CN111555424A - Slave open-loop control method and master-slave parallel system - Google Patents
Slave open-loop control method and master-slave parallel system Download PDFInfo
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- CN111555424A CN111555424A CN202010290841.6A CN202010290841A CN111555424A CN 111555424 A CN111555424 A CN 111555424A CN 202010290841 A CN202010290841 A CN 202010290841A CN 111555424 A CN111555424 A CN 111555424A
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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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention is suitable for the technical field of power supply control, and provides an open-loop control method of a slave machine and a master-slave machine parallel system, wherein the method comprises the following steps: the first slave machine sends the absolute attribute value of the local machine to the controller, the controller calculates the absolute attribute value of the local machine and the absolute attribute value of the host machine to obtain a relative attribute value, and the relative attribute value is converted to obtain the slave machine trimming amount corresponding to the local machine; the first slave inputs the fine adjustment quantity of the receiving slave and the reference control quantity sent by the receiving host into an open loop control loop corresponding to the first slave and then outputs the control quantity of the slave, so that the adjusted control quantity of the first slave is the same as the control quantity of the host, and the hardware current sharing or power sharing is realized. All the first slave machines controlled through the open loop carry out adjustment and calibration respectively, so that the adjustment mode is more flexible and easier to control, and the calibration working efficiency can be improved.
Description
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to an open-loop control method of a slave machine and a master-slave machine parallel system.
Background
When a circuit for expanding power of a high-power converter is sampled, the current sharing effect of all modules corresponding to closed-loop control is realized by adopting a closed-loop sampling control method. Pulse Width Modulation (PWM) of multiple closed-loop circuits is respectively sampled by Analog-to-Digital converters (ADCs), an ADC sampling module collects current of one closed-loop circuit, and then respective closed-loop regulation is performed according to the collected current, so that currents of all hardware are the same. However, when the prior art is adopted for sampling adjustment, because closed-loop control is adopted, the current sharing of all closed-loop circuits cannot be quickly achieved, and the adjustment working efficiency is low.
Disclosure of Invention
In view of this, embodiments of the present invention provide an open-loop control method for a slave machine and a master-slave machine parallel system, which aim to solve the problem in the prior art that, due to the adoption of closed-loop control, current sharing of all modules under closed-loop control cannot be quickly achieved, resulting in low adjustment efficiency.
In order to achieve the above object, a first aspect of an embodiment of the present invention provides an open-loop control method for a slave machine, which is applied to a master-slave parallel system formed by a plurality of power modules and controllers connected in parallel, where any power module is a master machine, and the remaining power modules are slave machines, at least one first slave machine in the slave machines executes the open-loop control method, and the open-loop control method executed by the first slave machine includes:
sending the absolute attribute value of the local machine to the controller, calculating by the controller according to the absolute attribute value of the local machine and the absolute attribute value of the host machine to obtain a relative attribute value, and converting the relative attribute value to obtain a slave trimming amount corresponding to the local machine; the absolute attribute value is used for representing the inherent attribute of the power supply module;
receiving a slave trimming quantity sent by the controller and receiving a reference control quantity sent by the host;
and inputting the reference control quantity and the slave trimming quantity into an open-loop control loop corresponding to the local machine, and then outputting a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
As another embodiment of the present application, the converting the relative attribute value to obtain a slave trimming amount corresponding to the local computer includes:
and converting the relative attribute value into a value with the same attribute or format as the reference control quantity of the host, and taking the value as the slave trimming quantity corresponding to the host.
As another embodiment of the present application, the outputting a slave control quantity after inputting the reference control quantity and the slave trimming quantity into the open loop control loop corresponding to the present application includes:
and after the reference control quantity and the slave fine adjustment quantity are subjected to superposition processing, the reference control quantity and the slave fine adjustment quantity are input into an open loop control loop corresponding to the local machine, and then slave control quantity is output.
As another embodiment of the present application, before a parallel system including a plurality of power modules and a controller connected in parallel, the present application further includes:
and respectively detecting the electrical parameters of all the power supply modules under the same test conditions, converting the electrical parameters into absolute attribute values and storing the absolute attribute values in the corresponding power supply modules.
As another embodiment of the present application, the electrical parameter includes a voltage parameter, a current parameter, or a power parameter.
A second aspect of the embodiments of the present invention provides a master-slave parallel system, including a plurality of power modules and controllers connected in parallel, where any power module is a master and the rest of the power modules are slaves, where at least one first slave in the slaves executes an open-loop control method for any slave, and an absolute attribute value of the slave is pre-stored in each power module, where the absolute attribute value is used to represent an inherent attribute of the power module;
the controller acquires absolute attribute values of all power modules, calculates a relative attribute value of any first slave relative to the host according to the absolute attribute value of any first slave and the absolute attribute value of the host, converts the obtained relative attribute value to obtain a slave trimming value, and sends the slave trimming value to the corresponding first slave;
the master machine outputs a reference control quantity according to the closed-loop control loop, and sends the reference control quantity to any one of the first slave machines, wherein the reference control quantity is used for controlling the master machine;
and any first slave inputs the reference control quantity and the slave fine adjustment quantity of the local machine into an open loop control loop corresponding to the local machine and then outputs a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
As another embodiment of the present application, the power circuits of the power modules are all the same.
As another embodiment of the present application, the first slave includes a CPLD unit or an FPGA unit, and is configured to output a slave control quantity after inputting the reference control quantity and the slave trimming quantity of the first slave into an open-loop control loop corresponding to the first slave.
As another embodiment of the present application, when the number of the slaves is at least two, the open-loop control loops of at least two slaves are the same.
A third aspect of the embodiments of the present invention provides a power supply module, which is applied to any one of the master-slave parallel systems described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: compared with the prior art, the invention sends the absolute attribute value of the local machine to the controller through the first slave machine executing the open-loop control method, so that the controller calculates the relative attribute value according to the absolute attribute value of the local machine and the absolute attribute value of the host machine, and converts the relative attribute value to obtain the slave machine trimming amount corresponding to the local machine; the first slave machine inputs the reference control quantity sent by the host machine and the slave machine fine adjustment quantity sent by the controller into the open loop control loop corresponding to the first slave machine, outputs the slave machine control quantity, enables the adjusted first slave machine to realize hardware current sharing or power sharing along with the host machine, and carries out adjustment and calibration respectively through the first slave machine controlled by the open loop, so that the adjustment mode is more flexible, the control is easier, and the calibration working efficiency can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of an open-loop control method for a slave according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a master-slave parallel system provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of connection between at least one slave and a master respectively according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic diagram of an open-loop control method for a slave according to an embodiment of the present invention, where the open-loop control method for the slave is applied to a master-slave parallel system formed by a plurality of power modules connected in parallel and a controller, and as shown in fig. 2, the plurality of parallel power modules may form an Uninterruptible Power System (UPS), where the power modules may be inverters such as AC-AC, DC-AC, or DC-DC. Furthermore, a plurality of UPSs can be connected in parallel to form a large parallel system, the parallel system comprises a plurality of small parallel systems, and each small parallel system comprises a plurality of parallel power supply modules.
Optionally, any power module in the master-slave parallel system may be a master, and the rest of the power modules may be slaves. And the power circuits of the power supply modules are the same. Wherein the host executes a closed-loop control method. In all the slaves, part of the slaves can execute the open-loop control method, part of the slaves can execute the closed-loop control method, or all the slaves can execute the open-loop control method. In the present embodiment, whether all the slaves perform the open-loop control method or some of the slaves perform the open-loop control method, at least one of the slaves that performs the open-loop control method is named as a first slave for distinction.
Optionally, before the parallel system shown in fig. 2 is formed by the power modules and the controllers connected in parallel, the same test conditions may be adopted to respectively detect the electrical parameters of all the power modules, and the electrical parameters are converted into absolute attribute values and stored in the corresponding power modules, so that the first slave machine performing open-loop control may be subsequently regulated and controlled, and the regulated first slave machine follows the master machine to implement hardware current sharing or power sharing. The electrical parameter may comprise a voltage parameter, a current parameter or a power parameter.
The open-loop control method executed by the first slave machine comprises the following steps:
and step 101, sending the absolute attribute value of the local computer to the controller.
Optionally, the controller receives the absolute attribute value sent by the first slave machine, and also receives the absolute attribute value sent by the host machine, and then calculates a relative attribute value according to the absolute attribute value of the local machine and the absolute attribute value of the host machine, and converts the relative attribute value to obtain the slave machine trimming amount corresponding to the local machine. The absolute property values are used to characterize the intrinsic properties of the power supply module.
Optionally, the controller calculates a relative attribute value according to the absolute attribute value of the local computer and the absolute attribute value of the master computer, that is, calculates a difference between the absolute attribute value of the first slave computer and the absolute attribute value of the master computer, and uses the obtained difference as the relative attribute value.
Optionally, the controller converts the relative attribute value to obtain a slave trimming amount corresponding to the local machine, that is, converts the relative attribute value to a value having the same attribute or format as the reference control amount of the host machine, and uses the value as the slave trimming amount corresponding to the local machine. And the reference control quantity of the master machine is the control quantity sent when the master machine executes the closed-loop control method, and the control quantity is used as the reference control quantity to regulate and control the first slave machine.
For example, the control amount sent by the host computer may be a PWM signal, i.e., the reference control amount is a PWM signal. Therefore, the relative attribute value needs to be converted to have the same attribute or the same format as the reference control quantity of the master, that is, the relative attribute value needs to be converted to a PWM signal form, so that the slave can be directly adjusted in the following process. Of course, the control quantity sent by the host may also be a signal before being input to the pulse modulation unit, and the signal is input to the pulse modulation unit and then outputs a PWM signal, only the relative attribute value needs to be converted into a value with the same attribute or format corresponding to the relative attribute value.
And 102, receiving the slave trimming quantity sent by the controller and receiving the reference control quantity sent by the host.
Optionally, before performing fine adjustment, the first slave first obtains a slave fine adjustment amount calculated by the controller, receives a reference control amount sent when the master executes the closed-loop control method, and then continues to execute step 103.
And 103, inputting the reference control quantity and the slave trimming quantity into an open-loop control loop corresponding to the local machine, and then outputting a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
Optionally, this step may include: and the first slave machine outputs the slave machine control quantity after inputting the open loop control loop corresponding to the first slave machine after performing superposition processing on the reference control quantity and the slave machine fine adjustment quantity.
Optionally, the first slave includes a Complex Programmable Logic Device (CPLD) unit or a Field Programmable Gate Array (FPGA) unit, and is configured to input the reference control quantity and the slave trimming quantity of the local slave into an open-loop control loop corresponding to the local slave and output the slave control quantity. The CPLD unit or the FPGA unit in the first slave machine adjusts the duty ratio of the converted local PWM signal according to the reference PWM signal sent by the host machine, and the converted local PWM signal is the same as the reference PWM signal of the host machine, so that the hardware current sharing or power sharing of the host machine and the slave machine is realized.
The open-loop control method of the slave machine sends the absolute attribute value of the local machine to the controller through the first slave machine, calculates the relative attribute value according to the absolute attribute value of the local machine and the absolute attribute value of the host machine by the controller, and converts the relative attribute value to obtain the slave machine trimming amount corresponding to the local machine; and then the first slave inputs the slave trimming quantity sent by the receiving controller and the reference control quantity sent by the receiving host into an open loop control loop corresponding to the first slave and then outputs the slave control quantity, so that the adjusted control quantity of the first slave is the same as that of the host, and the hardware current sharing or power sharing is realized. All the first slave machines controlled in an open loop mode are adjusted and calibrated respectively, so that the adjustment mode is more flexible and easier to control, the mutual influence between the master machines and the slave machines caused by the fact that all the master machines and the slave machines adopt a closed loop control method in the prior art is avoided, the hardware current sharing or power sharing is difficult to realize, and the open loop control method of the slave machines can improve the calibration working efficiency.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The present embodiment further provides a master-slave parallel system, as shown in fig. 2, including a plurality of power modules and controllers connected in parallel, where any power module is a master and the other power modules are slaves, where at least one first slave in the slaves executes the open-loop control method for the slave provided in any of the above embodiments, and the power modules each store an absolute attribute value of the slave in advance, where the absolute attribute value is used to represent an inherent attribute of the power module.
The power supply modules can be converters such as AC-AC, DC-AC or DC-DC, and the power circuits of the power supply modules are the same. Optionally, some of the slaves may execute the open-loop control method, some of the slaves may execute the closed-loop control method, or all of the slaves may execute the open-loop control method. In the present embodiment, whether all the slaves perform the open-loop control method or some of the slaves perform the open-loop control method, at least one of the slaves that performs the open-loop control method is named as a first slave for distinction. Optionally, when the number of the slaves is at least two, the open-loop control loops of the at least two slaves are the same.
Optionally, the absolute attribute values are obtained by respectively detecting electrical parameters of all power modules under the same test conditions and converting the electrical parameters, and the absolute attribute values are stored in the corresponding power modules, so that the first slave machine performing open-loop control can be subsequently regulated and controlled, and the regulated first slave machine can realize hardware current sharing or power sharing along with the host machine. The electrical parameter may comprise a voltage parameter, a current parameter or a power parameter.
As shown in fig. 2, in the master-slave parallel system, the controller obtains absolute attribute values of all power modules, calculates a relative attribute value of any one of the first slaves with respect to the master according to the absolute attribute value of any one of the first slaves and the absolute attribute value of the master, converts the obtained relative attribute value to obtain a slave trimming amount, and sends the slave trimming amount to a corresponding first slave.
Optionally, the controller calculates a relative attribute value of any first slave machine with respect to the host machine according to the absolute attribute value of any first slave machine and the absolute attribute value of the host machine, that is, calculates a difference between the absolute attribute value of any first slave machine and the absolute attribute value of the host machine, and uses the obtained difference as the relative attribute value.
Optionally, the controller converts the relative attribute value to obtain a slave fine adjustment amount, that is, converts the relative attribute value to a value having the same attribute or format as the reference control amount of the master, and uses the value as the slave fine adjustment amount of the first slave corresponding to the local computer. And the reference control quantity of the master machine is the control quantity sent when the master machine executes the closed-loop control method, and the control quantity is used as the reference control quantity to regulate and control the first slave machine.
For example, the control amount sent by the host computer may be a PWM signal, i.e., the reference control amount is a PWM signal. Therefore, the relative attribute value needs to be converted to have the same attribute or the same format as the reference control quantity of the master, that is, the relative attribute value needs to be converted to a PWM signal form, so that the slave can be directly adjusted in the following process.
And the master machine outputs a reference control quantity according to the closed-loop control loop, and sends the reference control quantity to any one of the first slave machines, wherein the reference control quantity is used for controlling the master machine.
And any first slave inputs the reference control quantity and the slave fine adjustment quantity of the local machine into an open loop control loop corresponding to the local machine and then outputs a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
Optionally, any first slave adds the reference controlled variable and the slave fine tuning variable of the local slave, inputs the added reference controlled variable into an open loop control loop corresponding to the local slave, and outputs the slave controlled variable.
Optionally, the first slave includes a CPLD unit or an FPGA unit, and is configured to output the slave control quantity after inputting the reference control quantity and the slave trimming quantity of the local slave into the open-loop control loop corresponding to the local slave. The CPLD unit or the FPGA unit in the first slave machine adjusts the duty ratio of the converted local PWM signal according to the reference PWM signal sent by the host machine, and the converted local PWM signal is the same as the reference PWM signal of the host machine, so that the hardware current sharing or power sharing of the host machine and the slave machine is realized.
Optionally, the connection diagram of the master and slave devices is shown in fig. 3. The host comprises a first interface and a second interface; each slave comprises a third interface and a fourth interface;
the first interface of the master computer is connected with the third interface of each slave computer; and the second interface of the master machine is connected with the fourth interface of each slave machine, wherein the first interface and the third interface are used for the input of the parallel connection of the power supply modules, and the second interface and the fourth interface are used for the output of the parallel connection of the power supply modules.
When the slave computer needs to be adjusted, the slave computer can be connected to the host computer through the connection relation between the host computer and the slave computer, and the plug and play function is achieved, so that the operation is convenient.
In the master-slave parallel system, the absolute attribute values of all the power modules are obtained through the controller, the relative attribute value of any first slave relative to the master is obtained through calculation according to the absolute attribute value of any first slave and the absolute attribute value of the master, the obtained relative attribute value is converted to obtain the slave trimming amount, and the slave trimming amount is sent to the corresponding first slave; the master machine outputs a reference control quantity according to the closed-loop control loop and sends the reference control quantity to any one of the first slave machines; and any first slave inputs the reference control quantity and the slave fine adjustment quantity of the local machine into the open loop control loop corresponding to the local machine and then outputs the slave control quantity, so that the adjusted control quantity of the first slave is the same as that of the master machine, and the hardware current sharing or power sharing is realized. All the first slave machines controlled in an open loop mode are adjusted and calibrated respectively, so that the adjustment mode is more flexible and easier to control, the mutual influence between the master machines and the slave machines caused by the fact that all the master machines and the slave machines adopt a closed loop control method in the prior art is avoided, the hardware current sharing or power sharing is difficult to realize, and the open loop control method of the slave machines can improve the calibration working efficiency.
The embodiment of the invention also provides a power supply module which is applied to the master-slave parallel system in any embodiment and has all the beneficial effects brought by the master-slave parallel system.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The open-loop control method of the slave machine is applied to a master-slave machine parallel system formed by a plurality of power supply modules and controllers which are connected in parallel, wherein any power supply module is a master machine, and the rest power supply modules are slave machines, and is characterized in that at least one first slave machine in the slave machines executes the open-loop control method, and the open-loop control method executed by the first slave machine comprises the following steps:
sending the absolute attribute value of the local machine to the controller, calculating by the controller according to the absolute attribute value of the local machine and the absolute attribute value of the host machine to obtain a relative attribute value, and converting the relative attribute value to obtain a slave trimming amount corresponding to the local machine; the absolute attribute value is used for representing the inherent attribute of the power supply module;
receiving a slave trimming quantity sent by the controller and receiving a reference control quantity sent by the host;
and inputting the reference control quantity and the slave trimming quantity into an open-loop control loop corresponding to the local machine, and then outputting a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
2. The slave open-loop control method according to claim 1, wherein the converting the relative attribute value into the slave trimming amount corresponding to the local machine includes:
and converting the relative attribute value into a value with the same attribute or format as the reference control quantity of the host, and taking the value as the slave trimming quantity corresponding to the host.
3. The slave open-loop control method according to claim 2, wherein the outputting the slave control variable after inputting the reference control variable and the slave trimming variable into the open-loop control loop corresponding to the slave includes:
and after the reference control quantity and the slave fine adjustment quantity are subjected to superposition processing, the reference control quantity and the slave fine adjustment quantity are input into an open loop control loop corresponding to the local machine, and then slave control quantity is output.
4. The open-loop control method of the slave according to any one of claims 1 to 3, further comprising, before the parallel system consisting of a plurality of parallel-connected power modules and controllers:
and respectively detecting the electrical parameters of all the power supply modules under the same test conditions, converting the electrical parameters into absolute attribute values and storing the absolute attribute values in the corresponding power supply modules.
5. The slave open loop control method of claim 4, wherein the electrical parameter comprises a voltage parameter, a current parameter, or a power parameter.
6. A master-slave parallel system is characterized by comprising a plurality of power supply modules and controllers which are connected in parallel, wherein any power supply module is a master computer, the rest power supply modules are slave computers, at least one first slave computer in the slave computers executes the open-loop control method of the slave computer in any one of the claims 1 to 5, the power supply modules are internally and pre-stored with the absolute attribute values of the slave computers, and the absolute attribute values are used for representing the inherent attributes of the power supply modules;
the controller acquires absolute attribute values of all power modules, calculates a relative attribute value of any first slave relative to the host according to the absolute attribute value of any first slave and the absolute attribute value of the host, converts the obtained relative attribute value to obtain a slave trimming value, and sends the slave trimming value to the corresponding first slave;
the master machine outputs a reference control quantity according to the closed-loop control loop, and sends the reference control quantity to any one of the first slave machines, wherein the reference control quantity is used for controlling the master machine;
and any first slave inputs the reference control quantity and the slave fine adjustment quantity of the local machine into an open loop control loop corresponding to the local machine and then outputs a slave control quantity, wherein the slave control quantity is used for controlling the local machine.
7. The master-slave parallel system according to claim 6, wherein the power circuits of the power modules are identical.
8. The master-slave parallel system of claim 6,
the first slave machine comprises a CPLD unit or an FPGA unit and is used for outputting the control quantity of the slave machine after inputting the reference control quantity and the slave machine trimming quantity of the first slave machine into an open loop control loop corresponding to the first slave machine.
9. The master-slave parallel system as claimed in claim 6, wherein when the number of slaves is at least two, the open loop control loops of at least two slaves are the same.
10. A power supply module, characterized by being applied to the master-slave parallel system of any one of claims 6 to 9.
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| CN202010290841.6A CN111555424A (en) | 2020-04-14 | 2020-04-14 | Slave open-loop control method and master-slave parallel system |
| PCT/CN2020/128584 WO2021208415A1 (en) | 2020-04-14 | 2020-11-13 | Open-loop control method for slave and master-slave parallel connection system |
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| WO2021208415A1 (en) * | 2020-04-14 | 2021-10-21 | 科华恒盛股份有限公司 | Open-loop control method for slave and master-slave parallel connection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021208415A1 (en) * | 2020-04-14 | 2021-10-21 | 科华恒盛股份有限公司 | Open-loop control method for slave and master-slave parallel connection system |
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