Multi-dimensional distribution network voltage collaborative estimation method using wavelet transform based multiscale analysis

Conventional methods for distribution network voltage estimation may encounter resource contention issues when performing noise reduction, harmonic calculation, and singular inspection. To address such problems, this study presents a wavelet transform based multiscale analysis (WT-MSA) method for achieving multifunctional integration of multi-objective collaborative voltage estimation in distribution networks. First, the basic concepts of multiscale space and wavelet function are described, mainly used for decomposing the original signal under different scales of wavelet spaces and then conducting filtering. Second, a voltage coordinated estimation method is established, with a marginal threshold function employed as the criterion for correcting wave coefficients. Following that, an interpolation-energy based method for gradually estimating both fundamental and harmonic effective information is developed. Finally, three different types of Cases are set up for simulation verification, demonstrating that the proposed method meets the accuracy requirements for voltage estimation in distribution networks.