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Gas sensor array is an important part of electronic nose. The recognition ability of electronic nose is affected by the cross sensitivity of gas sensor array. We propose a pattern recognition method for electronic nose by combined use of kernel independent component analysis (KICA) and least squares support vector machine (LS-SVM) in this paper. In the proposed method, the KICA algorithm based on...
In this paper, effect of excitation control parameters of doubly-fed induction generators on power system voltage stability is discussed. The excitation control of DFIG considered is mainly the constant voltage control and constant power factor control. Simulation test is carried out in Zhangjiakou wind farm in China, and key parameters of excitation control model of DFIG system are studied.
The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed power control algorithm applied to PMSG is proposed, and then design the controller using tip speed radio and flux-weakening control scheme. It can not only provide a constant switching...
In this paper, a doubly-fed speed regulation system employing a core TMS320LF2407A-type DSP(Digital Signal Processor) chip controller and using the stator flux oriented vector control strategy has been described and analyzed. Its control block diagram and the flow chart of main routine are given as well. The speed of the motor, the stator voltage and current waveforms can be obtained under different...
This paper analyzed the relationship of environment pollution and economic growth by the data of 1980–2009 in China. The results showed that: the relationship of environment pollution and economic growth further verified the EKC hypothesis; from the specific indicators, the relationship of industrial wastewater emissions and per capita GDP displayed the type of N, and the relationship of industrial...
Towards the reactive compensation feature of distribution network and integral substation, this paper proposed an integration structure of distribution transformer and STATCOM (DT-STATCOM). It use the surplus capacity of transformer to compensate the reactive power; by setting the connect voltage flexible, it extended the switching devices selection; the integration structure reduce the volume and...
The penetration of distributed generation resources in distribution grids increasing worldwide, it is both a challenge and an opportunity for a variety of technologies and operating scenarios. The need to provide acceptable power quality and reliability will create a very favorable climate for the entry of distributed resources and innovative operating practices. Distributed resources is a term that...
The development of micro-grid and energy storage devices are inseparable, without energy storage devices, micro-grid will not be able to run stablely, the paper reviews the principle of SMES devices and the main circuit topology, ultimately the cascaded H-bridge topology is adopted. Simulation and analysis is carried out, and the results show that the device active and reactive power can be well compensated...
Developing a high performance control strategy for grid side PWM converter of DFIG wind power generation system is a significant point. In this paper, first, deriving and analyzing the mathematical model of grid side PWM converter, a vector control strategy is proposed. Second, the voltage vectors influence on the active power change and the reactive power change was analyzed, a direct power control...
This paper research the Photovoltaic system accessed to the distribution network through the electronic power transformer (EPT) which is different from the conventional style. So the EPT is been slightly changed which is different from the type already been studied. The paper mainly study the work performance of the EPT when it is used in the Photovoltaic system which can adjust the voltage, current...
Multilevel diode clamped converter (DCC) has gained more and more focus nowadays due to its adaptability to high-power and high-voltage applications. Among the problems concerning DCC, the DC capacitor voltage balancing problem is of great significance yet difficult to resolve. In this paper, the DC voltage of a five-level DCC is balanced using an object function optimizing scheme based on a proposed...
With a large amount of non-linear power load being used in power system, this situation gives rise to serious situation for harmonic reactive power. Nowadays, the static reactive power compensator is the most widely-used reactive power compensation equipment; however, it brings lots of harmonic wave to the power grid, and moreover, its poor reactive control and bulky volume can also bring lots of...
Aiming at the problem that the line losses calculation software of the tradition distribution existence, according to the distribution of PingLiang area radiate characteristics, developing a 6–10 kVs to the distribution line losses calculation and analysis system. The system chose to use the SuperMap company of Chinese science the VB development language to carry on gather developed to the distribution...
VSC-HVDC composed by full-controlled converter units is more flexible transmission schemes compared with traditional HVDC. It is necessary to study its control mode. This paper first analyzes the steady-state model of VSC-HVDC, then obtains the relationship among modulation wave phase δ, modulation degree m, active power and reactive power. When it is connected with active network VSC-HVDC can be...
The unified power flow controller is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the control and optimization of power flow in electrical power transmission system. In this thesis the control of real and reactive power flow through a transmission line with the use of UPFC at the sending end is investigated. Computer simulation using...
Based on traditional reactive power optimization model, a new multi-objective concordance evolutionary algorithm (MOCEA) is proposed for the active power loss, voltage deviation, static voltage margin and reactive power compensation capacity. The algorithm combines the multi-objective decision-making concordance model with group evolution thought organically. In a limited group each individual is...
This paper focus on the characteristics of photovoltaic power changing along with light intensity, and compare the reactive power exchange between system and microgrid according to the different photovoltaic permeability in a microgrid. A method of dynamic reactive compensation capacity in a micro grid considering the different photovoltaic permeability is proposed, The simulation demonstrate the...
Reactive power compensator of a phase-control capacitor and its characteristics are presented in this paper. Its operating principles and main circuit's structure are described. When simulated by Matlab, the conduction angle of Gate Turn-Off Thyristor is adjusted, the voltage and current of the capacitor are changed, and the persistent current is derived in a period which can lead the equivalent electric...
When comprehensive planning has been finished, the campus environmental design becomes the point of new campus. The new departments and campuses have been broken the traditional mode. People have taken more consideration into their grown and development in future, and the vision of covering with wood like the suburb. They need to construct landscape culture quickly to parallel traditional colleges...
Micro-grid is a novel unit integrated by distributed generation access to distributed network, and it is also the trend of the development of the future. Suitable micro-grid control strategy design is the key for ensuring the stability of the micro-grid under different operation mode, especially when changing from the grid connected operation to the islanding operation. This paper presents a droop...
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