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The integration of photovoltaic sources to conventional grid and increased utilization of nonlinear loads yield major power quality issues in the distribution system. Such power quality issues are commonly reduced by photovoltaic fed distributed static compensator (PV-DSTATCOM). In this paper, a comparative analysis of the PV-DSTATCOM performance for different controllers is shown. The controllers...
In this paper, a modulation strategy based on zero-sequence voltage injection is proposed for module multilevel converter (MMC). By the proposed method, the remaining capacitor voltages not vary and the line-to-line voltages are balanced. This method is easy to be implemented by adjusting the voltage injection coefficient when SM fault occurs. The coefficient of injected zero-sequence voltage is designed...
The concept of HVDC taps drawing small amount of power from HVDC lines to the rural places has been considered for several decades. Most of the earlier tap converters were limited by its loss, cost, reliability, and control difficulties. However, in this paper, the emerging modular multilevel converter (MMC) is adopted as the series HVDC tap, which reveals significantly improved performance and feasibility...
The distribution system voltage volatility caused by changing load conditions and penetration of renewable resources presents an increasing challenge in the grid integration of renewables. This paper presents a novel voltage regulator, or field upgradeable transformer (FUT), for the distribution system, targeting at direct voltage regulation at the customer side with a fast dynamic response. Proposed...
Single phase inverters are commonly used to transfer energy from a source to the crucial appliances or emergency power system. In this study a new model based robust controller for a single phase inverter under the constraint that the output filter parameters are not exactly known is presented. The nonlinear robust controller ensures the output voltage with lowest distortion, desired amplitude and...
The interlinking converter in an AC/DC hybrid micro-grid plays a crucial role in the stable operation and power allocation of power system. A bidirectional droop control method for the converter is proposed, which measures the power demand degree of AC sub-grid and DC sub-grid according to AC bus frequency and DC bus voltage respectively, and determines the direction and magnitude of the converter...
This paper shows that the smart loads could be effective in mitigating voltage problems caused by photovoltaic (PV) generation and electric vehicle (EV) charging in low voltage (LV) distribution networks. Limitations of the previously reported smart load configuration with only series reactive compensator (SLQ) (one converter) is highlighted in this paper. To overcome these limitations, an additional...
This paper presents the regenerative braking design control and simulation of a hybrid energy storage system (HESS) for an electric vehicle (EV). The EV is driven by two 30 kW permanent magnet synchronous motors. The HESS contains a Li-Ion battery and an Ultra-Capacitor (UC) sources. In extreme braking conditions, the UC should be able to recover all the power delivered by the motors. When the maximal...
This paper proposed a decoupling predictive current control method for the application of traction line-side converter in high-speed railway. The method adopts a decoupled discrete-time model of the system to predict the future value of input current for all possible voltage vectors generated by the converter. Considering the calculation time, two-step prediction is taken in the scheme. The voltage...
This paper presents a dynamic model predictive voltage control (DMPVC) method for the single-input dualoutput (SIDO) flyback converter. In this converter, cross regulation is one of the most critical issues because its primary winding is shared by its secondary windings so that the two output voltages are interacted with each other. The proposed method has the ability to reduce cross regulation significantly,...
A power management control method is proposed for the three-phase-to-single-phase matrix converter (MC)-based solid state transformer (SST) linking two grids. The MC-SST presents low weight and high controllability with respect to a conventional line-frequency transformer. Moreover, the single-stage ac-ac power conversion and compact volume are achieved compared to a three-stage SST, owing to the...
In power systems, the intensive use of nonlinear loads causes several power quality problems such as current harmonic pollution. In order to reduce the current harmonic pollution, the shunt hybrid active filter (SHAPF) is the best solutions effectively. In shunt hybrid active filter systems SHAPFs, the design of dc link controller is a significant and challenging task due to its impact on the performance...
In this paper, a multilevel capacitor clamped buck converter is investigated for AC-AC applications. The proposed topology significantly improves the flexibility of distribution systems in applications such as data centers and residential / industrial power distribution in urban settings. This paper discusses the operation and control of the proposed topology for a load of 50 kVA and 0.9 power factor,...
The paper proposes an original DC-AC inverter that is based on combination of buck converter with standard three-level H-bridge inverter. This inverter uses simple feed-forward control in order to obtain almost sinusoidal output currents and voltages.
Electric vehicles (EV) can be used as distributed energy storage devices to provide to the smart grid different regulation services. However, to have enough impact in the grid, the trend is to jointly manage a set of EV by means of a new stakeholder called aggregator. Knowing the availability, mobility habits, and the state of charge (SOC) of each EV battery, the aggregator performs the allocation...
The paper is dedicated to problem of current sharing of paralleled DC-DC converters in order to provide balanced loading of DC-DC converters with common DC bus. Cascaded control system structure is considered where, at first, an inner multivariable current proportional controller is designed and then, at second, an outer voltage integral controller is constructed in order to keep the desired output...
This paper presents a technique to control the output voltage of series-parallel (SP) topology inductive power transfer (IPT) system by using only a primary side controller which reduces cost, size, complexity and loss compared to the conventional IPT dual-side controller. The duty cycle of the inverter output voltage is controlled by a controller located in the primary side which keeps the DC output...
Inverter-based distributed generation and related power quality problems have received much attention in recent years. Low-voltage ride-through (LVRT) is becoming mandatory in low-voltage system due to both security requirement and power-quality consideration. This paper presents a LVRT strategy for grid-connected inverter to compensate both positive-and negative-sequence reactive power to boost fundamental...
One of the most popular issues in the power distribution is the quality improvement due to the increased usage of power electronic based loads. This paper analyse the performance of Unified Power Quality Conditioner which is the combination of Series Active Power Filter (SAPF) and Shunt/Parallel Active Power Filter (PAPF) sharing a common DC bus capacitor. A Left Shunt UPQC (LS-UPQC) configuration...
Conventional three-phase MMC consists of six-arms, each arm is controlled to generate unipolar voltage ranging from zero to Vdc where Vdc is the input DC voltage. Each arm voltage has two components (DC and AC components). In this work, the operation of MMC with reduced number of arms (four arms only), correspondingly reduced cost is presented. This mode can be also used with the conventional three-phase...
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