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In order to avoid the harmonics of traction power supply system delivered to superior power system substation and have a detrimental effect on the quality of public power grid, the scheme, substation equipped with passive filters, processing the problem of harmonics delivered to power system substation was proposed in this paper. Based on the measured data of the system substation, the single-tuned...
In an electrolytic capacitor-less single-phase to three-phase inverter, a control bandwidth limitation adversely affects the source current response. Since the inverter does not energy buffer such as an electrolytic capacitor, the spatial harmonics of motor cause the source current harmonics. Moreover, d-axis current reference of the system is obtained by trial and error in off-line. This paper proposes...
This paper describes a development of a high power density power converter using flying capacitor multilevel circuits for PV systems. To connect the PV systems to a power grid, a power conditioner system (PCS) is required. Sine wave filters and EMI filters are required to satisfy harmonics regulations such as CISPR. These filters are dominant in a total volume of the PCSs. To design a small PCS to...
In large furnace industry in Thailand, power factor has become a concerned issue due to electric utility department that charges extra money from factory causing low power factor. Many factories have been using capacitor bank to compensate reactive power, thus, increasing power factor in factory. With the capacitor bank, power quality in terms of harmonic current has become problem due to the switching...
We push forward setting of the elevator for barrier-free and exchanging of the LED light for energy saving in stations. But harmonic currents may increase by these facilities in the power distribution network. It is effective to take measures for harmonic currents from the design phase. In this paper, the method of this report can estimate harmonic current emissions in case of stations improved by...
This paper presented the design and implementation of an induction motor drive. In order to improve energy efficiency of this drive, system configuration comprised a single to three-phase converter with additional circuitry for PFC. In this design, using TI's UC3854 as the PFC controller chip, and the related parameters were designed. The control scheme was based on V/f control using two low-cost...
Multilevel converters can generate the multilevel output voltage using internal voltage sources. Thus, they can reduce harmonics and EMI. From the practical point of view, implementation of the source of multilevel voltage without increase in the volume of the converters is strongly desired. In this context, the flying capacitor multilevel converters are most promising candidates for the practical...
This paper presents an Active Disturbance Rejection Control (ADRC) technology and PI-fuzzy compound technology method for Active Power Filter (APF). The ADRC consists of Tracking Differentiator (TD), Extended State Observer (ESO) and Nonlinear State Error Feedback law (NLSEF). This control method makes full use of the error driven control law, the modern control theory and the nonlinear feedback control...
This paper presents a novel space vector modulation (SVM) which reduces current harmonics flowing through a DC-link capacitor of a three-level inverter employed for three-phase motor drive systems. In order to reduce the input current harmonics, the space vectors are selected to minimize the difference between the instantaneous value and the average value of the input current by using the magnitude...
This paper presents the prediction of dynamic and steady state operation of the single phase capacitor start capacitor run induction motor for different values of capacitor and same frequency of voltage supply at no-load and full load condition with open loop and closed loop system. AC power from the mains is considered as a reference and multiple possibilities of a single inverter topology are fed...
A comparative analysis of z-source inverter and two stage DC-DC converter fed Voltage Source Inverter (VSI) for single phase R-L load is presented in this paper. For most of the PV applications, the conventional VSI has been used which requires an additional boost converter to boost output voltage. A single stage power conversion topology which can give both voltage buck and boost properties is provided...
Single-phase inverter suffers from double-frequency power ripples in the input side transferred there from the ac-side. To mitigate this ripple, two types of power decoupling approaches can be applied: passive power decoupling and active power decoupling. We present a technique of passive power decoupling realized by modifying the control strategy. The main idea is to produce the time-varying shoot-through...
Modular multilevel converters generate high voltage ripple in the floating capacitors which increases the harmonic content of arm voltages and currents and consequently the losses and can degrade the control performance. In order to reduce this voltage ripple, a large capacitance is usually employed, but the size and cost of the submodules and the whole converter are increased. In this paper the voltage...
This paper presents a new design strategy for S-LCC type compensation network in Inductive Power Transfer (IPT) systems. It was found that four resonant elements (three capacitors and one inductor) can compose two symmetric T type resonant tanks, which is well-known for its impedance transformation characteristic and reciprocity between voltage source and current source. A simplified analytical technique...
This paper proposes a new circuit topology of MMC for DC to AC applications. The main advantage of the proposed topology is the elimination of lower arms of conventional MMC. Additionally, the DC bus voltage magnitude is half compared to conventional MMC. This is achieved by replacing the lower arms of conventional MMC topology with LC filter. The LC filter is designed to be a second order band stop...
This paper presents a control strategy of modular multilevel converter which produces single phase AC output from a three phase AC source. With the proposed strategy, the magnitude and frequency of the output AC voltage of the converter can be controlled while the input 3 phase voltage is maintained at a fixed magnitude and frequency. Thus, the converter acts as a direct AC-AC converter without any...
Low frequency switching of voltage source inverters generates low order harmonic voltages in the output causing torque and speed ripple. In this paper, a multilevel space vector diagram formed by nine-concentric octadecagons (polygons with 18 sides) using a single DC source is presented which eliminates lower order harmonics till seventeenth order from the phase voltage output over the entire modulation...
A single phase inverter feeding AC loads injects a substantial pulsation of the second order harmonic current (SHC) ripple at DC link. Moreover, this ripple may propagate to the DC source in the absence of the suitable controller or large size DC link capacitor. This paper proposes a SHC ripple reduction technique based on the sliding mode control for the DC microgrid application. The control technique...
This paper proposes a novel approach to design the LCL filter for grid interfaced PV system. A cost based minimization approach on a cost per joule basis for each of the filter elements is explored to obtain the optimal filter design. Simulation results for a 10 KVA grid connected inverter with LCL filter are presented in order to verify the behavior of the proposed design. The impact of designed...
This paper presents the dynamic performance analysis of grid connected Z-source inverter (ZSI) based distributed generation (DG). ZSI provides a single stage buck boost conversion which reduces the switching losses and becomes an economical option for DG systems. The standards set by the utility is met by the ZSI even during variable input conditions by regulation of shoot through duty ratio. The...
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