The noise on the rural distribution line communication is mainly generated by the electrical equipment connected to the power line. It has a certain degree of influence on the communication system. The accuracy requirement of the system to the output of the signal is becoming increasingly high. How to improve information transmission method and efficiency of the rural distribution line communication is a key issue of the current power industry. The blind source separation technique, theory characteristic and the related model are discussed. Using fixed point algorithm (FastICA) to eliminate noise on the rural distribution line communication signal is researched. A variety of mixed-signal separation is simulated by the fixed point algorithm. The experimental results are analyzed. The blind signal separation technology used in the rural distribution line communication system has theoretical basis and feasibility of practical application.

This paper presents a short-term electric load forecasting method based on Autoregressive Tree Algorithm and Rough Set Theory. Firstly, Rough Set Theory was used to reduce the testing properties of Autoregressive Tree. It can optimize the Autoregressive Tree Algorithm. Then, Autoregressive Tree Model of Short-term electric load forecasting is set up. Using Rough Set Theory, the attributes will be reduced off; whose dependence is zero, through knowledge reduction method. It not only avoids the complexity and long training time of the model, but also considers various factors comprehensively. At the same time, this algorithm has improved the prediction rate greatly by using automatic Data Mining Algorithms. Practical examples show that it can improve the load forecast accuracy effectively, and reduce the prediction time.

In order to improve the level of automation about the traditional small henhouses, a set of remote environment control system of telligent network henhouse is designed by combing ARM and ZIGBEE network technology with traditional henhouse construction in this paper.This system took the S3C2440 of ARM9 microprocessor as the core, and Linux system as development platform to realize data collection and transmission through the ZIGBEE wireless sensor network, so that culturists can remote control and monitor the facilities and indicators in the henhouse simply through broadband network, the labor intensity is greatly reduced and the working efficiency is raised (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]

According to the characteristics of the power harmonic which includes steady and transient components and the wavelet analysis ability which processes unsteady signals and has the characteristic of multi-resolution analysis, the method of wavelet transform is applied to the detection of power harmonic. The method using wavelet transform to detect various harmonics in signals to be measured is presented and using Matlab to complete the simulation experiment. The results of simulation show that the harmonic signal can be exactly extracted and separated the fundamental harmonic and high order harmonic by using the method of wavelet packet transform. Therefore, wavelet transform analysis is a valid method in harmonic detection in power system.

An intelligent standardization operating management system was developed, which can fit the status of power development in China's rural areas and combine the modern information technology. The object-oriented idea was applied in the design of the system. The.NET Framework system was used to develop the system. The system was based on a C/S and B/S mixed mode and three-layer structure. The workload of staff was lower and the risk of field operations was reduced because of the automatic generation, the unified management of the operation guidance books the work bills and operation bills. The system provided support decision-making for the overall statistics, analysis and mining of the information.

Using the harmonic characteristics of output voltage of inverter to design an ameliorative filter which can suppress common-mode and differential-mode voltage at the same time. The simulation is done by MATLAB and the results of the simulation show that long cables are allowed to connect inverter and motor for the filter. By altering the parameters of the filter, the overvoltage in the motor can be eliminated, which plays a good role of suppressing output harmonics of the inverter.

A fuzzy method using in voltage and reactive power control in electric substation is proposed based on the improved 17 Areas Method derived from 9 Areas Method. A simulation model is founded with fuzzy control rules used the Matlab simulink. The simulation results indicate that voltage of the model with fuzzy control is less fluctuating and much steadier than the system without fuzzy control. As well as, the regulated times at the tap positions of transformers in substation are much less than usual. So, applying fuzzy method rules on voltage and reactive power control can enhance static and transient stability and extend the life-time of the devices in power system.

With the development of the rural power grids increasing gradually, there are higher requirements needed for its operation in reliability and economy. Reactive compensation using shunt capacitor at both ends of the load, reducing current of lines, and improves the power factor of system. The objective is to reduce losses of line, and improves the quality of voltage and the utilization of electrical equipments. In the switching control of compensation device, using voltage and reactive power these two factors to control, this is the fuzzy control. The range of voltage and reactive power are divided into several regions to determine the membership of each region. Using MATLAB simulation achieves a design method of fuzzy reasoning logic control, and gets an ideal control results.

With the development of rural power market in our country, how to improve the operation more correctly and timely of power quantity collection, transmission and processing becomes a problem. The requirement of equipment in power quantity collection needs new and higher demands. The advantage of using dual-port RAM and main-spare CPU structure, when main CPU running, spare CPU supply monitoring of main CPU status messages, once main CPU break down, spare CPU could instead of main CPU completely. This paper introduces collectivity design in flow chart, hardware design include theory and application in detail. Using dual-port RAM to communicate between the main and spare, CPU not only make sure the transmission efficiency, good anti-jamming performance, improve the speed of disposal, but also reduce the costs, making the operation of rural power network more security, economy and reliability. In rural power terminal system of power quantity collection has broad application prospects.