... The THDl for the combined PC loads was 74.61% in which this value is lower when compared with... more ... The THDl for the combined PC loads was 74.61% in which this value is lower when compared with the individual THD! produced by each PC load. This is due to current attenuation and current cancellation factors [7-91. ... The THDl for the UPS simulation model is Page 5. ...
This study presents a voltage generation behavioral analysis of the thermoelectric module (TEM) i... more This study presents a voltage generation behavioral analysis of the thermoelectric module (TEM) in a transient condition. Two configurations module is carried out to perform the observational analysis of the TEM; which is single TEM and multi stage TEM. For the multi stage TEM, another two arrangements is executed by cascading three and six TEM subsequently. In this real TEM application, both TEM's junction is left for natural heating and cooling. A test rig is developed to obtain the data-driven measurement of both single and multi stage TEM. The measurement data show that both the single and multi stage configuration of TEM able to works efficiently at a test temperature between 50 °C to 100 °C. The implication of this analysis is that a suitable operating temperature can be initially set before maximum power point tracking algorithm is applied later on to any selected TEM arrangements.
This paper presents a cantilever beam vibration from fluid interactions with triangular shape blu... more This paper presents a cantilever beam vibration from fluid interactions with triangular shape blunt-body for energy harvesting application. The cantilever beam produces mechanical energy by interacting between fluid and blunt-body and then converts it into an electrical energy through the piezoelectric effect. The cantilever beam has been developed in the COMSOL software by using the finite element method. In this work, Reynolds number, the lift and drag coefficients have been chosen to analyze two blunt-bodies of circular shape and triangular shape to identify the right blunt-body for optimized cantilever based energy harvester design. To harvest the energy from the vibration viewpoint, it is essential to calculate the frequency of vibrations at different fluid speeds. The main motive here is to seek a higher synchronized region of frequencies for the oscillation amplitudes for a range of fluid velocity and to calculate the lift and drag coefficients. The result of the proposed method outperforms better than the other compared methods and the result proved that the triangular shape blunt-body has higher lifting force compared to the circular shape that produces 0.5V.
This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy s... more This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage (PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emergency conditions. When the system is grid-connected, BES regulates the fluctuated power output which ensures smooth net injected power from the PV/BES system. In islanded operation, BES system is transferred to single master operation during which the frequency and voltage of the islanded microgrid are regulated at the desired level. PSCAD/EMTDC simulation validates the proposed method and obtained favorable results on power set-point tracking strategies with very small deviations of net output power compared to the power set-point. The state-of-charge regulation scheme also very effective with SOC has been regulated between 32% and 79% range.
This paper presents a new nonintrusive load identification method to disaggregate the target load... more This paper presents a new nonintrusive load identification method to disaggregate the target load in a typical commercial building. For this purpose, experiments were carried out in the laboratory implementing real load switching activity and power measurements were made with a smart meter. Nonintrusive load monitoring is performed by analysing the power signals obtained from the smart meter and detecting the operation of load appliances. A new feature extraction technique based on the time-time (TT)-transform is applied to improve the load identification. For classifying and predicting the various load operations, a new intelligent technique called as extreme learning machine with single hidden layer feedforward neural network is developed. ELM has high efficiency and simple to be implemented. The inputs to the ELM are the extracted TT-transform features together with other signals like real and reactive powers while the ELM outputs are the switching states of the load appliances. The load appliances considered in the study are the lightings, personal computers and air conditioners. The ELM accuracy is validated by testing with unknown dataset recorded by the smart meter at 1 minute sampling rate. The ELM testing results showed that the desired level of load identification can be achieved by using additional TT-transform features.
ABSTRACT This paper presents a relatively new meta-heuristic optimization technique known as the ... more ABSTRACT This paper presents a relatively new meta-heuristic optimization technique known as the Lightning Search Algorithm (LSA) for developing an optimal proportional-integral (PI) voltage controller for a piezoelectric energy harvesting system (PEHS) converter. In the conventional PI voltage controller, a trial and error procedure is normally used to obtain optimal values for the proportional gain (Kp), and integral gain (Ki). This procedure is time consuming and does not conduct to suitable solutions. To overcome the exhaustive traditional trial-and-error procedure, the LSA optimization algorithm is proposed for obtaining optimal Kp and Ki values for the PI voltage controller.
... The THDl for the combined PC loads was 74.61% in which this value is lower when compared with... more ... The THDl for the combined PC loads was 74.61% in which this value is lower when compared with the individual THD! produced by each PC load. This is due to current attenuation and current cancellation factors [7-91. ... The THDl for the UPS simulation model is Page 5. ...
This study presents a voltage generation behavioral analysis of the thermoelectric module (TEM) i... more This study presents a voltage generation behavioral analysis of the thermoelectric module (TEM) in a transient condition. Two configurations module is carried out to perform the observational analysis of the TEM; which is single TEM and multi stage TEM. For the multi stage TEM, another two arrangements is executed by cascading three and six TEM subsequently. In this real TEM application, both TEM's junction is left for natural heating and cooling. A test rig is developed to obtain the data-driven measurement of both single and multi stage TEM. The measurement data show that both the single and multi stage configuration of TEM able to works efficiently at a test temperature between 50 °C to 100 °C. The implication of this analysis is that a suitable operating temperature can be initially set before maximum power point tracking algorithm is applied later on to any selected TEM arrangements.
This paper presents a cantilever beam vibration from fluid interactions with triangular shape blu... more This paper presents a cantilever beam vibration from fluid interactions with triangular shape blunt-body for energy harvesting application. The cantilever beam produces mechanical energy by interacting between fluid and blunt-body and then converts it into an electrical energy through the piezoelectric effect. The cantilever beam has been developed in the COMSOL software by using the finite element method. In this work, Reynolds number, the lift and drag coefficients have been chosen to analyze two blunt-bodies of circular shape and triangular shape to identify the right blunt-body for optimized cantilever based energy harvester design. To harvest the energy from the vibration viewpoint, it is essential to calculate the frequency of vibrations at different fluid speeds. The main motive here is to seek a higher synchronized region of frequencies for the oscillation amplitudes for a range of fluid velocity and to calculate the lift and drag coefficients. The result of the proposed method outperforms better than the other compared methods and the result proved that the triangular shape blunt-body has higher lifting force compared to the circular shape that produces 0.5V.
This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy s... more This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage (PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emergency conditions. When the system is grid-connected, BES regulates the fluctuated power output which ensures smooth net injected power from the PV/BES system. In islanded operation, BES system is transferred to single master operation during which the frequency and voltage of the islanded microgrid are regulated at the desired level. PSCAD/EMTDC simulation validates the proposed method and obtained favorable results on power set-point tracking strategies with very small deviations of net output power compared to the power set-point. The state-of-charge regulation scheme also very effective with SOC has been regulated between 32% and 79% range.
This paper presents a new nonintrusive load identification method to disaggregate the target load... more This paper presents a new nonintrusive load identification method to disaggregate the target load in a typical commercial building. For this purpose, experiments were carried out in the laboratory implementing real load switching activity and power measurements were made with a smart meter. Nonintrusive load monitoring is performed by analysing the power signals obtained from the smart meter and detecting the operation of load appliances. A new feature extraction technique based on the time-time (TT)-transform is applied to improve the load identification. For classifying and predicting the various load operations, a new intelligent technique called as extreme learning machine with single hidden layer feedforward neural network is developed. ELM has high efficiency and simple to be implemented. The inputs to the ELM are the extracted TT-transform features together with other signals like real and reactive powers while the ELM outputs are the switching states of the load appliances. The load appliances considered in the study are the lightings, personal computers and air conditioners. The ELM accuracy is validated by testing with unknown dataset recorded by the smart meter at 1 minute sampling rate. The ELM testing results showed that the desired level of load identification can be achieved by using additional TT-transform features.
ABSTRACT This paper presents a relatively new meta-heuristic optimization technique known as the ... more ABSTRACT This paper presents a relatively new meta-heuristic optimization technique known as the Lightning Search Algorithm (LSA) for developing an optimal proportional-integral (PI) voltage controller for a piezoelectric energy harvesting system (PEHS) converter. In the conventional PI voltage controller, a trial and error procedure is normally used to obtain optimal values for the proportional gain (Kp), and integral gain (Ki). This procedure is time consuming and does not conduct to suitable solutions. To overcome the exhaustive traditional trial-and-error procedure, the LSA optimization algorithm is proposed for obtaining optimal Kp and Ki values for the PI voltage controller.
Uploads