Abstract
In the coming decades, the proportion of wind–solar energy in power system significantly increases, resulting to uncertainties of power fluctuation in abundant wind–solar energy regions. The flexibility operation of Pumped Storage Power Plants (PSPPs) has already been widely recognized to regulate wind–solar power fluctuations; however, less is known about the regulation reliability of the PSPP affected by them. It is a challenge, since various uncertainties exist during this regulation process. Here, a mathematical model with a solar–wind–hydro hybrid power generation system is adopted to investigate the regulation reliability of PSPP. The uncertainties and limitations of model parameters are considered during this process. Five regulation indexes, i.e., rise time, settling time, peak value, peak time and overshoot of the reactive power generator terminal voltage, guide vane opening and angular velocity, are extracted to evaluate the PSSP’s regulation quality. Finally, the PSPP reliability probability affected by parametric uncertainties is presented. The obtained results show that the inertia coefficient is the most sensitivity parameters for the settling time, peak value and peak time with sensitivity index 33.7%, 72.55% and 71.59%, respectively. The corresponding total contribution rate of the top 10 sensitive parameters are 74.45%, 93.45% and 87.15%, respectively. Despite some types of uncertainties not being considered, the results of this research are important for the regulation reliability evaluation of PSPPs in suppressing power fluctuations of wind and solar generation.
Highlights
In the hybrid power system model, two fault points, i.e., H and S, are set up at the output terminal of Pumped Storage Power Plants (PSPPs) and infinite power supply to simulate the situation of the three−phase short circuit fault (TPSCF)
Parameters of Wind Power Generation System (WPGS) and Photovoltaic Power Generation System (PPGS) have a significant influence on Dynamic Performance Indexes (DPIs), indicating that these parameters have the ability to indirectly affect the angular velocity of PSPP by interacting with other parameters
Parameters of the wind, solar and hydro subsystem show the different influence on DPIs of the PSPP output due to parameters uncertainty
Summary
These uncertainties bring a great burden on peak shaving and frequency modulation, posing a challenge for regulation reliability of PSPPs in suppressing power fluctuations of wind and solar generation. Studies of this challenge have been divided into three research directions, namely, complementary uncertainty, regulation performance, and reliability. As for complementarity uncertainty, Han et al, proposed a complementarity evaluation method for the WSH system by thoroughly examining the fluctuation of the independent and combined power generation, and the results showed that the best complementarity level is obtained by changing the proportion of wind and photovoltaic power [6]. Related studies on the regulation reliability of a PSPP in a wind−solar hybrid power generation system are scarce.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call