CN112542840A - Impact load control method for household energy management system - Google Patents
Impact load control method for household energy management system Download PDFInfo
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- CN112542840A CN112542840A CN202011352817.7A CN202011352817A CN112542840A CN 112542840 A CN112542840 A CN 112542840A CN 202011352817 A CN202011352817 A CN 202011352817A CN 112542840 A CN112542840 A CN 112542840A
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- management system
- energy management
- impact load
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/12—The local stationary network supplying a household or a building
- H02J2310/14—The load or loads being home appliances
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an impact load control method of a household energy management system, which aims at protecting a household miniature circuit breaker provided with the household energy management system from tripping caused by impact load influence. The household energy management system is used for managing the household power utilization condition, and the circuit breaker can be effectively prevented from tripping when a high-power load is started. The invention does not need to add extra equipment or replace the original circuit breaker, and has convenient implementation and low cost. The whole control process of the invention is counted, calculated and executed by the energy management system, and the invention does not need human intervention, and is convenient, rapid and effective.
Description
Technical Field
The invention relates to an impact load control method for a household energy management system, and belongs to the technical field of household energy management.
Background
Each household electricity service side is provided with a load main switch which is called a miniature circuit breaker. The function of the miniature circuit breaker is as follows: on one hand, when the household electric load exceeds the designed capacity of the cable, the miniature circuit breaker trips to prevent the household overload electric load from causing safety accidents such as fire disasters and the like. On the other hand, when the household electric circuit needs to be overhauled and reconstructed, the miniature circuit breaker is tripped, and the connection between the household electric circuit and an external power grid is disconnected.
The household impact load mainly refers to an electric load with a motor or a coil. At start-up, the instantaneous rush current may reach 2-3 times the rated current, with some devices being even higher (e.g., devices without soft start functionality).
Along with the improvement of the comfort level of family life, the quantity of the household electrical equipment is increased, the power of some electrical equipment is also increased, and the impact current is very large during starting. If the number of the household electrical equipment in use is large, the power consumption power is high, when one high-power electrical equipment is started, the starting impact current is high, the impact current flowing through the miniature circuit breaker is high at the moment, the circuit breaker is easy to trip, and the whole household is powered off. Fuses may also burn out if they are loaded.
Disclosure of Invention
The invention provides an impact load control method of a household energy management system, aiming at solving the problem that a breaker is easy to trip due to large instantaneous impact current when household impact load is started.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for controlling impact load of a household energy management system is characterized by comprising the following steps:
(1) the household energy management system establishes communication with household electric equipment and monitors a starting signal of an impact load in real time; when a starting signal of the impact load is detected, the household energy management system records a given moment T1 of the starting signal, and searches rated current and impact current of the corresponding impact load according to the starting signal;
(2) counting the total current of the running electric equipment of the current family;
(3) finding out corresponding circuit breaker tripping curve data according to the model of the miniature circuit breaker used by the family at present; calculating a current space pit value reserved for the circuit breaker according to the data obtained in the steps (1) and (2);
(4) calculating and counting the equipment which needs to stop or reduce power to operate according to the calculation result of the current space pit value in the step (3) and the rated power value of each piece of electric equipment;
(5) setting a starting delay time T according to system calculation and control requirements; setting an action signal given time T3 of equipment needing to be stopped or operated with reduced power, wherein T3-T1 is less than T; setting a given time T4 of a recovery signal of the equipment which needs to stop or reduce power according to different time consumed in the starting process of the impact load;
(6) when the system detects that the T3 moment arrives, sending an action signal to equipment needing to stop or reduce power operation;
(7) when the system detects that the T2 moment arrives, T2= T1+ T, controlling the equipment which needs to be stopped or reduced in power to start corresponding actions, and starting the impact load at the same time;
(8) when the system monitors that the T4 moment arrives, a recovery signal for recovering the original working condition is sent to the equipment which stops or reduces the power.
The invention has the beneficial effects that:
(1) the household energy management system is used for managing the household power utilization condition, and the circuit breaker can be effectively prevented from tripping when a high-power load is started.
(2) The circuit breaker is convenient to implement and low in cost without additionally installing additional equipment or replacing the original circuit breaker.
(3) The whole control process is counted, calculated and executed by the energy management system, manual intervention is not needed, and the method is convenient, rapid and effective.
Drawings
FIG. 1 is a household power grid configuration with a household energy management system installed;
fig. 2 is a schematic diagram of a circuit breaker trip curve;
FIG. 3 is a timeline of the control method of the present invention;
fig. 4 is a flow chart of a control method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention. The invention discloses an impact load control method of a household energy management system, which aims at protecting a household miniature circuit breaker provided with the household energy management system from tripping caused by impact load influence. The household power grid with the household energy management system installed in the invention is shown in figure 1. The household energy management system mainly comprises: the system comprises a controller, a battery energy storage system, an intelligent electric meter and the like, and can also be added with a photovoltaic power generation system, an electric automobile charging system and the like along with the expansion of electric equipment. The household energy management system can not only manage the start-stop action of the household electric equipment, but also control the start-stop time by establishing communication connection between the controller and the household electric equipment (comprising electric equipment and electric power facilities).
The miniature circuit breakers installed in families all have an important parameter, namely a circuit breaker tripping characteristic curve. After the current of the tripping curve of the circuit breaker passes through the time corresponding to the curve, the circuit breaker can trip. If the size of the impact current can be known in advance when the impact load is suddenly added, a current space pit (current valley) is reserved on the tripping curve of the circuit breaker in advance, and the current space pit is just filled when the impact current arrives, so that the circuit breaker cannot be tripped in an overload mode.
As shown in fig. 4, the method for controlling the impact load of the home energy management system specifically includes the following steps:
(1) the household energy management system records and stores a load curve and a tripping curve of the miniature circuit breaker used in a household. Aiming at the newly added miniature circuit breaker, the energy management system can be added into the household in the later period and stored according to the requirement. The circuit breaker trip curve is shown in fig. 2, and fig. 2 represents only one model of circuit breaker data.
(2) And counting data of rated current and impact current (3 times of rated current) of the household main electric equipment and the high-power electric equipment, and recording the data into a household energy management system for storage.
(3) The household energy management system establishes good communication with household electrical equipment, controls the start-stop signal of the electrical equipment and delays the start-stop execution of the equipment, and reduces the power operation of the electrical equipment (equipment capable of controlling power, such as semi-bright, full-bright and color of a lamp)
(4) The household energy management system monitors a starting signal of household impact load in real time, and the starting signal is given through terminal equipment (for example, the starting signal is given through a man-machine interaction mode such as a mobile phone APP) or an electrical equipment switch.
(5) When the impact load starting signal is detected, the household energy management system records the given time T1 of the impact load starting signal, and according to the starting signal, the rated current and the impact current of the corresponding impact load stored by the household energy management system are searched.
(6) And counting the total current of the electrical equipment currently operated by the household, wherein the total current can be obtained through a smart meter, and part of rated load current of the electrical equipment currently operated can be obtained through data stored in the system.
(7) And finding corresponding circuit breaker tripping curve data in the household energy management system according to the model of the miniature circuit breaker used by the current household. And (4) calculating a current space pit value I reserved for the circuit breaker according to the data obtained in the steps (5) and (6), wherein the current space pit value is a valley value.
The calculation method comprises the following steps: assuming that the tripping current value of the circuit breaker at the corresponding tripping time t is I1, the impact load impact current is I2, and the total current of the electrical equipment which is currently running is I3;
if I2 > (I1-I3) indicates that the residual capacity of the circuit breaker can not meet the current requirement of the impact load, the extra current capacity required for ensuring the circuit breaker not to trip when the impact load is started is Idet = I2- (I1-I3), and the part of the current capacity is required to be obtained from the running electrical equipment. Idet obtained by calculation is the reserved current space pit value I.
If I2 is less than or equal to (I1-I3), the residual capacity of the circuit breaker is large, and the addition of the impact current I2 can not cause the circuit breaker to trip, and the current space pit value does not need to be reserved.
(8) And (4) calculating and counting the equipment needing to be stopped or the equipment running with reduced power according to the current space pit value calculation result in the step (7) and the rated power value of each electrical equipment in the step (6).
The calculation statistical method comprises the following steps: (7) the required extra current capacity Idet calculated in (6) needs to be deducted from the rated power of the electrical equipment which is running in (6). According to the operation condition of the household electrical equipment, some equipment can be operated by reducing power (determined as class A equipment), such as a lamp A1 with adjustable brightness, An electric heating equipment A2 with adjustable power, a fan A3 with adjustable wind speed, a charging pile A4 and the like (An represents nth equipment); some devices can not reduce power to operate (specified as B type devices), such as a lamp B1 with non-adjustable brightness, a washing machine B2 and an electric kettle B3. According to the current household requirements for the use priority of household appliances and the necessity of normal rated operation (a user can preset the use priority of the household appliances in a household energy management system), firstly counting the current values (the current calculated by the power reduction) which can be reduced by the devices with the lowest priority and capable of reducing the power operation, calculating the current value Id which can be deducted by the devices in operation, such as Idet = Idet _ A1+ Idet _ A2+ Idet _ B2, (Idet _ A1, Idet _ A2 are respectively the current values which can be reduced by the devices A1 and A2, and Idet _ B2 is the current value which can be deducted by the devices B2), if Id < Idet, continuing to increase the actions of the devices of A, B class to obtain larger Id values until Id = Idet is met.
(9) And setting the delay time T according to the system calculation and control requirements. The given time of the impact load starting signal is T1, and the starting execution time after the impact load is delayed by T is T2. If the running equipment needs stopping or power-down running action, the action signal is given to be T3 at a given moment, the moment T3 is automatically calculated and set by the household energy management system, and the actual execution moment of the stopping or power-down action is T2. After the impact load is started, the equipment which acts needs to recover the original working condition, the time when the recovery signal is given is T4, and the time T4 is reasonably calculated according to different time consumed in the starting process of each impact load. The parts are shown in figure 3 at the moment.
Setting T: and (4) calculating the time required for Id calculation in step (8) according to the acquisition time of the energy management system for acquiring the data of the electric equipment, the calculation and processing time of the data, the delay time for issuing an electrical equipment command to the equipment to execute the action, and the time required for Id calculation is set by a software engineer according to a system test result.
Setting of T3: (8) to calculate the Id value end time.
Setting of T4: moment when the impact load starting is finished and the power is restored to the rated value.
(10) When the household energy management system detects that the T3 moment arrives, the action signal is sent according to the running equipment needing action calculated and counted in the step (8). This action signal is given by the energy management system, and after a delay time, the time T2 is reached, and the device performs the corresponding action (power down or stop running). The device does not receive this action signal, which in the energy management system is only used as the start of the delayed execution of the device.
(11) When the household energy management system detects that the T2 moment arrives, the running equipment is controlled to start a setting action (stop or power-down running) and start the impact load.
(12) When the household energy management system monitors that the time T4 comes, which indicates that the impact load is started, the household energy management system sends a recovery signal for recovering the original working condition to the equipment which stops or reduces the power when the impact load is started, and controls the corresponding equipment to recover the original working condition.
At this point, a process of controlling the impact load of the home energy management system is finished.
The principle of the control method of the present invention can be summarized as follows:
the time is the delay time T from the time T1 when the high-power electric device gives the start signal to the time T2 when the device starts to execute. In the delay time, the energy management system calculates the starting impact current of the high-power electrical equipment, calculates the total current of all the electrical equipment which is currently running, searches the corresponding tripping current of the circuit breaker, calculates the size of a current space pit, calculates which electrical equipment needs to be stopped in a short time, and calculates which electrical equipment needs to be reduced in power and power values in a short time. When the impact load is started at the time of T2, the energy management system controls the preset equipment to stop running or reduce power running, and ensures that the circuit breaker is started by the impact load without tripping.
Having thus shown and described embodiments of the present invention, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for controlling impact load of a household energy management system is characterized by comprising the following steps:
(1) the household energy management system establishes communication with household electric equipment and monitors a starting signal of an impact load in real time; when a starting signal of the impact load is detected, the household energy management system records a given moment T1 of the starting signal, and searches rated current and impact current of the corresponding impact load according to the starting signal;
(2) counting the total current of the running electric equipment of the current family;
(3) finding out corresponding circuit breaker tripping curve data according to the model of the miniature circuit breaker used by the family at present; calculating a current space pit value reserved for the circuit breaker according to the data obtained in the steps (1) and (2);
(4) calculating and counting the equipment which needs to stop or reduce power to operate according to the calculation result of the current space pit value in the step (3) and the rated power value of each piece of electric equipment;
(5) setting a starting delay time T according to system calculation and control requirements; setting an action signal given time T3 of equipment needing to be stopped or operated with reduced power, wherein T3-T1 is less than T; setting a given time T4 of a recovery signal of the equipment which needs to stop or reduce power according to different time consumed in the starting process of the impact load;
(6) when the system detects that the T3 moment arrives, sending an action signal to equipment needing to stop or reduce power operation;
(7) when the system detects that the T2 moment arrives, T2= T1+ T, controlling the equipment which needs to be stopped or reduced in power to start corresponding actions, and starting the impact load at the same time;
(8) when the system monitors that the T4 moment arrives, a recovery signal for recovering the original working condition is sent to the equipment which stops or reduces the power.
2. A method of controlling the impact load of a home energy management system as claimed in claim 1, wherein the impact current is 3 times the rated current.
3. The impact load control method for a home energy management system according to claim 1, wherein the total current of the electric devices is obtained by calculating rated load current data of the smart meter and some electric devices stored in the system.
4. A method for controlling impact load of a home energy management system as claimed in claim 1, wherein the start signal of the impact load is from a terminal device or an electrical device switch.
5. The method as claimed in claim 1, wherein the load curve and trip curve of the miniature circuit breaker used in the household, the rated current of the main electric equipment and the high-power electric equipment, and the impact current data are recorded in the household energy management system and stored.
6. A home energy management system impact load control method as claimed in claim 1, characterized in that the current space pit value calculation method reserved for the circuit breaker is as follows:
assuming that the tripping current value corresponding to the tripping time t of the circuit breaker is I1, the impact load impact current is I2, and the total current of the currently running electric equipment is I3;
when I2 > (I1-I3), the reserved current space pit value I = I2- (I1-I3);
when I2 is less than or equal to (I1-I3), the current space pit value does not need to be reserved.
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| CN202011352817.7A CN112542840B (en) | 2020-11-26 | 2020-11-26 | Impact load control method for household energy management system |
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| CN202011352817.7A CN112542840B (en) | 2020-11-26 | 2020-11-26 | Impact load control method for household energy management system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584812U (en) * | 2009-07-29 | 2010-09-15 | 国网电力科学研究院 | Domestic intelligent power distribution terminal |
| CN111009922A (en) * | 2019-12-20 | 2020-04-14 | 宝鸡石油机械有限责任公司 | Management system with heavy-load inquiry and power reduction protection functions and management method |
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- 2020-11-26 CN CN202011352817.7A patent/CN112542840B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584812U (en) * | 2009-07-29 | 2010-09-15 | 国网电力科学研究院 | Domestic intelligent power distribution terminal |
| CN111009922A (en) * | 2019-12-20 | 2020-04-14 | 宝鸡石油机械有限责任公司 | Management system with heavy-load inquiry and power reduction protection functions and management method |
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| CN112542840B (en) | 2022-08-23 |
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