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The digital current control method of switching converters studied in this work is based on taking more than one sample per switching period of the instantaneous current error waveform. To correctly regulate the average current value, as well as to simplify the system model, the controller must include a ripple filter. The proposed system includes a new low-phase-lag ripple filter. The whole system...
A new three-phase three level inverter topology is proposed in this work. The presented structure is characterized by the use of a Bidirectional Neutral Point Clamped (BNPC) in order to compensate harmonics and to eliminate the reactive power and load varying under sever source voltages conditions. The control technique is based on Lyapunov candidate. An energy-based Lyapunov control strategy is developed...
The output voltage references in grid connected Voltage Source Converters must be limited according to the available dc voltage to avoid over-modulation and windup of the current controllers. This may be especially critical for Active Power Filters (APFs), since uncontrolled over-modulation can cause unintended harmonics in the output voltage and interfere with the harmonic compensation. This paper...
With increasing rare earth prices and the claim for cost effectiveness of electrical drive trains especially induction generator solutions might turn into focus as preferable alternative to permanent magnet synchronous generators, even in spite of the lower power density. But an induction generator requires reactive power either provided by capacitors or by a self commutated power converter to ensure...
Control design for plants having more outputs than inputs (tall plants) must deal with a fundamental constraint. This constraint arises given that, in general, zero stationary error cannot be achieved in all channels for arbitrary references and disturbances. In mathematical terms, this is due to the fact that the plant transfer function is not right-invertible. In this paper a real p×m (with p >...
The analytical approach for the proposed method is carried out in this paper. The dynamic characteristics are discussed by using Nyquist diagram. Compared with the conventional PID control, the stability region of proposed method expands. It is confirmed in the simulation. Moreover, the transient responses of conventional PID control and proposed method are discussed in the stability region. In the...
MMC Passivity-based PI Controller: A novel nonlinear global tracking controller was proposed by extending the regulation case. It consists in a linear PI that regulates two constructed signals with respect to which the incremental model of the MMC becomes passive. Estimation of xk: A closed-loop estimator was proposed to estimate the MMC variables in steady state needed as input for the non-linear...
Low range differential air pressure sensors are used widely in various applications. In this paper the effects of temperature change on transient behavior of the calibration setup for differential air pressure sensors, due to temperature gradient are analyzed. A high performance reference setup utilizing ideal gas law, for differential air pressure sensors, is selected for experimental analysis. The...
Maximum power point tracking (MPPT) algorithm with a single output voltage sensor for a photovoltaic (PV) system is presented in this paper. The MPPT algorithm is developed by considering the slope (dV0/dD) of V0 − D characteristics. In this method only a voltage divider circuit is used to sense the converter output voltage (V0). The steady state behavior, tracking performance for a change in insolation...
A coupled inductor boost converter with the enhanced equivalent series resistance (ESR) of the filter capacitor for DC microgrid applications is presented in this paper. The converter uses only four state variables and shows a fourth order minimum phase behavior, i.e., right half plane (RHP) zero gets completely eliminated. The display of minimum phase behavior of the proposed converter makes it linear...
This paper introduces a new method of fault diagnosis for induction motors, the Multilayer Park's Vector Approach, derived from the well-known fault diagnostic method based on Park's Vector Approach analysis. This new method allows the detection of failures in steady and transient regimes operation on induction motors. The resulting vector generated provides the information about deviations in the...
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