Geodesy

Evolutionary algorithm

Quantum mechanics

Benchmark (surveying)

Voltage

Engineering

Power (physics)

Computer science

Mathematical optimization

Evolutionary computation

Regression analysis

Physics

Mathematics

Test case

Geography

Electric power system

Mathematical analysis

Tree (set theory)

Optimization problem

Test suite

Machine learning

Multi-objective optimization

Electrical engineering

IEEE Transactions on Evolutionary Computation

Ratio error (RE) estimation of the voltage transformers (VTs) plays an important role in modern power delivery systems. Existing RE estimation methods mainly focus on periodical calibration but ignore the time-varying property. Consequently, it is difficult to efficiently estimate the state of the VTs in real time. To address this issue, we formulate a time-varying RE estimation (TREE) problem into a large-scale multiobjective optimization problem, where the multiple objectives and inequality constraints are formulated by statistical and physical rules extracted from the power delivery systems. Furthermore, a set of TREE problems from different substations is systematically formulated into a benchmark test suite for characterizing their different properties. The formulation of these TREE problems not only transfers an expensive RE estimation task to a relatively cheaper optimization problem but also promotes the research in large-scale multiobjective optimization by providing a real-world benchmark test suite with complex variable interactions and correlations to different objectives. To the best of our knowledge, this is the first time to formulate a real-world problem into a benchmark test suite for large-scale multiobjective optimization, and it is also the first work proposing to solve TREE problems via evolutionary multiobjective optimization.

Evolutionary Large-Scale Multiobjective Optimization for Ratio Error Estimation of Voltage Transformers