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In order to solve the poor dynamic characteristics and adjustment effect of traditional voltage filter control system of welding machine. In this paper, the mathematical model of the voltage filter control system of welding machine is established, and the fuzzy control rule is applied to the Voltage Control System, and two improved fuzzy control schemes including fuzzy-PID compound control and fuzzy...
This paper deals with the design of suitable control strategy for a dual input DC/DC converter. Nowadays, it becomes very essential to stabilize the output voltage of DC/DC converter for hybrid energy application. To achieve this objective, control of duty ratios of switches using different control strategies is proposed in this paper. Comparative analysis has been carried out between two control...
The Switched Z-source Isolated Bidirectional DC-DC Converter (SZIBDC) is a novel topology that inherits the advantages of Dual Active Bridge (DAB) while overcoming its disadvantages. This paper presents the small-signal model of open-loop SZIBDC firstly. After that, five kinds of close-loop control strategies based on PI-regulator or Fuzzy Logic Controller (FLC) are theoretically analyzed and validated...
The existing power transmission capabilities can be flexibly controlled and enhanced with the help of new technology called Flexible AC Transmission System (FACTS). This power electronics based technology can be used individually or in co-ordination with other controllers. Static VAR Compensator (SVC) is a shunt connected FACTS device, used for voltage control and for reactive power compensation....
Abstract-On the basis of traditional PI control for DC-side voltage of Active Power Filter(APF), a parameter self-adjusting fuzzy PI control method is designed in this paper. In order to adjust the parameter itself, it is can be used fuzzy control rules to control the fuzzy output variables according to fuzzy input variables. The simulation results show that the method has smaller overshoot, faster...
As the exact mathematical model of the active power filter (APF) is quite difficult to determine, especially when the load and the parameters are changing. Applying the ordinary proportional-integral (PI) controller with constant parameters cannot achieve ideal results. This paper introduces the adaptive fuzzy PI controller to the voltage control of the APF, which can achieve better tracing result...
This paper presents the speed control scheme of indirect vector controlled induction motor (EVI) drive. Voltage source inverter type space vector pulse width modulation (SVPWM) is used for PWM controlling scheme. An intelligent based on Fuzzy PI controller is developed for controlling the torque component Iq current of an EVI. The complete vector control scheme of the IM drive incorporating the FLC...
This paper presents a modified design of a sliding mode controller based on fuzzy logic for a dc-dc boost converter. Here a proportional - integral (PI)-type current mode control is employed and a sliding mode controller is designed utilizing fuzzy algorithm. Sliding mode controller ensures robustness against all variations and fuzzy logic helps to reduce chattering phenomenon introduced by sliding...
In this paper, a novel control algorithm has been proposed to regulate the DC bus voltage of a single phase shunt active power filter using a fuzzy logic controller. The DC bus voltage of a shunt active power filter should be controlled to compensate the filter losses on the grid. In many industrial applications, a PI controller is generally used to regulate the DC bus voltage of shunt active power...
This paper proposes a new regulator of the DC-link voltage of a variable speed wind energy conversion system based on adaptive critic designs (ACDs). A zero-order Takagi-Sugeno fuzzy rule base constitutes the core of the controller. A heuristic dynamic programming based approach is used to train the controller and enable it to provide nonlinear near-optimal control at different operating conditions...
This paper presents a novel Phase Locked Loop (PLL) circuit in conjunction with Proportional Integral (PI) or Proportional Integral Derivative (PID) or Fuzzy Logic Controller (FLC) based shunt Active Power Line Conditioners (APLC) for the power-quality improvement such as current harmonics and reactive power compensation due to the non-linear/unbalanced loads. The shunt APLC system is implemented...
Firstly, it introduces the different operating modes and control mechanism of the high-voltage DC transmission (HVDC) system and analyzes the fuzzy control theory. On this basis, using MATLAB, a typical 12-pulse HVDC transmission system model of the bridge has been simulated under the control of traditional PI and fuzzy intelligent respectively. Compared with the traditional control methods, the real-time...
PWM rectifier technology is introduced to the main Power Circuit of the charger for aircraft battery to enhance the charging efficiency of aircraft battery and improve its long term reliability and save its life in this paper. A new strategy of DPC Based on the Space Vector Modulation (SVM) is used in PWM rectifier, Meanwhile, a fuzzy PI controller is designed in DC voltage control loop. The simulation...
Proportional integral derivative (PID) controllers are usually used to control DC-DC boost converters in PV systems. However, they have to be tuned based on certain defined operating range using averaged mathematical models. Loading conditions have great effect on PI controllers; PI controllers are subjected to failure under dramatic load changes. This limits the PI controller's operating range. Moreover,...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
This paper presents a novel Adaptive Neural Fuzzy Inference System (ANFIS) based Matrix Converter for speed control of Induction Motor. The proposed ANFIS consists of fuzzy logic controller algorithm with a five layer Artificial Neural Network. The ANFIS system tunes the fuzzy system with hybrid learning algorithm and hence generates the reference voltage. The reference voltage is used to generate...
This paper aim to design a intelligent technique for BDC converter. The converter contains non-linear elements making the mathematical model more complex which instigate the use of FLC. The nature of FLC has adaptive characteristics that can achieve robust response to a system with uncertainty, parameter variation, and load disturbance. In order to see the advantages of FLC, classical PI control has...
This paper deals with the fuzzy logic based proportional-integral (FPI) regulators for voltage and frequency control (VFC) of an isolated asynchronous generator (IAG) in a wind energy conversion system (WECS). A three-leg voltage source converter (VSC) with battery supported energy storage (BSES) is used as a VFC. The VFC algorithm uses two fuzzy PI regulators, to improve the dynamic performance of...
This paper describes conventional and advanced methods for the control of D-STATCOM. The mathematical model of conventional double loop control, Direct-Output-Voltage (DOV) control, Decoupled DOV, Fuzzy-PI and Decoupled Fuzzy-PI based control is studied. The control scheme for the above approaches is implemented using Matlab Simulink platform. The dynamic response of the models are presented and compared.
Multibrid wind power generation system (MWPGS) has aroused more and more attention for its high energy conversion efficiency, high reliability, and flexible grid-connected power control. In order to achieve the decoupling regulation of the active and reactive power during the normal operation and enhance its capability of low voltage ride-though (LVRT) during grid voltage sag, a unified control strategy...
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