Voltage control of unbalanced three-phase networks using reactive power capability of distributed single-phase PV generators

Summary This study presents an innovative and optimized reactive power support (ORPS) strategy for photovoltaic (PV) inverters to improve the dynamic voltage stability (DVS) of islanded microgrid (MG) with induction motor (IM) load. On the occurrence of the fault, voltage instability (VI) happens due to the low‐inertia IM load and poor ride through capability of PV inverters of MG. Supplement of optimal RPS promptly, without exceeding the rated current value of the inverter, is aimed at the proposed control, to maintain DVS during severe voltage downfall as a result of a fault. Once the profiled voltage value is restored and the necessity of RPS is fulfilled, the PV inverter returns to its prefault power production combination. The detailed model of an inverter‐based islanded MG with IM load is built to examine the DVS, and the theoretical analysis and technical discussion are conducted. A comparison between the conventional and proposed strategies is carried out. From the demonstrated results, employing the proposed ORPS control can provide RPS effectively and helps to improve the DVS. This proposed strategy can also provide an equivalent service as an expensive 610‐kVA dynamic volt‐ampere reactive support device (ie, D‐STATCOM) in the studied MG.

Section: Introductionmentioning

confidence: 99%

Optimized reactive power support strategy for photovoltaic inverter to intensify the dynamic voltage stability of islanded microgrid

Afrin

Yang

2020

“…DG placement problem was studied in Gkaidatzis et al considering load variation using PSO algorithm. Voltage control of unbalanced distribution system with PV‐based DGs was presented in Eid and Abdel Akher . Bus voltage was controlled under load variations by controlling the reactive power capability of PV inverters.…”

Section: Introductionmentioning

confidence: 99%

Optimal coordinate control of OLTC, DG, D-STATCOM, and reconfiguration in distribution system for voltage control and loss minimization

Murty

Sharma

2018

Summary This paper presents optimal coordination and management of on‐load tap changer (OLTC), distribution static compensator (D‐STATCOM), distribution generation (DG), and reconfiguration to maximize annual cost savings and improve voltage profile using hybrid optimization. An analytical approach is developed to find optimal setting of OLTC. Optimal reconfiguration of the network is derived using genetic algorithm. Optimal location of DG and D‐STATCOM is determined using gravitational search algorithm, and optimal ratings are obtained using interface with MATLAB and GAMS environment. Fourteen realistic case studies are investigated in this paper work. In the first scenario, regulating devices are disabled to monitor the voltage profile and energy loss of the test system. In the remaining cases, influence of OLTC, DG, D‐STATCOM, and reconfiguration is independently and simultaneously studied. In the last scenario, OLTC, DG, D‐STATCOM, and reconfiguration are enabled to maintain voltage security and minimize power losses. Simulation results are obtained for IEEE 69‐bus test system and compared with other existing methods available in the literature. The proposed technique is reliable and efficient to obtain global optimal solution. Simulation results clearly indicate that optimal coordination and management among OLTC, DG, D‐STATCOM, and reconfiguration is required to maximize annual cost savings and maintain voltage at each node as per statutory requirements. Moreover, the analysis has been carried out for time‐varying distribution system with realistic load model.

“…In modern power system grid, renewable energy sources (RES) are giving attractive solutions for the future and further technology advancement is in process to enhance energy generation. [1][2][3][4][5][6] The RES have possibility to play an important role in the modern smart grid technology. The contribution and share of their RES in energy production has significantly increased in the last decade.…”

Section: Introductionmentioning

confidence: 99%

Stochastic evaluation of voltage sag in power system network considering effect of photovoltaic generation

Khatri¹,

Kumar

Bansal

et al. 2018

Summary The present scenario need is to integrate renewable energy sources (RESs) with power grid to address the increasing concerns of environmental issues and energy demand. Apart from renewable energy integration, the quality of power delivered is also important. Among all power quality issues, the most common power quality issue is voltage sag which significantly affects industrial, commercial, and domestic users. This paper estimates the frequency of voltage sag using analytical method. This paper also analyses the change in frequency of occurrence of voltage sag when power system network is integrated with photovoltaic system. This stochastic evaluation of voltage sag is performed for 30‐bus IEEE subtransmission system. The voltage sags are evaluated at various observation buses with and without integration of photovoltaic generation. The numbers of photovoltaic generating plant are increased in order to observe variation in frequency of occurrence of voltage sag. The results are presented in terms of frequency of occurrence of voltage sag and area of vulnerability for transmission network.