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Hybrid modeling method provides a natural way to model the power converter, it describes the behavior of the converter more accurately in sense of no approximation. The switching control method based on the hybrid model can realize the stable regulation of the output voltage. However, the switching controller designed based on the common Lyapunov function (CLF) would lead to steady state error, when...
This study mainly focuses on the development of an adaptive control scheme for a single-stage boost inverter. First, the dynamic model of a single-stage boost inverter is analyzed and built for the later control manipulation. Then, an adaptive control scheme is designed. The effectiveness of the proposed adaptive control scheme is verified by experimental results of a 1kW single-stage boost inverter...
This paper addresses the practically important question of when a nonlinear system can be asymptotically stabilized with a linear PI control, and show that it is possible if the system can be passified with constant control actions. This result is used to propose a constructive methodology to design PI schemes for switched power converters, which are viewed from a novel perspective: with the switches...
Bidirectional DC-DC converter is potentially used for an energy charging or discharging device; however, the converter displays highly non-linear characteristics since its internal system parameter varies depending on the operation mode and the disturbance engagement. To cope with the non-linearity, a bidirectional DC-DC converter based on time delay control (TDC) is designed and validated for lithium-ion...
This paper presents a comparative analysis of control methods to extract the maximum power and to track the maximum power point (MPP) from photovoltaic (PV) systems under changeable environmental conditions. The PV system consists of a solar module and a DC/DC converter, in this case a buck-boost converter, connected to a load. The maximum power point tracking (MPPT) algorithms compared are the perturb...
In this paper, a model based robust control for three-phase two-level grid connected power converters is studied. The proposed controller uses a Second Order Sliding Mode (SOSM) technique to develop the control law. The control objectives are to achieve desired dc-link capacitor voltage regulation and unity power factor. This requires controllers with fast response in the presence of external disturbances...
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...
Quasi-Z-source inverter (QZSI) can boost and buck the input voltage with only once power transformation. It is suitable for the grid-connected photovoltaic (PV) system with the wide variation of PV cells output. The composite control for PV grid-connected and energy-storage based on Quasi-Z-source inverter is researched in this paper. The energy balance between the pre-stage circuit and the post-stage...
This paper is concerned with the design of the power control system for a single-phase voltage source inverter feeding a parallel resonant induction heating load using shift-phase inverter control. The control of the inverter output current, meaning the active component of the current through the induction coil when the control frequency is equal or slightly exceeds the resonant frequency, is achieved...
This paper presents a new pulse width modulator dedicated basically for under determined systems. The solution of the under determined problem is performed by minimum 1-inflnity norm solution. One of known under determined system is a four-leg three-phase converter because four reference signals must be created from three control commands. The infinity norm enables to find proper solution to generate...
In this work, an adaptive control of a three phase ac/dc converter is investigated. The classical vector control method has been extensively used for the control of the ac/dc converter in different applications but the design gains are highly dependent on the system parameters. We employed an adaptive PI control method to cope with the system uncertainties. The method relies on a third order model...
This paper proposes a multi-loop controller for phase-controlled series-parallel resonant converter. Output voltage is solely measured for control and inner loop is used to enhance closed loop stability and dynamic performance compared to single-loop control. No additional sensors are used for inner loop variables. These are estimated using a Kalman filter, based on a linearized converter model. The...
The compound active-clamp zero-voltage switching (CAC-ZVS) three-phase power factor correction (PFC) converter is a kind of improved topology converter used for high efficiency and high power factor applications. The load of the converter varies with the working condition. The conventional control methods cannot adapt to such variation and lead to the degraded performance. To solve this problem, we...
In this paper, the Pan Boolean PI control for use in wind power grid-connected inverter is studied. The inverter consists of six IGBT switches and six 2-pole tubes, power of 2MW, SPWM PI control algorithm based on the Pan-Boolean and has three Pan Boolean PI controllers which control the wind turbine rectifier output voltage, active power and reactive power grid respectively, based on MATLAB platform...
In the process of power generation by hydrogen energy, the randomness of hydrogen, oxygen input and power output often appear, which puts forward higher requirements for the robust design of power converters. The inevitable chattering phenomenon do exist in the power converter based on traditional sliding mode due to its discrete control law. In order to conquer the above problems, this paper presents...
This paper investigates a novel control strategy of three-phase voltage source PWM rectifier (VSR) system with the combination of proportional-integral (PI) control method and sliding mode control method. To have satisfactory performances, the condition of uncertain disturbances and loads disturbances should be taken into consideration when designing the controllers. The whole double closed loops...
This paper presents an Optimal-Pole-Placement Control (OPPC) combined with Feedforward (FF) scheme to control a 1φ-3L-NPC-Inverter. The OPPC is an optimal linear state feedback control that improves the transient response time with controlled input/output current and voltage overshoot. The inclusion of a feedforward branch between the reference signal and duty-cycle strategy ensures null steady state...
This paper presents a discussion on the use of variable structure control, i.e., sliding mode control, for improving the dynamic control performance of a low-power wind energy conversion system (WECS) that is connected to a DC microgrid. The sliding mode control is applied to the wind turbine system to extract the maximum possible power from the wind, thus achieving the state of maximum power point...
In recent years, variable speed permanent frequency generation, as the main part of wind power generation, has been widely concerned by people. In this paper, choose direct-drive permanent magnet wind power system as the study system, based on the mathematical model of three-phase voltage type PWM inverter on the system grid, then make some improvements on the double-closed loop control strategy,...
Reactive power is the key controller in voltage regulation system. Distributed Energy Resources (DER) can be the solution to mitigate the voltage regulation problem with right control technique. DER can generate or consume reactive power with proper power electronics interface. It has also capacity to provide ancillary services. The new decentralize Adaptive technique has been implemented in this...
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