This paper introduced the plant power-dispatching plan of AGC function for Xiaolangdi cascade centralized system in Zhengzhou.The plan not only dealt the power regulation task,but also maturely considered the cascade water relationship of Xiaolangdi and Xixiayuan power plants.It gave a practical way to get the economic aims of power efficiency,as well as the balance of flow between the two plants.
Based on the generation mechanism of chaotic attractor,a new three-dimensional multi-scroll chaotic system is proposed by introducing a unit sawtooth wave function to modify the chaotic Colpitts oscillator model,from which a(2K+1)-scroll chaotic attractor is generated.The introduction of the unit sawtooth wave function can produce index-2 equilibrium points of the system,from which multi-scroll attractor is evolved.By using conventional dynamical analysis methods,the dynamical behaviors of the proposed multi-scroll chaotic system are investigated.The research results indicate that Hopf bifurcation point of the system is only related to the control parameter,while its scroll number increases along with the number of zero points of the unit sawtooth wave function.Furthermore,a digital hardware circuit for implementing this multi-scroll chaotic system is designed based on a microcontroller(MCU).The experimental results verify the numerical simulation results.
This paper introduces the basic principle,specification and the hardware design of a Langmuir Blodgett membrane shift system.A MCU was used as the system controller which could be connected to a personal computer through standard serial port for human-machine interaction.The system could be easily setup to the automatic or manual control mode.
In accordance with the daily quota of water regulation,with consideration of the characteristics of cascade reservoirs' water regulation of Xiaolangdi and Xixiayuan Projects,as well as the recent power generation output proecss of Xiaolangdi Project(active power),the paper calculates the optimized process of daily power generation output of Xiaolangdi and Xixiayuan Reservoirs.The purpose is to make up current schedules on power generation output process and ascertain real time rolling plans,in order to schedule reasonablly the daily process of power output of Xiaolangdi and Xixiayuan Reservoirs.Hence,both tasks of water regulation and economic output regulation of the cascade reservoirs are realized.
To analyze a fractional-order chaotic system,based on an improved version of Adams-Bashforth-Moulton algorithm,investigated the method of numerical analysis for a new three-dimensional fractional-order chaotic system and achieved chaotic attractors generated from this system with different fractional-order by utilizing MATLAB software platform. Then based on frequency-domain approximation algorithm,designed a fractional-order unit circuit with an RC serial-parallel circuit and realized the proposed fractional-order chaotic system by using an analogue circuit. These results from circuit simulation and numerical analysis are identical,which indicate that the proposed two methods are feasible and verify that there is also complex nonlinear physical phenomenon in the fractional-order chaotic system.
The proposed current control scheme is based on predictive control with an identification algorithm added to compensate for the inaccuracy of the motor parameters. The parameters of armature inductance and flux linkage are identified by comparing the difference of current between a calculation model and an actual motor. The improvements in dynamics and accuracy of the current controller have been verified.
Compared with coal-fired power generation,steam pressure of waste heat power generation has the characteristic of mutation.Now the domestic waste heat generator excitation uses constant power factor regulating mode after connected with power grid.When steam pressure of steam turbine mutates,due to that active power mutation at the same direction,the generator power-angle will change at the same direction too.When power-angle is more than the allowable value,generator may be out-of-step parking.Three closed loop excitation control devices based on DSP is developed to solve this problem.When the steam pressure is greater than the maximum value,generator works at constant power angle.When the steam pressure is less than maximum value,generator works at constant power factor mode.Before connected with power grid,generator works at constant exciting current mode,so that the generator is always energy-saving and in reliable operation.
In order to avoid large amount of gas emission caused by out of step synchronous motor,the strong excitation protection was discussed from improving stability point of view.The principle and realization ways of forced excitation were analyzed.The defect of traditional open loop force excitation method was pointed out.Constant excitation current strong excitation measures were made.The correctness of new measures are verified by theory and practice.
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