t)+I2(t)*(1-Q1(t))+I3(t)*(1-Q2(t))-I4(t)；
wherein t is a time variable, C is a capacitance value of a bus capacitor (102), V0 is a voltage of a transmission bus (101), I1 is an output current of the solar power generation unit (110), I2 is an output current of the storage battery unit (120), Q1 is a first duty ratio signal, I3 is an output current of the super capacitor unit (130), Q2 is a second duty ratio signal, and I4 is a load current;
the total value of the current required to be provided by the storage battery unit (120) and the super capacitor unit (130) is I5, and the expression is as follows:
I5=I4-I1；
the predicted value of I5 is I6, and the expression is as follows:
i6= (I2 = (1-Q1) + I3: (1-Q2) -C:v0) × [ omega ]/(1 + ω); where ω is the cutoff frequency.
2. The hybrid energy-storing and power-supplying device according to claim 1, characterized in that said accumulator unit (120) is connected to a transmission busbar (101) to receive the electric energy generated by said solar power generation unit (110) and/or to supply said output port (103);
the battery unit (120) comprises a battery pack (121) and a first inverter (122), the first inverter (122) being configured to: in response to the duty ratio signal sent by the management unit (140), the charge-discharge state of the battery unit (120) is controlled in such a manner that the battery pack (121) generates at least two changes in current.
3. The hybrid energy-storing and power-supplying device according to claim 2, characterized in that said supercapacitor unit (130) is connected to a transmission busbar (101) to receive the electric energy generated by said solar power generating unit (110) and/or to supply said output port (103);
the supercapacitor unit (130) comprises a supercapacitor (131) and a second converter (132), the second converter (132) being configured to: and controlling the charging and discharging state of the super capacitor unit (130) by generating at least two changes of current for the super capacitor (131) in response to the duty ratio signal sent by the management unit (140).
4. The hybrid energy-storing power supply apparatus according to claim 3, characterized in that said management unit (140) comprises at least a sampling module (141) and a verification module (142); the sampling module (141) is configured to: sampling various parameters in the power supply device, wherein the parameters at least comprise a voltage value and a current value of the storage battery pack (121) and/or the super capacitor (131);
the verification module (142) is configured to: verifying whether the change of the generated power of the solar power generation unit (110) and/or the power consumption of the load exceeds a preset threshold value within a preset period, and transmitting data to a back end only if the verification result is true.
5. Hybrid energy-storing power supply unit according to claim 4, characterized in that said management unit (140) further comprises a calculation module and a regulation module (146);
the calculation module is configured to: under the condition that the verification module (142) is true to the verification result, receiving the parameters collected by the sampling module (141), and calculating to generate two groups of duty ratio signals sent to the adjusting module (146);
the adjustment module (146) is configured to: in response to receipt of the duty cycle signal, inverting and halving the duty cycle signal and transmitting to the first converter (122) or the second converter (132).
6. The hybrid energy-storing power supply apparatus according to claim 5, wherein said computing module is further configured to: in the case where the duty cycle signals are sent to the adjustment module (146), two sets of duty cycle signals are sent to the verification module (142) to update the verification conditions of the verification module (142).
7. Hybrid energy-storing power supply device according to claim 6, characterized in that said calculation module comprises at least a first calculation module (143) and a second calculation module (145), wherein said first calculation module (143) is connected to the second calculation module (145) via a filtering module (144);
the first computing module (143) is configured to: under the condition that the verification module (142) is true to the verification result, calculating a target value of the total value of the current required to be supplied by the storage battery unit (120) and the super capacitor unit (130) based on the parameters collected by the sampling module (141), and transmitting the target value to the filtering module (144) so as to divide the target value of the total value of the current required to be supplied by the storage battery unit (120) and the super capacitor unit (130) into the target value of the storage battery unit (120) and the target value of the super capacitor unit (130);
the second computing module (145) is configured to: under the condition that the target value of the storage battery unit (120) and the target value of the super capacitor unit (130) are received through the filtering module (144), two groups of duty ratio signals are calculated and generated, and are respectively transmitted to the adjusting module (146) and the verifying module (142), so that the adjustment of the working mode of the storage battery unit (120) and/or the super capacitor unit (130) and the updating of the verifying condition of the verifying module (142) are completed.
8. The hybrid energy-storing power supply apparatus according to claim 7, characterized in that the solar power generation unit (110) is configured to: electric energy is generated based on a maximum power point tracking algorithm so as to realize maximum power output under different illumination intensities.
9. A method for managing the power supply of a hybrid energy-storing power supply unit, characterized in that it comprises at least:
the solar power generation unit (110), the storage battery unit (120), the super capacitor unit (130) and the output port (103) are respectively connected through a power transmission bus (101) to build a power transmission circuit;
collecting, by a management unit (140), parameters in the circuit;
storing the electric energy generated by the solar power generation unit (110) with the storage battery unit (120) and the super capacitor unit (130) and supplying power to the output port (103) based on the control of the management unit (140);
the storage battery unit (120) and the super capacitor unit (130) supply power to the output port (103) in at least two changing ways of current in response to the control of the management unit (140) under the condition that the power generation power of the solar power generation unit (110) and/or the power utilization power of the load changes;
the accumulator unit (120) and the supercapacitor unit (130) are connected to the management unit (140) by configured converters;
the management unit (140) controls the working mode of the storage battery unit (120) and/or the super capacitor unit (130) by transmitting a duty ratio signal to the converter;
wherein the management unit (140) is configured to: constructing a generation model of the duty ratio signal, and generating the duty ratio signal according to the estimated value, the electrical parameter and the working mode of the power supply device;
wherein the management unit (140) calculates an estimated value of the total value of the current required to be supplied by the accumulator unit (120) and the super capacitor unit (130) based on the state model of the power supply device and the electrical parameters;
wherein the state equation of the state model is as follows:
C*dV0(t)/dt=I1(t)+I2(t)*(1-Q1(t))+I3(t)*(1-Q2(t))-I4(t)；
wherein t is a time variable, C is a capacitance value of a bus capacitor (102), V0 is a voltage of a transmission bus (101), I1 is an output current of the solar power generation unit (110), I2 is an output current of the storage battery unit (120), Q1 is a first duty ratio signal, I3 is an output current of the super capacitor unit (130), Q2 is a second duty ratio signal, and I4 is a load current;
the total value of the current required to be provided by the accumulator unit (120) and the super capacitor unit (130) is I5, and the expression thereof is as follows:
I5=I4-I1；
the predicted value of I5 is I6, and the expression is as follows:
i6= (I2 × (1-Q1) + I3 × (1-Q2) -C × V0) × (1 + ω); where ω is the cut-off frequency.
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