Abstract
PV hosting capacity (PVHC) analysis on a distribution system is an attractive technique that emerged in recent years for dealing with the planning tasks on high-penetration PV integration. PVHC uses various system performance indices as judgements to find an available amount of PV installation capacity that can be accommodated on existing distribution system infrastructure without causing any violation. Generally, approaches for PVHC assessments are implemented by iterative power flow calculations with stochastic PV deployments so as to observe the operation impacts for PV installation on distribution systems. Determination of the stochastic PV deployments in most of traditional PVHC analysis methods is automatically carried out by the program that is using random selection. However, a repetitive problem that exists in these traditional methods on the selection of the same PV deployment for a calculation was not previously investigated or discussed; further, underestimation of PVHC results may occur. To assess PVHC more effectively, this paper proposes an improved stochastic analysis method that introduces an innovative idea of using repetitiveness check mechanism to overcome the shortcomings of the traditional methods. The proposed mechanism firstly obtains all PV deployment combinations for the determination of all possible PV installation locations. A quick-sorting algorithm is then used to remove repetitive PV deployments that are randomly selected during the solution procedure. Finally, MATLAB and OpenDSS co-simulations implemented on a small distribution feeder are used to validate the performance of the proposed method; in addition, PVHC enhancement by PV inverter control is investigated and simulated in this paper as well. Results show that the proposed method is more effective than traditional methods in PVHC assessments.
Highlights
In recent years, the integration of renewable energy (RE) into the power system has grown significantly due to the price fall of PV products and continued support of national green energy policies
For the stochastic-based methods, this study finds a problem of repetitive PV deployment, which may be met in the random selection mechanisms during the calculation procedure, using the methods given in above-mentioned works
A common problem among various studies using General Stochastic Analysis Method (GSAM) described in the Introduction can be found in step 3 of Figure 2, where only a random manner is used to produce a new PV installation location and without considering any mechanism to avoid the repetitive selection of the PV installation location
Summary
Yu-Jen Liu 1, *, Yu-Hsuan Tai 2 , Yih-Der Lee 3 , Jheng-Lung Jiang 3 and Chen-Wei Lin 2.
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