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In order to solve a series of problems caused by photovoltaic (PV) off-grid, PV must have the low voltage ride through (LVRT) capability ensuring grid-connected operation and outputting reactive power to power grid within a certain time range. At present, the control strategies of PV grid-connected inverter under balance fault have been used effectively. However, the strategy of keeping the inverter...
Almost all existing relevant literatures are focused on the multi-inverter system that only contains one type of inverter. Till now, the interactions in multi-inverter system consisting of polytype inverters have been not investigated systematically. To fill this gap, the paper is aimed at the stability study of the generic system containing multiple types of inverters. The mathematic model of interactions...
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...
For the harmonic resonance problem of the photovoltaic multi-inverter parallel grid-connected system, this paper mainly analyzes the resonant characteristics of the LCL interface circuit. The model of the LCL interface circuit is given, and with the increase of grid-connected inverter number, the resonant characteristics are analyzed respectively which the circuit system is stimulated by the harmonic...
The presented paper evaluates measurement results and reports about further development from the vehicle to grid system presented in [1] and [12]. It uses a number of mass-production electric vehicles in sink and source mode to balance the load of an industrial plant by cutting off its peak loads. The actual load is detected and the balancing power is calculated by a predictive algorithm which keeps...
The existence of filters, series RLC and parallel RLC excite resonance in multi-parallel grid-connected inverters systems, which will lead to difficulties in solar energy applications. This paper proposed dual closed-loop with active damping control strategy to suppress resonance. The external current loop was controlled by PR (proportional-resonant) regulator and provide feedback on power grid current...
In the paper a simple stability-equivalent single- inverter system is proposed to analyze the stability of the complex multi-inverter system. Investigation shows that the harmonic resonance even instabilities will be triggered with the increase of the paralleled inverter quantities or the grid inductance due to the interaction between the inverter admittance and the grid admittance. From the perspective...
This paper presents a design approach for renewable energy power systems operation in case of power outage or grid failure. The grid connected distributed power system delivers energy to the consumers located on the micro-grid, operating at distribution voltage level, and also delivering the remaining surplus energy to the main distribution grid. The optimal and permanent system operation is when...
As decentralized renewable energy has been installed into the present grid, millions of consumers and prosumers interacting each other over power grid. The variety of needs for exchanging energy would arise based on each customers' situation. The future electricity grid should be a bi-directional system with interconnected using distributed energy management software. Being able to provide a secure...
In Jordan, electrical power demands trend is continuously increasing in the following decade. In 2030, the peak load is expected to achieve 7375 MW, which is 2.12 times higher than the power demands in 2016. Utilization of fuel local resources especially oil shale and renewable energy resources helps in securing the needs of the Jordanian power system to the generation capacity. Renewable energy is...
In this paper is presented the design of PR controller for 3-phase current source inverter. The converter is implemented with IGBT transistors and is modelled as a CSI (Current Source Inverter). Current control loops based on resonant techniques and instantaneous power p-q theory are used to control the DC/AC converter. This control strategy achieves active and reactive power generation in a three-phase...
This paper focuses on an analysis on compatibility between power grid quality voltage and dispatchable photovoltaic plant integration. In this order, based on a simulation, voltage dips have been calculated on the bus bars of a test system (IEEE-RTS). The method for voltage dip estimation used in this paper provides the frequency of voltage dips, due to symmetrical and unsymmetrical faults in the...
The objective of this paper is to provide a method for steady-state short-circuit analysis in power networks with distributed energy resources (DERs). For this purpose, we suggest an approach that takes into account the impact of current controlled DERs in the fault analysis. The current controlled DER has some characteristics that we should consider–1) DER's large filter inductance and 2) the limit...
This paper presents a single-stage three-level Neutral Point Clamped (NPC) inverter for connection to the electrical power grid, with integrated Maximum Power Point Tracking (MPPT) algorithm to extract the maximum power available from solar photovoltaic (PV) panels. This single-stage topology is more compact than the traditional topology, it was chosen because with the proper control strategy. It...
The problem of interfacing a Photovoltaic Generator (PVG) with an electrical three phase grid is addressed in the presence of nonlinear loads. The connection of the PVG to the power grid is done in two stages with both a DC/DC converter and DC/AC multilevel inverter. This latter is based on a Neutral Point Converter (NPC) operating simultaneously as an interfacing system and as a shunt active power...
In order to solve the distribution of voltage quality problems, this paper presents a new voltage regulation control strategy of distribution network based on switched affine model. By establishing the state space equation of the controllable series voltage regulation device, using the method of Lyapunov function and quadratic stability theory, according to the convex combination stability theory,...
Islanding detection is a distributed generation system is an important protective measure. Islanding detection is generally divided into two types, one is the active islanding detection, and the other is passive islanding detection. Islanding detection of power quality disturbance signal will always cause pollution; passive islanding detection has a long detection time and a large dead zone. Various...
The aim of this paper is the study and implementation of the start-up process of a shunt active compensators. This process is divided in two steps: the passive charging of the compensating capacitor accomplished by the inverse diodes of the compensator power inverter and the active charging of the capacitor, using the IGBTs. The second step can be implemented in many ways, with different ratios of...
Solar storms can affect the terrestrial power grid by inducing potential differences between points on the earth. These can couple into the power system through earthed structures such as transformer earths, which in turn can result in transformer saturation through geomagnetically induced current (GIC). For systems such as voltage-source converter (VSC) HVDC, this causes a variety of problems. This...
with high penetration of renewable energy in the distribution networks, two challenges are emerging. One is how power grid maintains power quality in condition that the target of investing renewable energy is to gain maximum financial returns. The other is how inverter proactively supports voltage and frequency to sustain network stability. To address this problem, by extending single price curve...
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