Research On Power Accurate Measurement And Energy-saving Technology In The Distribution Network Of Enterprises

Large number of dynamic distortion users existed in our country, the power lossis serious. According to statistics, iron and steel, chemicals, electrified railway andother major energy-intensive industries energy consumption accounted for70%of theenergy consumption of the society. High energy consumption industries are mostlynon-linear loads having features as follows: large of volatility, irregular, highharmonic and so on, resulting in larger error of energy metering devices.Thoroughresearch of accurate power measurement and energy-saving technologies for nonlinearusers is very necessary to promote energy saving and emission reduction in electricfield and improve energy-saving positivity of consumers.The characteristics and of typical nonlinear load such as rectifier unit, railwayelectrification and electric arc furnace, the influence to energy metering and the gridpower loss of the power quality problems especially electric harmonic from theworking principle and frequency response characteristics of induction meter andelectronic energy meter are analyzed. The choice of measurement method for thenonlinear load is discussed.The waveform distortion creates great error in power energy measurement basedon sinusoidal power calculation method. active energy calculation method for oflarge.Third-order algebraic accuracy simpson integration algorithm is adopted.Calculated results show that the integral method reduces the measurement error of theactive energy metering. A dynamic phase compensation algorithm is proposed, themethod combines the advantage of FIR and Newton interpolation algorithm, furthercompensates effects of frequency, temperature drift, time drift.Because the power consumption of nonlinear user is irregular and exists severeshocks, the zero-flux current sensor technology and stepless zoom technology isadopted to achieve a wide range accurate power measurement for impact load. Impactload energy meter suitable for electric users with large crrunt shocks was developed,improving the accuracy of power measurement for impact users.Consider the loss of electricity caused by harmonics, improved harmonicPrincing Model and full-wave energy reward and punishment method is proposed. Asoftware of management energy-saving based on energy metering in the distributionnetwork of a enterprise is developed by Delphi7.0. The software includes four modules such as rewards and punishments of electrical energy consumption, wiringdiagram showing, intelligent reporting, rewards and punishments data query. Thesoftware promotes the non-linear users to control harmonics, to save energyconsumption and to improve energy efficiency by the harmonic pricing and a meansof reward and punishment power consumption, ensuring grid security and stabilityand saving energy as well.Finally, power quality testing data of nonlinear users is listed. Modeling thedistribution network of a steel plant with large amount of harmonics, integratedharmonic control program with two passive power filters resonateing at250Hz and550Hz respectively and a double resonance injected hybrid active power filter isproposed and simulated. The simulation results show the effectiveness of theproposed program. Operating data of the harmonic energy meter is analyzed, andapplication of the software is introduced. Data analysis shows the correctness oftheoretical analysis and technical effectiveness of the method.