Impact of large scale photovoltaic system on static voltage stability in sub-transmission network

Kabir, Shahariar; Mithulananthan, Nadarajah; Bansal, R.C.

doi:10.1109/ecce-asia.2013.6579138

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…At this moment, the load will not be shed according to the traditional UVLS strategy and the voltage collapse will occur in the system once the load creates a fluctuation. According to Equation (15), the minimum load-shedding quantity ∆Q 1Min.mls = (0.15 − 0.1) × 9.8310 = 0.49 pu and the range of the load-shedding quantity is (1-3) ∆Q 1Min.mls . As LS is relatively larger, the load-shedding quantity takes 1.47 pu (3 × 0.49).…”

Section: Discussion On the Load-shedding Quantitymentioning

confidence: 99%

Fuzzy Load-Shedding Strategy Considering Photovoltaic Output Fluctuation Characteristics and Static Voltage Stability

Wei

2018

Energies

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Based on the equilibrium point equations of a classic three-node system integrated with a large-scale photovoltaic cell (PV) power plant, the impact of PV output fluctuation on the saddle-node bifurcation (SNB) was derived and analyzed. When PV runs in a unity power factor and the PV output active power P pv is not too large (several hundred MW and below), the PV output fluctuation has little effect on the SNB point position and load margin index, so that the load margin index can be calculated online using the SNB point at P pv = 0 pu. On the other hand, the local reactive power compensation in the load center can effectively raise the load bus voltage and make the voltage stability problem become more concealed; the traditional under-voltage load-shedding (UVLS) strategy only carries out load shedding when the bus voltage amplitude is below the specified value and cannot effectively maintain the system static voltage stability in some occasions. In this paper, a fuzzy load-shedding strategy considering the impact of PV output fluctuations for the large-scale PV grid-connected system was designed, taking the load bus voltage amplitude and load margin index as fuzzy input variables, and the load-shedding command as a fuzzy output variable. Nine fuzzy IF-THEN rules were extracted for the fuzzy controller and the corresponding practical calculation method of load-shedding quantity was put forward. The simulation results of the classic three-node system and IEEE 14-bus system, both with a 100 MW PV power plant, verified the effectiveness of the fuzzy load-shedding controller whose input variable load margin index was calculated using the SNB point when the PV active power output was 0. The designed fuzzy load-shedding strategy can compensate for the defect-that the traditional UVLS strategy cannot effectively guarantee the system static voltage stability-and it can be widely used in power grids integrated with PV power plants whose scales are at a level of several hundred MW and below.

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Section: Discussion On the Load-shedding Quantitymentioning

confidence: 99%

Fuzzy Load-Shedding Strategy Considering Photovoltaic Output Fluctuation Characteristics and Static Voltage Stability

Wei

2018

Energies

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“…[19][20][21][22] In this study, three factors were analyzed. As said earlier, lack and inadequate reactive power compensation result in voltage instability in the power system.…”

Section: Voltage Stabilitymentioning

confidence: 99%

Assessment of Malaysia's Large‐Scale Solar Projects: Power System Analysis for Solar PV Grid Integration

Khan

2019

Global Challenges

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carried out via stand-alone system or grid connected via large-scale solar (LSS) PV. LSS PV is a centralized system consisting of PV arrays with a power system network packed with various types of electronic equipment for grid integration. This study focuses on several design parameters that are expected to exhibit significant effect to the performance parameters of the power grid in large-scale centralized grid-connected PV system. [3] Solar photovoltaic energy harvesting is dependent on the photovoltaic effect and physical phenomenon. During daytime, this clean energy is largely available with varying peak sun hour depending on its geographical locations. Studies on the generations profile and its load profiles can greatly reduce the dependence of conventional energy sources in the energy mix. [4] The intermittency, generation-load profiles, and stability issues presented a new challenge in large-scale solar PV integration with the power grid system. This paper will discuss the relevant technical concerns and impact of large-scale PV systems integration on power grid system in the literature review and propose a solution in the research methodology section. Novelty of the WorkThis paper carried out a pilot study on LSS to power integration using real LSS data in Malaysia and taking industry grade solar PV with local contextualization, national grid code in sizing, and design considerations. This paper investigated the current transmission network overloading issue due to the LSS PV penetration into the existing national power grid in Malaysia. The challenge involves the selection of appropriate bus system for analysis and its impact to potential difference variation at each bus. In order to achieve stability in the power system network, this paper also looks into the most significant parameters that greatly affect the potential difference stability and hence proposed a feasible mitigating solution. Thus, an optimized configuration for the integration of LSS PV to the bus of the transmission network for the Malaysia context will form the novelty of this paper.Malaysia targets to become the second-largest producer of solar photovoltaic (PV) in the world by increasing the current output from 12% to 20% in 2020. The government also expects to achieve 45% reduction of greenhouse gas emission by 2030 through renewable energy mainly by solar PV. Large-scale solar (LSS) aims to produce 2.5 GW, which contributes to 10% of the nation's electricity demands. The LSS system is held back by the grid-scale integration, transmission, and distribution infrastructure. Thus, power system analysis is crucial to achieve optimization in LSS to power grid integration. This paper investigates various power system analysis models and recommends an optimized configuration based on Malaysia's LSS scenario. In stage 1, an optimal PV sizing is carried out based on real data of LSS installation in different locations. In stage 2, power analysis is carried out using to analyze the potential difference variation when connected to a nine-bus p...

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“…Static analyses have been done by authors in [11] while considering the following analysis methods: (1) singular value decomposition (SVD) and (2) modal analysis. To highlight the necessity of performing dynamic voltage stability analysis while integrating PV, the loading level of the considered IEEE sub-transmission network with PQ loads is increased to 505.98 MW and 157.86 MVAR.…”

Section: Importance Of Dynamic Stability Analysismentioning

confidence: 99%

Dynamic voltage stability analysis of sub-transmission networks with large-scale photovoltaic systems

Kabir

Krause

Bansal

et al. 2014

2014 IEEE PES General Meeting | Conference &Amp; Exposition

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Due to the increased concern of global warming, solar energy based Photovoltaic (PV) generation schemes are gradually becoming more popular as an alternative renewable energy source. As PV units may be located closer to load centers than traditional power plants, they can aid in improving the reliability of the network. Despite these environmental and technical benefits, the dynamic voltage behavior of a power system under the influence of large-scale PV units needs to be investigated for potential upgrade of existing standards. This research paper presents analyses of the impact of large-scale PV on dynamic voltage stability with respect to short and long term state variables for IEEE 14 bus system. Preliminary findings suggest that the influence of large-scale PV depends on PV controller type and setting. It is also noted that the integration of large-scale PV has implications on dynamic behavior which are not adequately captured by static analysis alone. Index Terms--contingency; photovoltaic (PV); short and long term state variables; static and dynamic loads; voltage stabilityI.

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Impact of large scale photovoltaic system on static voltage stability in sub-transmission network

Cited by 13 publications

References 9 publications

Fuzzy Load-Shedding Strategy Considering Photovoltaic Output Fluctuation Characteristics and Static Voltage Stability

Fuzzy Load-Shedding Strategy Considering Photovoltaic Output Fluctuation Characteristics and Static Voltage Stability

Assessment of Malaysia's Large‐Scale Solar Projects: Power System Analysis for Solar PV Grid Integration

Dynamic voltage stability analysis of sub-transmission networks with large-scale photovoltaic systems

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