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Active power filtering has gained more importance in the power quality arena as it gives best solution for all power quality issues. Shunt active power filtering is effective and the performance of such units largely depends upon the control strategies used for reference current generation. There are different techniques used for this. Here an attempt is made to compare three major methods used for...
This paper proposed a novel single-phase soft-switching unipolar PWM active power filter (SSUPAPF). The proposed active power filter uses a simple auxiliary resonant circuit. The main switches of high-frequency arm operate at zero-voltage- switching (ZVS) turn-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The main switches of low-frequency arm operate at 60Hz to...
This paper proposes a three-port dc-to-dc power conversion circuit for small-scale distributed generation systems. With the three-port converter, the load can be powered from two different dc sources, which can be a combination of two from a solar-cell panel, a fuel-cell set, a battery bank, etc. The power conversion circuit consists of two active power switches by commonly using an inductor and an...
This paper presents a novel control method for a shunt current quality compensator, which combines the current quality compensation and dc-link voltage control together. The proposed control method can be applied in single-phase, three-phase three-wire and three-phase four-wire active power filter and hybrid active power filter. Compared with conventional methods, the proposed method has a great reduction...
A theoretical analysis, control and a simulation of a grid connected photovoltaic system using an output LCL filter is detailed in this paper. In order to reduce the complexity of the system, a linear voltage and current controllers have been developed for a three phase grid connected inverter. Those controllers simultaneously regulate the dc link voltage (the photovoltaic power is delivered to the...
An anti-windup technique for current control of Shunt Active Filters is presented. The main purpose of the proposed solution is to preserve the unconstrained tracking error dynamics, even under saturated conditions. A suitable modification of current references is imposed through the design of an additional dynamics. The proposed approach is valid for any kind of controller adopted to steer SAF current;...
This paper presents a novel control system for a five-level diode clamped converter based active power filter. The converter has an auxiliary circuit connected to its DC bus. A model based approach is adopted to design the control system. First, the converter state space model is obtained. Next, a multivariable controller is proposed to stabilize the DC bus capacitor voltages and a backstepping method...
In this paper, a new circuit configuration for the three-phase three-wire series active power filter is proposed to eliminate voltage harmonic components. This three-phase series APF is made up of a two-arm bridge power converter, a filter inductor set, a filter capacitor set and a capacitor/resistor filtering set. One phase of the three phase proposed APF, without control of the power electronic...
Power Quality issues are becoming a major concern of today's power system engineers. Harmonics play significant roll in deteriorating power quality, called harmonic distortion. Harmonic distortion in electric distribution system is increasingly growing due to the widespread use of nonlinear loads. Large considerations of these loads have the potential to raise harmonic voltage and currents in an electrical...
Non-linear loads are very common in present industrial facilities, office buildings and even in our homes. This loads present several Power Quality problems to the electrical grid. The conventional solutions do not solve these problems in a suitable way. Therefore, it is necessary to find new solutions such as Active Power Filters. This paper presents and discusses the main steps that are necessary...
For the problem of harmonic detection delay by the instantaneous reactive power method, a TS fuzzy logic along with synthetic sinusoid generation technique based shunt active power filter is proposed. The desired reference current are extracted using this algorithm and this method maintains the dc-side capacitor voltage of the inverter nearly constant. The VSI gate switching signals are derived from...
The DC-bus voltage self-regulating of Hybrid Active Power Filter (HAPF) is not only critical to compensation performance, but also to the safe operation. Traditional controller, e.g. P or PI, has disadvantages for these applications. Regarding the popular shunt HAPF with passive and active filters in serial connected, this paper presents a novel controller for the DC-bus voltage self-maintaining....
Multilevel inverters are suitable for power quality applications because the converter can be directly applied in medium voltage distribution systems. If the converter is not required to deliver active power to a load, a power source is not necessary, and the converter can operate only with capacitors on the DC side. This paper presents a strategy for the symmetrical cascade inverter that balances...
This study proposes a novel single-phase soft-switching active power filter (SSAPF) using a simple resonance unit. All main switches in the proposed SSAPF operate at zero-voltage-switching (ZVS) turn on, while the auxiliary switches operate at zero-current-switching (ZCS) turn off. The advantages of the proposed power filter include improved efficiency, reduced voltage stresses, and greatly reduced...
Due to increasing utilization of shunt active power filter (APF) in power systems, necessarily it has to be effective and reliable as much as possible. In this paper to enjoy of multilevel inverter advantages in active filtering task, a shunt APF based on flying capacitor multilevel inverter is presented. The power section of this active filter is viewed as analog to digital converter; as a result...
A simplified current reference control for single-phase shunt active power filter (APF) to compensate the current harmonics and reactive power required by nonlinear loads is being presented in this paper. The key intention of this method is to represent the APF in parallel with nonlinear load as an equivalent conductance. In the proposed technique, first the distorted voltage signal of PCC is made...
Grid interaction of DG units with a novel hybrid flying capacitor multicell converter which is suitable for hybrid systems, is presented in this paper. Multicell inverters have important advantages which make them a flexible solution for medium voltage/high power applications such as: lower rating of switches and lower output voltage THD. Proposed configuration of multicell inverter requires less...
This paper presents a three-phase, five-level cascaded multilevel voltage source inverter based active filter for power line conditioning to improve power quality in the distribution network. The active filter compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory...
A strategy is presented for the control of a 4-limb flying-capacitor multi-level inverter (FCMI) as an active power filter for unbalanced load conditions. Improved reference tracking is achieved using a modified deadbeat controller, and a naturally-balanced 3DPWM technique enables sensor-less flying-capacitor voltage control. Simulation results show the effectiveness of the proposed scheme.
Multilevel inverters are going to supersede conventional 2-level inverters especially in high power applications, because of their merits such as possibility of direct connection to increased voltage network, flexibility, lower electromagnetic interference (EMI), higher efficiency, lower device switching and suppression of offensive harmonics which generate by inverter itself. One of these applications...
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