Software modules

Distribution state estimator

As distribution systems are becoming more interconnected and complex, their efficient planning and operation require an accurate and trustworthy power flow solution obtained from a detailed electrical model with its inherent share of imprecision.

Eaton's CYME Distribution State Estimator module features a refined algorithm which takes detailed network modelling to a newer level by being able to process various measurements in order to estimate the power flow and voltages of the system. The module analyses the unbalanced power flow and the voltages at every level of a distribution power system and uses a rigorous mathematical formulation which works for all distribution system topologies (radial, looped, meshed), including heavily-meshed systems such as secondary grid networks. The details provided by the module help the distribution engineer design the best solution to the problems identified. The module is seamlessly integrated to the CYME software framework, making it easy to use the results for other CYME software simulations and for adjusting settings on the distribution model.

Distribution state estimator module

General

The CYME Distribution State Estimator module can:

Estimate unbalanced load and power flow
Process various types of by-phase measurements (volts, amps, kW, kVAR) with user-specified precisions
Handle measurement redundancy
Estimate voltage regulator and transformer on-load tap-changer tap position
Include distributed generation
Provide quality index solutions
Cleanse the data, based on user-defined rules, to remove bad data prior to the analysis
Perform load initialisation in preparation of distribution system analysis (capacity analysis, volt-VAR optimisation, contingency analysis, etc.)
Assist with identification of potential errors in topology and measurements (switches state, shunt capacitor state, tap position, etc.)

State estimation for secondary grid networks

The Distribution State Estimator analysis is based on a rigorous mathematical formulation that can handle large interconnected systems. This robust algorithm makes the state estimation of heavily meshed systems, such as secondary networks, possible. Load values can be estimated while low-voltage cable currents can be calculated for increased grid awareness.

Voltage measurements

Unlike traditional algorithms such as power flow and load allocation, the Distribution State Estimator takes into account by-phase voltage measurements, along with other traditional measurements (amps, kW, kVAR). A voltage meter can be installed at any node of the distribution system model.

Meaningful results

The Distribution State Estimator analysis module includes several detailed reports that can be further customised by the user. They provide insights on the solution by tabulating meaningful results such as estimated load values, meter measurements and calculated meter values. A series of quality indices is also available to help the engineer assess the accuracy of the solution:

Normalised residuals
Weighted residuals
Normalised Lagrange multipliers
Solution cost
Measurement mismatches

Eaton’s CYME Distribution State Estimator module features a refined algorithm that processes various measurements in order to estimate the power flow and voltages of the system.

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Need product support?

CYME user portal: my.cyme.com

P: 450 461 3655 or 800 361 3627 (Canada and USA)

E: cymesupport@eaton.com

Questions before you buy

E: cymeinfo@eaton.com

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