CN117937525A

CN117937525A - Power distribution method and device suitable for heavy load output

Info

Publication number: CN117937525A
Application number: CN202410323533.7A
Authority: CN
Inventors: 廖尚辉; 陈华; 刘江燕; 李国栋
Original assignee: Fujian Times Nebula Technology Co Ltd
Current assignee: Fujian Times Nebula Technology Co Ltd
Priority date: 2024-03-21
Filing date: 2024-03-21
Publication date: 2024-04-26
Anticipated expiration: 2044-03-21
Also published as: CN117937525B

Abstract

The invention discloses a power distribution method and a device suitable for heavy load output, wherein one of an A phase point, a B phase point and a C phase point corresponding to a load is closed so as to distribute power supply input of all the loads to three phase lines of important load output; if the phase line output by the important load fails, the required power of the load connected with the failed phase line and the residual power of the rest phase lines which do not fail are obtained, and step S3 is executed; and according to the comparison result of the required power and the residual power, disconnecting the load connected with the faulty phase line from the important load output or distributing the load connected with the faulty phase line to other phase lines. When one phase line fails, the invention stops the load of the failure phenomenon or transfers the load to other phase lines according to the required power of the load on the phase line and the residual power of other normal phase lines, thereby more reasonably and flexibly carrying out wiring adjustment and fully utilizing three-phase electric energy.

Description

Power distribution method and device suitable for heavy load output

Technical Field

The invention relates to the technical field of power supply allocation, in particular to a power distribution method and device suitable for outputting heavy loads.

Background

Currently, relatively high power home energy storage devices are connected to the grid and to the important load outputs, mostly three-phase power. The three-phase important load AC output of the household energy storage is usually connected to a three-phase main switch of a distribution box, and the main switch distributes the electric energy to a plurality of single-phase sub-switches, and the single-phase sub-switches are connected with each single-phase load device. In the event of a power outage, these loads will be powered by the home energy storage device.

However, current connections for three-phase, important load ac output often create problems with imbalance in three-phase power distribution. Taking the scheme of fig. 1 as an example, the maximum power of the important load of the home storage system is Ptotal, the important load output of the home storage system is connected to a 3P main switch 1QF of the distribution box, the A-phase output of the main switch 1QF is connected to single-phase switches QF 1-5, the B-phase output of the main switch 1QF is connected to single-phase switches QF 6-10, the C-phase output of the main switch 1QF is connected to single-phase switches QF 11-15, the separate switches QF 1-5 are connected to the sockets of a first floor of a home, QF 6-10 are connected to the sockets of a second floor, and QF 11-15 are connected to the sockets of a third floor. When the power is cut, even if a user uses the electric appliance at one layer, the load power of the electric appliance at the layer cannot exceed 1/3P total, otherwise the electric appliance is overloaded, if the overload time is long, overload protection tripping of a disconnecting switch and even a main switch can be caused, and the three-phase electric energy cannot be fully utilized at the same time; and the total power of the load of a certain phase exceeds one third of the total power of the three phases for a long time, the overload protection of a household storage system or an important load main switch can be caused, and all loads on the ABC three phases are cut off, so that the normal operation of important equipment is influenced.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the power distribution method and the device suitable for the heavy load output are provided, the important load output is reasonably allocated, and three-phase electric energy is more fully utilized.

In order to solve the technical problems, the invention adopts the following technical scheme:

a power distribution method adapted for heavy duty output, comprising the steps of:

S1, closing one of an A phase point, a B phase point and a C phase point corresponding to a load so as to distribute power supply input of all the loads to three phase lines of important load output;

S2, if the phase line output by the important load fails, acquiring the required power of the load connected with the failed phase line and the residual power of the rest phase lines which do not fail, and executing the step S3;

S3, according to a comparison result of the required power and the residual power, disconnecting the load connected with the faulty phase line from the important load output or distributing the load connected with the faulty phase line to other phase lines;

The step S3 specifically includes:

If the required power of the load connected with the faulty phase line is greater than or equal to the residual power of any other phase line which is not faulty, disconnecting the connection of the load connected with the faulty phase line and the important load output;

And if the required power of the load connected with the faulty phase line is smaller than the residual power of at least one other phase line which is not faulty, connecting the load to the other phase line with the maximum residual power.

In order to solve the technical problems, the invention adopts another technical scheme that:

The utility model provides a suitable counter weight is to distribution equipment of load output, includes control panel, inlet wire detection module, current transformer and at least two switching switch spare, the input of inlet wire detection module is connected with important load output electricity, every three independent input of switching switch spare with the three-phase output of inlet wire detection module corresponds the electricity one by one, the public output of switching switch spare passes through current transformer and load electricity is connected, form A phase contact, B phase contact and C phase contact between the public output of switching switch spare and the three independent input respectively;

The control board is respectively and electrically connected with the incoming line detection module, the current transformer and the switching switch piece, and the control board is used for executing the following steps:

S1, closing one of the A phase point, the B phase point and the C phase point corresponding to the load so as to distribute power supply input of all the load to three phase lines of important load output;

The step S3 specifically includes:

The invention has the beneficial effects that: the power distribution method and the device are suitable for heavy load output, an A phase point, a B phase point and a C phase point corresponding to three phase lines are provided for each load connected with important load output, the load is distributed to the three phase lines by selecting one of the phase points when the power distribution device is initially used, when one of the phase lines fails, whether the load with failure phenomenon is stopped or the load is transferred to the other phase lines is determined according to the required power of the load on the phase line and the residual power of other normal phase lines, when the emergency is dealt with, the wiring adjustment can be carried out more reasonably and flexibly, the three-phase electric energy is utilized more fully, and fault tolerance is provided for continuous operation of some important equipment.

Drawings

FIG. 1 is a schematic diagram of a prior art power supply connection for a home energy storage device;

FIG. 2 is a diagram of a prior art home energy storage system architecture;

FIG. 3 is a schematic diagram illustrating steps of a method of power distribution adapted for heavy load output according to the present invention;

FIG. 4 is a flow chart of a method of power distribution suitable for heavy duty output in accordance with the present invention;

FIG. 5 is a schematic diagram of the wiring of a power distribution device adapted for heavy duty output in accordance with the present invention;

FIG. 6 is a schematic diagram of a switching device of a power distribution apparatus adapted for heavy duty output in accordance with the present invention;

Fig. 7 is a schematic diagram of the wiring of the switching elements and control board of a power distribution device adapted to output heavy loads of the present invention.

Description of the reference numerals:

1. a control board; 2. the incoming line detection module; 3. a current transformer; 4. a switching element; 5. a touch screen; 6. a main switch;

1QF, bus switch;

KM1a, A phase contactor; KM1B, B contacts the contactor; KM1C, C contacts the contactor;

QF 1-5 and a separate switch; QF 6-15, a single-phase switch.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 2, the existing home energy storage system architecture generally comprises: two external power supply inputs, namely power grid input and photovoltaic input; the two inputs are used for supplying power to the grid-side load, the important load and the energy storage battery, the grid-side load is not supplied with power when the power grid fails, namely, the operation is stopped, the important load is different, and even if the power grid fails, the important load supplies power by means of the photovoltaic input or the energy storage battery, so that the operation is maintained. The current connection of the important load alternating current output often generates the problem of unbalanced three-phase power distribution. Taking the scheme of fig. 1 as an example, the maximum power of the important load of the home storage system is Ptotal, the important load output of the home storage system is connected to a 3P bus switch 1QF of the distribution box, the A phase output of the bus switch 1QF is connected to single-phase switches QF 1-5, the B phase output of the main switch 1QF is connected to single-phase switches QF 6-10, the C phase output of the main switch 1QF is connected to single-phase switches QF 11-15, the separate switches QF 1-5 are connected to the sockets of a first building of a home, QF 6-10 are connected to the sockets of a second building, and QF 11-15 are connected to the sockets of a third building. When the power is cut, even if a user uses the electric appliance at one layer, the load power of the electric appliance at the layer cannot exceed 1/3P total, otherwise the electric appliance is overloaded, if the overload time is long, overload protection tripping of a disconnecting switch and even a main switch can be caused, and the three-phase electric energy cannot be fully utilized at the same time; and the total power of the load of a certain phase exceeds one third of the total power of the three phases for a long time, the overload protection of a household storage system or an important load main switch can be caused, and all loads on the ABC three phases are cut off, so that the normal operation of important equipment is influenced.

To this end, in connection with fig. 3 and 4, the present application proposes a power distribution method adapted to output a heavy load, comprising the steps of:

And S3, disconnecting the connection between the load connected with the faulty phase line and the important load output or distributing the load connected with the faulty phase line to other phase lines according to the comparison result of the required power and the residual power.

From the above description, the beneficial effects of the invention are as follows: when one of the phase lines fails, whether the load of the failure phenomenon is stopped or transferred to other phase lines is determined according to the required power of the load on the phase line and the residual power of other normal phase lines, and when the emergency is dealt with, wiring adjustment can be carried out more reasonably and flexibly, three-phase electric energy is utilized more fully, and fault tolerance is provided for continuous operation of some important equipment.

Further, the step S2 further includes:

If the fault is an overload of the phase line, the load which can be released from the overload by disconnecting is determined from the overload phase line, and the step S3 is performed on the determined load.

From the above description, when the overload condition of the phase line is faced, the disconnection is determined, so that the overload load of the phase line can be relieved, and further, the determined overload is considered to be deactivated or transferred to other phase lines, so that the three-phase electric energy is utilized to the greatest extent, and the actual electricity demand is met as much as possible.

Further, the step 3 specifically includes:

From the above description, by comparing the required power with the residual power, other phase lines capable of operating the load shifted from the fault phase line are determined, and power is supplied to more loads under the condition that the other phase lines are ensured to operate normally, so that efficient utilization of electric energy is realized.

Further, the step S1 further includes:

Setting a priority for each of the loads;

The step S2 further includes:

And step S3 is performed on each load in turn according to the order of the priority of the loads connected with the faulty phase line.

From the above description, by setting the priority, the power supply problem of an important load can be preferentially processed, so that the power supply adjustment is more reasonable and meets the actual requirement.

Further, the step S1 further includes:

A preset name is set for each of the loads.

As is apparent from the above description, by setting a preset name, it is convenient to identify and manage the power supply of each load.

Referring to fig. 5 to 7, a power distribution device suitable for heavy load output includes a control board 1, an incoming line detection module 2, a current transformer 3 and at least two switching switch elements 4, wherein the input ends of the incoming line detection module 2 are electrically connected with important load output, three independent input ends of each switching switch element 4 are electrically connected with three-phase output ends of the incoming line detection module 2 in a one-to-one correspondence manner, a common output end of the switching switch element 4 is electrically connected with a load through the current transformer 3, and an a phase connection point, a B phase connection point and a C phase connection point are formed between the common output end of the switching switch element 4 and the three independent input ends respectively;

The control board 1 is electrically connected with the incoming line detection module 2, the current transformer 3 and the switching piece 4 respectively, and the control board 1 is used for executing the following steps:

From the above description, the beneficial effects of the invention are as follows: an automatic switching wiring assembly composed of a control board 1, a switching switch piece 4 and the like is configured on an important load output, an A phase point, a B phase point and a C phase point corresponding to three phases are provided for each load connected with the important load output, when the automatic switching wiring assembly is initially used, the load is distributed to the three phases by selecting one of the three phases, when one of the three phases fails, whether the load with the failure phenomenon is stopped or the load with the failure phenomenon is transferred to the other phase line is determined according to the required power of the load on the phase line and the residual power of the other normal phase line, wiring adjustment can be carried out more reasonably and flexibly when the emergency is dealt with, three-phase electric energy is utilized more fully, and fault tolerance is provided for continuous operation of some important equipment.

Further, the step S2 further includes:

Further, the step 3 specifically includes:

Further, the step S1 further includes:

Setting a priority for each of the loads;

The step S2 further includes:

Further, the step S1 further includes:

A preset name is set for each of the loads.

Referring to fig. 3 to 7, a first embodiment of the present invention is as follows:

a method of power distribution adapted for heavy duty output, as shown in fig. 3, comprising the steps of:

S1, setting a priority and a preset name for each load, and closing one of an A phase point, a B phase point and a C phase point corresponding to the load so as to distribute power supply input of all the loads to three phase lines of important load output;

In this embodiment, as shown in fig. 5 and 7, the n loads are named LD1, LD2 … … LDn in order of priority, where the priority of LD1 is the highest and the priority of LDn is the lowest. Each contactor is arranged between each load and ABC of the incoming line main loop, and an A phase contact point, a B phase contact point and a C phase contact point are correspondingly formed, and three contactors between the LD1 and the main loop are named as KM1a, KM1B and KM1C, wherein KM1a is the A phase contactor, KM1B is the B phase contactor and KM1C is the C phase contactor. The contactors corresponding to LD2 are KM2a, KM2b and KM2c, and so on, until the contactors corresponding to LD9 are designated as KM9a, KM9b and KM9c. In automatic switching mode, the system will distribute the 9 load loops equally to A, B, C three phases according to priority: KM1a attraction connects LD1 to phase A, KM2B attraction connects LD2 to phase B, KM3C attraction connects LD3 to phase C, and so on.

S2, if the phase line of the important load output fails, acquiring the required power of the load connected with the failed phase line and the residual power of the rest phase lines which do not fail, and executing step S3 on each load in sequence according to the priority order of the load connected with the failed phase line;

In the present embodiment, if the fault is an overload of the phase line, a load capable of releasing the overload by disconnection is determined from the overloaded phase line, and step S3 is performed on the determined load.

And S3, disconnecting the load connected with the faulty phase line from the important load output or distributing the load connected with the faulty phase line to other phase lines according to the comparison result of the required power and the residual power.

In the present embodiment, in combination with fig. 4 and 5, a load capable of releasing overload by disconnection is determined, and step S3 is performed on the determined load as follows, for example:

If the required power of the load connected with the faulty phase line is greater than or equal to the residual power of any other phase line which is not faulty, disconnecting the connection between the load connected with the faulty phase line and the important load output; and if the required power of the load connected with the faulty phase line is smaller than the residual power of at least one other phase line which is not faulty, connecting the load to the other phase line with the maximum residual power.

In normal operation, ABC three phases are not overloaded, and the device is not automatically switched at the moment. If during operation, the load of one phase increases to overload the phase, the system automatically switches. Taking overload of phase a as an example, the rated power of phase a of the power distribution device is named PA rating. Subtracting the equivalent pre-load power of B from the rated power of B, and designating the rest power as PB rest; similarly, the remaining power of phase C is designated as PC remaining. The power of the load loop LD1 is named as PLD1, the power of the load LD4 is named as PLD4, and the power of the load LD7 is named as PLD7. When phase a is overloaded, i.e., pld1+pld4+pld7 > PA nominal:

If phase A is no longer overloaded by removing LD7, i.e., PLD1+PLD4 < PA rating, phase A will leave LD1, LD4, cut LD7 onto other phases or disconnect LD7. The system compares the magnitudes of the PLD7, the PB residual power and the PC residual power. If PLD7 is at a maximum, at this time, neither B phase nor C phase will accept input of LD7, the system will disconnect contactor KM7a, disconnecting LD7 loop from main loop; if PB residual power is maximum, the system firstly opens the contactor KM7a, then closes the contactor KM7B, and switches the LD7 load loop from the phase A to the phase B; if the PC residual power is maximum, the system will open contactor KM7a first and then close contactor KM7C to switch the LD7 load loop from phase a to phase C.

If phase a is still overloaded by removing LD7, LD4 and LD7 need to be removed, i.e., pld1+pld4 > PA rating, PLD1 < PA rating, then phase a will only remain LD1, cut LD4 and LD7 to other phases or directly disconnect LD4, LD7. The system compares the magnitude relation among the PLD4, the PLD7, the PB residual power and the PC residual power, and has the following cases:

1. If PLD4 is greater than either PB or PC, the system will open contactor KM4a, disconnecting LD4 loop from the main loop. After cutting off LD 4: if PLD7 is greater than either PB or PC, then the system will then open contactor KM7a, disconnecting the LD7 loop from the system; if PLD7 is smaller than one of PB and PC but larger than the other, the system will first open contactor KM7a and then close contactor KM7 (in this case "×" is the one of B-phase and C-phase that is larger than LD 7); if PLD7 is smaller than both PB and PC, the system will open contactor KM7a first and then close contactor KM7 (in this case "×" is the phase with the greater remaining power in phase B and phase C).

2. If PLD4 is greater than one of the phases PB and PC and less than the other, the system will open contactor KM4a, disconnect the LD4 loop from the main loop, then pull in contactor KM4 (in this case, "×" is the phase of B and C phases that has greater power than LD 4) and phase LD7 loop is switched from a to the phase of BC that has greater power. After the LD4 is switched: if B, C both phases have less residual power than PLD7, then the system will open contactor KM7a, disconnecting the LD7 loop from the main loop; if B, C has more power remaining in the two phases than PLD7, the system opens contactor KM7a and then pulls contactor KM7 in (in this case "×" is the phase with the greater power remaining in the B and C phases).

3. If PLD4 is smaller than PB and PC, the system opens contactor KM4a, disconnects LD4 from the main circuit, and then pulls in contactor KM4 (in this case, ", the larger of the B-phase and C-phase residual powers). After LD4 is switched, if B, C two phases of residual power are smaller than PLD7, the system opens contactor KM7a to disconnect LD7 loop from main loop; if B, C has more power remaining in the two phases than PLD7, the system opens contactor KM7a and then pulls contactor KM7 in (in this case "×" is the phase with the greater power remaining in the B and C phases).

Referring to fig. 4 to 6, a second embodiment of the present invention is as follows:

The utility model provides a suitable counter weight is to distribution equipment of load output, including master switch 6, control panel 1, inlet wire detection module 2, current transformer 3 and at least two switching switch piece 4, the input of inlet wire detection module 2 is connected with important load output electricity through master switch 6, the three independent input of every switching switch piece 4 is connected with the three-phase output of inlet wire detection module 2 one-to-one electricity, the public output of switching switch piece 4 is connected with the load electricity through current transformer 3, form A phase contact, B phase contact and C phase contact between the public output of switching switch piece 4 and the three independent input respectively; the control board 1 is electrically connected with the incoming line detection module 2, the current transformer 3 and the switching switch member 4, respectively, and is used for executing a power distribution method suitable for outputting heavy loads in the first embodiment.

Three contactors are specifically used as the a-phase contact, the B-phase contact, and the C-phase contact in the switching element 4. The coil of any one contactor of the three contactors is matched with the auxiliary contacts of the other two contactors to realize electric interlocking, and at most, only the main contact of one contactor of the three contactors can be attracted. The coils of the contactor are controlled by the control board 1 as shown in fig. 6: "KZB: KM1a+ "," KZB: KM1b+ "," KZB: KM1c+ "are connected to three control anodes of the control board 1, respectively," KZB: KM- "is connected to the control negative electrode of the control board 1.

In this embodiment, as shown in fig. 5 and 6, a composition of a power distribution apparatus adapted to output a heavy load is described as follows:

the main switch 6: and the input end of the main incoming line access part of the power distribution device is connected with an important load output ABCN three-phase four-wire provided by a household storage, the output end of the main incoming line access part is connected with the input end of the power distribution unit, and the main switch 6 can use a breaker with proper current-carrying capacity.

Switching element 4, control board 1 and current transformer 3: the core components of the power distribution device realize the allocation of ABC three-phase energy by switching the line, and can also realize the protection of loads according to the priority. The output of the switching switch piece 4 is connected to a load which a user wants to intelligently regulate, the control board 1 and the current transformer 3 are matched to read the voltage and current information of the three phases of the total incoming line loop ABC, the current information of the n-branch loop can be read, the on-off of n contactors of the box 3 can be controlled, and the control board is communicated with a display screen. The control board 1 can be matched with the switching switch piece 4 to set rated power of each phase of the total loop as the basis of protection and switching. The critical load output may be consistent with the critical load output power if the critical load outputs are all connected to the power distribution device. If a portion of the load does not pass through the distribution device, the power set needs to be considered to subtract the portion of the load power.

The ABCN three-phase four-wire entering from the main switch 6 firstly passes through the incoming line detection module 2, the current transformer 3 and voltage sampling are arranged in the incoming line detection module 2, the voltage and current information of the ABC three-phase of the main loop can be collected and transmitted to the control board 1, the voltage and current of the ABC three-phase of the main incoming line output to the power distribution device by the household storage system are detected, and the system can calculate the power of each phase of the ABC main loop according to the voltage and current information. After passing through the incoming line detection module 2, each phase of the three phases ABC is divided into n loops, which are 3n single-phase loops. The 3n loops are connected to the main contact inlet ends of the 3n contactors respectively in sequence of ABC. The main contact input ends of every three adjacent contactors (the main contact input ends of the three contactors are respectively connected with ABC three phases), namely the common output end of the switching switch piece 4, are connected to n external loads through n current transformers 3. The 3n contactors are controlled by the control board 1, and at most only one of every three adjacent main contactors is closed, and two or three main contactors are not closed at the same time. The n loops connected to the load are all provided with current transformers 3 for collecting current, and can collect current information of the sub-loops and transmit the current information to the control board 1. Each of the 3N single-phase loops is connected to an external load along with N lines and L lines passing through the contactor.

Touch screen 5: the display screen communicates with the control panel 1 in real time, and the functions are rich: through the display screen, the names of all paths of the n loops appearing in the power distribution unit can be edited in a self-defining mode; the priority of each loop can be set by a display screen; the display screen can also display the current state of each loop contactor, and visually display whether each loop is connected or not; the corresponding current and power of each loop can be seen; the contactor of a certain loop can be manually turned off or on through the display screen.

In summary, the present invention provides a power distribution method and apparatus suitable for heavy load output, which sets a priority for each load connected to an important load output and provides an a phase point, a B phase point and a C phase point corresponding to three phase lines, when the power distribution method and apparatus are initially used, the load is distributed to the three phase lines by selecting one of the points, when one of the phase lines fails, according to the required power of the load on the phase line, the remaining power of other normal phase lines and the priority order, it is determined whether to deactivate the load of the failure phenomenon or transfer the load to the other phase lines, when the emergency is dealt with, the wiring adjustment can be performed more reasonably and flexibly, and three-phase electric energy is utilized more fully, so that fault tolerance is provided for continuous operation of some important devices.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.

Claims

1. A power distribution method suitable for outputting heavy loads, comprising the steps of:

S3, according to the comparison result of the required power and the residual power, disconnecting the load connected with the faulty phase line from the important load output, or distributing the load connected with the faulty phase line to the rest phase lines which are not faulty;

The step S3 specifically includes:

2. The method for power distribution adapted to output a heavy load according to claim 1, wherein said step S2 further comprises:

3. The method for power distribution adapted to output of a heavy load according to claim 1, wherein said step S1 further comprises:

Setting a priority for each of the loads;

The step S2 further includes:

4. The method for power distribution adapted to output of a heavy load according to claim 1, wherein said step S1 further comprises:

A preset name is set for each of the loads.

5. The utility model provides a suitable counter weight is to distribution equipment of load output, its characterized in that includes control panel, inlet wire detection module, current transformer and at least two switching switch spare, the input of inlet wire detection module is connected with important load output electricity, and every three independent input of switching switch spare and the three-phase output of inlet wire detection module correspond the electricity one by one, the public output of switching switch spare passes through current transformer and load electricity connection, form A phase contact, B phase contact and C phase contact between the public output of switching switch spare and the three independent input respectively;

the step3 specifically includes:

6. The power distribution apparatus adapted for outputting a heavy load according to claim 5, wherein said step S2 further comprises:

7. The power distribution apparatus adapted for outputting a heavy load according to claim 5, wherein said step S1 further comprises:

Setting a priority for each of the loads;

The step S2 further includes:

8. The power distribution apparatus adapted for outputting a heavy load according to claim 5, wherein said step S1 further comprises:

A preset name is set for each of the loads.