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An Exact Model for Rotor Field-Oriented Control of Single-Phase Induction Motors
Mohammad Jannati;
Ali Monadi;
Sajad A. Anbaran;
Nik Rumzi Nik Idris;
Mohd Junaidi Abdul Aziz
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5110-5120
This work presents a new Rotor Field-Oriented Control (RFOC) technique for single-phase Induction Motors (IMs). The proposed method uses two rotational transformations, which extract from the steady-state equivalent circuit of single-phase IM. It is proved by using proposed rotational transformations, the single-phase IM asymmetrical equations change into symmetrical equations. In the proposed technique, the assumption of (Mq/Md)2=Lqs/Lds=a2 which is usually used in other FOC of single-phase IMs, is not considered. Performance of the proposed technique is assessed using MATLAB/SIMULINK. Extensive simulation results show the performance and correctness of the proposed method.
Delay Separated Neural Network Inverse Control in Main-Steam Temperature System
Lingfang Sun;
Yihang Li;
Dan Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5244-5250
In order to improve the control effect of the main steam temperature with large time delay, this paper proposed a delay separated neural network inverse (DSNNI) control scheme. The delay time and the positive model without delay were given by using adaptive linear element and BP network. The neural network inverse model of the positive model without delay was built on that basis. An appropriate reference model was selected to make the inverse model’s output smoothing. It is an open-loop control system when the model is cascaded into original system. It will avoid the instability caused by the closed-loop control systems. Off-line identification and on-line identification are combined to get the inverse model in order to reduce the steady-state error and make the system have fine adaptive capacity. Detail simulation tests are carried out on the given 300MW power unit. Tests show that the neural network inverse control with delay time separation can get rapid and smooth output for the main steam temperature system. It is able to overcome the adverse effects caused by the time delay and the parameters changes. Compared with the cascade PID controller, the adjustment time of DSNNI reduces from 600s to380s and shows faster response, better robustness and anti-interference performance.
A Virtual Physics-based Approach to Multiple Odor Sources Localization
Xiaoping Ma;
Yuli Zhang;
Yanzi Miao
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5331-5341
The detection of an odor source location has been enhanced by using multiple plume-tracing mobile robots. So far, many researchers focus on locating a single source in varied environments. The present study is concerned with the problem of multiple chemical sources localization using multi-robot system. In this study, multiple groups of robots were used and coordinated by a multi-robot cooperation strategy with virtual physics force, which includes structure formation force, goal force, repulsion force and rotary force. In order to test the effectiveness of the proposed strategy, plume model with two sources was constructed by computation fluid dynamics simulations. Simulation experiment discussed the influence of the varied frequencies of wind direction/ speed and methane release with different initial positions of multiple groups to the search performance. Simulation comparison experiments using three kinds of plume tracing algorithms: chemotaxis, anemotaxis and fluxotaxis were carried out respectively and the comparative result about three plume tracing algorithms was illustrated.
Rateless Codes Design Scheme Based on Two Stages
Yunji Li;
Xiaolong Yang;
Keping Long
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5469-5475
Current rateless codes coding schemes ignored the order recovery of packets. To cope with this problem, average delay and maximum memory consumption were proposed as performance indices to characterize the order recovery performance, then a coding scheme based on two stages coding was proposed to improve the order recovery performance. Encoding of the front k coded symbols is the first stage, which the ith coded symbol is compose of the ith packet and other di-1 packets which are chosen from the front i-1 packets with equal probability. Encoding of the remaining infinite coded symbols is the second stage which the packets are chosen from all packets equal probably. The simulation results show that the rateless codes from the proposed scheme have better order recovery performance, meanwhile have high bandwidth efficiency and good uniformity recovery than LT codes.
Construction Protocol of Wireless Sensor Network based on Centralized Clustering Routing and Time Division Multiplexing MAC Protocol
Shitao Yan;
Mianrong Yang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5591-5598
LEACH is a routing protocol based on clustering in wireless sensor networks and is based on a low power adaptive hierarchical routing algorithm design of wireless sensor network. Time division multiplexing mechanism is for each wireless sensor network node distribution independent time slots for data transceiver, and the node into sleep state in other free time slot. This paper introduces MAC protocol based on time division multiplexing. The paper proposes construction protocol of wireless sensor network based on centralized clustering routing and time division multiplexing MAC protocol. The simulation results show that the LEACHEE protocol can effectively reduce network energy consumption, prolong the network life cycle.
Theoretical Study of Multiple Solar Cells System as a Function of Temperature
Ben Slimane Hassane;
Ben Moussa Dennai;
Helmaoui Abderrachid
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp4928-4933
A simulation model has been performed on materials as Ge, Si, GaAs, AlGaAs and the values of gaps Egk of hypothetical materials, the calculation of the corresponding maximum efficiency was carried out for multigap solar cells systems coupled in splitting mode. The effects of an optical coupling by a dichroic mirror between independent solar cells, and solar cells coupled in series has been analysed. One particular result of our study is that the coupling by a dichroic mirror between an independent cell gives an interesting efficiency.
A Harmonic Analysis Method Based on Harris Window for Digital Substation
Luo Hanwu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5078-5085
Accurate and efficient harmonics detection is an important premise and basis for controlling the harmonics. The sampling frequency of the grid voltage and current in digital substation normally must be kept constantly as required by the standard of IEC61850, thus the asynchronous sampling caused by the fluctuating grid frequency and this constant sampling frequency will result in spectral leakage and aliasing which would affect the accuracy of harmonic analysis. In this paper, a double-spectrum-line interpolation Fast Fourier Transform approach based on multi-term Harris window for grid frequency and harmonic measurement was proposed, and the simple and practical adjustment formulas for the frequency, amplitude and phase angle were derived by curve fitting. The correctness and effectiveness of the proposed method were validated by simulation and field test.
An Improved A Low Power CMOS TIQ Comparator Flash ADC
A Al;
Mamun B. Ibne Reaz;
J. Jalil;
Mohd. Alauddin Bin Mohd. Ali
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5204-5210
This paper was presented the design of a threshold inverter quantized (TIQ) comparator in flash analog to digital converter. The TIQ-comparator has a high speed response; however this circuit involves a lot of transistors hence wasteful power consumption. The design is intended to obtain a low-power TIQ-comparator and reduces the area of the chip in 0.18 µm CMOS technology. The method was proposed to set each of the transistor channel length for the threshold voltage difference gained of the inverter each in the TIQ-comparator and adding a transistor as compensation to overcome the limitations of the length channel expansion due to the body effect influence. This method has reduced the drain current of CMOS transistors; hence the power dissipation can be reduced. The event has achieved low power dissipation of 31.14 µW and a chip size of 1065 µm2 with 0 to 0.6 V input signal condition.
SISO P-ILC Algorithm for Output Data Dropouts and Its Application in Wastewater Biological Treatment Plant
Gu Qun;
Hao Xiaohong;
Li Zhuoyue;
Wang Hua
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5293-5297
In order to improve the efficiency of sewage treatment, We construct P-ILC algorithm for output data dropouts.The P-ILC algorithm is used in the aeration tank of oxygen input link, and according to the actual situation, considering the data generating omissions, adjusting the algorithm can completely control the aeration tank of oxygen. After 15 iterations, we can completely control the oxygen in the aeration tank volume. We know more important is this algorithm may at any time according to need of aeration tank of oxygen supplement, when the lack of oxygen, can open the oxygen filling pump, when sufficient oxygen, close the oxygen filling pump, to achieve energy saving goals, ultimately makes the economic benefits to achieve the highest.
Study of Additive Dither on Restraining Signal Truncation Error
Tao Liu;
Shulin Tian;
Zhigang Wang;
Lianping Guo
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science
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DOI: 10.11591/ijeecs.v12.i7.pp5420-5429
Owing to the limited calculation precision during digital signal processing, the intermediate stages’ signal-bit-width truncation should be executed to realize the conversion from high precision to low one. As method of direct truncation will degenerate the Spurious Free Dynamic Range (SFDR) performance of the output signal, this paper proposed that additional digital dither should be added before operation of truncation, which could decline the harmonic distortion efficiently and extend the dynamic range of the truncated signal significantly. Two simulations for truncation operation towards signal with additive Gaussian dither and uniform dither are carried out to prove the validity of the proposed method. Comparative studies demonstrate that the proposed algorithm applied in Gaussian dithering and uniform dithering could improve the output SFDR performance by about 16dB and 15dB respectively.