This paper investigates the problem of appropriate load sharing in an autonomous microgrid. High gain angle droop control ensures proper sharing, especially under weak system conditions. However, it has a negative impact on overall stability. Frequency-domain modeling, eigenvalue analysis, and time-domain simulations are used to demonstrate this conflict. A supplementary loop is proposed around conventional each DG converter stabilize while using high gains. Control loops based local power...

To meet the fast-growing energy demand and, at same time, tackle environmental concerns resulting from conventional sources, renewable sources are getting integrated in power networks to ensure reliable and affordable for public industrial sectors. However, integration of ageing electrical grids can result new risks/challenges, such as security supply, base load capacity, seasonal effects, so on. Recent research development microgrids have proved that microgrids, which fueled by managed...

This paper proposes a method for power flow control between utility and microgrid through back-to-back converters, which facilitates desired real reactive microgrid.In the proposed strategy, system can run in two different modes depending on requirement mode-1, specified amount of are shared converters.Mode-2 is invoked when that be supplied by distributed generators (DGs) reaches its maximum limit.In such case, rest demand has to utility.An arrangement DGs achieve load sharing both grid...

A novel H-bridge multilevel pulsewidth modulation converter topology based on a series connection of high-voltage diode-clamped inverter and low-voltage conventional is proposed in this paper. dc link voltage arrangement for the new hybrid asymmetric solution presented to have maximum number output levels by preserving adjacent switching vectors between levels. Hence, 15-level can be attained with minimum power components. comparative study has been carried out present high performance...

The operation of multiple microgrids (MGs) in coordination with distribution system enables high penetration locally available distributed energy resources (DERs). This approach enhances the reliability and resiliency power supply significantly. Also, overall cost gets reduced because integration cost-free from photovoltaic panels wind turbines. most effective utilization DERs can be achieved through networked MGs. However, implementation concepts MGs requires extensive research. paper...

A dynamic voltage restorer (DVR) is a power-electronic controller that can protect sensitive loads from disturbances in the supply system. In this paper, it demonstrated device tightly regulate at load terminal against imbalance or harmonic source side. The behavior of studied through steady-state analysis, and limits to achievable performance are found. This analysis extended study transient operation where generation reference DVR discussed. Once signals generated, they tracked using...

This paper presents a new approach for generating reference currents an active filter and/or static compensator. It is assumed that the compensator connected to load may either be in star or delta. The can unbalanced and also draw harmonic currents. purpose of compensating scheme balance load, as well make supply side power factor desired value. authors use theory instantaneous symmetrical components obtain algorithm compute three phase which, when injected system, produce results. They...

This paper proposes new droop control methods for load sharing in a rural area with distributed generation. Highly resistive lines, typical of low voltage networks, always create big challenge conventional control. To overcome the conflict between higher feedback gain better power and system stability angle droop, two have been proposed. The first method considers no communication among generators (DGs) regulates converter output ensuring proper having strong coupling real reactive due to...

The paper discusses load compensation using a distribution static compensator (DSTATCOM). It is assumed that the DSTATCOM associated with remote from supply. shown operation of assuming it connected to stiff source in such situations will result distortions current and voltage at point common coupling. To avoid this, parallel filter capacitor allows high frequency component pass. However, this generates control issues tracking, as standard controls hysteresis are not suitable these...

The paper discusses the operating principles and control characteristics of a dynamic voltage restorer (DVR) that protects sensitive but unbalanced and/or distorted loads. main aim DVR is to regulate at load terminal irrespective sag/swell, distortion, or unbalance in supply voltage. In this paper, operated such fashion it does not absorb any active power during steady-state operation. Hence, DC capacitor rather than source can inverter realizing DVR. proposed operation verified through...

In this paper, the method of triangular carrier switching control two-level inverters is extended to cascaded multilevel using phase-shifted multicarrier unipolar pulsewidth modulation (PWM). The condition for smooth obtained Bessel's function representation PWM output and multilevel-inverter-controlled system. A proposed determination minimum amplitude at fixed frequency. It shown that based on carriers significantly reduces ripple magnitude in allows use a smaller under closed loop. This...

This paper compares the performance of angle and frequency droops in an autonomous microgrid that only contains voltage source converter (VSC) interfaced distributed generators (DGs). As a VSC can instantaneously change output waveform, power sharing is possible by controlling DGs through droop. The droop able to provide proper load among without significant steady state drop system. It shown variation with controller significantly higher than controller. derived from DC flow. Both...

This study presents a new DC–DC multi-output boost (MOB) converter which can share its total output between different series of voltages for low- and high-power applications. configuration be utilised instead several single power supplies. is compatible topology diode-clamed inverter in the grid connection systems, where boosting low rectified output-voltage DC link capacitors required. To verify proposed topology, steady-state dynamic analyses MOB are examined. A simple control strategy has...

To dynamically reduce voltage unbalance (VU) along low distribution feeders, a distributed intelligent residential load transfer scheme is proposed. In this scheme, loads are transferred from one phase to another minimize VU the feeder. The central controller, installed at transformer, observes power consumption in each house and determines house(s) be an initially connected another. carried out by help of static switch, with three-phase input single-phase output connection, through which...

This paper focuses on the development of multilevel hysteresis current regulation strategies. Two such strategies have been discussed and some modifications in their control tasks proposed to achieve more reliable improved performance. In general, multiband concept has used while making proposals. The band size considerations also presented by taking into account desired existing system conditions. modulation schemes applied a five-level flying-capacitor inverter, whose operation under mode...

This paper proposes a new connection for unified power quality conditioner (UPQC) to improve the of two feeders in distribution system. A UPQC consists series voltage-source converter (VSC) and shunt VSC both joined together by common dc bus. It is demonstrated how this device connected between independent regulate bus voltage one while regulating across sensitive load other feeder. Since different (lines), will be called an interline (IUPQC). The structure, control capability IUPQC are...

The output voltage quality of some the single-phase multilevel inverters can be improved when their dc-link voltages are regulated asymmetrically. Symmetrical and asymmetrical diode-clamped have problem capacitor balancing, especially power factor load is close to unity. In this paper, a new single-inductor multi-output dc/dc converter proposed that control inverter asymmetrically achieve enhancement. circuit presented explained main equations developed. A strategy in details. To validate...

Often voltage rise along low (LV) networks limits their capacity to accommodate more renewable energy (RE) sources. This paper proposes a robust and effective approach coordinate customers' resources control in LV networks, where photovoltaics (PVs) are considered as the RE The proposed coordination algorithm includes both localized distributed strategies. strategy determines value of PV inverter active reactive power, while coordinates storage units (ESUs). To verify effectiveness approach,...

In this paper, an integrated methodology is proposed for planning distribution networks in which the operation of distributed generators (DGs) and cross-connections (CCs) optimally planned. Distribution lines high-voltage/medium-voltage (HV/MV) transformers are also upgraded order to improve system reliability minimize line losses under load growth. An objective function constituted, composed investment cost, loss cost. The energy savings that result from installing DGs included function....

This paper proposes a distributed control approach to coordinate multiple energy storage units (ESUs) avoid violation of voltage and thermal constraints, which are some the main power quality challenges for future distribution networks. ESUs usually connected network through source converters. In this paper, both ESU converters active reactive used deal with above mentioned issues. ESUs' is proposed be support, while utilized in managing loading. Two typical networks apply method, simulated...

To minimise the number of load sheddings in a microgrid (MG) during autonomous operation, islanded neighbour MGs can be interconnected if they are on self-healing network and an extra generation capacity is available distributed energy resources (DER) one MGs. In this way, total system shared by all DERs within those However, for purpose, carefully designed supply restoration control algorithm, protection systems communication infrastructure required at MG levels. study, first, hierarchical...

A new comprehensive planning methodology is proposed for implementing distribution network reinforcement. The load growth, voltage profile, line loss, and reliability are considered in this procedure. time-segmentation technique employed to reduce the computational load. Options range from supporting growth using traditional approach of upgrading conventional equipment network, through use dispatchable distributed generators (DDG). objective function composed construction cost, loss cost...