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This paper presents the application of a modular multilevel cascade converter(MMCC) based on single-delta bridge cells(SDBC) as an active power filter(APF). It is required that the mean value of the DC capacitor voltages is controlled so that the tracking of the source current reference is guaranteed in operation of APF. This paper proposes a DC capacitor voltage regulation method for MMCC-SDBC under...
The aim of this paper is the design and implementation of the control algorithm of a PWM boost rectifier capable to handle bidirectional energy flow. For this goal, the boost rectifier control loops must be tuned for the proper operation of absorbing active power from the power grid and transfer it to the dc load at constant output voltage, and also to give the rectifier the ability to generate back...
The paper presents the methodology and design of testing structure dedicated to one laboratory model of a filtering and regeneration system (SISFREG) developed through the project number 42/2014, type Partnerships — PCCA 2013, which allows the conversion of the dc traction substations in "active substations". The configuration was made based on the actual conditions prevailing in a substation...
Although the mechanism of electric energy flow for nonsinusoidal conditions is well described today, so fare is not yet available a generalized power theory, and theoretical calculations for the design of such devices as active filters or dynamic compensators. Therefore the task of designing compensators for optimize energy transmission with nonlinear time-varying loads in nonsinusoidal regimes is,...
This paper presents a new application of modular multilevel cascaded converters (MMCC) for combined active harmonic current elimination and reactive power compensation in a power distribution line. A technique for simultaneous extracting harmonic components and reactive element in the load current is presented. A novel voltage control scheme for balancing the module intra-cluster capacitor voltages...
Inverters in back to back (B2B) connection are utilized to convert the voltage and frequency of the power source to another format. Typical application of inverters is the wind power system. This study presents a B2B inverter for equal voltage and frequency format conversion in which one inverter works to get power from the grid to charge the DC capacitor and another inverter returns most of the active...
The aim of this paper is the implementation of the control algorithm of an active DC traction substation using the dSpace DS1103 DSP control board. The adopted current control method is the indirect current control, which assumes that the current regulator controls the power grid current instead of the active filter output current. The active character of the traction substation is given, on one hand,...
Growing the use of nonlinear devices for purpose of the controlling the machines as per our definition. These circuits are based on power semiconductor switching devices which are for most of harmonic source in our network. Due to negative effect of harmonics, the filtration of it must require. The active power filter is most superior solution in eliminating unwanted harmonics. This paper will speak...
Unbalanced grid voltage dips may lead to unbalanced non-sinusoidal current injections, dc-link voltage oscillations, and active and/or reactive power oscillations with twice the grid fundamental frequency in three-phase grid-connected Photovoltaic (PV) systems. Double grid frequency oscillations at the dc-link of the conventional two-stage PV inverters can further deteriorate the dc-link capacitor,...
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...
Advancement in technology and rapid industrialization towards extensive use of power electronic controlled devices and enormous growth towards agriculture sector in rural areas of electrical distribution system resulted in substantial increase of power quality issues as well as reactive power requirement. Voltage drop in the system due to huge active and reactive power requirements of the loads can...
By the way of establishment of mathematical model for three-phase four-wire T-type three-level Active Power Filter (APF), the relation of DC-link voltage difference, the neutral current and the duty-ratio of each bridge arms are revealed. Consequently, a control strategy of DC-link voltage balancing is proposed with the controllable neutral current injection, which is easier to be realized and more...
This paper presents a three-phase Shunt Active Power filter (SAPF) with PI control capacitor voltage regulation technique. In order to mitigate current harmonics in the source current Shunt Active Power filter is used. Quality power must be provided for safety, better operation of modern appliances and electric drives. In the modern world most of the automation works uses robots, drives which uses...
This paper proposes a simple power circuit topology for single phase unified power quality conditioner (UPQC). The number of power circuit switches of conventional single-phase UPQC is reduced to half and hence it has resulted in considerable reduction of cost, weight, volume, protection circuits, power losses and control circuit complexity. The proposed system compensates for the utility voltage...
Shunt active power filters (SAPF) can be controlled using conductance signal related to the load active power. The distinctive feature of the considered control method is that certain changes of energy stored in the active filter's reactance elements are utilized as the source of information concerning the load power and then the reference signal for the SAPF action. Particularly difficult SAPF operating...
The Modular Multilevel Converter (MMC) has enhanced the feasibility of Multi-Terminal DC grids (MTDC). For controlling the DC bus voltage in the MTDC grids, the droop control is the most promised technique. This paper evaluates the dynamic impact of the way of controlling the MMC on the MTDC grids. Results are compared with a simplified model that highlights the key elements for the dynamic behavior...
This paper is focused on the optimal design of the controllers in an active filtering and regeneration system for DC railway traction substation. The control algorithm of the system is based on the indirect current control method and uses two closed loops with PI controllers: an outer one for the DC voltage control and the other for the grid current control. In order to perform the energy regeneration...
The use of series connected capacitors for high voltage applications has been proven to be beneficial for voltage stress reduction across power semiconductors. In a 3-phase grid any asymmetry in the value of the series capacitance may lead to significant variations in the voltage seen across the low voltage converter. This paper investigates the effects of an unbalanced set of series connected capacitors...
This paper proposes a new control method suitable for active power filters to reduce the dc capacitor voltage ripples associated with the third-order harmonic current compensation. The proposed method superimposes a negative-sequence fundamental current on the compensating current to cancel out the active power ripple caused by the third-order harmonic current. As a result, the proposed method has...
Harmonics have been considered as one of the major issues in future power grids. With the increasing demand in advanced control functions, power electronic converter interfaced Distributed Generators (DGs) are expected to perform harmonic compensation when necessary. It has been demonstrated in a number of studies that DG converters operating in Voltage-Controlled Mode (VCM) can be easily configured...
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