CN103178617B - Power grid operation state monitoring and analyzing system and method for power system - Google Patents

Abstract

The invention discloses a system for monitoring and analyzing the operating state of a power system grid, which includes a collection client, a terminal server, a data storage and a data collection node. The data collection node includes a signal transceiver, a geographic information processor, and a signal controller; The detector acquires several signals in the set area, and the position information of the signal is determined by the maximum value of the signal strength in the geographic information processor, and then the signal is processed by the signal controller and sent to the acquisition client through the signal transceiver. The present invention realizes: 1) It complements the existing system and integrates the functions required for dispatching; 2) One interface can intuitively and real-time reflect the abnormal operation mode, abnormality, and early warning of the main network frame of the power grid; 3) Realize the intelligent identification of main transformer N-1, auxiliary processing functions, comprehensive analysis of reactive power and voltage, and SMS alarm functions; 4) It is easy to develop and maintain later. The invention also discloses a monitoring and analysis method.

Description

Power system grid operation status monitoring and analysis system and monitoring and analysis method

technical field

The present invention relates to power transmission and distribution technology of electric power system grid, more specifically, the present invention relates to a monitoring, analysis and early warning system of grid operation status.

Background technique

The safe and stable operation of the power grid is affected by many factors such as the operation mode of the power grid, the power flow situation, and the status of equipment. For dispatching work, how to grasp these information in a timely, intuitive and accurate manner is very important. At present, the dispatching automation systems used in the market all adopt the integrated system of prefecture, county or even province, prefecture and county, and the data server is also the same server, and the user is not only for dispatching, which has the following disadvantages:

1. Broad but not precise. Since the target users are not single and the scope is too wide, it is impossible to completely start from the actual situation of local dispatching and operation, and centralize the functions required for dispatching.

2. The visual interface function is lacking. The abnormal operation mode of all substations cannot be intuitively reflected from one interface, and the dispatcher needs to click on the substations one by one to understand.

3. Weak developability and difficult post-maintenance. On the one hand, the security of the database is not guaranteed, and there are many restrictions on development users; on the other hand, function redevelopment and post-maintenance are too dependent on manufacturers, and the cost and maintenance costs are too high, and the desired functions may not be guaranteed to be realized.

Contents of the invention

The invention mainly solves several problems: 1) Realize the complementarity with the existing system, and integrate the functions required for dispatching; 2) Realize the centralized and visualized interface, which can reflect the main network frame of the power grid intuitively and in real time from one interface Abnormal operation mode, abnormality, early warning, etc.; 3) Intelligent identification of main transformer N-1, auxiliary processing function, comprehensive analysis of reactive power and voltage, SMS alarm function; 4) Easy post-development and maintenance.

The technical solution of the present invention: a system for monitoring and analyzing the operation status of the electric power grid, which includes a collection client, a terminal server and a data storage, wherein the collection client obtains its 220KV power transformation equipment by connecting to each power transformation equipment in an area Reactive voltage, stable limit, 220KV main transformer N-1 state or grid abnormal state signal, and connected to the terminal server, the data storage is connected to the terminal server, and its improved design lies in: further including connection with the collection client A data collection node, which includes a signal transceiver for receiving the signal in a set area around it; a geographic information processor for confirming the position of the new substation equipment in the set area information; a signal controller, which is used to perform data processing on the signals from all the substation equipment in the preset area; wherein, the signal transceivers are respectively connected to the signal controller and the geographic information processor, and transmit and receive signals through The controller obtains several signals in the set area, and determines the position information of the signal through the maximum value of the signal strength in the geographic information processor, and then processes the received signal through the signal controller and passes the signal signal The transceiver sends to the acquisition client.

In an embodiment of the power system grid operation state monitoring and analysis system, the data acquisition node acquires the signal from the new substation equipment through the known substation closest to the geographical location of the new substation equipment The equipment is obtained in a power line carrier or wireless manner, wherein the geographical location information of the known power transformation equipment is preset in a readable storage medium of the geographical information processor.

In an embodiment of the system for monitoring and analyzing the operating state of the electric power grid, it further includes an output device for visually displaying the data from the data collection node.

In an embodiment of the system for monitoring and analyzing the operation state of the power grid, the geographical information processor is composed of a GPS receiver and a processing chip.

In an embodiment of the power system grid operation state monitoring and analysis system, the improved design of the terminal server includes: a processor designed to:

Obtain the reactive power and active power values from the data collection nodes, via To determine the reactive voltage state of the substation equipment, where λ is the power factor, P active power value, Q reactive power value; at least monitor the stability of the grid transmission line, the loss of the grid transmission line or the energy efficiency of the grid transmission line, according to 220kV Main transformer N-1 status analysis for classification processing, wherein the classification processing includes category 1 meeting N-1, category 2 not meeting N-1, overcurrent multiple of 1-1.3, and category 3 overcurrent multiple of 1.3-1.5 , Category 4 is over 1.5 times.

Description of drawings

Fig. 1 is a structural principle block diagram of the system of the present invention.

Detailed ways

Fig. 1 is the main block diagram of the system, which schematically depicts the monitoring and analysis system of power grid operation status, which includes a collection client 1, a terminal server 2 and a data storage 3. The acquisition client 1 obtains the reactive voltage, stability limit, 220KV main transformer N-1 status or grid abnormal status signal of the 220KV substation equipment by connecting to each grid substation equipment in an area, and connects to the terminal server 2 , the data storage 3 is connected to the terminal server 2, and further includes a data collection node 4 connected to the collection client 1, which includes a signal transceiver 41 for receiving the signal in a set area around it; A geographic information processor 42 is used to confirm the position information of the new power transformation equipment in the set area; a signal controller 43 is used to control the signals from all the power transformation equipment in the preset area Carry out data processing; Wherein, signal transceiver 41 is connected to signal controller 43 and geographic information processor 42 respectively, obtains several signals in the described setting area by signal transceiver 41, passes through the signal in geographic information processor 42 The position information of the signal is determined by the maximum value of the intensity, and then the received signal is processed by the signal controller 43 and sent to the collection client 1 by the signal transceiver 41 .

In one embodiment, the data acquisition node 4 acquires the signal from the new power transformation equipment through the power line carrier or wireless method at the known power transformation equipment closest to the geographical location of the new power transformation equipment , wherein the geographic location information of the known power transformation equipment is preset in a readable storage medium of the geographic information processor 42 .

In one embodiment, it further includes an output device 5 for visually displaying the data from the data collection node 4 .

In one embodiment, the geographic information processor 42 is composed of a GPS receiver and processing chip. In one embodiment, on the geographical wiring diagram, through multi-state variables and automatic identification of the switch knife state, corresponding alarm thresholds of different degrees are set for the lines, and different situations are distinguished by colors. If there is a line out of service It is white, the line overload is yellow and flashes, etc., to realize the display of abnormal modes and abnormal conditions of 220kV lines, 220kV power plants and substations and subordinate substations. It also integrates the stability limit setting monitoring module, main transformer N-1 alarm, intelligent analysis, power limit total calculation module, and 220kV substation reactive power and voltage monitoring module. The storage and re-reading realize the inquiry of the specific situation. This design has the following advantages:

1) Although the currently used monitoring system has monitoring functions, different functions are distributed in different sub-interfaces, and the data of each sub-interface cannot be monitored in real time on the same main interface, so only one interface data can be monitored at a certain time.

2) It is possible to view the operation status and load overload of each transformer connection line in real time and intuitively. When the power grid is abnormal, the dispatcher can know it in time; at the same time, the different situations of the power grid operation are distinguished by color, so that the dispatcher is aware of the current safe operation of the power grid. It is more obvious at a glance.

3) Avoid unclear or omission of power grid operation mode handover during shift handover.

The N-1 state analysis of the 220kV main transformer is divided into 4 categories, category 1 meets N-1, category 2 does not meet N-1, the overcurrent multiple is 1-1.3, and the overcurrent multiple of category 3 is 1.3-1.5. Category 4 is over 1.5 times. And according to the allowable overcurrent multiple of each main transformer and the corresponding allowable overcurrent time, the strategy is given. According to the analysis results, if it exceeds 1-1.3 times, yellow flashes, 1.3-1.5 times pink flashes, and the 220Kv switch status, main transformer load and capacity of each main transformer are displayed at the same time. When N-1 actually occurs, it can recall and record before N-1 The multiple of the initial load, and display the sustainable time after N-1, and the sustainable time can be automatically counted down and displayed.

When the main transformer is seriously overloaded and needs to limit the power, you only need to check the relevant lines in the emergency power limit sequence table to add the total sum of the power limit, avoiding more or less power limit, and quickly provide the total sum through calculation The load goes to the dispatcher for incident handling. Auxiliary dispatchers deal with such faults urgently. When the main transformer N-1 occurs, on the premise of ensuring the stability of the power grid and avoiding the overload of operating equipment, the refinement of power rationing can be realized to the greatest extent and unnecessary power outage losses can be avoided.

At present, the dispatching automation system also provides the main transformer N-1 monitoring function, but it lacks the analysis of the overload degree of the main transformer N-1, the duration of the overload and the power reduction strategy. In summary, the main transformer N-1 monitoring method provided by the present invention has the following advantages:

1) Briefly reflect the N-1 conditions of each 220kV main transformer, the severity of overload and the continuous operation time of different types of main transformers;

2) When the main transformer is not allowed to be overloaded or the main transformer N-1 is faulty, a power-limiting strategy is provided to help the dispatcher quickly control the load, effectively ensuring the reliable and stable operation of the power grid and the safety of the equipment.

The outage of certain lines, main transformers and other equipment in the main grid frame (220kV/500kV) of the power grid may cause overloading of other operating equipment, exceeding the specified safety and stability limit, which will greatly test the safe and stable operation of the power grid. It is necessary to be able to provide risk warning under certain circumstances. Different maintenance operation modes correspond to different control strategies and different limits. At present, it needs to be added by automation personnel in the monitoring system, which lacks flexibility and autonomy. When the personnel are busy or the mode changes due to failure at night, the monitoring limits cannot be added or updated in time. By reading the measuring points in the Haixun database, use VB programming to realize the free setting of the stable limit monitoring content and algorithm.

The current system only has a single monitoring function for the reactive power and power rate of the substation, and there are deficiencies in the alarm and decision-making functions. At the same time, the AVC system also has defects in the control strategy, causing some 220kV substation power rate assessment points to be inconsistent. qualified. Therefore, it is necessary to provide on-duty dispatchers with a set of monitoring system specifically for reactive power and voltage of 220kV substations. When the power rate assessment fails, it can accurately give alarm information, and at the same time remind the dispatcher to take countermeasures in time to ensure the power rate , The voltage returns to the qualified range. At the same time, it is required to realize the display of capacitor switching times and the SMS alarm function of abnormal power rate for a long time. The functions of this module are as follows: 1) Reactive power and power rate monitoring 2) Force rate alarm judgment 3) Capacitor action times display 4) Over-limit duration and qualification rate statistics 5) Voice alarm 6) Long-term voltage force rate crossing line SMS reminder 7 ) Historical alarm record query 8) Statistical report query 9) Floating curve display and other functions.

Among them, the number of actions of the capacitor can display the number of actions of the capacitor in one day. When the maximum number of times is reached, the AVC will be locked, and the controller will be reminded to strengthen monitoring and adjust manually.

In one embodiment, through the text message function, the software can automatically send the customized alarm information to the selected personnel. If there is a special need, the manual sending function can also be used to send the content of the manually prepared short message to the selected personnel.

In one embodiment, the system architecture can be divided into multiple layers such as acquisition layer, communication layer, data layer, and application layer, each of which undertakes different functions. In order to realize the collection of a large amount of real-time data of the power grid, the present invention adopts Haixun database, client tools and Visual Basic as development tools. Haixun real-time database provides clear and accurate power grid measurement point data, and at the same time uses the client development function that fully complies with the Microsoft Windows user interface standard to realize the development of special needs of users.

In one embodiment, the client (main interface) can increase and modify the line and main transformer quotas through the main transformer setting and line setting buttons, and store them in the original database EXCEL form. When there is a stable quota requirement, select the corresponding The device can edit the calculation formula according to the needs, and the structure is output to the client (main interface) for display.

In one embodiment, the program reads the reactive power and active power values of the 220kV side of each transformer from the database, according to Where λ is the power factor, P is active, and Q is reactive. When the calculation result is unqualified, the sound and light alarm will remind the dispatcher, and the short message will be sent to the relevant personnel. The dispatcher can check the specific situation on the interface, such as the number of groups, times, and unqualified time of capacitor switching to determine whether it is enough for manual intervention and switching. Which set of capacitors to return.

For example, on an OLED display 5 , purple, blue, and red can respectively represent lines of different voltage levels, white is inactive state, and yellow is abnormal. Switches are arranged on both sides of each substation (for example, represented by a circle) and the tie line between substations. The switch quantity is set as multi-state quantity and the normal state is set as the initial state quantity. The switch state directly reads the real-time switch state of Haixun database. Refresh every five minutes (can be set shorter), when the switch state changes and is inconsistent with the initial state quantity, the switch flashes. If the position of the switch between the two substation sides is abnormal, the switch changes color and flickers. The abnormal mode of each substation is realized by retrieving the status of all switch positions in the substation. When there is a discrepancy with the initial status, the color of the substation on the main interface will change to yellow.

Another embodiment of the present invention provides a monitoring and analysis system for power grid operation status, which is used to obtain reactive power voltage, safety limit, 220KV main transformer N- 1 state or power grid abnormal state signal, its monitoring and analysis methods include:

Collecting several signals of substation equipment in a set area in a wireless connection through the data collection node 4;

The geographic information processor 42 is compared with the parameter values of these several signals to obtain the position information of a signal with a maximum intensity value;

Send a request command to the known substation equipment closest to the geographical position where the signal is located by the signal controller 43, to obtain the signal of the new substation equipment;

Obtain the data information carried in the signal of the new power transformation equipment through the signal controller 43, and send it to the collection client 1;

The data is processed and stored by the acquisition client 1, and a record of the new substation equipment and its geographic location is established and sent to the terminal server 2.

In one embodiment, the data acquisition node 4 includes a signal transceiver 41 for receiving the signal in a set area around it; a geographic information processor 42 for confirming new changes in the set area The location information of the electrical equipment; the signal controller 43 is used to perform data processing on the signals from all the electrical transformation equipment in the preset area; wherein, the signal transceiver 41 is respectively connected to the signal controller 43 and the geographical information Processor 42.

Claims (2)

1. Power system grid operation status monitoring and analysis system, including acquisition client, terminal server and data storage, in which the acquisition client obtains the reactive power voltage, stability and Limit, 220KV main transformer N-1 state or power grid abnormal state signal, and connected to the terminal server, the data storage is connected to the terminal server, and it is characterized in that: it further includes a data collection node connected to the collection client, which Including a signal transceiver, used to receive the reactive voltage of the 220KV substation equipment, safety limit, 220KV main transformer N-1 state or abnormal state signal of the power grid in a set area around it; a geographic information processor , used to confirm the position information of the new substation equipment in the set area; a signal controller, used to control the reactive voltage of the 220KV substation equipment from all the substation equipment in the set area, Data processing of stable quota, 220KV main transformer N-1 state or abnormal state signal of power grid; among them, the signal transceiver is respectively connected to the signal controller and the geographic information processor, and the signal transceiver obtains a number of data in the set area. A signal, the location information of the signal is determined by the geographic information processor corresponding to the maximum value of the signal strength, and then processed by the signal controller The received signal is sent to the acquisition client through the signal transceiver; The data acquisition node obtains the signal of the new substation equipment through the known substation equipment closest to its geographic location by means of power line carrier or wirelessly, wherein the geographic location information of the known substation equipment is preset in a readable storage medium of the geographic information processor; It also includes an output device connected to a terminal server for visually displaying the data from the data collection node; The geographic information processor is composed of a GPS receiver coupled with a processing chip; The terminal server includes: a processor designed to: obtain reactive power and active power values from data collection nodes, through To determine the reactive voltage state of the substation equipment, where λ is the power factor, P active power value, Q reactive power value; at least monitor the stability of the grid transmission line, the loss of the grid transmission line or the energy efficiency of the grid transmission line, according to 220kV Main transformer N-1 status analysis for classification processing, wherein the classification processing includes category 1 meeting N-1, category 2 not meeting N-1, overcurrent multiple of 1-1.3, and category 3 overcurrent multiple of 1.3-1.5 And the overcurrent multiple of category 4 is over 1.5 times. 2. A monitoring and analysis system for power system grid operation status, used to obtain 220KV substation equipment reactive voltage, safety limit, 220KV main transformer N‐1 status or grid abnormal status signal in a region from the acquisition client, It is characterized in that the monitoring and analysis method includes: Collect several signals of substation equipment in a set area through wireless connection through data acquisition nodes; The geographic information processor is compared with the parameter values of these several signals to obtain the position information of a signal with a maximum intensity value; Send a request command to the known substation equipment closest to the geographical location of the signal through the signal controller to obtain the signal of the new substation equipment; Obtain the data information carried in the signal of the new power transformation equipment through the signal controller, and send it to the collection client; Process and store the data through the acquisition client, create a record of the new substation equipment and its geographic location, and send it to the terminal server; The data acquisition node includes a signal transceiver for receiving the reactive voltage of the 220KV substation equipment, safety limit, 220KV main transformer N-1 state or abnormal state signal of the power grid in the set area around it; The information processor is used to confirm the position information of the new substation equipment in the set area; the signal controller is used to control the reactive power of the 220KV substation equipment from all the substation equipments in the set area. Voltage, stability limit, 220KV main transformer N-1 state or abnormal state signal of power grid for data processing; among them, the signal transceiver is connected to the signal controller and geographic information processor respectively.