Distribution Management

The Survalent ONETM Distribution Management System (DMS) is a fully integrated platform, with a wide-range of features including multiple redundancy and a single user interface. The features listed below are available for DMS systems.  Download brochure (pdf)

Network Model

The network model is defined using a graphical line section editor that is built into the SmartVU map editor. This editor allows the user to edit both the topology of the network and the parameters of the network elements.

Both the topology processor and the load flow calculations that use the network model support paralleled and looped networks as well as radial networks. There is no limit on the size of the network.

To make the load flow calculations as accurate as possible, the load modeling can be made to be sensitive to voltage, time of day, day of week and ambient temperature. These sensitivities are defined via load composition and load profile tables. To get a quick start, the user can begin with flat compositions and profiles and just use connected KVA or monthly billed KWH. Later, you can develop more complex load compositions and profiles to improve the accuracy of the model.

Topology Processor

The topology processor calculates the connectivity of line sections based on the topology of the network and the current status of the breakers and switches. For areas that are energized, the topology processor also indicates where the network is paralleled and/or looped. Since the system supports multiphase non-ganged switches, each phase may have different connectivity (phases within a line section may be fed from different feeders).

The status of the line sections are displayed on the map by user-defined color-coding. A feeder trace function allows the dispatcher to ask the system to highlight the extent of any feeder. Multiple simultaneous traces with different colors can be requested. Traces are local to a workstation (a trace on one workstation does not appear on other workstations).

Load Flow

Periodically, the system performs a three-phase unbalanced load flow calculation and database update that:

  • redistributes the feeder load data so that the total matches the substation data in the SCADA system
  • updates the feeder voltage/loss profiles
  • updates the feeder min/max margin and min/max volts data

The load flow calculations are performed automatically and displayed in reports:

  • at a periodic interval, where the interval is user-defined
  • whenever there is a significant change in the substation data (voltage, load) in the SCADA system database, where the definition of "significant" is user-defined
  • after a feeder reconfiguration has occurred (by switching action) or after the dispatcher has made some changes in the line sections database via the Line Section Editor

Security Analysis

A security analysis is automatically performed after load flow calculation, monitoring currents and voltages on all the line sections. Alarms are issued and all threats are listed on the display. This creates a warning system that notifies the dispatcher of impending overloads or poor voltage conditions. 

Studies and Reports

Numerous DMS studies and reports are displayed in the SmartVU interface. The studies cover: switching, load transfer alternatives, short circuit, post-fault load transfer, and capicitor dispatch. The reports include:  Line Section Data, Load Flow Data, Load/Customer, Voltage, Loss and Load Balance, Line Section, Capacitor and Regulator, Switching Devices, Load Margins, and Min/Max Voltage.

Fault Location, Isolation, and Service Restoration (FLISR)

Survalent FLISR helps operators minimize the downtime caused by outages that trip and lock out breakers in a distribution substation. The application rapidly identifies a fault or loss of supply in the network. Once the faulted section is known, the de-energized sections are re-supplied via switch orders. The service restoration process can be restored to customers on a manual, semi-automatic or automatic basis. Note: Survalent FLISR operates with or without load flow. 

Learn how Central Georgia EMC boosted reliability and customer satisfaction with Survalent FLISR.

Features

  • Fully integrates with Survalent ONETM SCADA and OMS
  • Easy deployment with no programming required
  • Fault location algorithm is based on analyzing the pattern of fault targets at fault indicators
  • Application can be enabled or disabled on a per feeder basis, or globally
  • FLISR program operations history is logged in the SCADA database
  • Automatic mode ensures the switch order is executed without operator intervention
  • Semi-automatic mode provides a switch order which isolates the fault and provides service restoration

>Benefits

  • Rapid isolation of system damage, and service restoration for customers
  • Reduced customer interruptions and improved SAIFI, SAIDI, and related indices
  • Compliance to regulatory and customer metrics
  • Lower field service costs

Volt/VAR Optimization

Survalent VVO/VAR is an advanced application designed to improve energy efficiency in the distribution system by reducing both energy losses and peak demand. It coordinates control of reactive power and voltage, to optimize user objectives subject to defined constraints. VVO performs optimization and issues controls at both the substation and feeder level. 

VVO determines the optimum control actions to achieve operator-specified operating objectives for:

  • Loss Minimization: reduce losses at transformers at substations, and at lines along the feeders.
  • Energy Conservation: reduce load by minimizing voltage throughout the network within constraints.
  • Revenue Maximization: maximize the difference between energy sales price and its cost to the utility.

Survalent VVO provides optimized control at the system level, surpassing control through local controllers. As a network-based solution, it addresses more system conditions than a rule-based algorithm.

Other Applications

Dynamic Voltage Regulation (DVR) Rotational Load Shedding (RLS)
Load Curtailment Short Term Load Forecasting
Load Estimation Voltage Reduction
Power Factor Control

Demand Response

Utilities leverage Survalent's Demand Response capabilities through three optional applications:  Dynamic Voltage Regulation (DVR), Load Curtailment, and Rotational Load Shedding (RLS). Each function is integrated on the SCADA host, and accessible through the SmartVU interface. 

  • Dynamic Voltage Regulation:  performs conservation voltage reduction (CVR) and other actvities, to reduce peak demand and manage optimal feeder voltage limits. DVR automatically adjusts the voltage regulator set points and/or transformer tap positions, to maintain the voltage profile within the objective limits, while avoiding the need for complex programming.
  • Load Curtailment:  employs a high-level "supervisory" program to monitor conditions on your system, and determine when, and how, load shedding will be performed. It uses a low-level "executive" program to execute the strategies, and perform controls to achieve the desired load shedding objectives.
  • Rotational Load Shedding:  enables utilities to plan, manage, and automate a load shedding program. RLS reduces the total load via rotational load connection, and disconnection (i.e. rolling blackouts). It maintains the accounting of load shedding capacities and load shedding operations, and ensures lower priority loads are shed before higher ones. 

Short-term Load Forecasting

This application is based on matching historical load and weather data. The editor accomodates allows hourly weather forecasts (up to 24 hours), and daily forecasts (up to a month). To produce the forecast, an algorithm takes the five best historical matches, and averages the resulting load curves.

  • Load Estimation:  leverages the scheduled load forecasts to continually estimate the present value of the load point. By means of a special calculation function, the estimated value can be used to substitute actual telemetered values during periods where telemetry has failed. Note:  Load Estimation requires a separate license.

Power Factor Control

The Power Factor Control feature in Windows SCADA is responsible for monitoring and correcting the power factor at specific locations within the power system. These locations represent specific "billing points", where power is supplied to the system. Typically, the locations have telemetry of real and reactive power. Some locations include the power factor, which is of high importance to the user.

Voltage Reduction

Voltage Reduction automatically lowers and raises your voltage regulators, to achieve voltage reductions in accordance with supervisory logic you provide.

DMS Interfaces and Protocols

Advanced Metering Infrastructure Interface (AMI) Network Database Access API
Inter Control Center Communication Protocol (ICCP) GIS Interface
MultiSpeak