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Three-phase four-arm active power filter adds one arm to the three-phase three-wire active power filter. It adds a control variable but has the same control object. The paper introduces the control strategy of the three-phase four-arm APF. Then it analyzes Three-Dimensional Space Vector Pulse Width Modulation (3D-SVPWM) in the static abc coordinates. Finally, the simulation and experiment results...
Active power filter (APF) has been proved as effective means to compensate distorted and reactive currents caused by nonlinear loads. Proportion-Integral (PI) can not get zero steady-state error of output current due to its bandwidth limitation. A novel current control architecture in the synchronous rotating frame with ordinary PI and repetitive controller with feedforward is proposed to improve...
When two or more inductive heating coils are near and their sources are operating with different switching frequency, low-frequency noise occurs. In order to avoid such noises, this paper presents the constant frequency shift-phase power regulation for series resonant inverters. Leading leg switches always work at ZVS. Lagging leg switches work at ZCS when shift phase angle is bigger than load impedance...
A novel control scheme with PD output voltage instantaneous-value feedback inner loop for voltage-source inverter is proposed. The inner loop is designed to improve dynamic performance and the IMC-PID (internal model control-proportion integral derivation) external loop can ensure stable performance. The design methods of inner loop PD controller based on pole-assignment and external loop IMC-PID...
A novel power modulation method for resonant inverter and a simple and practical analog frequency auto-tracing circuit are proposed. The power modulation method when is compared with the pulse density modulation method exhibits the following advantages: simple implementation in analog or digital control; reduction of the inverter cost. Compared with the conventional frequency auto-tracing circuit,...
A novel control scheme with PD output voltage instantaneous-value feedback inner loop for voltage-source inverter is proposed. The inner loop is designed to improve dynamic performance and the IMC-PID (internal model control-proportion integral derivation) external loop can ensure stable performance. The design methods of inner loop PD controller based on pole-assignment and external loop IMC-PID...
Colloidal dispersions of Athabasca asphaltenes in toluene were studied at room temperature by small-angle X-ray scattering (SAXS). Both 5% and 15% dispersions were found to be polydispersed spheres with the main distribution peak at a concentration-independent average radius of 33 . The main distribution peak was skewed to the right, similar to a Schultz distribution. Owing to interparticle correlation,...
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