Flexible power load regulation and control method and system for coal-to-electricity initial stage power supply area

Abstract

The invention discloses a flexible power load regulation and control method and system for a coal-to-electricity initial stage power supply area. The regulation and control method comprises the steps that the number and power of phase lines connected to all heating devices in a power supply area are collected; according to the matching degree of the number of the phase lines connected to the heating devices and the power, all the heating devices are distributed to a priority regulation and control queue and a common regulation and control queue; registering the switching-on and switching-off state of each heating device; when the overload risk of a transformer is analyzed according to the power of all the heating devices in the power supply area, phase line opening of the heating devices in the priority regulation and control queue is executed firstly, and then phase line opening of the heating devices in the common regulation and control queue is executed. According to the invention, by dynamically adjusting the switching-in or switching-out of the phase lines of the heating equipment in the power supply area, the overall power control of the transformer can be realized, so that the purpose of suppressing the power overload of the transformer is achieved.

Description

Technical Field

[0001] The present invention relates to the field of power control, and in particular to a method and system for flexible power load control in an initial power supply area during coal-to-electricity conversion. Background Art

[0002] In areas where coal is used for heating, in order to save energy, reduce emissions and improve the environment, power grid companies actively cooperate with local governments to carry out heating measures transformation and encourage local users to upgrade coal-to-electricity facilities, that is, abandon traditional coal-burning heating methods and adopt advanced electric heating methods.

[0003] In the early stage of the implementation of coal-to-electricity conversion, some areas were unable to provide independent power supply to households in the area due to imperfect supporting facilities. The power supply for electric heating equipment had to be obtained through a transformer responsible for the entire area. During the peak period of electric heating, the transformer would be loaded with heating equipment of multiple households at the same time, and even overloaded. The transformer would be easily damaged if it was operated at high load or even overloaded for a long time, affecting the safety of electricity use of the people in the area.

[0004] How to intelligently control the heating equipment of each household in the region without affecting the basic operation of the heating equipment and avoid problems such as transformer overload will be the key research technology in the initial stage of coal-to-electricity implementation. Summary of the invention

[0005] Based on this, the first aspect of an embodiment of the present invention discloses a method for flexible power load control in an initial power supply area during coal-to-electricity conversion.

[0006] The control method comprises:

[0007] Collect the number and power of phase lines connected to all heating equipment in a power supply area;

[0008] Allocate all heating devices to a priority control queue and a common control queue according to the matching degree between the number of phase lines connected to the heating devices and the power;

[0009] Registering the on / off status of each heating device;

[0010] When there is a risk of transformer overload according to the power analysis of all heating equipment in the power supply area, the phase lines of the heating equipment in the priority control queue are disconnected first, and then the phase lines of the heating equipment in the ordinary control queue are disconnected.

[0011] Among them, in the embodiments disclosed in the present invention,

[0012] Allocating the heating equipment to the priority control queue or the common control queue according to the matching degree includes:

[0013] A normal power range is obtained according to the number of phase lines connected to the heating device;

[0014] When the power of the heating device does not belong to the normal power range, the heating device is assigned to the priority control queue.

[0015] When the power of the heating device belongs to the normal power range, the heating device is allocated to the common control queue.

[0016] Among them, in the embodiments disclosed in the present invention,

[0017] The number of phase lines connected to the heating device is positively correlated with the range of the normal power interval, and the normal power intervals corresponding to different numbers of phase lines do not alternate.

[0018] Among them, in the embodiments disclosed in the present invention

[0019] Analysis of the transformer overload risks includes:

[0020] The power collected from all heating equipment in the power supply area is the total collected power.

[0021] When the total collected power is greater than or equal to a product of a rated power and an overload factor, it is analyzed that there is an overload risk for the transformer.

[0022] Among them, in the embodiments disclosed in the present invention,

[0023] Executing the phase line disconnection of the heating equipment in the priority control queue includes:

[0024] Find the heating device having a shuntable phase line in the priority control queue, wherein the number of shuntable phase lines of the heating device is greater than 1;

[0025] Controlling an intelligent circuit breaker to disconnect one phase of the heating device;

[0026] After disconnection, all heating devices are reallocated to the priority control queue and the common control queue, and the heating devices with disconnectable phase lines in the priority control queue are searched again.

[0027] Among them, in the embodiments disclosed in the present invention,

[0028] Look for the heating equipment included,

[0029] Sort one or more heating devices in the priority control queue according to the average power of the phase line;

[0030] All heating devices in the priority control queue are traversed starting from the table header, and the first heating device that can be opened is traversed according to the opening and closing status.

[0031] Among them, in the embodiments disclosed in the present invention,

[0032] Executing the phase line disconnection of the heating equipment in the common control queue includes:

[0033] When no traversal is performed to obtain the heating equipment that can be disconnected in the priority control queue,

[0034] Find the heating device having a shuntable phase line in the common control queue, wherein the number of shuntable phase lines of the heating device is greater than 1;

[0035] Controlling an intelligent circuit breaker to disconnect one phase of the heating device;

[0036] After disconnection, search again for the heating equipment with a disconnectable phase line in the priority control queue.

[0037] Among them, in the embodiments disclosed in the present invention,

[0038] The control method comprises:

[0039] According to the power analysis of all heating equipment in the power supply area, when there is surplus transformer,

[0040] First, the phase line of one or more heating devices in the common control queue is closed.

[0041] Then, the phase lines of one or more heating devices in the priority control queue are closed.

[0042] Among them, in the embodiments disclosed in the present invention

[0043] Executing the phase line closing of one or more heating devices in the common control queue or the priority control queue includes:

[0044] The phase lines of one or more heating devices are closed according to the opening time sequence of the heating devices.

[0045] And, in a second aspect of an embodiment of the present invention, a flexible power load control system for an initial power supply area in a coal-to-electricity conversion is disclosed.

[0046] The control system includes a power collection module, a queue allocation module, a status registration module and a switch opening and closing module;

[0047] The power collection module is used to collect the number and power of phase lines connected to all heating equipment in a power supply area;

[0048] The queue allocation module is used to allocate all heating devices to a priority control queue and a common control queue according to the matching degree between the number of phase lines connected to the heating devices and the power;

[0049] The state registration module is used to register the opening and closing state of each heating device;

[0050] The opening and closing module is used to first open the phase lines of the heating equipment in the priority control queue and then open the phase lines of the heating equipment in the ordinary control queue when there is a risk of transformer overload based on the power analysis of all heating equipment in the power supply area.

[0051] Compared with the prior art, the embodiments of the present invention can control the overall power of the transformer by flexibly and dynamically adjusting the phase line switching in or out of the heating equipment of each household user in the power supply area, so as to achieve the purpose of suppressing transformer power overload.

[0052] In view of the above-mentioned solutions, the present invention will describe the disclosed exemplary embodiments in detail below with reference to the accompanying drawings, so as to make other features and advantages of the embodiments of the present invention clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 A flow chart showing the flexible power load control method for power supply areas in the initial stage of coal-to-electricity conversion is shown.

[0055] Figure 2 A flow chart showing the flexible power load control method for power supply areas in the initial stage of coal-to-electricity conversion is shown.

[0056] Figure 3 The schematic diagram of the structure of the flexible power load control system in the power supply area in the initial stage of coal-to-electricity conversion is shown. DETAILED DESCRIPTION

[0057] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0059] The embodiment of the present invention discloses a flexible power load control method for power supply areas in the initial stage of coal-to-electricity conversion. The control method is applied to power supply areas that have not yet completed the electric heating conversion.

[0060] The power supply area is in the early stage of coal-to-electricity conversion. The power supply area includes a transformer, multiple heating devices deployed at household users and intelligent circuit breakers. The heating device is independent of the household power line and is connected to three-phase electricity. The intelligent circuit breaker can realize the switching in or out of any phase line of the three-phase electricity in the heating device. The power of the heating device is controlled by the household user. The power threshold of the heating device is linearly positively correlated with the number of phase lines connected to the three-phase electricity, that is, when the number of phase lines connected to the heating device is more, the power upper limit that the heating device can reach is higher, and the heating effect is more obvious. In order to ensure the normal operation of the intelligent circuit breaker itself, the heating device at least maintains access to any one phase line. The power supply of the heating device of each household user in the power supply area is supported by its transformer, and the intelligent circuit breaker controls the phase line of the heating device by a host computer deployed at a remote end. At the same time, the host computer collects the current power of the heating device (or the sensor, instrument, etc. of the heating device itself) through sensors and instruments (such as electric meters, etc.).

[0061] The control method can realize the control of the overall power of the transformer by flexibly and dynamically adjusting the phase line switching in or out of the heating equipment of each household user in the power supply area, so as to achieve the purpose of suppressing the power overload of the transformer.

[0062] Figure 1 A flow chart showing the flexible power load control method for power supply areas in the initial stage of coal-to-electricity conversion is shown.

[0063] Figure 1 It is shown that the control method includes steps 10 to 50.

[0064] 10 The host computer collects the number of phase lines connected to the heating equipment of all household users in the power supply area.

[0065] Among them, the host computer can determine the power threshold of each heating device according to the number of connected phase lines.

[0066] Among them, the number of phase lines connected to the heating equipment is positively correlated with the power threshold.

[0067] For example, Pmax=MP, where Pmax is a power threshold, M is the number of phase lines, and P is a constant representing unit power.

[0068] 20 The host computer collects the power of heating equipment of all household users in the power supply area.

[0069] The host computer collects the current power of the heating device through sensors, meters, and other devices connected to the line, or sensors and meters built into the heating device. The power of the heating device is related to the heating effect and can be adjusted by the user in real time. The power of the heating device is always less than or equal to the power threshold.

[0070] 30 The host computer allocates all heating devices to a priority control queue and a common control queue according to the matching degree between the number of phase lines connected to the heating devices and the power.

[0071] Among them, allocating queues according to the matching degree means that the upper computer analyzes the heating equipment of a household user, determines its normal power range according to the number of phase lines connected to the heating equipment, and then compares the current power of the heating equipment with the normal power range. When the current power is not in the normal power range, it is considered that the phase line access of the household user is redundant, and the household user is allocated to the priority control queue. When the current power is in the normal power range, it is considered that the phase line access of the household user is not redundant, and the household user is allocated to the ordinary control queue.

[0072] Preferably, the normal power interval refers to a power interval that matches the current number of phase lines.

[0073] For example, when the number of connected phase lines is 1, the normal power range is 0 to P; when the number of connected phase lines is 2, the normal power range is P to 2P; when the number of connected phase lines is 3, the normal power range is 2P to 3P.

[0074] 40 The host computer registers the on / off status of the heating equipment in the priority control queue and the ordinary control queue.

[0075] Among them, the opening and closing status refers to the number of phase lines that can be opened and closed for the heating equipment.

[0076] For example, when the number of connected phase lines is equal to 2, the heating device can be opened or closed, and the number of phase lines that can be opened and closed is 1.

[0077] For example, when the number of connected phase lines is equal to 3, the heating device can only be disconnected, and the number of phase lines that can be disconnected is 2.

[0078] 50 The upper computer determines whether the total power of the current transformer has an overload risk based on the power of all heating equipment. When it is found that the current transformer has an overload risk, it first disconnects the phase lines of one or more heating equipment in the priority control queue, and then disconnects the phase lines of one or more heating equipment in the common control queue.

[0079] The overload risk refers to the total collected power of all heating equipment collected by the host computer. When the total collected power is greater than or equal to the rated power multiplied by an overload coefficient, the host computer analyzes and believes that the total collected power has an overload risk. The overload coefficient is preferably 0.8.

[0080] Among them, executing the phase line disconnection of the heating equipment in the priority control queue means finding one or more heating equipment in the priority control queue that can be disconnected, and the number of disconnectable phase lines of the heating equipment found must be greater than 1.

[0081] Among them, searching for one or more heating devices in the priority control queue means that the host computer first sorts the heating devices in the priority control queue according to the average power of the phase line. Among them, the average power of the phase line means that the host computer divides the power of the heating device by the three-phase line of the heating device (regardless of whether each phase line is connected to the heating device) to obtain the average power of each phase line. The host computer then traverses the heating devices that can be disconnected in the priority control queue from the table header, and disconnects the 1-phase line of the traversed heating device according to the first disconnectable heating device in the list obtained by traversing the registered disconnection and closing status, wherein the heating device must ensure that there is still at least 1 phase line after disconnection. After the host computer disconnects one heating device, it will reallocate all heating devices to the priority control queue and the ordinary control queue. The host computer reorders the reallocated priority control queue according to the average power of the phase line, and retraverses the priority control queue until there is no heating device that can be disconnected in the priority control queue.

[0082] Among them, disconnecting the heating equipment means that the upper computer controls the intelligent circuit breaker so that the intelligent circuit breaker cuts off the phase line connected to the heating equipment.

[0083] Then, after one phase line of a heating device in the priority control queue is disconnected, the heating device may be in two states: one is that the number of phase lines connected to the heating device matches the normal power range, and the heating device will be reallocated to the ordinary control queue; the other is that the number of phase lines connected to the heating device still does not match the normal power range, and the heating device will be retained in the priority control queue. When the heating device is retained in the priority control queue, the priority control queue will be reordered according to the average power of the phase line, and the heating device that can be disconnected will continue to be traversed from the head of the queue, or the total collected power will not be overloaded. Risk.

[0084] Among them, executing the disconnection of the phase lines of the heating equipment in one or more ordinary control queues means that when all the heating equipment in the priority control queue has no disconnectable phase lines, the host computer starts to execute the disconnection of the heating equipment in the normal control queue. Specifically, the host computer traverses the disconnectable heating equipment in the ordinary control queue from the table header, and disconnects the 1-phase line of the traversed heating equipment according to the first disconnectable heating equipment in the list obtained by traversing the registered opening and closing status, wherein the heating equipment must ensure that there is at least 1 phase line after disconnection. After the host computer disconnects one heating equipment, it re-sorts the ordinary control queue according to the average power of the phase line, and re-traverses the ordinary control queue until there is no disconnectable heating equipment in the ordinary control queue, or there is no risk of overload of the total collected power.

[0085] Preferably, when there is a risk of overload in the total collected power and there is no shuntable heating equipment in the priority control queue and the ordinary control queue, the host computer sends an external alarm.

[0086] Then, each time the phase line connected to the heating equipment in the ordinary control queue is cut off, the order of the ordinary control queue will be changed again, so that the heating equipment with relatively high power after the change will be arranged in front of the queue, and will be the first heating equipment to participate in the control in the next ordinary control queue, so as to achieve the purpose of reducing the high power of the heating equipment in the ordinary control queue.

[0087] Based on this, the control method of this embodiment first cuts out the redundant phase lines of the heating equipment in the priority control queue. At this time, the power of the heating equipment will not change significantly due to the cutting out of the redundant phase lines; then the access phase lines of the heating equipment with relatively high power (that is, the average power of the phase lines is high) in the ordinary control queue are cut out. At this time, the power of the heating equipment will decrease due to the reduction of the power threshold, and the heating effect of the heating equipment will be reduced from the current heating effect to the heating effect corresponding to the power threshold when 1 phase line is reduced.

[0088] In summary, the control method realizes the overall power control of the transformer by dynamically adjusting the phase line of the heating equipment of each household user in the power supply area, so as to achieve the purpose of allocating the surplus power of the transformer.

[0089] Figure 2 A flow chart showing the flexible power load control method for power supply areas in the initial stage of coal-to-electricity conversion is shown.

[0090] Figure 2 It is shown that the control method further includes step 60 .

[0091] 60 The upper computer determines whether the total power of the current transformer is surplus according to the power of all heating devices. When it is found that the current transformer is surplus, the phase line of one or more heating devices is closed.

[0092] The power surplus means that the power collected from all heating devices is the total collected power. When the rated power multiplied by a surplus coefficient is greater than or equal to the total collected power, the total collected power is considered to be surplus. The surplus coefficient is preferably 0.8.

[0093] Among them, closing the phase line of one or more heating devices means that according to the opening time of the access phase line of each heating device recorded in step 50, one or more heating devices in the ordinary control queue are first selected according to the opening time to close, and when there is no heating device to be closed in the ordinary control queue, one or more heating devices in the priority control queue are selected according to the opening time to close and return to step 10.

[0094] Preferably, a maximum of 4 heating devices are selected for closing each time.

[0095] Among them, closing the heating equipment means that the upper computer controls the intelligent circuit breaker to make the intelligent circuit breaker cut into the phase line that is not connected to the heating equipment.

[0096] Based on this, the control method of this embodiment first closes the heating equipment in the common control queue according to the opening time. If the user has not previously increased or maintained the power of the heating equipment, the power of the heating equipment will recover after the phase line is closed, and the heating effect will also recover; if the user controls the power of the heating equipment to decrease, the power of the heating equipment will remain unchanged after the phase line is closed, and the heating effect will also remain unchanged. Then, according to the opening time, the heating equipment in the priority control queue will be closed. At this time, after the phase line is closed, the power of the heating equipment will remain unchanged, and the heating effect will also remain unchanged.

[0097] In summary, the control method described in this embodiment can achieve the control of the overall power of the transformer through flexibly and dynamically adjusting the phase line cutting in or out of the heating equipment of each household user in the power supply area, so as to achieve the purpose of suppressing the power overload of the transformer; secondly, it can achieve the purpose of allocating the surplus power of the transformer.

[0098] This embodiment discloses a flexible power load control system for power supply areas in the initial stage of coal-to-electricity conversion.

[0099] Figure 3 The schematic diagram of the structure of the flexible power load control system in the power supply area in the initial stage of coal-to-electricity conversion is shown.

[0100] Figure 3It is shown that the control system execution includes a power collection module, a queue allocation module, a state registration module and an opening and closing module. The power collection module is used to collect the number and power of the phase lines connected to all heating equipment in a power supply area. The queue allocation module is used to allocate all heating equipment to a priority control queue and a common control queue according to the matching degree of the number of phase lines connected to the heating equipment and the power. The state registration module is used to register the opening and closing status of each heating equipment. The opening and closing module is used to perform the phase line opening of the heating equipment in the priority control queue first, and then the phase line opening of the heating equipment in the common control queue when there is a risk of overload of the transformer according to the power analysis of all heating equipment in the power supply area; when there is a surplus of transformers according to the power analysis of all heating equipment in the power supply area, the phase line closing of the heating equipment in the common control queue is performed first, and then the phase line closing of the heating equipment in the priority control queue is performed.

[0101] Based on this understanding, the technical solution of the present invention can essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0102] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for flexible power load control in the initial stage of coal-to-electricity power supply area, characterized in that: The control method comprises: Collect the number and power of phase lines connected to all heating equipment in a power supply area; Allocate all heating devices to a priority control queue and a common control queue according to the matching degree between the number of phase lines connected to the heating devices and the power; Registering the on / off status of each heating device; When there is a risk of transformer overload according to the power analysis of all heating equipment in the power supply area, the phase lines of the heating equipment in the priority control queue are disconnected first, and then the phase lines of the heating equipment in the ordinary control queue are disconnected.

2. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 1 is characterized in that: Allocating the heating equipment to the priority control queue or the common control queue according to the matching degree includes: A normal power range is obtained according to the number of phase lines connected to the heating device; When the power of the heating device does not belong to the normal power range, the heating device is assigned to the priority control queue. When the power of the heating device belongs to the normal power range, the heating device is allocated to the common control queue.

3. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 2 is characterized in that: The number of phase lines connected to the heating device is positively correlated with the range of the normal power interval, and the normal power intervals corresponding to different numbers of phase lines do not alternate.

4. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 1 is characterized in that: Analysis of the transformer overload risks includes: The power collected from all heating equipment in the power supply area is the total collected power. When the total collected power is greater than or equal to a product of a rated power and an overload factor, it is analyzed that there is an overload risk for the transformer.

5. The method for flexible power load control in the initial stage of coal-to-electricity power supply area according to claim 1 is characterized in that: Executing the phase line disconnection of the heating equipment in the priority control queue includes: Find the heating device having a shuntable phase line in the priority control queue, wherein the number of shuntable phase lines of the heating device is greater than 1; Controlling an intelligent circuit breaker to disconnect one phase of the heating device; After disconnection, all heating devices are reallocated to the priority control queue and the common control queue, and the heating devices with disconnectable phase lines in the priority control queue are searched again.

6. The method for flexible power load control in the initial stage of coal-to-electricity power supply area according to claim 5 is characterized in that: Look for the heating equipment included, Sort one or more heating devices in the priority control queue according to the average power of the phase line; All heating devices in the priority control queue are traversed starting from the table header, and the first heating device that can be opened is traversed according to the opening and closing status.

7. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 5 is characterized in that: Executing the phase line disconnection of the heating equipment in the common control queue includes: When no traversal is performed to obtain the heating equipment that can be disconnected in the priority control queue, Find the heating device having a shuntable phase line in the common control queue, wherein the number of shuntable phase lines of the heating device is greater than 1; Controlling an intelligent circuit breaker to disconnect one phase of the heating device; After disconnection, search again for the heating equipment with a disconnectable phase line in the priority control queue.

8. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 1 is characterized in that: The control method comprises: According to the power analysis of all heating equipment in the power supply area, when there is surplus transformer, First, the phase line of one or more heating devices in the common control queue is closed, and then the phase line of one or more heating devices in the priority control queue is closed.

9. The method for controlling the flexible power load in the initial stage of coal-to-electricity power supply area according to claim 8 is characterized in that: Executing the phase line closing of one or more heating devices in the common control queue or the priority control queue includes: The phase lines of one or more heating devices are closed according to the opening time sequence of the heating devices.

10. A flexible power load control system for the initial power supply area of ​​coal-to-electricity conversion, characterized in that: The control system includes a power collection module, a queue allocation module, a status registration module and a switch opening and closing module; The power collection module is used to collect the number and power of phase lines connected to all heating equipment in a power supply area; The queue allocation module is used to allocate all heating devices to a priority control queue and a common control queue according to the matching degree between the number of phase lines connected to the heating devices and the power; The state registration module is used to register the opening and closing state of each heating device; The opening and closing module is used to first open the phase lines of the heating equipment in the priority control queue and then open the phase lines of the heating equipment in the ordinary control queue when there is a risk of transformer overload based on the power analysis of all heating equipment in the power supply area.

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