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The recent amendment to the IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems (IEEE Std. 1547a-2014) is unleashing the application of advanced inverter functionalities to help mitigate voltage regulation problems commonly encountered in areas with high levels of PV penetration. This paper describes the experimental testing of some of the important autonomous functionalities...
A dc-dc boost type converter is conventionally controlled using a PID controller. However; when a control algorithm is realized through a digital hardware; there is no need to persist with this simplistic form. This work presents a comparative study of servo and regulatory performances of two digital control algorithms; viz. modified Dahlin's controller (MDC) and Vogel-Edgar controller (VEC); when...
In a power system, switching on/off of large inductive loads causes a drop/rise in the voltage at the load bus due to increase/decrease in reactive VAR demand which may lead to voltage instability. Additionally, three-phase, four-wire distribution systems faces poor power quality problems such as unbalanced loading, excessive neutral current and voltage distortion due to current harmonics. In order...
The presence of unbalanced and nonlinear loads in distribution network degrades the quality of power, which causes several problems such as load unbalancing, excessive neutral current and also increases the requirement of reactive power. This paper proposes three-level flying capacitor inverter based distribution static compensator (DSTATCOM) for shunt applications. A new floating capacitors voltage...
A quantitative feedback theory based systematic design procedure is proposed for two-inductor boost dc-dc converter. The two-loop design proposed in this paper is effective in handling the uncertainties, both in model as well as in converter parameters. Compatible models are formulated, in discrete-time domain, to achieve this task. Minimum stability margin is enforced so as to keep the system within...
A high-gain boost point of load converter is proposed for point of load applications. In view of the high-gain characteristic, the converter gives freedom of connecting several smaller battery sources to a common dc-bus. The boosting of the proposed converter is higher than the traditional boost and some of the fourth-order boost converters. These boosting features are demonstrated through a steady-state...
On-chip voltage regulation using distributed Digital Low Drop Out (LDO) voltage regulators has been identified as a promising technique for efficient power-management for emerging multi-core processors. Digital LDOs (DLDO) can offer low voltage operation, faster transient response, and higher current efficiency. Response time as well as output voltage ripple can be reduced by increasing the speed...
With the development of power grid, capacitive reactive power in the grid continuously increases. When the system loading decrease, the system voltage will correspondingly increase, which will affect system security and the working life of equipment. As a flexible and convenient method, the leading phase operation has been used to decrease voltage of the power grid. In this paper, the principle and...
In present scenario of renewable energy generation systems, brush-less and magnet-less generators are becoming more popular due to merits such as high reliability, robustness, fault tolerant capability and almost maintenance free operation, etc. This paper deals with a brushless induction synchronous generator (BInSyG), where an induction and a synchronous machine are housed in the same structure...
A supervision algorithm of ancillary services for distributed active front-end in a small industrial microgrid is presented. A comparison between distributed and centralized control of the active front-ends aimed to achieve optimal voltage regulation within the grid and minimal harmonic distortion both close to sensible loads and at PCC is performed.
The recent exponential growth of utility-interconnected PV systems has led to changes to IEEE 1547 - the standard for interconnecting distributed resources with electric power systems. IEEE 1547a and IEEE 1547.8 are unleashing the application of advanced inverter functionalities, or grid support functions, for the purpose of minimizing adverse distribution system effects that are commonly encountered...
The paper presents a new output feedback control algorithm for a doubly-fed induction generator (DFIG). Vector control scheme is implemented to provide stand-alone load voltage magnitude regulation at constant frequency in restricted speed variation range. The control algorithm is designed in the stator voltage vector oriented reference frame using full-order DFIG model when only stator voltages,...
Vehicle-to-grid is a promising concept, which has a potential to provide ancillary services to the power grid such as peak load reduction, spinning and non-spinning reserve, and voltage and frequency regulation. This paper investigates the control method of a grid-connected inverter in vehicle to grid application for voltage regulation through reactive power control. The control technique is to maintain...
A large penetration of Distributed Generation (DG) may severely impact on the voltage profiles along LV distribution feeders. The first, cheapest and simplest step that can be undertaken is to involve DG units in the voltage control of the LV distribution networks, adopting a fully-decentralized architecture and avoiding any additional communication infrastructure. The paper proposes a design methodology...
In power flow analysis, the Newton-Raphson method is typically combined with heuristics for enforcing voltage regulation constraints. However, these heuristics can cause jumps and cycles in the numerical process that further degrade this method's limited robustness. In a previous work, mathematical optimization techniques were explored for developing a robust power flow method, but the voltage regulation...
Load power demand management is important both for final users and for Distributed System Operators (DSOs) in order to manage their network load profile. So several strategies were adopted to get this result, but nowadays the new technologies in electrical loads as lighting systems are changing the electrical loads behaviour. Therefore, it is necessary to reconsider techniques of voltage optimization...
In this paper, a nonlinear voltage control scheme based on sliding mode control (SMC) is proposed for the bidirectional isolated dual active bridge (DAB) DC-DC converters. The state space model is driven for the nonlinear controller design by using the harmonic functions of the converter output voltage based on the single phase shift modulation (SPSM). The proposed controller can provide the robust...
A large number of electric vehicles (EVs) connected to the grid increase the load of the grid, which may lead to the problems, such as overload, frequency violation and voltage violation. However, the EVs have potential for providing services for the grid, such as voltage regulation and frequency regulation. In this paper, we use the EVs to regulate the voltage of the smart grid and propose an algorithm...
This paper investigates the optimal procurement and scheduling of battery storage a in distribution system with high photovoltaic (PV) penetration. The battery under study is assumed to be owned by private entities with the objective of minimizing the electricity bill (or, interchangeably, maximizing the PV system yields). Voltage regulation is achieved by controlling the net metered real power at...
This paper introduces the domestic and foreign standards for interconnecting distributed resources with electric power systems, and compares the contents of power quality, response to abnormal conditions, power control, voltage regulation and the ability of fault ride-through in some typical standards. Some items in wind power generation and photovoltaic power generation standards are concretely introduced...
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