The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents drive performance comparisons among three-types of current profiling techniques minimizing torque ripple for switched reluctance (SR) motor in terms of current ripple, a number of switching of converter, motor efficiency and noise. As SR motors have strong magnetic nonlinearity, hysteresis current control is commonly used for their drives. In this case, however, switching frequency...
Railway traction has become an important part of power system. It creates power quality issues in the grid. Negative sequence and harmonic currents have become the main issues in high speed train traction systems. Railway static power conditioner (RPC) has been developed to mitigate the power quality issues. A comprehensive technique for compensation of negative sequence and harmonic currents has...
For current tracking control problems in Active Power Filter (APF), a Recursive Integral PI controller based on iterative control is designed in this paper. Considering the control reference signal is Periodic signal, it combines iterative control with Recursive Integral PI controller. Recursive Integral PI control algorithm is used to eliminate the steady-state error of the system, while iterative...
In this paper, photovoltaic (PV) grid-connected inverter which is the core device in PV grid-connected system has been in depth research. The current tracking control method is used in the inverter. In structure, this inverter consists of a DC/AC inverter and several connectors for switching and protection. A full bridge structure with the power frequency transformer has been applied in the DC/AC...
Active Power Filter (APF) has been widely used to compensate the harmonic currents which are generated by the nonlinear load. Its compensation performance mainly depends on the design of controller. In this paper, a novel control method based on recursive integral PI algorithm and repetitive control strategy has been proposed. Compared with traditional PI control which can not get zero-steady-state...
At present, the One-Cycle Control of Active Power Filter has two serious problems. One is that this method can just compensate the harmonic and reactive power at the same time, which can not be eliminated separately. The other is that the tracking current will be affected and have huge error when the mains voltage appears distortion. So, through the hard work, in this paper, we adopt the method to...
In this paper, the mathematical model and work principle of the three-phase voltage source pulse width modulation (PWM) rectifier (VSR) are analyzed. Then, the control strategies without feed-forward and with feed-forward are compared, which based on the power factor, the total harmonic distortion (THD) and DC voltage stability. Voltage-Oriented Control (VOC) and direct current control method were...
Analysis and control of power quality by neural network is a new research field in electrical power system. To avoid the deficiencies of current tracking control, this paper presents a new instantaneous current PWM control that based on neural network. Combining wtth ip-iq detecting method that based on instantaneous reactive power theory, a three-phase shunt active power filter (SAPF) for reactive...
ldquoHarmonic transfer through convertersrdquo has caused waveform distortion in multiterminal dc systems based on a voltage-source converter (VSC-MTDC). The harmonic transfer can be by the positive and negative sequences or by the zero sequence. A comprehensive solution consists of decoupling the ac side from the dc side of the VSC. Such decoupling has other benefits in VSC-MTDC because disturbances...
Active power filter (APF) has been widely recognized as a substitute for classical passive L-C filter in eliminating the power line harmonics/reactive current due to nonlinear loads and switching devices. Under nonlinear loads, for eliminating harmonic currents with APF, the inverter must be commanded to output compensating currents which are time- varying with rapid vibrations. Therefore, the tracking...
Active power filter (APF) based on voltage source inverter (VSI) is one of the important measures to deal with the power quality problem. Mathematically, the APF model in a power grid is a typical nonlinear one. The idea of passivity is a powerful tool to study the stabilization of such a nonlinear system. In this paper, a state-space model of the four-leg APF is derived, based on which a new Hinfin...
Based on the time-domain analysis, a time-domain mathematical model of three-phase three-wire active power filter (APF) current control loop is established; Predictive control equation and its optimal feasible solution with minimum objective function value are gotten, and the sliding-mode control strategy of current control loop is deduced. A novel optimization-sliding mode control strategy is proposed,...
Active power filter (APF) based on voltage source inverter (VSI) is one of the important measures to deal with the power quality problem. Mathematically, the APF model in a power grid is a typical nonlinear one. The idea of passivity is a powerful tool to study the stabilization of such a nonlinear system. In this paper, a state-space model of the four-leg APF is derived, based on which a new H00...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.