Long Duration Flexibility Planning Challenges and Solutions for Power System With Ultra High Share of Renewable Energy

Abstract

The uncertainty of wind/photovoltaics (PV) power generation and load fluctuations highlight the urgent need for flexible yet stable power resources. With the increasing in the share of renewable energy, the fluctuation presents a trend toward the longer periods, larger amplitudes, and more drastic changes. Therefore, research on the long duration flexible resource planning for the scenarios of the ultra high share of renewable power system (UHRPS) has become the focus. In this work, the main structural and operating characteristics of UHRPS are introduced and analyzed, which is followed by the flexibility requirements and flexibility planning challenges of UHRPS scenarios. Then, the current research trends in flexibility planning schemes of renewable energy power systems are reviewed. Finally, the key problems and solutions for research on the long duration flexibility resource planning of UHRPS are proposed.

Decarbonizing energy islands with flexibility-enabling planning: The case of Santiago, Cape Verde

“…Then, only existing units are allowed to be online with (37). Lastly, the capacity sizing of ESS is defined in (38).…”

“…Particularly, hydro usually presents limitations regarding the amount of energy that can be produced over a given period. This limitation is usually related to regulations or strategies regarding the reservoir water level [38].…”

“…Then, other types of storage like thermal can be considered as demand responsive units or power-to-X (P2X) applications covered in the next section. Note that traditionally, ESS operation targeted load smoothing applications; however, in modern grids they are expected to provide further benefits such as ancillary service provision to enhance reliability [38].…”

Decarbonization Analysis for Thermal Generation and Regionally Integrated Large-Scale Renewables Based on Minutely Optimal Dispatch with a Kentucky Case Study

“…Furthermore, it was found that temporal aggregation or time slices, deployed in many previous studies, may not capture fundamental relationships, understate the value of broad technology portfolios, and do not solve time-based mismatch issues [18]. These studies, as well as others reported in [16,19,20], discussed chronological simulation as necessary to capture the challenges of long-term energy deficits due to seasonal variability.…”

Multi‐timescale synergistic planning for flexible regulation of thermal power to support wind‐photovoltaic‐storage

“…In order to achieve the green and low-carbon transformation of China's power system, it is necessary to build the structural form and balancing mechanism of the new power system by building energy storage devices and transforming thermal power with flexibility starting from the planning stage [3][4][5][6]. The contradiction between the gradual increase in the flexibility demand of the new type of power sys-tem and the gradual decrease in the flexibility resources can be solved by reasonably optimizing the allocation of power supply and the installed proportion of thermal power and energy storage resources [7][8][9], and the planning concept will be shifted from the traditional balance of power to the balance of supply and demand of flexibility [10], which minimizes the planning cost and improves the capacity of new energy consumption from the economic point of view [11,12]. Reference [13] proposed a power supply expansion planning model considering unit commitment constraints for the problem of power system flexibility demand, optimizing investment decisions for variable renewable energy, energy storage systems and thermal power, and providing real-time flexibility using energy storage.…”