Dynamic voltage stability of distribution system with a high penetration of rooftop PV units

Yaghoobi, Jalil; Mithulananthan, Nadarajah; Saha, Tapan Kumar

doi:10.1109/pesgm.2015.7286608

Cited by 21 publications

(24 citation statements)

References 10 publications

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“…In general, single-phase IM loads having low inertia such as air-conditioner compressor represent approximately 60-70 percent of peak load during hot weather in a residential grid [9]. An IM load draws 3-5 times of its rated current during stall that could prevent voltage recovery and may lead to rapid voltage collapse [3,10,11]. Another cause of STVI of highly PV-penetrated DN could be the dynamic behaviors of the PV systems itself [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have been conducted to examine the impact of IM loads on the STVS [6,7,14], as well as to explore the application of FACTS devices to improve the STVS [3,16,17]. In contrast, the impacts of dynamic behaviors of PV systems on the STVS have been discussed in very few researches [10,12]. Voltage stability for residential customers due to high PV penetration has been investigated in [9].…”

Section: Introductionmentioning

confidence: 99%

“…Battery storage and PV reactive power support have been focused as potential solutions in [9]. In [10], the impact of sudden loss of PV power on the STVS is investigated for different scenarios of bus voltages. It has been concluded that STVI can occur in a slightly lower-voltage profile system [10].…”

Section: Introductionmentioning

confidence: 99%

“…In [10], the impact of sudden loss of PV power on the STVS is investigated for different scenarios of bus voltages. It has been concluded that STVI can occur in a slightly lower-voltage profile system [10]. However, the impacts of LVRT and DVS have not been taken into account in both of the research presented in [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…It has been concluded that STVI can occur in a slightly lower-voltage profile system [10]. However, the impacts of LVRT and DVS have not been taken into account in both of the research presented in [9,10]. The effects of LVRT capability by PV-inverters have been examined in [12].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Voltage Support by TL-PV Systems to Mitigate Short-Term Voltage Instability in Residential DN

Islam

Mithulananthan

Hossain

2018

IEEE Trans. Power Syst.

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Recently, transformerless (TL) inverters are being extensively used in small-scale photovoltaic (PV) systems due to their compact-size, lighter-weight, lower-cost and higherefficiency compared to their counterpart with transformer. However, the growing penetration of these small-scale based PV systems and low-inertia induction motor (IM) loads in lowvoltage distribution networks (DNs) make the grid more vulnerable to short-term voltage stability (STVS). Hence, this paper thoroughly examines the STVS of DN with highpenetration of TL-PV units, and provides countermeasures by TL-PV systems to mitigate any short-term voltage instability (STVI). The detailed dynamic model of the TL inverter is developed first. Next, three control strategies: (1) constant peak current (CPC), (2) constant active current (CAC), and (3) constant active power (CAP) with low voltage ride through (LVRT) and dynamic voltage support (DVS) capabilities are proposed to improve STVS. The impacts of different level of PV penetrations and LVRT capability of TL-PV inverters on the STVS are explored. Moreover, countermeasures such as LVRT with CAC and CAP controls and DVS by the TL-PV systems are designed and implemented. Several case studies are carried out on an IEEE 4 bus system first, and later extended to IEEE 13 node test feeder. The results show that DVS can further improve STVS in residential DNs. In addition, CAP and CAC control strategies can speed-up the post-disturbance voltage recovery compared with the conventional CPC control. Index Terms-Dynamic voltage support, fault induced delayed voltage recovery, low voltage ride-through, short-term voltage stability, transformerless inverter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamic Voltage Support by TL-PV Systems to Mitigate Short-Term Voltage Instability in Residential DN

Islam

Mithulananthan

Hossain

2018

IEEE Trans. Power Syst.

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Dynamic voltage stability of unbalanced DNs with high penetration of roof‐top PV units

Islam

Mithulananthan

Hossain

2020

Int Trans Electr Energ Syst

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Dynamic voltage instability (DVI) issue is one of the primary concerns in distribution networks (DNs) due to the growing integration of low-inertia compressor motor loads. Moreover, the inherent unbalanced nature of DNs as a result of unbalanced load could make the DVI issues more severe. Furthermore, with the way rooftop photo-voltaic (PV) units are integrated, often in the form of singlephase units, DVI issues might be a threat to secure operation of DNs (both low and medium voltage) in the future. Though dynamic voltage stability (DVS) has been researched well in DNs, how imbalance system would influence the phenomena yet to be fully understood, especially with growing number of PV units. Although the roof-top PV units are connected at low-voltage DNs, their impacts on the DVS can propagate to the immediate medium-voltage DNs. Hence, this paper systematically examines the impacts of imbalance on the DVS of medium-voltage DNs with high PV penetrations first. The degree of unbalance is defined, and then DVS is thoroughly investigated considering various unbalance scenarios. Two indices, namely Voltage Nadir (VN) and Rate of Change of Voltage Recovery (ROCOVR) are proposed for clear understanding of the issue. It is observed that the increment of system imbalance can significantly influence the DVS in a deprived way. Finally, this paper has discussed and compared mitigation strategies with respect to cost and DVS improvement. Case studies are conducted on two IEEE benchmark test systems, namely, IEEE 4 bus and IEEE 15 bus systems. It is revealed that reactive power injection by rooftop PV

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Optimal design and analysis of a grid‐connected hybrid renewable energy system using HOMER Pro: A case study of Tumbatu Island, Zanzibar

Said,

Kichonge,

Kivevele

2024

Energy Science & Engineering

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This study addresses the pressing issue of quality electricity access in remote regions, with a specific focus on Tumbatu Island in Tanzania. Most studies on quality improvement concentrate on low‐voltage distribution lines and leave high‐voltage (HV) transmission lines behind. It is essential to address quality issues in HV lines due to their critical role in electricity transmission and distribution infrastructure. The objective of the study is to improve the voltage profile on the island's HV transmission line by identifying the optimal hybrid energy system comprising solar PV, wind turbine, and battery technologies. The study begins by presenting the total power demand and consumption on Tumbatu Island, which are important factors in designing an efficient energy system. The findings reveal a power demand of 7173 kW and a consumption of 28540 kWh/day, with an average scaled value of 1507.9 and 6000 kWh/day. To achieve the desired voltage profile improvement, the research incorporates HOMER Pro software for simulating and analyzing various hybrid system configurations. Essential input parameters, such as costs, resources, technology components, and load, are considered in the simulation process. The software generates a ranked list of options based on the system's net present cost (NPC). The simulation results demonstrate that the integration of solar PV, wind turbine, and HV lines provides a substantial improvement in the voltage profile, increasing it from 29.6 to 31.23 kV during peak demand periods. This solution proves to be the most economically viable, with the lowest NPC of $4,003,851 and a relatively short payback period of 3.79 years. In addition, a sensitivity analysis is performed to identify the most influential parameter in the system's performance. Wind speed is found to have the greatest impact, emphasizing its significance in the design and operation of the hybrid energy system. The implementation of this optimal hybrid renewable energy system on Tumbatu Island will not only improve the voltage profile and meet the island's energy needs but also shall contribute to global efforts in reducing pollution and the cost of electricity to the Tumbatu Island population. Moreover, it addresses the current and future demands for clean energy, underlining its importance in achieving sustainable and accessible electricity in sub‐Saharan Africa and beyond.

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Dynamic voltage stability of distribution system with a high penetration of rooftop PV units

Cited by 21 publications

References 10 publications

Dynamic Voltage Support by TL-PV Systems to Mitigate Short-Term Voltage Instability in Residential DN

Dynamic Voltage Support by TL-PV Systems to Mitigate Short-Term Voltage Instability in Residential DN

Dynamic voltage stability of unbalanced DNs with high penetration of roof‐top PV units

Optimal design and analysis of a grid‐connected hybrid renewable energy system using HOMER Pro: A case study of Tumbatu Island, Zanzibar

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