CN113904453A - Backup energy storage parallel operation system and control method thereof - Google Patents
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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
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
Abstract
The invention discloses a backup energy storage parallel operation system and a control method thereof, wherein the parallel operation system comprises two backup energy storage systems; each backup energy storage system comprises an energy storage module, a DC/DC module, a DC/AC module, an AC interface and an MCU module which are sequentially connected, wherein the MCU module is respectively connected with the energy storage module, the DC/DC module, the DC/AC module and the AC interface; the output ends of the DC/DC modules of the two backup energy storage systems are connected, and the alternating current parallel output is converted into direct current parallel output; the output end of the AC interface module of one backup energy storage system is connected with a load; the DC/DC module is used for detecting output, input current, output and voltage and transmitting the output and input current, the output and voltage and the voltage to the MCU module; the MCU module is used for controlling the output power of the parallel operation system according to the received data. The method adopts an overcurrent step-down method, an output voltage disturbance method or a slave computer communication current sharing method, and increases the alternating current output power of the parallel operation system in a simpler connection mode.
Description
Technical Field
The invention relates to a backup energy storage parallel operation system and a control method thereof, which control the output power of the system by designing the connection mode of a backup energy storage system and belong to the technical field of energy storage.
Background
The backup energy storage system, also called as a portable power supply system or a portable energy storage system, is a modern hot device, is deeply popular with people at home and abroad, and is often used in scenes such as tourism, emergency and the like.
As shown in fig. 1, the backup energy storage system generally includes a DC interface, an AC interface, a DC/DC module, a DC/AC module, an MCU module, an energy storage module, and other modules. The DC interface refers to a mode (such as a DC socket, a USB interface, a cigarette lighter, etc.) for accessing a DC device or a DC source; the AC interface module refers to a mode (such as a two-pin socket, a triangular socket, etc.) for accessing an AC device or an AC source; the DC/DC module is a topological structure for converting direct current into direct current (such as BUCK, BOOST, LLC, forward excitation, flyback and the like); the energy storage module can be a battery or other energy storage equipment; the DC/AC module is a direct current-to-alternating current or alternating current-to-direct current module (full-wave rectification, half-wave rectification, push-pull, PFC and the like); the MCU module is used for controlling and calculating; the other modules include the rest modules such as display, sound and keys.
Generally speaking, in a backup energy storage system, the energy storage module needs to pass through the architecture as shown in fig. 3 from the energy storage module to the AC output interface, the energy storage module can raise the voltage to the voltage that can be used by the input terminal of the DC/AC module through the DC/DC module, and then the DC power is converted into the AC power through the DC/AC module and is output from the AC interface module. The energy which can be released in the backup energy storage system is completely determined by the energy stored in the battery, and the output power of the system is not only limited by the energy storage module, but also limited by the type selection of the device.
If the output power of the backup energy storage system is required to be enlarged, the two systems are connected in parallel to output the output power, the direct current ends of the two systems are connected in parallel more easily, and the output parallel connection of the alternating current ends is difficult to realize. As shown in fig. 2, ac output ends of two backup energy storage systems are connected together to control ac output currents at two sides, so that the currents are completely equal, and thus three elements of the output ac currents of the two backup energy storage systems need to be controlled to be equal, including amplitude, frequency and phase.
Therefore, a new method for parallel operation of the backup energy storage system is urgently needed to be developed and designed.
Disclosure of Invention
In order to solve the existing technical problems, the invention provides a backup energy storage parallel operation system and a control method, so that after two backup energy storage systems are connected in parallel in a new mode, higher power output can be realized.
In order to achieve the purpose, the invention provides a backup energy storage parallel operation system, which comprises two backup energy storage systems; each backup energy storage system comprises an energy storage module, a DC/DC module, a DC/AC module, an AC interface and an MCU module which are sequentially connected, wherein the MCU module is respectively connected with the energy storage module, the DC/DC module, the DC/AC module and the AC interface;
the output ends of the DC/DC modules of the two backup energy storage systems are connected, and the alternating current parallel output is converted into direct current parallel output; the output end of the AC interface module of one backup energy storage system is connected with a load;
the DC/DC module is used for detecting output, input current, output and voltage and transmitting the output, input current, output voltage and voltage to the MCU module; and the MCU module is used for controlling the output power of the parallel operation system according to the received data.
Furthermore, the MCU modules of the two backup energy storage systems are connected by a communication line.
The invention also provides a control method of the backup energy storage parallel operation system, which adopts an overcurrent step-down method and an overcurrent step-down method to realize a non-uniform current control mode, sets the DC/DC modules of the two backup energy storage systems to be in a constant voltage and limited current mode, and reduces the output voltage of the DC/DC modules when the output current of the DC/DC modules exceeds a rated current value.
Further, the control method comprises the following specific steps:
a1, setting the DC/DC module to be a constant voltage and current limiting mode and setting the rated current value of the DC/DC module by the two backup energy storage systems respectively;
a2, respectively operating the DC/DC modules of the two backup energy storage systems in a constant voltage mode, detecting the magnitude of output current, and sending the output current to the corresponding MCU modules;
a3, judging whether the corresponding output current exceeds the rated current value by the MCU module of the two backup energy storage systems respectively;
a4, if yes, the MCU module reduces the output voltage of the corresponding DC/DC module;
the invention also provides a control method of the backup energy storage parallel operation system, which adopts an output voltage disturbance method to realize a non-communication current sharing control mode, detects the output current of the DC/DC modules of the two backup energy storage systems, calculates the output voltage disturbance quantity delta U, and uses the reference voltage value U to realize the non-communication current sharing control moderefThe result of au is the input voltage of the switching power supply control loop, which brings the output currents of the DC/DC modules of the two backup energy storage systems close.
Further, the control method comprises the following specific steps:
b1, setting reference voltage value U of DC/DC module by two backup energy storage systems respectivelyrefAnd the output voltage disturbance quantity delta U is k I, wherein k is a disturbance coefficient, and I is output current;
b2, the two backup energy storage systems respectively detect the magnitude of the output current of the DC/DC module and send the magnitude to the corresponding MCU module;
b3, respectively calculating an output voltage disturbance quantity delta U by the MCU modules of the two backup energy storage systems;
b4, and U is respectively calculated by MCU modules of two backup energy storage systemsrefAu and the result is taken as the input voltage of the switching power supply control loop, and then returns to B2.
The invention further provides a control method of the backup energy storage parallel operation system, which is characterized in that a communication current-sharing control mode is realized by adopting a slave communication current-sharing method in a communication current-sharing control mode, one backup energy storage system is set to operate normally as a master, the other backup energy storage system is used as a slave to receive the output current of the DC/DC module transmitted by the master, and the output voltage of the backup energy storage system is controlled according to the received output current, so that the output current of the DC/DC module of the master and the slave approaches.
Further, the control method comprises the following specific steps:
c1, setting one of the backup energy storage systems as a main machine and enabling the main machine to normally operate; setting another backup energy storage system as a slave;
c2, the host detects the output current of the DC/DC module and sends the output current to the slave, and the MCU module of the slave receives the output current signal;
c3, detecting the magnitude of the output current of the DC/DC module from the slave;
c4, judging whether the output current of the host is larger than that of the slave by the MCU module of the slave;
c5, if yes, the MCU module of the slave increases the output voltage of the slave and returns to C2;
if not, the output voltage of the slave is reduced by the MCU module of the slave, and the process returns to C2.
In summary, the two backup energy storage systems are used in parallel, and the output power of the parallel operation system can be enlarged, compared with the prior art, the parallel operation system has the following technical advantages:
1. when the two backup energy storage systems are connected in parallel, the output ends of the DC/DC modules of the two backup energy storage systems are connected in parallel without being directly connected through the alternating current ends, so that the alternating current parallel output is converted into the direct current parallel output.
2. The invention increases the alternating current output power of the backup energy storage system in a simpler connection mode.
3. The method for increasing the output power of the parallel operation system is various, and not only is the control simple, but also the realization is easy.
Drawings
FIG. 1 is an electrical schematic block diagram of a prior art backup energy storage system;
FIG. 2 is an electrical schematic diagram of two backup energy storage systems having AC outputs coupled together according to the prior art;
FIG. 3 is a diagram of a prior art AC output framework;
FIG. 4 is an electrical schematic block diagram of a backup energy storage system parallel operation of the present invention;
FIG. 5a is a circuit diagram of an embodiment of the present invention in which the DC/DC module is in FSBB topology;
FIG. 5b is a schematic diagram of a voltage sense amplifier circuit according to an embodiment of the present invention;
FIG. 5c is a schematic circuit diagram of the MCU module collecting the voltage control switches according to an embodiment of the present invention;
FIG. 5d is a schematic diagram of a current sense amplifier circuit according to an embodiment of the present invention;
FIG. 6 is an electrical schematic diagram of a backup energy storage system of the present invention connected to a load after being connected in parallel;
FIG. 7a is a flowchart of a method for limiting power using a DC/DC module according to embodiment A of the present invention;
FIG. 7b is a waveform diagram of the parallel output of two DC/DC modules when the load is 10 ohms according to embodiment A of the present invention;
FIG. 7c is a waveform diagram of the parallel output of two DC/DC modules when the load is 1 ohm in the embodiment A of the present invention;
FIG. 8a is a flowchart of a method of applying output voltage perturbation according to embodiment B of the present invention;
FIG. 8B is a waveform diagram of the parallel output of two DC/DC modules in the embodiment B of the present invention;
FIG. 9 is an electrical schematic diagram of the backup energy storage system of the present invention connected to a load and a communication line after being connected in parallel;
FIG. 10a is a flowchart of a method for performing current sharing control according to embodiment C of the present invention;
FIG. 10b is a waveform diagram of the parallel output of the two DC/DC modules in the embodiment C 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Firstly, as shown in fig. 4, the present invention includes two backup energy storage systems, each system includes an energy storage module, a DC/DC module, a DC/AC module, an AC interface, and an MCU module, which are connected in sequence; and the MCU module is respectively connected with the energy storage module, the DC/DC module, the DC/AC module and the AC interface. The output ends of the DC/DC modules of the two systems are connected in parallel, and the alternating current parallel output is converted into direct current parallel output. The energy storage module, the DC/DC module and the DC/AC module internally comprise a detection unit, and the MCU module internally comprises a control and calculation unit.
As shown in fig. 5a to 5d, in an embodiment of the present invention, the DC/DC module is an FSBB (source Switch Buck-Boost) topology, output terminals of the DC/DC modules of the two backup energy storage systems are connected in parallel, and output, input current, output and voltage of the DC/DC module are detected and transmitted to the MCU module for feedback control. The MCU module is used for controlling the output power of the parallel operation system according to the received data.
As shown in fig. 5a, the specific circuit of the DC/DC module in the backup energy storage system is: the output positive electrode of the energy storage module is connected with one end of a resistor R3, the other end of a resistor R3 is connected with one end of a resistor R5, and the other end of a resistor R5 is connected with the output negative electrode of the energy storage module; the common end of the resistors R3 and R5 is connected with an input voltage detection point; the output positive pole of the energy storage module is connected with one end of a current sampling resistor R1, the other end of the current sampling resistor R1 is connected with the output negative pole of the energy storage module through a capacitor C1, one end of a current sampling resistor R1 is connected with an input current detection point +, and the other end of the current sampling resistor R1 is connected with an input current detection point-; the other end of the current sampling resistor R1 is connected with the output cathode of the energy storage module through switches K0 and K1. The input anode of the DC/AC module is connected with one end of a resistor R2, the other end of a resistor R2 is connected with one end of a resistor R4, and the other end of a resistor R4 is connected with the input cathode of the DC/AC module; the common end of the resistors R2 and R4 is connected with an output voltage detection point; the input positive pole of the DC/AC module is connected with one end of a current sampling resistor R6, the other end of the current sampling resistor R6 is connected with the input negative pole of the DC/AC module through a capacitor C2, one end of a current sampling resistor R1 is connected with an output current detection point, and the other end of the current sampling resistor R1 is connected with an output current detection point +; the other end of the current sampling resistor R6 is connected with the input cathode of the DC/AC module and the output cathode of the energy storage module through switches K3 and K2; and the common terminal of the switches K0, K1 is connected to the common terminal of the switches K3, K2 via an inductor L1.
The specific circuit of the DC/DC module in the second backup energy storage system is the same as that described above. When the output ends of the DC/DC modules of the first backup energy storage system and the second backup energy storage system are connected in parallel, one end of a resistor R2 of the first backup energy storage system is connected with one end of a resistor R2 'of the second backup energy storage system, and one end of a resistor R4 of the second backup energy storage system is connected with one end of a resistor R4' of the second backup energy storage system.
As shown in fig. 5b, the input voltage detection point is connected to the non-inverting input terminal of the operational amplifier U, and the inverting input terminal thereof is connected to the output terminal, so as to obtain the input voltage, and the output terminal of the operational amplifier U is connected to the input voltage pin of the MCU module. The output voltage detection point is connected with the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U is connected with the output end, so that the output voltage is obtained, and the output end of the operational amplifier U is connected with the output voltage pin of the MCU module.
As shown in FIG. 5c, the PWM0-3 pins of the MCU module are respectively connected to the PWM0-3 pins of the PWM driving module, and the K0-K3 pins of the PWM driving module respectively control the switches K0-K3 of the DC/DC module. Therefore, the MCU module can control the switches of the switches K0-K3 according to the output and input current of the DC/DC module and the output and input voltage, thereby controlling the output power of the parallel operation system.
As shown IN FIG. 5d, the input current detection points +, -are connected to the IN +, IN-pins of the circuit detection amplifier INA181A1IDBVR, respectively, and receive the input current from the OUT pin. The output current detection point +, -is respectively connected with the IN + and IN-pins of the other circuit detection amplifier INA181A1IDBVR, and obtains the output current from the OUT pin. The input current and the output current are connected to the MCU module.
Secondly, the method for expanding the output power of one backup energy storage system has the following modes:
example a, non-uniform flow control:
as shown in fig. 6, the output terminals of the DC/DC modules of the first and second backup energy storage systems are connected together, and the load is connected to the AC interface output terminal of the backup energy storage system. And then the output power of each DC/DC module is limited so as to achieve the purpose of increasing the overall output power of the parallel operation system.
As shown in fig. 7a, an overcurrent step-down method is adopted, and the output mode of the DC/DC module is determined to be a limited voltage mode or a limited current mode by detecting the magnitude of the output current of the DC/DC module of the two backup energy storage systems, and the specific steps are as follows:
a1, setting the DC/DC module to be a constant voltage and current limiting mode and setting the rated current value of the DC/DC module by the two backup energy storage systems respectively;
a2, respectively operating the DC/DC modules of the two backup energy storage systems in a constant voltage mode, detecting the magnitude of output current, and sending the output current to the corresponding MCU modules;
a3, judging whether the corresponding output current exceeds the rated current value by the MCU module of the two backup energy storage systems respectively;
a4, if yes, the MCU module reduces the output voltage of the corresponding DC/DC module; if not, return to A2.
Therefore, when the output current of the DC/DC module is small, the output voltage is a constant value, and the output power is smaller than the limited power; when the output current of the DC/DC module increases but does not reach the limit value, the output voltage is constant, the output power increases along with the increase of the output current, but the output power does not reach the limit value; when the output current of the DC/DC module is increased to a certain value, the output voltage of the DC/DC module is reduced under the control of the MCU module, so that the purpose of overcurrent and voltage reduction is achieved.
In the implementation, the output voltage of the DC/DC module is set to 20V, the limiting current is set to 10A (although the output voltage is set to 20V, the output power is different because the line resistance is different and the power source equivalent resistance is different, and the actually measured voltage is not necessarily 20V, the equivalent internal resistance of the backup energy storage system is 0.1 ohm, and the equivalent internal resistance of the backup energy storage system is 0.2 ohm. When the load is 10 ohms, the waveform of the parallel output of the two DC/DC modules is shown in fig. 7b, and it can be seen from the figure that: the output currents of the two systems differ considerably. When the load is 1 ohm, the waveforms output by the two DC/DC modules in parallel are shown in fig. 7c, and it can be seen from the figure that: the current of the system is limited to 10A, the output voltage of the DC/DC module drops a little, and the current of the system II gradually increases.
In addition, because the backup energy storage system runs in a one-to-two parallel mode, which system has a high output voltage value and which system has a large output current value, and a current sharing mode does not exist. The common cases are: when more than one load of the backup energy storage system is connected, the power of one system is full load, and the power of the other system is light load. The method does not perform current sharing control on each backup energy storage system and does not need to connect communication lines.
Embodiment B, non-communication current sharing control method:
the connection method of this embodiment is the same as embodiment a. As shown in fig. 6, the DC/DC output terminals of the backup energy storage system are connected together, the load is connected to the output terminal of the AC interface module of the backup energy storage system, and the purpose of increasing the output power is achieved by limiting the output power of each DC/DC module.
As shown in fig. 8a, the output current phase of the two backup energy storage systems is made to approach by using an output voltage perturbation method, which specifically includes the following steps:
b1, setting reference voltage value U of DC/DC module by two backup energy storage systems respectivelyrefAnd the output voltage disturbance quantity delta U is k I, wherein k is a disturbance coefficient, and I is output current;
b2, the two backup energy storage systems respectively detect the magnitude of the output current of the DC/DC module and send the magnitude to the corresponding MCU module;
b3, respectively calculating an output voltage disturbance quantity delta U by the MCU modules of the two backup energy storage systems;
b4, and U is respectively calculated by MCU modules of two backup energy storage systemsref-AU and using the result as an input voltage to a control loop of the switching power supply,and then returns to B2.
In implementation, the output voltage of the DC/DC module is set to 20V, the disturbance coefficient k of the output current is set to 0.1, the load is 1 ohm, and the output condition after the two systems are connected in parallel is as shown in fig. 8b, the output currents of the two systems are relatively close to each other but not completely equal to each other, and the larger k is set, the closer the output currents of the two systems are, but the output voltage of the DC/DC module is reduced more.
According to the method, the output voltage of a system with large output current is reduced more and the output voltage of a system with small output current is reduced less according to the characteristics that the higher the output voltage of two DC/DC modules is, the larger the load is, so that the purpose of current sharing is achieved. And the method is an open-loop method, and two backup energy storage systems are not required to be communicated with each other.
Embodiment C, communication current sharing control method:
as shown in fig. 9, the parallel operation system of this embodiment is different from embodiment a in that two MCU modules are connected via a communication line. The communication mode is generally RS232 or RS485, etc.
As shown in fig. 10a, the output currents of two backup energy storage systems are close to each other by a communication current sharing method of a slave machine in a communication current sharing control manner, and the control method adopts a backup energy storage system operation voltage ring and a backup energy storage system operation current ring. The system is equivalent to a backup energy storage system which is used as a main machine to normally operate, and the other backup energy storage system receives current information transmitted by the main machine and takes the parallel current value as an input value of a control loop. The method comprises the following specific steps:
c1, setting one of the backup energy storage systems as a main machine and enabling the main machine to normally operate; setting another backup energy storage system as a slave;
c2, the host detects the output current of the DC/DC module and sends the output current to the slave, and the MCU module of the slave receives the output current signal;
c3, detecting the magnitude of the output current of the DC/DC module from the slave;
c4, judging whether the output current of the host is larger than that of the slave by the MCU module of the slave;
c5, if yes, the MCU module of the slave increases the output voltage of the slave and returns to C2;
if not, the output voltage of the slave is reduced by the MCU module of the slave, and the process returns to C2.
In the implementation process, the output voltage of the two backup energy storage systems is set to be 20V, and the load is 1 ohm. When communication is carried out, the current output conditions of the two backup energy storage systems are shown in fig. 10b, and the current sharing effect of the two systems is good.
Therefore, the operation flow of the slave machine is as follows: and receiving a current signal sent by the host, and adjusting the output voltage of the host according to the current signal sent by the host so as to control the output current of the master and the slave to be equalized. The current sharing capability of the mode is strong, and the output voltage cannot be pulled down. And because the method is an open-loop control mode, the output current equalizing effect is completely determined by the initial voltage and the disturbance coefficient of the DC/DC output end and is greatly influenced by the load.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A backup energy storage parallel operation system is characterized by comprising two backup energy storage systems; each backup energy storage system comprises an energy storage module, a DC/DC module, a DC/AC module, an AC interface and an MCU module which are sequentially connected, wherein the MCU module is respectively connected with the energy storage module, the DC/DC module, the DC/AC module and the AC interface;
the output ends of the DC/DC modules of the two backup energy storage systems are connected, and the alternating current parallel output is converted into direct current parallel output; the output end of the AC interface module of one backup energy storage system is connected with a load;
the DC/DC module is used for detecting output, input current, output and voltage and transmitting the output, input current, output voltage and voltage to the MCU module;
and the MCU module is used for controlling the output power of the parallel operation system according to the received data.
2. The system according to claim 1, wherein the MCU modules of the two backup energy storage systems are connected by a communication line.
3. The control method of the backup energy storage parallel operation system as claimed in claim 1, wherein an overcurrent step-down method is adopted to realize a non-uniform current control mode, the DC/DC modules of the two backup energy storage systems are set to be in a constant voltage and limited current mode, and when the output current of the DC/DC modules exceeds a rated current value, the output voltage of the DC/DC modules is reduced.
4. The control method of the backup energy storage parallel operation system according to claim 3, characterized by comprising the following specific steps:
a1, setting the DC/DC module to be a constant voltage and current limiting mode and setting the rated current value of the DC/DC module by the two backup energy storage systems respectively;
a2, respectively operating the DC/DC modules of the two backup energy storage systems in a constant voltage mode, detecting the magnitude of output current, and sending the output current to the corresponding MCU modules;
a3, judging whether the corresponding output current exceeds the rated current value by the MCU module of the two backup energy storage systems respectively;
a4, if yes, the MCU module reduces the output voltage of the corresponding DC/DC module; if not, return to A2.
5. A process as claimed in claim 1The control method of the backup energy storage parallel operation system is characterized in that an output voltage disturbance method is adopted to realize a non-communication current sharing control mode, the magnitude of output currents of DC/DC modules of two backup energy storage systems is detected, the output voltage disturbance quantity delta U is calculated, and a reference voltage value U is usedrefThe result of au is the input voltage of the switching power supply control loop, which brings the output currents of the DC/DC modules of the two backup energy storage systems close.
6. The control method of the backup energy storage parallel operation system according to claim 5, characterized by comprising the following specific steps:
b1, setting reference voltage value U of DC/DC module by two backup energy storage systems respectivelyrefAnd the output voltage disturbance quantity delta U is k I, wherein k is a disturbance coefficient, and I is output current;
b2, the two backup energy storage systems respectively detect the magnitude of the output current of the DC/DC module and send the magnitude to the corresponding MCU module;
b3, respectively calculating an output voltage disturbance quantity delta U by the MCU modules of the two backup energy storage systems;
b4, and U is respectively calculated by MCU modules of two backup energy storage systemsrefAu and the result is taken as the input voltage of the switching power supply control loop, and then returns to B2.
7. The control method of the backup energy storage parallel operation system according to claim 1 or 2, characterized in that a slave communication current-sharing control method is adopted to realize a communication current-sharing control mode, one backup energy storage system is set to operate normally as a master, the other backup energy storage system is used as a slave to receive the output current of the DC/DC module transmitted by the master, and the output voltage of the backup energy storage system is controlled according to the received output current, so that the output currents of the DC/DC modules of the master and the slave are close to each other.
8. The control method of the backup energy storage parallel operation system according to claim 7, characterized by comprising the following specific steps:
c1, setting one of the backup energy storage systems as a main machine and enabling the main machine to normally operate; setting another backup energy storage system as a slave;
c2, the host detects the output current of the DC/DC module and sends the output current to the slave, and the MCU module of the slave receives the output current signal;
c3, detecting the magnitude of the output current of the DC/DC module from the slave;
c4, judging whether the output current of the host is larger than that of the slave by the MCU module of the slave;
c5, if yes, the MCU module of the slave increases the output voltage of the slave and returns to C2;
if not, the output voltage of the slave is reduced by the MCU module of the slave, and the process returns to C2.
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