CN117691571A - Control method and system for flexible interconnection technology of low-voltage transformer area - Google Patents

Abstract

The invention discloses a method and a system, which relate to the technical field of signal devices and comprise the following steps: collecting data of a low-voltage transformer area power grid, and diagnosing a power grid state based on the power grid data; automatically adjusting the power grid of the low-voltage transformer area, and keeping the power grid running normally; displaying power grid state information and control information in real time; and carrying out remote monitoring and control on the low-voltage district power grid based on a remote communication technology. The control method of the flexible interconnection technology of the low-voltage transformer area effectively improves the electric energy quality in the power distribution network by adopting reactive power control, system voltage control, unbalanced load compensation control and power grid harmonic wave filtering control methods, regulates and controls the power flow distribution according to the running condition of the load, equipment state and other information, thereby adapting to the random change of the distributed power supply and the local load power, and realizes uninterrupted load transfer by depending on the AC/DC flexible interconnection and fault current limiting functions of the flexible transformer substation.

Description

Control method and system for flexible interconnection technology of low-voltage transformer area

Technical Field

The invention relates to the technical field of signal devices, in particular to a control method and a system for a flexible interconnection technology of a low-voltage transformer area.

Background

The energy source side faces to structural transformation, the traditional energy source is changed to new energy source and clean energy source, the terminal side user faces to highly electrified transformation, and the time-space characteristic of the load is changed; the distribution area is taken as an important component of the power system, and directly influences the local economic development and the daily life quality of users. As terminal-side users are subjected to highly electrified transformations, the temporal and spatial characteristics of electricity demand by people change. The popularization of electric automobiles, the increase of a distributed energy power generation system, the development of intelligent home and other technologies all have an influence on the power supply load of a distribution area.

The low-voltage transformer area at the present stage mostly adopts a single transformer and single line power supply mode, the reliability is low, and the power supply between the transformer areas is independent and lacks unified management and control. The low-voltage area in the current stage refers to a key node in the power distribution system, which is responsible for converting high-voltage power into low-voltage power and supplying the power to an end user. It is typically located in a city or regional power supply network responsible for transmitting power to various cells, businesses, and homes.

The low voltage transformer area typically takes the form of a single transformer, single line power supply. This means that each bay has only one main transformer and one main power supply line for transmitting power to the corresponding consumer. This configuration presents some drawbacks and challenges to some extent.

First, the reliability of the low voltage region is low. Because of the single transformer power supply, once the main transformer fails or needs maintenance, the power supply of the whole transformer area can be interrupted, and the normal power utilization of users is affected. This causes problems such as production stoppage, life blockage, etc., which brings inconvenience and economic loss to users.

And secondly, power supply among all the areas is independent, and unified management and control are lacked. This means that in case of a power failure or problem, fail-over and restoration of power cannot be performed promptly. The independence of power supply between the bays also causes fragmentation and management difficulties for the energy system. This complicates monitoring, maintenance and optimization of the entire grid for the distribution operators.

In addition, as the degree of electrification of electric power increases and the demand of consumers for quality of electric power increases, the load time and spatial characteristics faced by low-voltage bays change. For example, the widespread popularity of electric vehicles and the increase in distributed energy systems have created new load challenges for low voltage bays. This requires that the low voltage power supply area be able to quickly adapt and respond to load fluctuations at different time periods and different locations, ensuring the stability and reliability of the power supply.

Disclosure of Invention

The present invention has been made in view of the above-described problems.

Therefore, the technical problems solved by the invention are as follows: the existing low-voltage station control method has the problems that the work reliability is low, unified management and control is lacked, new load characteristics are difficult to adapt, and load fluctuation and low efficiency of different time periods and different places cannot be quickly adapted and responded.

In order to solve the technical problems, the invention provides the following technical scheme: a control method of a low-voltage area flexible interconnection technology comprises the following steps: and collecting data of the low-voltage transformer area power grid, diagnosing the power grid state based on the power grid data, automatically adjusting the low-voltage transformer area power grid, keeping the power grid normal in operation, displaying power grid state information and control information in real time, and remotely monitoring and controlling the low-voltage transformer area power grid based on a remote communication technology.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the step of collecting the data of the low-voltage transformer area power grid comprises the steps of collecting the current, the voltage and the power of the low-voltage transformer area power grid, monitoring the operation condition of the low-voltage flexible interconnection device, collecting the position state, and controlling the switch access state and the state information of an output loop;

If the loop switch is shifted, the controller stores the event and sends a shifting signal or actively reports to the master station when the master station inquires.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the diagnosing the power grid state based on the power grid data comprises analyzing and processing the collected data and diagnosing the power grid state;

if the abnormal condition of the power grid comprises power failure, overload, short circuit, continuous disorder, voltage fluctuation and frequency offset, the controller stores the abnormal condition and sends a deflection signal to the main station or actively reports the deflection signal when the main station inquires;

if the abnormal condition is a power failure, a nearby standby power supply or energy storage equipment is quickly connected in by using a flexible interconnection technology, power is temporarily supplied, and a cloud data prediction technology is used for detecting possible power failure in advance and scheduling resources;

if the abnormal condition is overload, automatically adjusting load distribution through a low-voltage flexible interconnection controller, transferring part of power to a line without the abnormal condition, monitoring real-time load and predicting load added in the future by utilizing an internet of things sensing terminal, and adjusting in advance;

if the abnormal condition is short circuit, the short circuit area is rapidly isolated by utilizing a flexible interconnection technology, and the area without the abnormal condition is reconnected with the main network;

If the abnormal condition is the disorder, a primary fusion intelligent breaker and a secondary fusion intelligent breaker are used, when the disorder is detected, the device is rapidly disconnected, equipment damage is avoided, the communication function of the flexible interconnection device of the platform area is utilized, the phase sequence of the power grid is monitored in real time, and once the abnormality is detected, the correction is carried out;

if the abnormal condition is voltage fluctuation, using energy storage equipment to provide power for a power grid, suppressing the voltage fluctuation, using an Internet of things sensing terminal to predict a voltage fluctuation event, and performing voltage regulation in advance by using a flexible interconnection technology;

if the abnormal condition is frequency offset, the power supply frequency is automatically adjusted by using the platform area interconnection of the flexible direct current technology, and is kept consistent with the standard frequency, and the frequency offset is monitored in real time by combining with the technical architecture of the power distribution internet of things, and is dynamically adjusted according to the predicted data;

if the power grid is not abnormal, the controller responds to the calling, and sends power grid state information to the intelligent fusion terminal of the area at regular time or randomly to acquire relevant operation data of the intelligent fusion terminal side of the area, and the intelligent fusion terminal side of the area communicates with the flexible interconnection device of the area, and the controller responds to the requirement of the on-site side rapid control through optical fibers;

the controller supports communication with the intelligent fusion terminal of the platform area, and a lightweight communication protocol is adopted.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the method comprises the steps that a low-voltage area power grid is automatically regulated, the power grid is kept running normally, a controller is used for setting and inquiring parameters through a master station, an area intelligent fusion terminal or a local operation and maintenance tool, the controller is set, communication addresses, configuration parameters and communication parameters are inquired, event generation or recovery is automatically judged according to event attributes set by the master station or the area intelligent fusion terminal, and local state indication is provided;

wherein the communication parameters comprise wireless remote communication parameters, ethernet local communication parameters and local maintenance port communication parameters;

the controller sets acquisition data comprising point table information, acquisition frequency, operation control strategy and protection parameter fixed values;

wherein the events include critical events, important events and common events;

if the event is identified as a critical event, the event causes instantaneous interruption of the power grid or equipment damage, the parameter configuration reaches a reporting valve value, the controller records parameters including event type, occurrence time and associated data information, and reports the parameter state to the master station for subsequent inquiry or analysis;

When the critical event is judged to be communication interruption, the local maintenance port is used for emergency communication, and emergency recovery is carried out through the intelligent fusion terminal of the station area;

when the critical event is judged to be equipment damage, notifying maintenance personnel to carry out emergency maintenance in an Ethernet or wireless remote communication mode, and carrying out remote monitoring on the equipment state by using the intelligent fusion terminal of the station area;

if the event is identified as an important event, the event affects the normal operation of the power grid, the power grid is not interrupted, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day, if the event is repeated for more than 5 times within 1 hour, marks the event as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

when the important event is judged to be unstable in power grid operation, the controller collects frequency and operation control strategies according to point table information, automatically adjusts load or manually adjusts frequency through a platform area intelligent fusion terminal or a local operation and maintenance tool;

if the event is identified as a common event, the event has no influence on the operation of the power grid, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day for summarization, and if the event is repeated for more than 5 times within 1 hour, the event is marked as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

When the common event is judged to be small fluctuation of power grid operation or small equipment failure, the controller tries to reestablish connection, if the connection cannot be reestablished, safety Bluetooth is started or local maintenance port communication is used, maintenance personnel are notified, the controller tries to recover by itself, and if the connection fails, a backup system is started; the intelligent fusion terminal or the local operation and maintenance tool of the platform region is used for carrying out software upgrading or rolling back to the last stable version;

the controller records parameters including event type, occurrence time and associated data information, and reports parameter states to the master station for subsequent inquiry or analysis;

if the parameter configuration does not reach the reported valve value when the event is generated or recovered, the controller does not report the event record, sends an alarm, notifies maintenance personnel or executes automatic adjustment, and simultaneously records alarm information to provide data for subsequent inquiry and analysis;

the local state comprises the functions of indicating the operation of the terminal, data transmission and alarming, and is provided with a safe Bluetooth and Ethernet local maintenance interface, and the terminal parameters and the fixed value are set through the maintenance interface to upgrade the software.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the real-time display of the power grid state information and the control information comprises connecting a centralized measurement and control terminal with direct-current equipment on a direct-current busbar through a micropower wireless and carrier dual-mode communication network under a flexible direct-current interconnection device station area;

The head end module is arranged on the centralized measurement and control terminal, and the tail end module is arranged on the direct current equipment on the direct current busbar.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the real-time display of the power grid state information and the control information comprises forming a mesh network structure centering on a head end node by a dual-mode communication network architecture, wherein the head end node and the tail end node take wireless and power line carriers as transmission media;

wherein the micropower wireless and carrier dual-mode communication network is composed of a head-end node and a tail-end node, the head-end node and the plurality of tail-end nodes forming a head-end node centric mesh network.

As a preferable scheme of the control method of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the remote monitoring and control of the low-voltage station power grid based on the remote communication technology comprises the steps of designating an optimal scheduling instruction to an interconnection system through a controller and an energy management system by prediction data, realizing real-time monitoring and control of the running state of the station interconnection system, simultaneously carrying out intelligent transformation of the medium-low voltage internet of things by combining the station interconnection based on the flexible direct current technology with the technical architecture of the power distribution internet of things, replacing a station low-voltage main incoming line switch and a feeder line switch in the system, deploying a primary fusion intelligent circuit breaker and a secondary fusion intelligent circuit breaker, sensing a terminal, enabling the environment monitoring internet of things terminal equipment to enter a cloud master station system through wireless communication, and realizing full sensing of the running state of the station.

Another object of the present invention is to provide a flexible interconnection technology control system for a low-voltage transformer area, which can improve reliability, economy and safety of a power grid by performing real-time monitoring, remote control and automatic adjustment on the power grid of the low-voltage transformer area.

As a preferable scheme of the control system of the flexible interconnection technology of the low-voltage area, the invention comprises the following steps: the system comprises an initialization module, a power grid diagnosis module, a power grid control module, an information display module and a power grid monitoring control module; the initialization module is used for collecting data, position state and control output loop switch access state and state information of a low-voltage transformer area power grid and monitoring operation conditions of the low-voltage flexible interconnection device; the power grid diagnosis module is used for analyzing and processing data, diagnosing the power grid state and feeding back abnormal conditions of the power grid; the power grid control module is used for automatically adjusting the power grid of the low-voltage transformer area and keeping the power grid in a normal state; the information display module is used for displaying power grid state information and control information; the power grid monitoring control is used for remotely monitoring and controlling the low-voltage district power grid through a remote communication technology.

A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that execution of said computer program by said processor is the step of implementing a method for controlling a low voltage area flexible interconnect technology.

A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a method for controlling a flexible interconnection technique of a low voltage area.

The invention has the beneficial effects that: the control method of the flexible interconnection technology of the low-voltage transformer area reduces the system voltage deviation, improves the voltage unbalance, inhibits the system voltage fluctuation and filters the power grid harmonic wave by adopting reactive power control, system voltage control, compensation unbalanced load control and a power grid harmonic wave filtering control method, effectively improves the electric energy quality in a power distribution network, flexibly and dynamically regulates and controls the power flow distribution according to the information of the running condition, equipment state and the like of the load so as to adapt to the random change of the distributed power supply and the local load power, and further realizes the uninterrupted power supply of the load by depending on the AC/DC flexible interconnection and fault current limiting function of a flexible transformer substation, can limit the current when the power distribution network is short-circuited, can realize fault isolation under the fault condition, and further improves the power supply capacity of the power distribution network.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is an overall flowchart of a control method of a flexible interconnection technology of a low-voltage area according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram of a common dc bus centralized configuration flexible interconnection system according to a control method of a flexible interconnection technology of a low-voltage transformer area according to a first embodiment of the present invention.

Fig. 3 is a schematic diagram of a distributed flexible interconnection system configured by segments of a dc bus according to a control method of a flexible interconnection technology of a low-voltage transformer area according to a first embodiment of the present invention.

Fig. 4 is a schematic diagram of a low-voltage area flexible interconnection control system according to a control method of a low-voltage area flexible interconnection technology according to a first embodiment of the present invention.

Fig. 5 is a schematic diagram of a flexible interconnection ac/dc multi-stage collaboration of a low-voltage area according to a control method of a flexible interconnection technology of a low-voltage area according to a first embodiment of the present invention.

Fig. 6 is a schematic diagram of low-voltage area flexible internet load coordination according to a control method of low-voltage area flexible interconnection technology according to a first embodiment of the present invention.

Fig. 7 is a schematic diagram of low-voltage area flexible interconnection source load coordination of a control method of low-voltage area flexible interconnection technology according to a first embodiment of the present invention.

Fig. 8 is an overall flowchart of a control system for flexible interconnection technology in a low voltage area according to a third embodiment of the present invention.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1-7, for one embodiment of the present invention, a method for controlling a flexible interconnection technology of a low voltage area is provided, including:

s1: and collecting data of a low-voltage transformer area power grid.

Further, collecting the data of the low-voltage transformer area power grid comprises collecting the current, the voltage and the power of the low-voltage transformer area power grid, monitoring the operation condition of the low-voltage flexible interconnection device, collecting the position state, and controlling the switch access state and the state information of the output loop; if the loop switch is shifted, the controller stores the event and sends a shifting signal or actively reports to the master station when the master station inquires.

It should be noted that the low voltage flexible interconnect in-situ controller has a voltage acquisition function, measuring voltage, current, power factor, etc. And monitoring the operation condition of the low-voltage flexible interconnection device in real time. The controller collects the position state, the switch-in state and other state information of the control output loop switch in real time, stores the event when the displacement occurs and sends the displacement signal or actively reports the displacement signal to the controller when the main station inquires the latest time.

S2: analyzing and processing the acquired data, and diagnosing the state of the power grid;

further, analyzing and processing the collected data to diagnose the state of the power grid;

if the abnormal condition of the power grid comprises power failure, overload, short circuit, continuous disorder, voltage fluctuation and frequency offset, the controller stores the abnormal condition and sends a deflection signal to the main station or actively reports the deflection signal when the main station inquires;

if the abnormal condition is a power failure, a nearby standby power supply or energy storage equipment is quickly connected in by using a flexible interconnection technology, power is temporarily supplied, and a cloud data prediction technology is used for detecting possible power failure in advance and scheduling resources;

if the abnormal condition is overload, automatically adjusting load distribution through a low-voltage flexible interconnection controller, transferring part of power to a line without the abnormal condition, monitoring real-time load and predicting load added in the future by utilizing an internet of things sensing terminal, and adjusting in advance;

if the abnormal condition is short circuit, the short circuit area is rapidly isolated by utilizing a flexible interconnection technology, and the area without the abnormal condition is reconnected with the main network;

if the abnormal condition is the disorder, a primary fusion intelligent breaker and a secondary fusion intelligent breaker are used, when the disorder is detected, the device is rapidly disconnected, equipment damage is avoided, the communication function of the flexible interconnection device of the platform area is utilized, the phase sequence of the power grid is monitored in real time, and once the abnormality is detected, the correction is carried out;

If the abnormal condition is voltage fluctuation, using energy storage equipment to provide power for a power grid, suppressing the voltage fluctuation, using an Internet of things sensing terminal to predict a voltage fluctuation event, and performing voltage regulation in advance by using a flexible interconnection technology;

if the abnormal condition is frequency offset, the power supply frequency is automatically adjusted by using the platform area interconnection of the flexible direct current technology, and is kept consistent with the standard frequency, and the frequency offset is monitored in real time by combining with the technical architecture of the power distribution internet of things, and is dynamically adjusted according to the predicted data;

if the power grid is not abnormal, the controller responds to the calling, and sends power grid state information to the intelligent fusion terminal of the area at regular time or randomly to acquire relevant operation data of the intelligent fusion terminal side of the area, and the intelligent fusion terminal side of the area communicates with the flexible interconnection device of the area, and the controller responds to the requirement of the on-site side rapid control through optical fibers;

the controller supports communication with the intelligent fusion terminal of the platform area, and a lightweight communication protocol is adopted.

It should be noted that, the controller supports communication with the intelligent fusion terminal of the platform, preferably adopts a lightweight communication protocol, including responding to the call; or sending related information to the intelligent fusion terminal of the platform area at regular time and randomly; acquiring relevant operation data of a platform area intelligent fusion terminal side; the controller supports communication with other flexible interconnection devices in the area, and communicates through optical fibers to respond to the requirement of on-site rapid control.

S3: and automatically adjusting the low-voltage power grid in the transformer area to keep the power grid in a normal state.

Furthermore, the controller sets and inquires parameters through the master station, the intelligent fusion terminal of the platform area or the local operation and maintenance tool, sets the controller and inquires a communication address, configuration parameters and communication parameters, automatically judges event generation or recovery according to event attributes set by the master station or the intelligent fusion terminal of the platform area, and has a local state indication;

wherein the communication parameters comprise wireless remote communication parameters, ethernet local communication parameters and local maintenance port communication parameters;

the controller sets acquisition data comprising point table information, acquisition frequency, operation control strategy and protection parameter fixed values;

wherein the events include critical events, important events and common events;

if the event is identified as a critical event, the event causes instantaneous interruption of the power grid or equipment damage, the parameter configuration reaches a reporting valve value, the controller records parameters including event type, occurrence time and associated data information, and reports the parameter state to the master station for subsequent inquiry or analysis;

when the critical event is judged to be communication interruption, the local maintenance port is used for emergency communication, and emergency recovery is carried out through the intelligent fusion terminal of the station area;

When the critical event is judged to be equipment damage, notifying maintenance personnel to carry out emergency maintenance in an Ethernet or wireless remote communication mode, and carrying out remote monitoring on the equipment state by using the intelligent fusion terminal of the station area;

if the event is identified as an important event, the event affects the normal operation of the power grid, the power grid is not interrupted, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day, if the event is repeated for more than 5 times within 1 hour, marks the event as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

when the important event is judged to be unstable in power grid operation, the controller collects frequency and operation control strategies according to point table information, automatically adjusts load or manually adjusts frequency through a platform area intelligent fusion terminal or a local operation and maintenance tool;

if the event is identified as a common event, the event has no influence on the operation of the power grid, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day for summarization, and if the event is repeated for more than 5 times within 1 hour, the event is marked as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

when the common event is judged to be small fluctuation of power grid operation or small equipment failure, the controller tries to reestablish connection, if the connection cannot be reestablished, safety Bluetooth is started or local maintenance port communication is used, maintenance personnel are notified, the controller tries to recover by itself, and if the connection fails, a backup system is started; the intelligent fusion terminal or the local operation and maintenance tool of the platform region is used for carrying out software upgrading or rolling back to the last stable version;

The controller records parameters including event type, occurrence time and associated data information, and reports parameter states to the master station for subsequent inquiry or analysis;

if the parameter configuration does not reach the reported valve value when the event is generated or recovered, the controller does not report the event record, sends an alarm, notifies maintenance personnel or executes automatic adjustment, and simultaneously records alarm information to provide data for subsequent inquiry and analysis;

the local state comprises the functions of indicating the operation of the terminal, data transmission and alarming, and is provided with a safe Bluetooth and Ethernet local maintenance interface, and the terminal parameters and the fixed value are set through the maintenance interface to upgrade the software. It should be noted that the parameters are set and queried. The controller supports parameter setting and inquiry by a master station, a zone intelligent fusion terminal or a local operation and maintenance tool. The controller may be set and queried for communication addresses, configuration parameters, communication parameters, etc. The communication parameters include wireless telecommunication parameters, ethernet local communication parameters, local maintenance port communication parameters. The controller can be provided with information such as data point table information, acquisition frequency, operation control strategy, protection parameter fixed value and the like.

It should also be noted that the event is reported. The controller automatically judges event generation or recovery according to the event attribute set by the master station or the intelligent fusion terminal of the platform, decides whether reporting is needed according to parameter configuration when the event is generated or recovered, and records reporting state. The content of each record includes event type, time of occurrence and related associated data information.

Further, the local function. The system has local state indication to indicate the working states of terminal operation, data transmission, alarm and the like. The system is provided with a local maintenance interface such as a safe Bluetooth interface and an Ethernet interface, and terminal parameters and fixed values are set through the maintenance interface to perform software upgrading and the like.

S4: and displaying the power grid state information and the control information in real time.

Furthermore, under the flexible direct interconnection device platform area, the centralized measurement and control terminal and direct current equipment on the direct current busbar are connected through a micropower wireless and carrier dual-mode communication network; the head end module is arranged on the centralized measurement and control terminal, and the tail end module is arranged on the direct current equipment on the direct current busbar.

It should be noted that, in the micro-power wireless+carrier dual-mode communication mode, under the flexible direct interconnection device platform area, the centralized measurement and control terminal and the direct current equipment on the direct current busbar can be connected through the micro-power wireless+carrier dual-mode communication network: the head end module is arranged on the centralized measurement and control terminal, and the tail end module is arranged on the direct current equipment on the direct current busbar.

It should also be noted that the dual-mode communication network architecture, the micro-power wireless + carrier dual-mode communication network is comprised of a head-end node (HD) and a tail-end node (ED), with the head-end node and the plurality of tail-end nodes forming a head-end node centric mesh network. The head-end node is a central node of the network, supports HPLC and 470MHz-RF communication, is responsible for network construction, collision avoidance, IP address allocation, network maintenance and management, and is responsible for access management, route maintenance and resource allocation of the tail-end node, so that data transmission of all nodes and centralized measurement and control terminals in the network is realized. The tail end node is a slave node of the network, supports HPLC and communication, participates in construction, maintenance and management of the network, and is responsible for data transmission of the node and data forwarding of the child nodes thereof. The communication network is centered at a head-end node, and the head-end node and tail-end node are centered at wireless and power line carriers as transmission media, forming a mesh network structure centered at the head-end node.

S5: and remotely monitoring and controlling the low-voltage district power grid through a remote communication technology.

Furthermore, the controller and the energy management system can assign an optimized scheduling instruction to the interconnected system based on the predicted data, so that the running state of the interconnected system of the station area can be monitored and controlled in real time. Platform region interconnection based on flexible direct current technology can combine "cloud, pipe, limit, end" distribution internet of things technical architecture to develop middle-low voltage internet of things intelligent transformation, and platform region low voltage main inlet wire switch, feeder switch need replace in the former system, deploy once fuse intelligent circuit breaker and secondary and fuse intelligent circuit breaker, perception terminal, environmental monitoring etc. internet of things end equipment gets into cloud main website system through wireless communication, realizes platform region running state and fully perceives, and the cooperation fuses functions such as link up, electric energy quality optimization promotion.

It should be noted that, when being applied to low voltage terminal interconnection, promote feeder power quality.

When the flexible multi-state switch is connected to the low-voltage terminal of the power distribution network, various regulation and control targets of coordinating and absorbing renewable energy sources, improving the electric energy quality and balancing the feeder load can be realized, and a comprehensive regulation and control means of the power distribution network is formed.

The reactive power control, the system voltage control, the unbalanced load compensation control and the power grid harmonic wave filtering control method are adopted to reduce the system voltage deviation, improve the voltage unbalance, inhibit the system voltage fluctuation and filter the power grid harmonic wave, so that the electric energy quality in the power distribution network is effectively improved.

According to the information of the running condition of the load, the equipment state and the like, the power flow distribution is flexibly and dynamically regulated so as to adapt to the random change of the distributed power supply and the local load power, and meanwhile, the flexible multi-state switch can also carry out quick power flow inversion and feeder line balance control according to the actual situation of the site.

It should also be noted that when different voltage feeders are interconnected, different voltage levels are mutually supported.

The flexible interconnection of different voltage feeder lines can also be called as a flexible transformer substation, is a power electronic product based on primary equipment of a conventional transformer substation, has medium/low voltage and AC/DC multi-port interface connection, can flexibly cope with the bidirectional tide problem caused by grid connection of a distributed power supply, realizes flexible access and efficient utilization of the distributed energy, improves the reliability of a power distribution network, and fully utilizes renewable energy.

By means of the AC/DC flexible interconnection and fault current limiting functions of the flexible transformer substation, uninterrupted load transfer can be achieved, current can be limited when the power distribution network is short-circuited, fault isolation can be achieved under fault conditions, and power supply capacity of the power distribution network is further improved.

When the power distribution network breaks down, fault current can be effectively limited through quick locking of the flexible multi-state switch, fault isolation between partitions is achieved, short-circuit capacity of an original system is kept unchanged, and operation of the power distribution network can be recovered as soon as possible only by adjusting outlet voltage of the flexible multi-state switch.

Example 2

In order to verify the beneficial effects of the invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

Two sets of distribution system configurations were selected for testing, two sets of experiments were performed, one set being a conventional low voltage distribution system and the other set using the present invention to perform the same operation.

As shown in table 1, in this experiment, the conventional low voltage power distribution system represented a conventional low voltage power distribution system using a single transformer and single line power supply. The experiment is to monitor parameters such as voltage deviation, voltage unbalance, voltage fluctuation, harmonic distortion and the like so as to evaluate the electric energy quality performance of the traditional system.

In another aspect, the invention includes flexible multi-state switches and flexible interconnect technology. The experiment will monitor the power quality parameter and will also monitor the power flow profile within the system. By utilizing reactive power control, system voltage control, unbalanced load compensation and harmonic wave filtering methods, the novel technology aims at improving the electric energy quality and realizing flexible control on the electric power flow distribution.

Experiments will record the power quality problems and limitations observed in conventional systems, as well as the power quality improvements and flexibility of power flow control obtained using the present invention. Data analysis will involve comparing the performance of the conventional technique with the improvement of the present invention.

Table 1 comparison of experimental results

In the comparative data, the power quality parameters under the conventional technology include voltage deviation, voltage unbalance, voltage fluctuation and harmonic distortion. In contrast, improvements are presented using these power quality parameters of the present invention.

For example, the voltage deviation is reduced from 2.5% in the traditional technology to 1.0% in the new technology; the voltage unbalance is reduced from 3.2% in the traditional technology to 1.5% in the new technology; the voltage fluctuation is reduced from 4.0% in the prior art to 1.7% in the new technology; the harmonic distortion is reduced from 7.8% in the traditional technology to 3.2% in the new technology.

In addition, the invention also has flexibility of flow distribution control, and compared with the limited control capacity of the traditional technology, the novel technology can more flexibly adjust the power flow distribution so as to adapt to different requirements and conditions.

In view of the above, my invention is a preferred solution in terms of time consumption.

Example 3

Referring to fig. 8, for one embodiment of the present invention, there is provided a computing platform load balancing system based on a particle swarm genetic algorithm, comprising: the system comprises an initialization module, a power grid diagnosis module, a power grid control module, an information display module and a power grid monitoring control module.

The system comprises an initialization module, a power grid diagnosis module, an information display module and a remote communication technology, wherein the initialization module is used for collecting data, position states and control output loop switch access states and state information of a low-voltage power grid, monitoring operation conditions of a low-voltage flexible interconnection device, the power grid diagnosis module is used for analyzing and processing the data, diagnosing power grid states and feeding back abnormal power grid conditions, the power grid control module is used for automatically adjusting the low-voltage power grid and keeping the power grid to operate in a normal state, the information display module is used for displaying the power grid state information and control information, and the power grid monitoring control is used for remotely monitoring and controlling the power grid of the low-voltage power grid through the remote communication technology.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium upon which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like. It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims (10)

1. The control method of the flexible interconnection technology of the low-voltage station area is characterized by comprising the following steps of:

collecting data of a low-voltage transformer area power grid, and diagnosing a power grid state based on the power grid data;

automatically adjusting the power grid of the low-voltage transformer area, and keeping the power grid running normally;

displaying power grid state information and control information in real time;

and carrying out remote monitoring and control on the low-voltage district power grid based on a remote communication technology.

2. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the step of collecting the data of the low-voltage transformer area power grid comprises the steps of collecting the current, the voltage and the power of the low-voltage transformer area power grid, monitoring the operation condition of the low-voltage flexible interconnection device, collecting the position state, and controlling the switch access state and the state information of an output loop;

If the loop switch is shifted, the controller stores the event and sends a shifting signal or actively reports to the master station when the master station inquires.

3. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the diagnosing the power grid state based on the power grid data comprises analyzing and processing the collected data and diagnosing the power grid state;

if the abnormal condition of the power grid comprises power failure, overload, short circuit, continuous disorder, voltage fluctuation and frequency offset, the controller stores the abnormal condition and sends a deflection signal to the main station or actively reports the deflection signal when the main station inquires;

if the abnormal condition is a power failure, a nearby standby power supply or energy storage equipment is quickly connected in by using a flexible interconnection technology, power is temporarily supplied, and a cloud data prediction technology is used for detecting possible power failure in advance and scheduling resources;

if the abnormal condition is overload, automatically adjusting load distribution through a low-voltage flexible interconnection controller, transferring part of power to a line without the abnormal condition, monitoring real-time load and predicting load added in the future by utilizing an internet of things sensing terminal, and adjusting in advance;

if the abnormal condition is short circuit, the short circuit area is rapidly isolated by utilizing a flexible interconnection technology, and the area without the abnormal condition is reconnected with the main network;

If the abnormal condition is the disorder, a primary fusion intelligent breaker and a secondary fusion intelligent breaker are used, when the disorder is detected, the device is rapidly disconnected, equipment damage is avoided, the communication function of the flexible interconnection device of the platform area is utilized, the phase sequence of the power grid is monitored in real time, and once the abnormality is detected, the correction is carried out;

if the abnormal condition is voltage fluctuation, using energy storage equipment to provide power for a power grid, suppressing the voltage fluctuation, using an Internet of things sensing terminal to predict a voltage fluctuation event, and performing voltage regulation in advance by using a flexible interconnection technology;

if the abnormal condition is frequency offset, the power supply frequency is automatically adjusted by using the platform area interconnection of the flexible direct current technology, and is kept consistent with the standard frequency, and the frequency offset is monitored in real time by combining with the technical architecture of the power distribution internet of things, and is dynamically adjusted according to the predicted data;

if the power grid is not abnormal, the controller responds to the calling, and sends power grid state information to the intelligent fusion terminal of the area at regular time or randomly to acquire relevant operation data of the intelligent fusion terminal side of the area, and the intelligent fusion terminal side of the area communicates with the flexible interconnection device of the area, and the controller responds to the requirement of the on-site side rapid control through optical fibers;

the controller supports communication with the intelligent fusion terminal of the platform area, and a lightweight communication protocol is adopted.

4. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the method comprises the steps that a low-voltage area power grid is automatically regulated, the power grid is kept running normally, a controller is used for setting and inquiring parameters through a master station, an area intelligent fusion terminal or a local operation and maintenance tool, the controller is set, communication addresses, configuration parameters and communication parameters are inquired, event generation or recovery is automatically judged according to event attributes set by the master station or the area intelligent fusion terminal, and local state indication is provided;

wherein the communication parameters comprise wireless remote communication parameters, ethernet local communication parameters and local maintenance port communication parameters;

the controller sets acquisition data comprising point table information, acquisition frequency, operation control strategy and protection parameter fixed values;

wherein the events include critical events, important events and common events;

if the event is identified as a critical event, the event causes instantaneous interruption of the power grid or equipment damage, the parameter configuration reaches a reporting valve value, the controller records parameters including event type, occurrence time and associated data information, and reports the parameter state to the master station for subsequent inquiry or analysis;

When the critical event is judged to be communication interruption, the local maintenance port is used for emergency communication, and emergency recovery is carried out through the intelligent fusion terminal of the station area;

when the critical event is judged to be equipment damage, notifying maintenance personnel to carry out emergency maintenance in an Ethernet or wireless remote communication mode, and carrying out remote monitoring on the equipment state by using the intelligent fusion terminal of the station area;

if the event is identified as an important event, the event affects the normal operation of the power grid, the power grid is not interrupted, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day, if the event is repeated for more than 5 times within 1 hour, marks the event as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

when the important event is judged to be unstable in power grid operation, the controller collects frequency and operation control strategies according to point table information, automatically adjusts load or manually adjusts frequency through a platform area intelligent fusion terminal or a local operation and maintenance tool;

if the event is identified as a common event, the event has no influence on the operation of the power grid, the parameter configuration does not reach the reporting valve value, the controller records the event, reports the event once a day for summarization, and if the event is repeated for more than 5 times within 1 hour, the event is marked as a critical event, and the controller reports the parameter state for subsequent inquiry or analysis;

When the common event is judged to be small fluctuation of power grid operation or small equipment failure, the controller tries to reestablish connection, if the connection cannot be reestablished, safety Bluetooth is started or local maintenance port communication is used, maintenance personnel are notified, the controller tries to recover by itself, and if the connection fails, a backup system is started; the intelligent fusion terminal or the local operation and maintenance tool of the platform region is used for carrying out software upgrading or rolling back to the last stable version;

the controller records parameters including event type, occurrence time and associated data information, and reports parameter states to the master station for subsequent inquiry or analysis;

if the parameter configuration does not reach the reported valve value when the event is generated or recovered, the controller does not report the event record, sends an alarm, notifies maintenance personnel or executes automatic adjustment, and simultaneously records alarm information to provide data for subsequent inquiry and analysis;

the local state comprises the functions of indicating the operation of the terminal, data transmission and alarming, and is provided with a safe Bluetooth and Ethernet local maintenance interface, and the terminal parameters and the fixed value are set through the maintenance interface to upgrade the software.

5. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the real-time display of the power grid state information and the control information comprises connecting a centralized measurement and control terminal with direct-current equipment on a direct-current busbar through a micropower wireless and carrier dual-mode communication network under a flexible direct-current interconnection device station area;

The head end module is arranged on the centralized measurement and control terminal, and the tail end module is arranged on the direct current equipment on the direct current busbar.

6. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the real-time display of the power grid state information and the control information comprises forming a mesh network structure centering on a head end node by a dual-mode communication network architecture, wherein the head end node and the tail end node take wireless and power line carriers as transmission media;

wherein the micropower wireless and carrier dual-mode communication network is composed of a head-end node and a tail-end node, the head-end node and the plurality of tail-end nodes forming a head-end node centric mesh network.

7. The control method for the flexible interconnection technology of the low-voltage area according to claim 1, wherein the control method comprises the following steps: the remote monitoring and control of the low-voltage station power grid based on the remote communication technology comprises the steps of designating an optimal scheduling instruction to an interconnection system through a controller and an energy management system by prediction data, realizing real-time monitoring and control of the running state of the station interconnection system, simultaneously carrying out intelligent transformation of the medium-low voltage internet of things by combining the station interconnection based on the flexible direct current technology with the technical architecture of the power distribution internet of things, replacing a station low-voltage main incoming line switch and a feeder line switch in the system, deploying a primary fusion intelligent circuit breaker and a secondary fusion intelligent circuit breaker, sensing a terminal, enabling the environment monitoring internet of things terminal equipment to enter a cloud master station system through wireless communication, and realizing full sensing of the running state of the station.

8. A system employing a control method of a flexible interconnection technology of a low voltage area according to any one of claims 1 to 7, characterized in that: the system comprises an initialization module, a power grid diagnosis module, a power grid control module, an information display module and a power grid monitoring control module;

the initialization module is used for collecting data, position state and control output loop switch access state and state information of a low-voltage transformer area power grid and monitoring operation conditions of the low-voltage flexible interconnection device;

the power grid diagnosis module is used for analyzing and processing data, diagnosing the power grid state and feeding back abnormal conditions of the power grid;

the power grid control module is used for automatically adjusting the power grid of the low-voltage transformer area and keeping the power grid in a normal state;

the information display module is used for displaying power grid state information and control information;

the power grid monitoring control is used for remotely monitoring and controlling the low-voltage district power grid through a remote communication technology.

9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of a low voltage area flexible interconnect technology control method as claimed in any one of claims 1 to 7.

10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of a low voltage bay flexible interconnect technology control method of any of claims 1 to 7.