Heri Suryoatmojo

Bio: Heri Suryoatmojo is an academic researcher from Sepuluh Nopember Institute of Technology. The author has contributed to research in topics: Photovoltaic system & Control theory. The author has an hindex of 8, co-authored 68 publications receiving 213 citations. Previous affiliations of Heri Suryoatmojo include Kumamoto University.

Development of hand gesture recognition sensor based on accelerometer and gyroscope for controlling arm of underwater remotely operated robot

Abstract: Hand Gesture Recognition sensor based on accelerometer and gyroscope is a sensor for capturing the positions of operator hand while controlling underwater remotely operated vehicle equipped with an arm. The proposed system has an advantage in its convenience by means of no training or exercise needed for operator before using it. The key issue here is how beginner operator could use easily the underwater remotely operated robot arm without any specific training. The conventional one uses a joystick for controlling the underwater system and it is inconvenience for beginner user as well as less precision. The proposed system consists of two main part: (1) ground station and (2) underwater remotely operated robot arm. This paper proposes the development of hand gesture recognition sensor used by operator at the ground station for controlling robot arm at the underwater robot. The proposed sensor uses accelerometers and gyroscopes installed in elbow, forearm, and wrist. These devices measure 3D position of each joints for constructing 3D position of hand. We design sensor's casing for its convenience of use by using CAD software. Each sensor is connected by Arduino Nano microcontroller having compact circuit and embedded it into sensor's casing. The sensors are connected to a microcontroller acting as master connected to microcontroller slave (sensor part). These sensors value are converted to 3D position by using forward kinematic. The forward kinematic values are sent to the underwater robot by using a wire utilizing Pulse Position Signal. Then, it converted again to servo's movement by using inverse kinematic. The result is operator able to control the underwater remotely robot arm by utilizing hand gesture directly. The last, operator could control the robot gripper based on flex sensor installed in operator's fingers. The accuracy of the sensor has been tested under laboratory condition, it has 98% of accuracy.

A Novel Dynamic Voltage Restorer with Outage Handling Capability Using Fuzzy Logic Controler

Abstract: This paper presents a novel dynamic voltage restorer (DVR) capable of handling deep sags including outage on a low voltage distribution system. The DVR recovers sags up to 10% of nominal voltage; otherwise, it will operate as an uninterruptible power supply (UPS). A transformer is connected in series with the load when restoring sags, and is reconfigured into parallel connection using switches when handling outages. The controller uses a Fuzzy Logic with 3 inputs to maintain the load voltage through d-q transformation. Preliminary results from laboratory tests are also presented in this paper.

Optimal controller for doubly fed induction generator (DFIG) using Differential Evolutionary Algorithm (DE)

Abstract: Variable-speed wind turbine (VST) with doubly-fed induction generator (DFIG) is one type of wind power that capable of producing electrical energy efficiently, capable of controlling real and reactive power generator, and improves the power quality. However, DFIG wind turbine has a variable-frequency AC / DC / AC converter (VFC) and IGBT switches that very sensitive to overcurrent which occur during transient disturbance. To protect the DFIG rotor circuit from excessive current, the rotor side converter will be blocked when VFC trip, so the DFIG detached from power system. Release of DFIG during disturbances can cause the production of electricity will be disrupted. By applying the proper control design, the quality of electricity supply during a disturbance can be corrected. In this research, the optimal design of PI controller in the rotor side converter (RSC) with DFIG wind turbine using the Differential Evolutionary Algorithm (DE) is proposed to improve the DFIG performance during disturbance. The simulation results indicate that the application of optimal design of PI controller on DFIG using DE can improve the performance of DFIG during disturbances. It shown by the significantly reducing of overshoot rotor current and voltage DC-link of DFIG with the optimized design when compared with the initial controller design system..

Design of parabolic solar concentrator to improve the optical efficiency for thermal engine generator using dual reflector Gregorian method

Abstract: Parabolic Dish Solar Concentrator (PDSC) are commonly used to generate electricity from thermal energy employing Stirling engine, steam, photovoltaic and thermoelectric generator. Heat concentrator of Parabolic Dish (PD) is used for focusing radiation of the sun into the receiver that connected to the generator system. The conventional generator system is located above the focus of the primary reflector parabolic dish. This paper presents a new design of the parabolic dish solar concentrator using dual reflector Gregorian method. The design applies an additional reflector to place the engine generator in the bottom of the primary reflector parabolic dish. The design was verified using “SolTrace”, a software package for tracing the solar ray. It found that the heat flux collected was 0.73 MW/m2 for the designed parabolic with 300 cm primary diameter. This parabolic have obtained 594.65x geometry concentration ratio and 84.27% optical efficiency.