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In this paper, we propose a cost-efficient hardware design, coarse and fine rotation (CFR) based FFT twiddle factor generator. It aims to extremely reduce the hardware area, especially for the larger length of FFT-points. Also, our proposed approach is generalized for arbitrary FFT sizes, not limited to the power of 2. In hardware implementation by using TSMC 90-nm CMOS technology, the circuit area...
Electricity in rural area of Indonesia is mostly in small-scale with diesel generator as the main power source. These diesel generators are mostly in the latter stage of operational age, thus have limited capability and poor performance. Microgrid has been introduced lately, as a system to integrate more renewable energy sources to the existing power system. Photovoltaic (PV) source is one of the...
This paper presents novel of power system stabilizer in which intend to investigate and observe the oscillation due to disturbances then define power angle difference on South Sulawesi grid. The symmetrical three phase fault and single phase fault to ground have been implemented and results show that the 150 kV of South Sulawesi grid tend to reach the limit of transient stability and then subject...
Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
This paper presents the design and implementation of a robust drive train torque control for rotor inertia emulation in a dynamometer test bench application. The controller is part of a hardware-in-the-loop (HiL) framework for a 50 kW small test rig that enables a real-time interaction between test rig drive train and a rotor model. The control objective is to compensate undesired dynamics of the...
In this paper, a method for minimizing the fuel consumption in a diesel generator set using a wound rotor synchronous generator (WRSG) is introduced. The proposed method uses direct monitoring of fuel flow rates and generator output to actively search for an optimal stator voltage. By weakening the field of the WRSG, the overall efficiency of the system is increased. Simulation models of the diesel...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
Strict regulation on emissions of air pollutants imposed by the maritime authorities has led to the introduction of hybrid microgrids to the shipboard power systems (SPSs) which acts toward energy efficient ships with less pollution. A hybrid energy system can include different means of generation such as renewables (e.g., solar PV, wind power) and conventionals (e.g., diesel engines) as well as energy...
Among the renewable resources such as wind, biomass, hydel and solar, hydrokinetics is a largely untapped renewable resource that has good potential for small and medium-scale power generation. This work proposes a novel approach for scalable and modular hydrokinetics power generation from slow moving water bodies such as irrigation canals, by integration of multiple turbines with voltage droop control...
With the development of offshore wind power generation, large-capacity medium-voltage wind turbine becomes the development trend. In this paper, the cascaded multi-cell topology with four-quadrant operation capacity is applied to medium-voltage wind power converters, which consist of a large number of switching devices, so it is essential to improve the converter's fault-tolerant ability. Once the...
An open-loop and closed-loop operating boost-power-stage converter with relatively low damping factor exhibit resonant behavior in transient conditions. Such an undamped transient characteristic introduces overshoot to the control-to-output-variable transfer function, which is also visible in the inductor current transient behavior. Therefore, due to the either too large duty ratio or voltage-reference...
In this paper, methods of energy transformation to reduce OPEX for remote area are introduced which can be divided into efficiency improving and consumption reducing.
With the increasing penetration of renewable energy generations such as solar and wind power, negative impacts of the large-scale integration of renewable energy on the bulk grid cannot be ignored. Thus, grid integration testing of inverter-coupled renewable energy is essential. For this reason, a high power gird simulator capable of emulating various types of realistic grid conditions is needed for...
Telstra's telecommunication network covers a diverse area, which is subject to Australia's challenging environmental factors. These factors present challenges to the network and can prominently affect Telstra's remote sites, especially off-grid sites. This paper presents the key findings of using stationary fuel cells at these remote sites. The fuel cells implemented by Telstra are indirect methanol...
The objective of this paper is to clarify the differences between cold aisle containment (CAC) and hot aisle containment (HAC) with regard to the air-intake temperature of the ICT equipment in the rack. Thus, we constructed a system in which these two capping methods could be compared under the same load and air-conditioned environment, and measured those thermal environments. When the ICT equipment...
Microgrid research and development in the past decades have been one of the most popular topics. Similarly, the photovoltaic generation has been surging among renewable generation in the past few years, thanks to the availability, affordability, technology maturity of the PV panels and the PV inverter in the general market. Unfortunately, quite often, the PV installations are connected to weak grids...
This paper proposes a new high-voltage Pulse Generator (PG), fed from low voltage dc supply Vs. This input supply voltage is utilized to charge two arms of N series-connected modular multilevel converter sub-module capacitors sequentially through a resistive-inductive branch, such that each arm is charged to NVS. With a step-up nano-crystalline transformer of n turns ratio, the proposed PG is able...
While many advantages can be offered by DC-based integrated power system, it is a challenging task to continuously maintain optimal performance with a dynamic load profile. Coordination between the real-time controllers and system optimizer is not a trivial task in such conditions. Some of the protection schemes provide fault detection and isolation functions, but do not consider system level optimization...
This paper addresses the modeling and controller design of large scale dc microgrids with nonlinear loads. First, the dynamic models of the sources and loads are discussed in detail, placing particular emphasis on generators with passive rectification and Constant Power Loads (CPLs) with input filters. These models will be defined as source and load nodes which along with internal nodes, will be integrated...
This paper proposes an Energy Management System (EMS) of the electrical plant of a yatch with a DC micro-grid structure. Such an EMS has as target function the reduction of the DE fuel consumption and correspondingly of the related polluting emission. A complete dynamic model of the electric plant of a yacht has been presented. In particular, assumed that the main electrical generator of the ship...
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