Nana Heryana

Prototype development of single phase prepaid kWh meter

The single phase prepaid kWh meter consists of energy metering and STS system, based on International Standard: IEC 62055-31, 62055-41, IEC 62055-51. The energy metering measure line voltage, current and calculates active, reactive apparent power, energy, power factor, and RMS voltage and current. There are two separate inputs to measure line, ground, and/or neutral current enabling the meter to detect tampering and to continue operating. Development of single phase based on needs of PLN, which is about 7 million units kWh meter up to year 2014, especially for new customer.

Prototype development of a Low Cost data logger for PV based LED Street Lighting System

The data logger is an electronic device that records data over time or in relation to location with a built in sensor. The need of data logger is to accomplish monitoring task of street lighting system based on PV Solar Cell in Jakarta province, especially in Thousand Island Regency. Existing PV LED street lighting has not equipped by data logger, therefore monitoring task is done by manually. Prototype developed based on a microcontroller, battery powered, and equipped with internal memory for data storage, and sensors. The system developed should be “Low Power Consumption”, “Low Cost”, portable and easily embedded inside the PV LED Street Lighting controller.

Study of hybrid PV-diesel power generation system at Sebira Island-Kepulauan Seribu

Sebira Islands is one of the islands in Kepulauan Seribu, Jakarta. This island located at the the north end of the Kepulauan Seribu and not connected to submarine power cable network so that the electricity on this island is limited and only rely on diesel generator set. The government of Jakarta in cooperation with PT. CNOOC and LAPI-ITB are planning to revitalize the system by rebuilding hybrid power system between Photovoltaic panel and Diesel generator set on Sebira Island. This paper aims to make an analytical study for determining the appropriate design. The design was simulated with Homer software and then analyzed technically and economically. In this paper, some design system has been proposed on different scheme. The design has been simulated and the sensitivity analysis has been made on changing of load and fuel cost. The analysis showed that the most feasible scheme to be applied on Sebira Island is the scheme with the percentage fraction of PV and Diesel between 50-70%.

State of Charge estimation method for lithium battery using combination of Coulomb Counting and Adaptive System with considering the effect of temperature

The needs of good State of Charge (SOC) estimation method for lithium batteries are very high, not only useful for battery protection, preventing under-discharged, controlling the battery management system, and increasing the battery life, but also to increase the useable battery power. To make an SOC estimation method, second order Thevenin dynamic battery model is chosen, where the impedance values change in accordance with the SOC level. Hybrid method, which combine Coulomb Counting Method and Adaptive System Method, is chosen here. Coulomb Counting method suffers a weakness in term of initial SOC value determination, while Adaptive System Method with its ability to adjust with changes in the system will be a solution for the mentioned drawback. It can be shown that the proposed SOC estimation model is able to function properly and fairly represent the lithium battery characteristic. The method can be used not only on the specific lithium battery, but can be used in various lithium batteries by updating the its Look-up table block. Simulation and experiment have been done to verify the proposed method.

Modelling and Simulation of Switched Reluctance Motor Based on Comsol

Switched reluctance motor (SRM) drives have gained many attentions from researcher which will be used for automotive applications that needs high speed, wider range of constant power capability, ruggedness, and fault tolerance. This paper focuses on modelling and simulation of switched reluctance motor (SRM) based on COMSOL software, two dimensional finite element models of SRM were developed and established. The results show that the models established, are propitious to the accurate analysis of switched reluctance motor torque and flux. SRM 6/4 configuration was selected due to its simple structure and low cost of electronics required for the controller. The model developed will be used to design and build an EV SRM for prototype testing.

Comparison of maximum torque per Ampere and Constant Torque Angle control for 30kw Interior Interior Permanent Magnet Synchronous Motor

In this paper the comparison of Maximum Torque per Ampere (MTPA) and Constant Torque Angle (CTA) control for 30kW Interior Interior Permanent Magnet Synchronous Motor (IPMSM) is presented. MTPA is usually used for IPMSM which has a large saliency ratio for optimum torque in the machine. But for a small saliency ratio machine, MTPA control may be not produce significant result. In order to verify the analytical results, the same sample motor is verified by using Finite Element Analysis (FEA). This verification shows that MTPA and CTA gives results as expected. It also can be shown that for small saliency motor, MTPA control has not significant extra torque compare to CTA, thus the selection of MTPA for IPMSM can be re-considered. This method is quite useful in IPMSM drive application to choose the best control for IPMSM, especially when the motors have a small saliency.

Wind speed calculation by using electrical output and wind turbine power curve

Measurements of wind speed usually done by using anemometer, these data can be used as a reference signal to the wind turbine control, or it can be used also for mapping the wind energy potential. Recently, the use of anemometer on wind turbines are often eliminated because of technical and cost reasons. This paper describes an alternative method to determine the upstream wind at the wind turbine without using the anemometer, but using only the electrical output (current and voltage) and the power curve data provided by the wind turbine manufacture. Further, the power curve is mathematically modeled by polynomial interpolation method so that the wind speed equation as a function of power can be determined.

Harmonic characteristics on 20 kV - medium voltage distribution and low voltage network in PT. PLN distribution West Java and Banten

This paper describes the characteristics and levels of Harmonics on PT. PLNs 20 kV medium voltage and low voltage distribution network in West Java and Banten. In this paper a study and measurements of harmonics for various types of loads in some types of industries are conducted and verified. This paper also discuss the phenomenon of harmonics, the effect on the distribution system, harmonic-producing sources, standards and recommended practice limits for medium voltage and low voltage network according to the IEEE 519 and IEC 61000 harmonic standard. Harmonic measurements methods were done on two types by measuring the customers 20 kV medium voltage and low voltage distribution substation network. The first method was done by measuring with continuous logging for a week duration on 8 samples of medium voltage customer to know the harmonics levels and their probability occurrence. The second method was done by instantaneous measurements for 5 minutes during peak load on 20 samples of low voltage distribution loads. From the measurement results shows that harmonic current conditions-THDi on the measured distribution substations are all above 5%, and 70% of customers who have THDi measured more than 10%. Other issues on the load harmonic currents that cause pollution to the harmonic current grid are also verified. The measurement of neutral current due to the harmonic currents in low voltage side of distribution transformer neutral circuit provides that 17 out of 20 samples measured were have larger value than the calculated condition without harmonics pollution.

Magnetic simulation comparation of 30 kW switched reluctance motor with 6/4 and 6/10 design configurations for electric vehicle

Comparation of switched-reluctance motor (SRM) with 6/4 and 6/10 design configurations are presented in this paper. Both configurations are calculated and designed in detail to obtain the flux and torque characteristics. The study also conduct analysis for both configurations. Simulation of SRM using 2D finite element model is presented to support the analysis, and used to predict the torque produced at various currents and rotor positions. The time stepped FEA, is the most accurate method available to obtain the magnetic characteristic in an electromagnetic device. In this paper torque and flux characteristic of the model 6/4 SRM and 6/10 SRM are evaluated and compared. The SRM 6/4 produced maximum torque at 102 Nm and for SRM 6/10 produced at 145.2 Nm, so SRM 6/10 produce 42.3% greater torque than 6/4 configuration, both configuration are suitable for electric vehicle application.

Analysis of bidirectional DC fast charging according to distribution transformer loading conditions

In this paper, a bidirectional dc fast charging system for electric vehicle is analysed by considering its impact on the distribution transformer. The proposed battery charger topology combines constant voltage and constant current strategy as the battery charging control techniques. Both of working mode works interchangeably depends on distribution transformer loading condition. The model is verified by simulation that is performed by using a Thevenin model of a battery. The calculation time of charging battery is also performed for each working mode. Moreover, the impact of the dc fast charging system to the harmonics of the distribution grid is also analysed. It can be shown that the total harmonic distortion impact of charging infrastructure is less than 5%.