WO2008144860A1 - Remote monitoring and control system of voltage regulators - Google Patents

Remote monitoring and control system of voltage regulators Download PDF

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Publication number
WO2008144860A1
WO2008144860A1 PCT/BR2007/000327 BR2007000327W WO2008144860A1 WO 2008144860 A1 WO2008144860 A1 WO 2008144860A1 BR 2007000327 W BR2007000327 W BR 2007000327W WO 2008144860 A1 WO2008144860 A1 WO 2008144860A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage regulators
control system
voltage
characterized
remote
Prior art date
Application number
PCT/BR2007/000327
Other languages
French (fr)
Inventor
Anderson Takemitsu Kubota
Martin Alsina Navarro
Moises Pezzi Godinho
Original Assignee
Siemens Ltda
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BRPI0705236 priority Critical patent/BRPI0705236A2/en
Priority to BRP10705236-7 priority
Application filed by Siemens Ltda filed Critical Siemens Ltda
Publication of WO2008144860A1 publication Critical patent/WO2008144860A1/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/0006Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks
    • H02J13/0013Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0017Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with direct transmission between the control or monitoring unit and the controlled or monitored unit
    • H02J13/0075Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network for single frequency AC networks characterised by transmission structure between the control or monitoring unit and the controlled or monitored unit with direct transmission between the control or monitoring unit and the controlled or monitored unit using radio means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/70Systems integrating technologies related to power network operation and communication or information technologies mediating in the improvement of the carbon footprint of electrical power generation, transmission or distribution, i.e. smart grids as enabling technology in the energy generation sector
    • Y02E60/78Communication technology specific aspects
    • Y02E60/7807Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y02E60/7853Communication technology specific aspects characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/10Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by communication technology
    • Y04S40/12Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by communication technology characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126Using wireless data transmission

Abstract

The present invention refers to a system which shows a wireless and cableless connection solution for remotely monitoring and controlling several parameters of voltage regulators associated to an electrical power distribution network. Thus, a remote monitoring and control system of voltage regulators is described, comprising at least one remote terminal (300) remotely interacting with at least one voltage regulators bank (200) through a central station (100), the voltage regulators bank (200) being associated to at least one electrical power distribution network, the voltage regulators bank (200) being provided with at least one voltage regulator (201 ) reachable by the remote terminals (300) through the central station (100) at of at least one wireless network provider (400).

Description

Title: "REMOTE MONITORING AND CONTROL SYSTEM OF VOLTAGE REGULATORS".

Field of the invention

The present invention refers to a remote monitoring and control system of voltage regulators of an electrical power distribution network. More particularly, the present invention refers to a system which presents a wireless and cableless connection solution for remote monitoring and controlling several parameters of voltage regulators associated to an electrical power distribution network. Description of the prior art Voltage regulators

In electrical power distribution and transmission networks it is necessary to keep the voltage supplied to the user within a tolerance interval, that is, to supply a constant voltage tolerating minimal variations. This voltage is in the order of kV and the values such as 7.97 kV, 13.8 kV, 19.9 kV or 34.5 kV are commonly used.

To keep the voltage supplied to user constant, transformers or autotransformers provided with a switch under load are used, which will be named voltage regulators, allowing the correction of the voltage automatically according to a pre-adjusted value, without an interruption in the power supply taking place.

The voltage regulator comprises coils provided with derivation or taps and switches under load, whose function is to select a desired tap t- hrough the displacement of mobile contacts over fixed contacts. This displa- cement requires a mechanical actuation provided by an electrical engine, gears and other secondary components. The command for such actuation is performed through an electronic panel installed at the voltage regulator, in which the position of the mobile contacts (at the desired tap) can be programmed in order to obtain the previously defined output voltage. The control system for the voltage regulator is automatic: the electronic control panel receives a signal of the measured parameter values from the voltage regulator and, according to the dedicated software routines (installed in the control panel), executes a command for the mechanical actuation, increasing or decreasing the output voltage of the regulator.

Such electronic control panel further comprises an internal memory which stores the information relating to the previous events of the actu- ation of the switch. This information is of great importance for the study and analysis of the events which took place prior to the actuation of the switch. For example, from these data, the causes which originated a specific problem in the electrical distribution of a given region can be disclosed. The stored information in the electronic control panel also may be used for perfor- ming the adjustment of the control parameters of the voltage regulators.

Lastly, in the electronic control panel the amount of operations which the switch of the voltage regulator effected up to a determined instant is also indicated. This amount determines the necessity of maintenance in the switch, as the switch contacts have a determined shelf life defined by the amount of operations performed (switches under load require periodical maintenance for the replacement of the electrical contacts which become deteriorated by use). Disadvantages of the Present System

Presently, the electronic control panel is locally monitored and controlled (on a manual manner or by a computer connected by cable) or remotely through a common or optical fiber cable connected to a remote external device. Furthermore, many voltage regulators are installed at places where the physical access is difficult, characterizing thus, a high implementing cost for a remote monitoring and control system. Usually, voltage regulators are installed at power distribution centrals or along the power distribution networks (lines). These places can be far from the monitoring and control centers of the power distribution system, at relatively long distances. Thus, the operator which is responsible for the collection of the information and/or adjustment must be displaced to the place at which the voltage regulator is installed.

This need for the displacement of the operators generates costs and transport drawbacks, accident risk and time waste. Furthermore, the de- lay in the availability of the necessary data at the monitoring and control system center harms the quality of the service causing customer dissatisfaction, mainly in emergency cases, the situation may be aggravated by this delay. In these cases, the rapid access to the data stored at the memory of the control panel is essential to solve power distribution problems. Objective of the Invention

The objective of the present invention is to provide a remote monitoring and control system of voltage regulators, at low implementation cost, able to allow rapid access to the data of the control panel of the voltage regu- lator to assist customers at a reduced time, mainly in emergency cases. Summary of the invention

The objective of the present invention is achieved by the provision of a remote monitoring and control system of voltage regulators comprising at least one remote terminal remotely interacting with at least one volta- ge regulators bank through a central station, the voltage regulators bank being associated with at least one electrical power distribution network, the voltage regulators bank provided with at least one voltage regulator accessible by the remote terminals through the central station and at least one wireless network provider. Brief description of the figures

The present invention will be described as follows in more detail, with reference to the annexed drawings, in which:

Figure 1 - represents an embodiment of a remote monitoring and control system of voltage regulators, object of this invention; Figure 2 - represents an embodiment of the voltage regulators bank comprising two sets of voltage regulators, each one formed by three voltage regulators. Detailed description of the invention

Figure 1 illustrates a remote monitoring and control system of voltage regulators comprising at least one central station 100, a voltage regulators bank 200, a remote terminal 300 and a wireless network provider 400. Voltage Regulators Bank The Voltage Regulators Bank 200, associated to at least one e- lectrical power distribution network (not shown), comprises at least one wireless communication device 202 and a voltage regulator 201 which communicate with each other for the exchange of data and information of input and output of the voltage regulators bank 200. The output data is that aimed at client monitoring. The input data is that used for the control of the parameters of the voltage regulator 201.

The voltage regulator 201 comprises all the characteristics already described in the state of the art, such as a control panel 203 provided with a memory for the storage of data of sequential and instantaneous events of the parameters of the voltage regulator 201. However, this control panel 203 aggregates an additional function, which is the capacity of communicating with the wireless communication device 202 through a signal divider module internally placed in the wireless communication device 202. The wire- less communication device 202 is of the plug and play type, what eases the installation thereof in the voltage regulator 201 , being enough to connect the wireless communication device 202 to a serial port of the control panel 203. The wireless communication device 202 communicates with the central station 100 through a high range wireless technology provided by the wireless network provider 400, which, by its turn, connects the remote terminal with the voltage regulators bank 200. This wireless and cableless configuration eases the installation and maintenance of the voltage regulators 201 , reducing maintenance and client transportation costs.

The voltage regulators 201 is reachable through the central stati- on 100 that, by its turn, is reachable by remote terminals 300 through the internet, and, thus, the voltage regulator 201 may be monitored and controlled (parameterized) by remote terminals 300. The monitoring allows the diagnosis of the voltage regulators 201 and of the electrical power distribution network associated thereto, the analysis of events at a determined time interval to prevent possible failures that may occur in the future through an adequate control being possible.

Figure 2 illustrates another possible configuration of the voltage regulators bank 200, comprising two sets of voltage regulators 204, each one formed by three voltage regulators 201. However, it is not necessary any wireless communication device 202 exclusive to each voltage regulator 201 , being necessary only one wireless communication device 202 to access all voltage regulators 201 comprised by the voltage regulators bank 200. Optionally, it is possible the use of only one control panel 203 to control each set of voltage regulators 204, thus providing a significant reduction in costs. Wireless Network Provider

The wireless network provider 400 allows the communication between the central station 100, the voltage regulators bank 200, and the remote terminals 300. Such wireless network provider 400 may be represented by a previously enabled cell phone operator. Preferably, but not compul- sorily, this communication is implemented through a GPRS technology of a GSM type network provided by a cell phone operator. Other types of techno- logies and wireless communication networks may be used, as long as they are suitable to the data transfer of this application. However, GPRS technology offers several advantages such as a high data transfer rate and economy in costs to the client, as, instead of the customer paying for the connection time with the voltage regulator, he may opt to pay for the amount of transferred data or for a pre-established fixed cost. Thus, the wireless communication device 202 allows the direct communication of the voltage regulator 201 with the central station 100 through GPRS technology of the GSM network of the wireless network provider 400 (cell phone operator).

The elimination of communication cables eases and simplifies the implementation of this system, inasmuch as being low cost. Other cabled technologies (for example, serial, dialed line, among others) generate a high cost and a higher difficulty in installation, mainly if the remote places with difficult access where the regulators are installed are considered, further to not offering the same performance level and functionalities of the wireless soluti- on disclosed in this invention. The reduction in the implementation cost is also due to the fact that several remote terminals use the same server infrastructure, internet links, software and GSM network (GPRS). Central Station

The central station 100 is able to access the control panel 203 of the voltage regulator 201 allowing the remote monitoring and control of the parameters of the voltage regulator 201 by the remote terminals 300. Such central station 100 comprises at least one application server 101 , a first router 102, a firewall 103 and a second router 104 associated to each other, as illustrated in figure 1. The function of the application server 101 is to store data and to communicate with the first and second routers 102, 104. The first router 102 communicates with the remote terminals 300 to allow the access of customers to the application servers 101. The second router 104 communicates with the voltage regulators bank 200, preferably, through GPRS technology of GSM network of the wireless network provider 400. The firewall 103 has the function of offering protection and safety to the application server 101 , so that no unauthorized person may access the vol- tage regulators 201. Thus, the firewall 103 assures that every data from the regulator are transmitted by a safe data channel, without the danger of interception of the signal by third parties.

The implementation of a central station 100 eliminates the necessity of the installation of operation terminals (computers) at the places of the electrical substation so that customers may connect thereto in order to perform the remote monitoring and control of the voltage regulators. Therefore, in grand scale, there is a considerable cost reduction, also avoiding the concentration of a considerable number of equipment in one place, simplifying the operation, control and maintenance of the very system as a whole. Remote Terminals

The remote terminals 300 may remotely access the central station 100 through the public internet network. Thus, any user (customer) authorized which has access to the internet by any suitable remote terminal 300 (desktop computer 302, laptop computer 303, cell phone, PDA, computer able to use GPRS 301 , etc.), may monitor and control the voltage regulators 201 at any place in the world, at any time. In the remote terminal 300 it should be installed a software able to execute the monitoring and control rou- tines of the voltage regulators 201. This software, when initiated by the customer through the equipment thereof, will open a connection (link) with the application server 101. The application server 101 is accessed by the remote terminals 300 through a specific IP number, which represents the address of the application server 101 in the internet. The central station 100 will allow the connection of the customer with the voltage regulator 201 through the second router 104, which will direct the access to a specific port for the voltage regulator 201.

Thus, the central station 100 is able to receive the request of the customer through the first router 102 and able to direct the connection of the customer with the desired voltage regulator 201 through the second router 104 (each voltage regulator 201 is associated to a specific port of the central station 100). After the effecting of the connection, the customer will have full access to the voltage regulator 201 through the regulator software. Such access allows the customer the reading of the data stored at the memory of the control panel 203 (for example, information for maintenance) and of the data in operation of the control panel 203 (for example, the position of the switch, the voltage of the source and the charge voltage of the voltage regulator 201 ). Furthermore, it is also possible the parameterization of the data of the control panel 203 to control the voltage regulator 201. The access to information for maintenance eases the planning thereof, as the data and parameters of the voltage regulators 201 may be accessed quickly in real time, avoiding delays and lateness which difficult a more correct and precise planning. The quickness of implementation is an important characteristic of this system. There is no longer the need for the customer to set up an infrastructure to have access to the system. It is necessary only to provide a conventional access to the internet, be it by dialed line, ADSL, GSM (GPRS) or, further, by a private IP network (for example, intranet) to access the applica- tion server 101 and to connect to anyone of the voltage regulators 201 in field.

A preferred embodiment example having been described, it must be understood that the scope of the present invention encompasses other possible variations, being limited only by the contents of the appended claims, where possible equivalents are included.

Claims

1. Remote monitoring and control system of voltage regulators, characterized in that it comprises at least one remote terminal (300) remotely interacting with at least one voltage regulators bank (200) through a central station (100), the voltage regulators bank (200) being associated to at least one electrical power distribution network, the voltage regulators bank (200) provided with at least one voltage regulator (201) reachable by the remote terminals (300) through the central station (100) and of at least one wireless network provider (400).
2. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the communication of the remote terminals (300) with the voltage regulator (201) is implemented through a GPRS technology of a GSM type network of the wireless network provider (400).
3. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the remote terminals (300) access the central station (100) through the public internet network.
4. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that a direct communication of the cen- tral station (100) with the voltage regulator (201 ) is carried out through a G- PRS technology of a GSM type network of the wireless network provider (400) by means of commands of the remote terminals (300).
5. Remote monitoring and control system of voltage regulators, according to claim 4, characterized in that the direct communication of the central station (100) with the voltage regulator (201) is carried out through at least one wireless communication device (202) and through GPRS technology of the GSM type network of the wireless network provider (400).
6. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the voltage regulator (201) compri- ses at least one control panel (203) provided with a memory, said memory being able to store data from sequential events of the parameters of the voltage regulator (201).
7. Remote monitoring and control system of voltage regulators, according to claim 6, characterized in that the central station (100) is able to access the control panel (203) of the voltage regulator (201 ) to allow the monitoring and control of the parameters of the voltage regulator (201 ) by the remote terminals (300).
8. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the central station (100) comprises at least one application server (101 ), a first router (102), a firewall (103) and a second router (104) associated to each other, the application server (101 ) being able to store data and to communicate with the first and the second routers (102, 104), the first router (102) being able to communicate with the remote terminals (300), the firewall (103) being able to offer protection and safety to the application server (101) and the second router (104) being able to communicate with the voltage regulators bank (200) through a GPRS te- chnology of a GSM type network of the wireless network provider (400).
9. Remote monitoring and control system of voltage regulators, according to claim 8, characterized in that the remote terminals (300) are a- ble to access the application server (101) of the central station (100) through the first router (102).
10. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the remote terminals (300) are provided with a software able to execute routines for the monitoring and control of the voltage regulators (201).
11. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the voltage regulators bank (200) comprises at least one set of voltage regulators (204) associated to at least one wireless communication device (202).
12. Remote monitoring and control system of voltage regulators, according to claim 1 , characterized in that the wireless network provider (400) is a previously set cell phone operator.
PCT/BR2007/000327 2007-05-29 2007-11-30 Remote monitoring and control system of voltage regulators WO2008144860A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BRPI0705236 BRPI0705236A2 (en) 2007-05-29 2007-05-29 monitoraÇço system and remote control regulators tensço
BRP10705236-7 2007-05-29

Publications (1)

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WO2008144860A1 true WO2008144860A1 (en) 2008-12-04

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WO (1) WO2008144860A1 (en)

Cited By (10)

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EP2427949A2 (en) * 2009-05-07 2012-03-14 Virginia Electric and Power Company Voltage conservation using advanced metering infrastructure and substation centralized voltage control
CN102497025A (en) * 2011-12-20 2012-06-13 昆明电器科学研究所 Remote state monitoring method for automatic sectionalizer
CN102842914A (en) * 2012-08-02 2012-12-26 中国电力科学研究院 Energy storage power station monitoring system
US9325174B2 (en) 2013-03-15 2016-04-26 Dominion Resources, Inc. Management of energy demand and energy efficiency savings from voltage optimization on electric power systems using AMI-based data analysis
CN105610177A (en) * 2016-03-08 2016-05-25 宁波高新区鼎诺电气有限公司 Wireless intelligent compensation monitoring device, electric reactor, capacitor and system thereof
US9354641B2 (en) 2013-03-15 2016-05-31 Dominion Resources, Inc. Electric power system control with planning of energy demand and energy efficiency using AMI-based data analysis
US9367075B1 (en) 2013-03-15 2016-06-14 Dominion Resources, Inc. Maximizing of energy delivery system compatibility with voltage optimization using AMI-based data control and analysis
US9563218B2 (en) 2013-03-15 2017-02-07 Dominion Resources, Inc. Electric power system control with measurement of energy demand and energy efficiency using t-distributions
US9820061B2 (en) 2013-03-15 2017-11-14 Cochlear Limited Controlling a link for different load conditions
US9847639B2 (en) 2013-03-15 2017-12-19 Dominion Energy, Inc. Electric power system control with measurement of energy demand and energy efficiency

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Cited By (19)

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EP2427949A2 (en) * 2009-05-07 2012-03-14 Virginia Electric and Power Company Voltage conservation using advanced metering infrastructure and substation centralized voltage control
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EP2427949A4 (en) * 2009-05-07 2013-08-14 Virginia Electric And Power Company Voltage conservation using advanced metering infrastructure and substation centralized voltage control
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CN105449681A (en) * 2009-05-07 2016-03-30 道明尼资源公司 Voltage conservation using advanced metering infrastructure and substation centralized voltage control
CN102497025A (en) * 2011-12-20 2012-06-13 昆明电器科学研究所 Remote state monitoring method for automatic sectionalizer
CN102842914A (en) * 2012-08-02 2012-12-26 中国电力科学研究院 Energy storage power station monitoring system
US9354641B2 (en) 2013-03-15 2016-05-31 Dominion Resources, Inc. Electric power system control with planning of energy demand and energy efficiency using AMI-based data analysis
US9887541B2 (en) 2013-03-15 2018-02-06 Dominion Energy, Inc. Electric power system control with measurement of energy demand and energy efficiency using T-distributions
US9325174B2 (en) 2013-03-15 2016-04-26 Dominion Resources, Inc. Management of energy demand and energy efficiency savings from voltage optimization on electric power systems using AMI-based data analysis
US9367075B1 (en) 2013-03-15 2016-06-14 Dominion Resources, Inc. Maximizing of energy delivery system compatibility with voltage optimization using AMI-based data control and analysis
US9553453B2 (en) 2013-03-15 2017-01-24 Dominion Resources, Inc. Management of energy demand and energy efficiency savings from voltage optimization on electric power systems using AMI-based data analysis
US9563218B2 (en) 2013-03-15 2017-02-07 Dominion Resources, Inc. Electric power system control with measurement of energy demand and energy efficiency using t-distributions
US9582020B2 (en) 2013-03-15 2017-02-28 Dominion Resources, Inc. Maximizing of energy delivery system compatibility with voltage optimization using AMI-based data control and analysis
US9678520B2 (en) 2013-03-15 2017-06-13 Dominion Resources, Inc. Electric power system control with planning of energy demand and energy efficiency using AMI-based data analysis
US9820061B2 (en) 2013-03-15 2017-11-14 Cochlear Limited Controlling a link for different load conditions
US9847639B2 (en) 2013-03-15 2017-12-19 Dominion Energy, Inc. Electric power system control with measurement of energy demand and energy efficiency
US10274985B2 (en) 2013-03-15 2019-04-30 Dominion Energy, Inc. Maximizing of energy delivery system compatibility with voltage optimization
CN105610177A (en) * 2016-03-08 2016-05-25 宁波高新区鼎诺电气有限公司 Wireless intelligent compensation monitoring device, electric reactor, capacitor and system thereof

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