研究成果

Intelligent Energy Management System

• By integrating photovoltaic energy, storage system, fuel cell, and different kinds of electronic loads, the proposed intelligent energy management system can be easy to regulate the power flow between the generation and load demand and implement the energy-saving strategy in the microgrid system.

Expert System for Fault Protection in Microgrid

• The required features for the identification can be reduced. In this way, the complexity of neural network-based classifier can be simplified and then the hardware requirements for the implementation will also be mitigated.

• The noise interference can be effectively removed due to the fuzzy inference.

• The dominant features for the identification of power disturbance can be enhanced and the recognition accuracy would be increased.

• According to the revisions of IEEE Std. 1159-2019], the identification mechanism of proposed fault protection system can be easily and flexibly adjusted without taking hardware requirements into account.

Virtual Multifunction Power Quality Analyzer

• By integrating different kinds of PQ analyzers with ADALINE-based method, setup of measuring system and analysis algorithm are easy to implement.

• Using Prony's spectral estimation method to estimate slowly varying power system frequency in the analysis model, it is not necessary to perform the resampling process for synchronization in the harmonic analysis.

• The proposed ADALINE-based indirect demodulation method can extract the accurate voltage envelope with the help of high frequency resolution.

• Compared with commonly seen algorithms, the proposed hybrid identifier can perform detection and identification of voltage events without training process.

• The virtual PQ analyzer is a flexible analytical and measuring platform without taking hardware requirements into account. Therefore, the analysis algorithm can be easily adjusted according to the revisions of international standards.

• The designed interface could facilitate the complicated task to monitor different PQ states of systems.

Phasor Estimator for Synchronization between Power Grid and Distributed Generation System

• The synchrophasor estimation with the proposed solution procedure meets the requirements of IEEE Std. C37.118-2005 and makes phasor maintain constant under the off-nominal frequency condition.

Calibration Test Platform of Power Quality Instruments for Wind Energy System

• The sampling frequency can be synchronized with the power system frequency according to the recommendation of the IEC Std. 61000-4-7 .

• The voltage envelope of flicker can be accurately extracted without the errors due to squaring multiplier in the IEC Std. 61000-4-15.

• The detection and characterization of voltage drops can not be affected by the power system frequency deviation.

• The analysis algorithms can be easily modified according to the latest revisions of international standards without taking hardware requirements into account.

Neural-Network-Based Model of Electric Arc Furnace Load

• With the mechanism of recording the associated parameters used in the neural network at each sampled time instant, the dynamic characteristics and the trends of EAF voltage and current waveforms can be accurately modeled.

• Due to the application of the sequential radial basis function neural network, the relationship between the input and the output can be effectively found without recording multiple input samples.

• With the use of the radial basis function neural network and the lookup table to record the dynamic v-i characteristics, the proposed method also can be applied in function learning and modeling of other similar nonlinear devices in a simple and efficient manner.

Design of Measurement System Based on Signal Reconstruction

• The embryo structure of remote power-quality measurement network with low-cost terminal acquisition units is developed.

• What the remote units needed to make are only the data acquisition and transmission of power-signal samples. Those difficult tasks would be processed in a central computer to achieve the functions of virtual instruments.

• After collecting the de-synchronized power signals, the central computer would perform the reconstruction mechanism with the proposed procedure to help correct power-quality analysis.

Efficient Prony-Based Solution Procedure for Tracking of Power System Voltage Variations

• The sampling frequency can be synchronized with the power system frequency according to the recommendation of IEC Std. 61000-4-7.

• The estimation of frequencies and magnitudes can be determined in very short time duration to monitor time-varying signals and to reduce computational complexity.

• The tracking of voltage variation cannot be affected by the system frequency deviation, harmonics and interharmonics.