CN216904423U - Load power active regulation system based on alternating current power grid power line carrier - Google Patents

Abstract

The utility model relates to a load power active regulation system based on an alternating current power grid power line carrier. The transmitting device broadcasts a high-frequency carrier signal with continuously variable frequency within a certain appointed frequency range to a power grid of a target area through a power line carrier technology according to the real-time scheduling requirement of a power system; the high-frequency carrier signal is transmitted to all user side loads in the target area through the transmission line, and various user side loads actively adjust power according to the high-frequency carrier signal and self power consumption requirements. Based on the existing alternating current power grid, the power dispatching instruction signal is broadcasted to the power grid of the target area in real time through the power line carrier technology, and the power demand response covering power grid connection users can be conveniently realized.

Description

Load power active regulation system based on alternating current power grid power line carrier

Technical Field

The utility model relates to a load power active regulation system based on an alternating current network power line carrier, and relates to the technical field of power systems.

Background

To cope with global climate change, reducing carbon emissions has become a key task for human sustainable development. The development of renewable energy-based zero-carbon power systems is the fundamental path to achieve the "carbon neutralization" goal. Due to the intermittent and stochastic nature of renewable energy power generation, the importance of power demand-side management is becoming increasingly prominent. The method effectively transfers the user side to participate in the peak and frequency regulation of the power grid, and provides guarantee for the safe and stable operation of the power system to a great extent. At present, the country incorporates demand response into regional power planning, so as to maximally mine the flexible regulation resources for power utilization on the user side.

The building is a main component of urban power load and has huge power utilization flexibility potential. As distributed power generation equipment (such as photovoltaic, wind power generators, etc.) and distributed energy storage equipment (such as storage batteries, electric vehicles, charging piles, energy storage air conditioning systems, etc.) are gradually combined with buildings, the instantaneous power supplied by an external power grid required by the buildings can be allowed to be adjusted within a wide range. Meanwhile, with the gradual change of various electrical appliances, equipment, systems and the like in the building to the direction of digitalization and intellectualization, the intelligent power supply device has the capability of actively adjusting the power consumption according to external input parameters.

Many practical cases of power demand response exist at home and abroad, but a mature and large-scale user-power grid interaction mode is not formed at present. Various terminal users are numerous and wide in coverage, and although a single user has limited adjusting capacity, the flexible energy utilization potential is great after the number of the users is small and large. How to use a convenient and low-cost technical means to increase the number of users participating in demand response is the key of the problem. The current power demand response case is mainly based on an electricity price mechanism (namely time-of-use electricity price), but empirical research shows that the response characteristic of a user to the electricity price is very complex, phenomena such as delay, randomness and the like which violate an economic elasticity theory exist, and the differences are large at different time and regions. If accurate demand response adjustment is required to be performed completely based on the electricity price mechanism, extremely high requirements are provided for various links of collection, transmission, storage, modeling, analysis and the like of massive user electricity utilization data, and the technical difficulty and cost of demand response are greatly improved.

In summary, the existing demand response method mainly relying on time-of-use electricity prices fails to effectively mine the flexible adjustment capability of the user, and is mainly limited by the complexity of the system and the participation degree of the user. The key problem is how to effectively and conveniently broadcast the power dispatching requirement changing in real time to all users connected with the power grid, so that the users can participate in adjustment.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, an object of the present invention is to provide an active load power adjustment system based on ac power grid power line carriers, which is suitable for ac power systems with different device configurations and different system scales, and can transmit continuously varying power scheduling signals to all loads connected to a power grid, thereby conveniently achieving power demand response covering users connected to the power grid.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a load power active regulation system based on an alternating current power grid power line carrier, which comprises a sending device, a transmission line and a load;

the transmitting device broadcasts a high-frequency carrier signal to a power grid of a target area through a power line carrier technology according to the real-time scheduling requirement of the power system;

the high-frequency carrier signal is sent to the loads of all user sides in the target area through the transmission line;

and the load actively adjusts the power according to the high-frequency carrier signal and the self power demand.

Further, the transmitting device is arranged in a substation or a distribution room of any voltage class in the power system.

Further, the transmitting device comprises a signal processor, a power carrier machine, a filtering device and a wave trap;

the signal processor can receive a power scheduling instruction and send the instruction to the power carrier machine;

the power carrier machine can modulate the signal into a high-frequency carrier signal with the frequency continuously variable within a certain appointed frequency range;

the filtering device can couple the high-frequency carrier signal into a main network power line and prevent power frequency alternating current in the main network power line from reversely entering the power carrier machine;

the wave trap can ensure that the high-frequency carrier signal is only broadcast to all loads of a target power grid parcel.

Further, if the transmission line comprises a transformer, a relay device is correspondingly arranged, and the relay device is connected with the transformer in parallel, so that the cross-transformer transmission of the high-frequency carrier signal can be realized.

Further, the load comprises an alternating current load connected directly and/or a direct current load connected through an alternating current-direct current converter;

the alternating current load comprises a receiver and a controller of a high-frequency carrier signal, wherein the receiver is used for decoupling the high-frequency carrier signal from input alternating current and inputting the high-frequency carrier signal into the controller for load power regulation;

the direct-current load is a direct-current microgrid with a receiver and an alternating-current-direct-current converter, and the receiver decouples a high-frequency carrier signal from input alternating current and inputs the high-frequency carrier signal into the alternating-current-direct-current converter for load power regulation.

Due to the adoption of the technical scheme, the utility model has the following characteristics and advantages:

1. according to the utility model, through a power line carrier technology, continuously-changed power dispatching instruction signals can be transmitted to all loads connected with a target area power grid in real time.

2. The utility model can conveniently realize the power demand response covering all connected users without adding additional wireless communication equipment and relying on the action of personnel at the user side based on the existing alternating current power grid broadcast power dispatching instruction.

3. The transmitting device of the high-frequency carrier signal can be selectively arranged in a transformer substation or a distribution room of any voltage grade of a power system, and can adapt to power dispatching requirements of different scales.

4. The high-frequency carrier signal only contains frequency information, and the frequency corresponds to a scheduling instruction of a power system; the frequency band of the high-frequency carrier signal is not overlapped with the frequency band used by the existing power line carrier communication (such as used for communication, internet, remote meter reading of electric power and the like).

5. The relay device in the transmission line can realize the cross-transformer propagation of the power scheduling information (namely, high-frequency carrier signals).

6. The present invention can invoke all load types (including ac loads and dc loads) of the target area grid connection to participate in the power demand response.

7. If the load connected into the system of the utility model does not have a receiver or a corresponding controller of a high-frequency carrier signal, or the use requirement of the load per se limits the capacity of the load to participate in regulation, the load can maintain normal and safe operation and does not participate in the regulation method of the utility model.

In conclusion, the utility model can be widely applied to the existing alternating current power grid, continuously-changed power dispatching signals are transmitted to all loads connected with the power grid in real time, and the power demand response covering users connected with the power grid is realized.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Like reference numerals refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic diagram of a load power active regulation system based on an ac power grid power line carrier according to an embodiment of the present invention.

Fig. 2 is a flowchart of a load power active adjustment method based on an ac power grid power line carrier according to an embodiment of the present invention.

Detailed Description

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

The utility model provides a load power active regulation system based on an alternating current power grid power line carrier. The method comprises the steps that a sending device broadcasts a high-frequency carrier signal with continuously variable frequency within a certain appointed frequency range to a power grid of a target area through a power line carrier technology according to the real-time scheduling requirement of a power system; the high-frequency carrier signal is transmitted to all user side loads in the target area through the transmission line, and various user side loads actively adjust power according to the high-frequency carrier signal and the self power consumption requirement. Based on the existing alternating current power grid, the power dispatching instruction signal is broadcasted to the power grid of the target area in real time through the power line carrier technology, and the power demand response covering power grid connection users can be conveniently realized.

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

As shown in fig. 1, the active load power regulation system based on the ac power line carrier provided by the present embodiment includes a transmitting device 110, a transmission line 120, and a load, where the load includes an ac load 130 and/or a dc load 140.

The transmitting device 110 broadcasts a high-frequency carrier signal to a power grid of a target area through a power line carrier technology according to a real-time scheduling requirement of a power system. The high frequency carrier signal is transmitted to all connected user-side ac loads 130 and/or dc loads 140 in the target area via transmission line 120. The user side alternating current load 130 and/or the direct current load 140 of the target area actively adjust power according to the high-frequency carrier signal and the own power demand, so that the power demand response covering all connected user sides based on the existing alternating current power grid is realized.

In a preferred embodiment of the present invention, in order to be able to adapt to power dispatching requirements of different scales, the transmitting device 110 may select a substation or a distribution room set in any voltage class in the power system, such as a 110kV or 35kV substation in a region, a 10kV distribution room in a building, and the like. Specifically, the transmission device 110 may be disposed at the rear side of the transformer in the substation or the distribution room according to the actual situation of the power system.

Specifically, the transmission device 110 includes a signal processor 111, a power line carrier 112, a band pass filter 113, and a wave trap 114.

The signal processor 111 receives the command sent by the power system dispatching center and processes the power dispatching command into a signal recognizable by the power carrier 112.

The power carrier 112 modulates the signal into a high-frequency carrier signal with a frequency that can be continuously changed within a certain appointed frequency range. The high-frequency carrier signal only contains frequency information, the appointed frequency band is not overlapped with the frequency band (such as used for communication, internet, electric power remote meter reading and the like) used by the existing power line carrier communication, the appointed frequency band can be appointed with the user side by a power grid operation unit according to different application scenes (such as voltage level of access of the sending device 110, downstream maximum transmission distance and the like), specific numerical values are determined according to actual application conditions, and details are not repeated herein. The frequency of the high-frequency carrier signal corresponds to a command of a demand response of the power system, for example: the low frequency corresponds to insufficient power generation of the power system, and the load power of a user side needs to be reduced; the high frequency corresponds to the excessive power generation of the power system, and the load power of the user side needs to be increased. The specific frequency setting value of the high-frequency carrier signal is related to the actual condition of the power grid, and is not described herein.

The band pass filter 113 couples the high frequency carrier signal into the main power line and prevents the power frequency ac power in the main power line from going back to the power carrier 112. The band-pass filter 113 may be composed of a filter device such as a combination filter and a coupling capacitor.

And a wave trap 114, which is arranged between the high-frequency carrier signal access point and the upstream transformer, and ensures that the transmitting device 110 only broadcasts the signal to all the user sides of the power grid section (target power grid section) of the transformer.

In a preferred embodiment of the present invention, the transmission line 120 is an existing component in the power system for distributing the ac power carrying the high frequency carrier signal to all users in the target area.

Further, if the transmission line 120 includes the transformer 121, the relay device 122 needs to be provided accordingly. The relay device 122 is connected in parallel with the transformer 121, and if the transformer 121 is encountered during transmission and distribution, the relay device 122 connected in parallel with the transformer 121 realizes cross-transformer propagation of the high-frequency carrier signal. If the transmission line 120 does not include the transformer 121, for example, if the transmission device 110 is installed behind the final transformer in a building distribution room, the relay device 122 does not need to be installed.

In a preferred embodiment of the present invention, the load comprises an ac load 130 and/or a dc load 140. The AC power applied with the high-frequency carrier signal may be supplied to AC load 130 through transmission line 120, or may be supplied to DC load 140 through AC/DC converter 143.

Specifically, the ac load 130 includes various types of ac devices 131, which may refer to charging piles, air conditioners, lighting fixtures, and the like, but is not limited thereto. The ac electrical apparatus 131 includes a receiver 132, a controller 133, and the like, and the receiver 132 and the controller 133 may be directly built in the ac electrical apparatus 131 or may be externally installed. The receiver 132 may decouple the high frequency carrier signal from the incoming ac power and input to the controller 133 for power conditioning of the ac appliance 131.

Specifically, the dc loads 140 include various types of dc micro grids 141. The DC microgrid 141 includes a receiver 142, an AC/DC converter 143, and the like, and the receiver 142 and the AC/DC converter 143 may be integrated into one piece of equipment, and the configuration of the remaining equipment in the DC microgrid 141 is not limited. The receiver 142 may decouple the high frequency carrier signal from the incoming AC power and input it to the AC/DC converter 143 for power conditioning of the DC microgrid 141.

As shown in fig. 2, the active load power adjustment method based on the ac power grid power line carrier provided in this embodiment includes:

s1, a signal sending link: the power system dispatching center sends a power dispatching instruction according to a real-time dispatching requirement, the sending device 110 receives the instruction sent by the power system dispatching center, modulates the power dispatching instruction into a high-frequency carrier signal and broadcasts the high-frequency carrier signal to a power grid of a target power grid parcel, and the specific execution process comprises the following steps:

s11, the signal processor 111 receives the power dispatching command sent by the power system dispatching center.

S12, the signal processor 111 processes the power scheduling command into a signal recognizable by the power carrier 112.

S13, the power line carrier 112 modulates the signal into a high frequency carrier signal with a frequency continuously variable within a certain appointed frequency range, and the level of the signal frequency corresponds to the command of the demand response of the power system.

S14, the band-pass filter 113 couples the high-frequency carrier signal into the main network power line, and prevents the power frequency alternating current in the main network power line from reversely entering the power carrier machine 112 and other devices; the wave trap 114 ensures that the transmitting device 110 broadcasts the signal only to all users of the target grid sector.

S2, signal transmission link: the alternating current with the high-frequency carrier signal transmitted by the transmitting device 110 is transmitted and distributed to the alternating current load 130 and/or the direct current load 140 on the user side through the transmission line 120; if the transformer 121 is encountered in the transmission and distribution process, the high-frequency carrier signal is transmitted across the transformer through the relay device 122 connected in parallel with the transformer 121.

S3, an alternating current load adjusting link: if the ac power transmission including the high-frequency carrier signal is distributed to the ac load 130, the ac load 130 adjusts the power according to the high-frequency carrier signal and the power demand of the ac load, and the execution process includes:

s31, connecting the alternating current appliance 131 to a power grid containing high-frequency carrier signals;

s32, the receiver 132 of the alternating current appliance 131 safely decouples the high-frequency carrier signal and sends the high-frequency carrier signal to the controller 133;

and S33, the controller is used for adjusting the power taking power of the load in a proportional integral control mode.

S4, a direct current load adjusting link: if the ac power supply including the high-frequency carrier signal is distributed to the dc load 140, the dc load 140 adjusts the power according to the high-frequency carrier signal and the power demand of the dc load, and the execution process includes:

s41, the direct-current micro-grid 141 is connected to a power grid containing high-frequency carrier signals through the AC/DC converter 143;

s42, the receiver 142 of the direct current microgrid 141 safely decouples the high-frequency carrier signals and sends the high-frequency carrier signals to the AC/DC converter 143;

and S43, the AC/DC converter is used for adjusting the power taking power of the load in a proportional integral control mode.

Specifically, the proportional-integral control manner adopted in the steps S33 and S43 is an existing control method, and is embodied in the present invention to control the operating parameters (such as frequency, current, voltage, power, and the like) of the load according to the frequency of the high-frequency carrier signal, and the specific parameters of the proportional-integral control are determined according to the actual application scenario, which is not described herein again.

Further, the degree of load participation in the regulation is determined by the respective requirements of use, for example: for equipment (such as medical instruments, key area illumination and the like) which can cause casualties after adjustment, no matter what the frequency value of the high-frequency carrier signal is, the load does not participate in adjustment; for equipment which does not affect normal production and life after adjustment (such as advertisement lamp boxes, landscape fountains and the like in non-key areas), the equipment can be closed after the frequency of the high-frequency carrier signal is lower than a certain threshold value. If the load without the receiver or the controller is directly connected to the system, the load can maintain normal and safe operation and does not participate in the adjusting method.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In the description herein, references to the description of "one embodiment," "some implementations," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (5)

1. A load power active regulation system based on an alternating current power grid power line carrier is characterized by comprising a sending device, a transmission line and a load;

the transmitting device broadcasts a high-frequency carrier signal to a power grid of a target area through a power line carrier technology according to the real-time scheduling requirement of the power system;

the high-frequency carrier signal is sent to the loads of all user sides in the target area through the transmission line;

and the load actively adjusts the power according to the high-frequency carrier signal and the self power demand.

2. The active ac grid power line carrier based load power regulation system of claim 1, wherein the transmitter is located in a substation or a distribution room at any voltage level in the power system.

3. The active load power regulation system based on the power line carrier of the alternating current power grid is characterized in that the sending device comprises a signal processor, a power line carrier, a filtering device and a wave trapper;

the signal processor can receive a power scheduling instruction and send the power scheduling instruction to the power carrier machine;

the power carrier machine can modulate the signal into a high-frequency carrier signal with the frequency continuously variable within a certain appointed frequency range;

the filtering device can couple the high-frequency carrier signal into a main network power line and prevent power frequency alternating current in the main network power line from reversely entering the power carrier machine;

the wave trap can ensure that the high-frequency carrier signal is only broadcast to all loads of a target power grid parcel.

4. The active regulating system for load power based on power line carrier of alternating current power grid as claimed in claim 1, characterized in that if the transmission line includes a transformer, a relay device is correspondingly arranged, and the relay device is connected with the transformer in parallel, so as to realize the cross-transformer propagation of high-frequency carrier signal.

5. The active regulating system for load power based on the power line carrier of the alternating current power grid is characterized in that the load comprises an alternating current load directly connected in and/or a direct current load connected in through an alternating current-direct current converter;

the alternating current load comprises a receiver and a controller of a high-frequency carrier signal, wherein the receiver decouples the high-frequency carrier signal from the input alternating current and inputs the high-frequency carrier signal into the controller for load power regulation;

the direct-current load is a direct-current microgrid with a receiver and an alternating-current-direct-current converter, and the receiver decouples a high-frequency carrier signal from input alternating current and inputs the high-frequency carrier signal into the alternating-current-direct-current converter for load power regulation.

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