CN110783908A - Control method and device of power supply allocation equipment and power supply allocation equipment - Google Patents
Control method and device of power supply allocation equipment and power supply allocation equipment Download PDFInfo
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Abstract
The application provides a control method and device of power supply allocation equipment and the power supply allocation equipment, which are used for solving the problem of real-time power matching of the power supply equipment and the power utilization equipment. The control method of the power supply allocation equipment comprises the following steps: monitoring, namely monitoring the real-time current sum of the electric equipment as the current total current; judging whether the current total current reaches a preset first current threshold value; an adjusting step, namely reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold; the first current threshold value is smaller than an overcurrent protection value of the power supply allocation equipment, and the power consumption of the electric equipment is actively limited or reduced before the current approaches the overcurrent protection value, so that the overcurrent protection problem of a power supply system is prevented, and the power consumption of the electric equipment is adaptive to the power supply power of the power supply equipment.
Description
Technical Field
The present application relates to the field of energy, and in particular, to a method and an apparatus for controlling a power supply allocating device, and a power supply allocating device.
Background
With the rapid growth and utilization of new energy sources such as distributed photovoltaic power generation and electric energy storage technologies, energy supply and energy consumption based on the common direct current bus have obvious energy-saving benefit advantages.
In distributed application, the benefits are optimal when the power generation, the power storage and the power utilization reach a balanced proportion. However, under the current conditions, the power supply device and the power utilization device have great difficulty in matching power: when the power currently provided by the power supply device is less than the current power of the electrical device, system fault protection is caused, which typically results in the electrical device being shut down or malfunctioning.
Therefore, solving the real-time power matching problem between the power supply device and the power utilization device is a problem to be solved in the art.
Disclosure of Invention
The application provides a control method and device of power supply allocation equipment and the power supply allocation equipment, which are used for solving the problem of real-time power matching of the power supply equipment and the power utilization equipment.
In order to solve the above-mentioned problems, as one aspect of the present application, there is provided a control method of a power supply matching device for matching power supply of an electric device, including:
monitoring, namely monitoring the real-time current sum of the electric equipment as the current total current;
judging whether the current total current reaches a preset first current threshold value;
an adjusting step, namely reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold;
the first current threshold is smaller than an overcurrent protection value of the power supply allocation equipment.
Optionally, the adjusting step includes:
when the current total current is not less than the first current threshold and less than the second current threshold, limiting the power utilization;
and/or the presence of a gas in the gas,
when the current total current is not less than the second current threshold, reducing the power consumption;
and the second current threshold is smaller than the overcurrent protection value and is larger than the first current threshold.
Optionally, the adjusting step comprises:
when the current total current is not less than the first current threshold and less than the second current threshold, sending a frequency limiting instruction to the electric equipment to limit the operating frequency of the electric equipment, so as to limit the electric power of the electric equipment;
and/or the presence of a gas in the gas,
and when the current total current is not less than the second current threshold, sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment, so that the electric power of the electric equipment is reduced.
Optionally, the adjusting step comprises:
when the current total current is not less than the first current threshold and less than the second current threshold, reducing the power supply voltage provided for the electric equipment by a first voltage value, and limiting the increase of the electric power of the electric equipment for a first time;
and/or the presence of a gas in the gas,
when the current total current is not less than the second current threshold value, reducing the power supply voltage provided for the electric equipment by a second voltage value, and reducing the electric power of the electric equipment for a second duration;
wherein the second voltage value is greater than the first voltage value.
Optionally, the power utilization equipment is connected with the power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus;
and/or the power supply allocation equipment is an intelligent converter.
The present application further provides a control device of a power supply allocation device, where the power supply allocation device is used for allocating power supplies of electric devices, and includes:
the monitoring unit is used for monitoring the real-time current sum of the electric equipment as the current total current;
the judging unit is used for judging whether the current total current reaches a preset first current threshold value;
the adjusting unit is used for reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold;
the first current threshold is smaller than an overcurrent protection value of the power supply allocation equipment.
Optionally, the adjusting unit is configured to:
when the current total current is not less than the first current threshold and less than the second current threshold, limiting the power utilization;
and/or the presence of a gas in the gas,
when the current total current is not less than the second current threshold, reducing the power consumption;
and the second current threshold is smaller than the overcurrent protection value and is larger than the first current threshold.
Optionally, the adjusting device is configured to send a frequency limiting instruction to the electric device to limit the operating frequency of the electric device when the current total current is not less than the first current threshold and is less than the second current threshold, so as to limit the electric power of the electric device;
and/or the regulating equipment is used for sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment when the current total current is not less than the second current threshold value, so that the electric power of the electric equipment is reduced.
Optionally, the adjusting device is configured to reduce the supply voltage provided to the electrical device by a first voltage value when the current total current is not less than the first current threshold and is less than the second current threshold, and the electrical device limits the increase of the power consumption for a first duration;
and/or the presence of a gas in the gas,
the regulating device is used for reducing the power supply voltage provided for the electric equipment by a second voltage value when the current total current is not less than a second current threshold value, and reducing the power consumption power of the electric equipment for a second duration;
wherein the second voltage value is greater than the first voltage value.
Optionally, the power utilization equipment is connected with the power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus;
and/or the power supply allocation equipment is an intelligent converter.
The present application further provides a power supply allocation apparatus, which includes a processor, a memory, and a program stored in the memory and capable of running on the processor, and when the processor executes the program, the steps of any one of the control methods provided in the present application are implemented, or the power supply allocation apparatus includes any one of the control devices provided in the present application.
The application provides a control method and device of power supply allocation equipment and the power supply allocation equipment, wherein a first current threshold value lower than an overcurrent protection value is set, and before a current approaches the overcurrent protection value, the power consumption of electric equipment is actively limited or reduced, so that the overcurrent protection problem of a power supply system is prevented, and the power consumption of the electric equipment is adaptive to the power supply power of the power supply equipment.
Drawings
Fig. 1 is a flowchart illustrating a control method of a power supply allocation apparatus according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a power supply system according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of another control method for power allocation equipment according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of another control method for a power supply dispatching device according to an embodiment of the present application;
fig. 5 is a block diagram of a control device of a power supply allocation apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, in a system adopting a common direct-current bus, for example, a household power system adopting solar power supply, the power supply device and the electric equipment have the problem of unmatched power supply, and when the total power consumption of the electric equipment is greater than the power supply power that the power supply device can supply, fault protection (over-current protection) can occur in the system, so that the electric equipment stops suddenly, the user experience is low, and the electric equipment is easy to damage.
In order to solve the problem that the supply of the power supply equipment is not matched with the supply of the electrical equipment, the present application provides a control method of a power supply allocation equipment, in the present application, the power supply allocation equipment is used for allocating the power supply of the electrical equipment, and the control method provided by the present application is as shown in fig. 1, and includes:
monitoring, namely monitoring the real-time current sum of the electric equipment as the current total current;
specifically, taking household electricity as an example, the number of the electrical devices in a household may be one or more, each electrical device has a working current when operating, the working current changes along with the working state, and the sum of the real-time currents of each electrical device at the current moment is the current total current.
Judging whether the current total current reaches a preset first current threshold value;
an adjusting step, namely reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold;
specifically, the power supply equipment is normally supplied according to rated voltage, and the power supply equipment is limited by the power which can be supplied, and is provided with an overcurrent protection value of current, when the current total current of the electric equipment reaches the overcurrent protection value, the fault protection of the power supply system is caused, therefore, the first current threshold is set to be smaller than the overcurrent protection value of the power supply regulating device in the present application, that is, before the power supply power of the power supply device cannot meet the requirement of the electric equipment, namely, the current approaches to the overcurrent protection value, the power consumption of the electric equipment is reduced or limited, so that the current total current can not reach the overcurrent protection value, therefore, overcurrent protection of system faults is prevented, and the limitation of the power utilization of the electric equipment in the application means that the power utilization of the electric equipment is prevented from further increasing, namely that the power utilization is not higher than the current power utilization after the electric equipment is limited.
According to the power supply system, the first current threshold value lower than the overcurrent protection value is set, and before the current is close to the overcurrent protection value, the power consumption of the electric equipment is actively limited or reduced, so that the overcurrent protection problem of the power supply system is prevented, and the power consumption of the electric equipment is adaptive to the power supply power of the power supply equipment.
In some alternative embodiments, the adjusting step comprises:
when the current total current is not less than the first current threshold and less than the second current threshold, limiting the power utilization; and/or when the current total current is not less than the second current threshold, reducing the power consumption;
and the second current threshold is smaller than the overcurrent protection value and is larger than the first current threshold.
Specifically, in an actual use situation, even when the electric device limits the electric power, the user may turn on another electric device, which causes the current total current to further increase, and some other devices working at regular time may cause the current total current to increase, so that after the operation of limiting the electric power is performed, the overcurrent protection still may occur, and therefore, a second current threshold is further set in the present application, the second current threshold is smaller than the overcurrent protection value, and when the current total current reaches the second circuit threshold, the electric power of the electric device is reduced, so that even if the current fluctuates or other devices are enabled, the occurrence of the system fault current protection can be prevented
In some alternative embodiments, the adjusting step comprises: when the current total current is not less than the first current threshold and less than the second current threshold, sending a frequency limiting instruction to the electric equipment to limit the operating frequency of the electric equipment, so as to limit the electric power of the electric equipment;
and/or when the current total current is not less than the second current threshold, sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment, so as to reduce the electric power of the electric equipment.
Specifically, the second current threshold is greater than the first current threshold, in this embodiment, the electric device may be a frequency conversion device, the frequency conversion device is controlled by sending a frequency limit instruction and a frequency reduction instruction to the frequency conversion device, and specifically, the frequency limit instruction and the frequency limit instruction may be sent to each frequency conversion device through the CAN bus.
In some alternative embodiments, the adjusting step comprises: when the current total current is not less than the first current threshold and less than the second current threshold, reducing the power supply voltage provided for the electric equipment by a first voltage value, and limiting the increase of the electric power of the electric equipment for a first time; and/or when the current total current is not less than the second current threshold value, reducing the power supply voltage provided for the electric equipment by a second voltage value, and reducing the electric power of the electric equipment for a second time period.
Specifically, the second voltage value is greater than the first voltage value, and when the current total current reaches the first current threshold, the first voltage value is reduced, so that the real-time power of each electric device is correspondingly reduced, and when the current total current reaches the current threshold, the voltage value is further reduced, so that the total power is reduced.
In some optional embodiments, the power utilization equipment is connected with the power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus; and/or the power supply allocation equipment is an intelligent converter.
For a better illustration of the present application, a preferred embodiment is presented below.
Specifically, in this embodiment, the power supply system is composed as shown in fig. 2, the power supply allocation device is an intelligent converter, the intelligent converter is connected to a power grid and a solar photovoltaic system serving as power supply devices, each consumer DC400V is connected to the intelligent converter, the intelligent converter is connected to each consumer through a CAN bus communication network, and the consumers in this embodiment include a variable frequency air conditioner load 1, a variable frequency air conditioner load 2, and a variable frequency air conditioner load 3.
The intelligent converter is used as energy supply and allocation equipment of a system, and the variable-frequency-regulated power utilization load has the function of stepless or graded regulation of power utilization power and has a power distribution response function. The utilization of distributed energy is constructed by the connection of the direct current buses.
The capacity and the operation specification of the intelligent converter are determined in the design and model selection stage, along with the increase of the power load, or the limitation of a superior energy source, or the change of the working condition of the intelligent converter, the output of the energy is required to be limited, and the energy required by the power load may exceed the energy which can be provided by the intelligent converter currently.
In order to solve the above problem, this embodiment adopts two optional control methods, and fig. 3 is a first control method: based on the CAN bus network between intelligent converter and the variable frequency load. The intelligent converter monitors the current total current It providing energy in real time, a power limiting/power reducing instruction is sent before It approaches the power limitation condition provided by the energy of the intelligent converter, and after receiving the instruction, each variable-frequency electric device connected to the direct-current bus makes a measure for limiting the continuous increase of the power or reduces the current electric power. The power generation and the power utilization energy balance of the system are maintained. Specifically, when the current total current It is not less than the first current threshold I0 but less than the second current threshold I2, the frequency limit instruction information is sent through the CAN bus, and the frequency conversion power utilization load receives the instruction and then limits the operation frequency, so that the power utilization power cannot be increased. When the current total current It is not less than the second current threshold, frequency reduction instruction information is sent out through the CAN bus, and the frequency conversion power utilization load receives an instruction, so that the operating frequency is reduced, and the power utilization power is reduced. According to the control method, when the power supply equipment detects that the power cannot meet the requirement of the power utilization equipment, namely the current is close to the overcurrent protection value, the power limiting and power reducing instruction information is sent to the power utilization equipment through the communication bus, and after the power limiting and power reducing instruction is received by the power utilization equipment, the load power is actively reduced, so that the power limitation of the power supply equipment is adapted.
Fig. 4 shows a second alternative control method: during the process of regulating the electric loads by the variable frequency system, the power provided by the energy source of the intelligent converter is increased along with the gradual increase of the power of the electric loads, before the power and current limit values are increased, namely the current total current is not less than a first current threshold value I0 but less than a second current threshold value I1, the voltage value of the direct current bus is actively controlled by the intelligent converter to be lower than a rated value of 5V, and each variable frequency electric load lasts for 200 milliseconds after monitoring the change of the voltage of the direct current bus, namely responds to the limiting measure of not increasing the power. And if the output power and the current of the intelligent converter continuously exceed the limit values, namely the current total current is not less than a second current threshold value I1, the intelligent converter continuously and actively controls the voltage value of the direct current bus to be lower than the rated value by 10V, and each variable-frequency electric load lasts for 200 milliseconds after monitoring the change of the voltage of the direct current bus, namely responding to a measure for reducing the consumed power by 5%. According to the control method, when the power supply equipment detects that the power cannot meet the requirements of the power utilization equipment, namely the current approaches to an overcurrent protection value, the stable voltage of the direct current bus is actively reduced; after monitoring that the voltage of the direct current bus is lower than the rated voltage, the energy consumption equipment actively reduces the load power and adapts to the power limitation of the power supply equipment.
The present application further provides a control device of a power supply allocation device, where the power supply allocation device is used for allocating power supplies of electric devices, and includes:
the monitoring unit 10 is used for monitoring the real-time current sum of the electric equipment as the current total current;
the judging unit 20 is configured to judge whether the current total current reaches a preset first current threshold;
the adjusting unit 30 is used for reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold;
the first current threshold is smaller than an overcurrent protection value of the power supply allocation equipment.
Optionally, the adjusting unit is configured to:
when the current total current is not less than the first current threshold and less than the second current threshold, limiting the power utilization; and/or when the current total current is not less than the second current threshold, reducing the power consumption;
and the second current threshold is smaller than the overcurrent protection value and is larger than the first current threshold.
Optionally, the adjusting device is configured to send a frequency limiting instruction to the electric device to limit the operating frequency of the electric device when the current total current is not less than the first current threshold and is less than the second current threshold, so as to limit the electric power of the electric device;
and/or the regulating equipment is used for sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment when the current total current is not less than the second current threshold value, so that the electric power of the electric equipment is reduced.
Optionally, the adjusting device is configured to reduce the supply voltage provided to the electrical device by a first voltage value when the current total current is not less than the first current threshold and is less than the second current threshold, and the electrical device limits the increase of the power consumption for a first duration;
and/or the regulating device is used for reducing the power supply voltage provided for the electric equipment by a second voltage value when the current total current is not less than a second current threshold value, and reducing the electric power of the electric equipment for a second duration;
wherein the second voltage value is greater than the first voltage value.
Optionally, the power utilization equipment is connected with the power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus; and/or the power supply allocation equipment is an intelligent converter.
The present application further provides a power supply allocation apparatus, which includes a processor, a memory, and a program stored in the memory and capable of running on the processor, and when the processor executes the program, the steps of any one of the control methods provided in the present application are implemented, or the power supply allocation apparatus includes any one of the control devices provided in the present application.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (11)
1. A control method of a power supply allocating device, which is used for allocating power supply of electric equipment, is characterized by comprising the following steps:
monitoring, namely monitoring the real-time current sum of the electric equipment as the current total current;
judging whether the current total current reaches a preset first current threshold value;
an adjusting step, namely reducing or limiting the power consumption of the electric equipment when the current total current reaches a preset first current threshold;
wherein the first current threshold is less than an overcurrent protection value of the power supply allocation equipment.
2. The method for controlling a power supply dispatching equipment according to claim 1, wherein the adjusting step comprises:
when the current total current is not less than a first current threshold and less than a second current threshold, limiting the power utilization power;
and/or the presence of a gas in the gas,
when the current total current is not less than a second current threshold value, reducing the electricity utilization power;
wherein the second current threshold is less than the over-current protection value and greater than the first current threshold.
3. The method for controlling a power supply dispatching device according to claim 2, wherein the adjusting step comprises:
when the current total current is not less than a first current threshold and less than a second current threshold, sending a frequency limiting instruction to the electric equipment to limit the operating frequency of the electric equipment, so as to limit the electric power of the electric equipment;
and/or the presence of a gas in the gas,
and when the current total current is not less than a second current threshold value, sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment, so that the electric power of the electric equipment is reduced.
4. The method for controlling a power supply dispatching device according to claim 2, wherein the adjusting step comprises:
when the current total current is not less than a first current threshold and less than a second current threshold, reducing the power supply voltage provided for the electric equipment by a first voltage value, wherein the electric equipment continuously limits the increase of the electric power for a first time;
and/or the presence of a gas in the gas,
when the current total current is not less than a second current threshold value, reducing the power supply voltage provided for the electric equipment by a second voltage value, and reducing the power consumption of the electric equipment for a second duration;
wherein the second voltage value is greater than the first voltage value.
5. The method for controlling a power supply appropriating apparatus according to any one of claims 1 to 4,
the power utilization equipment is connected with power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus;
and/or the power supply allocation equipment is an intelligent converter.
6. A control apparatus for a power supply allocating device, the power supply allocating device being configured to allocate power supply to a power consuming device, comprising:
the monitoring unit is used for monitoring the real-time current sum of the electric equipment as the current total current;
the judging unit is used for judging whether the current total current reaches a preset first current threshold value;
the adjusting unit is used for reducing or limiting the electricity utilization power of the electricity utilization equipment when the current total current reaches a preset first current threshold;
wherein the first current threshold is less than an overcurrent protection value of the power supply allocation equipment.
7. The control device of a power supply dispatching equipment according to claim 6, wherein the regulating unit is configured to:
when the current total current is not less than a first current threshold and less than a second current threshold, limiting the power utilization power;
and/or the presence of a gas in the gas,
when the current total current is not less than a second current threshold value, reducing the electricity utilization power;
wherein the second current threshold is less than the over-current protection value and greater than the first current threshold.
8. The control device of a power supply dispatching equipment of claim 7,
the adjusting device is used for sending a frequency limiting instruction to the electric equipment to limit the operating frequency of the electric equipment when the current total current is not less than a first current threshold and less than a second current threshold, so that the electric power of the electric equipment is limited;
and/or the presence of a gas in the gas,
and the adjusting equipment is used for sending a frequency reduction instruction to the electric equipment to reduce the operating frequency of the electric equipment when the current total current is not less than a second current threshold value, so that the power consumption of the electric equipment is reduced.
9. The control device of a power supply dispatching equipment of claim 7,
the regulating device is used for reducing the power supply voltage provided for the electric equipment by a first voltage value when the current total current is not less than a first current threshold and less than a second current threshold, and the electric equipment continuously limits the increase of the electric power for a first time;
and/or the presence of a gas in the gas,
the regulating device is used for reducing the power supply voltage provided for the electric equipment by a second voltage value when the current total current is not less than a second current threshold value, and the electric equipment reduces the power consumption for a second time;
wherein the second voltage value is greater than the first voltage value.
10. The control device of a power supply dispatching equipment according to any one of claims 6-9,
the power utilization equipment is connected with power supply equipment through a common direct current bus, the power supply allocation equipment is arranged on the direct current bus, and the current total current is determined by monitoring the current on the common direct current bus;
and/or the power supply allocation equipment is an intelligent converter.
11. A power supply matching apparatus comprising a processor, a memory, and a program stored in the memory and operable on the processor, wherein the processor executes the program to implement the steps of the control method according to any one of claims 1 to 5, or wherein the power supply matching apparatus comprises the control device according to any one of claims 6 to 11.
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| CN112467683A (en) * | 2020-10-19 | 2021-03-09 | 珠海格力电器股份有限公司 | PIM module overcurrent fault detection and overcurrent protection device and method |
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