Abstract
To adapt to the growing scale of renewable energy and improve the consume ability of the power system, it is necessary to design a highly adaptable planning scheme for high penetration of the renewable energy integrated system. Thus, this paper firstly gives the conception of system adaptability and designs an adaptability index system, which considers the supply and demand balance, operation state, and network structure of the high penetrated renewable energy integrated system. It can help to comprehensively evaluate the system ability towards uncertain shocks. Then, a two-stage source-grid coordinative expansion planning model is presented. The adaptability indexes of supply and demand balance are used as objection of the source planning stage, the adaptability indexed of the operation state and network structure are used to guide the grid planning stage. The model is further solved based on the coordination between the source and grid planning stage. Finally, the case study verifies that the obtained optimal plan has good adaptability to the impact of renewable energy on the power supply capacity and security operation.
Highlights
As far as current research is concerned, the system adaptability to the renewable energy integrated system mainly focuses on the adaptability of existing power systems, which belongs to the category of post evaluation and rarely works on the relevant application of adaptability evaluation to the source and grid expansion planning of the power system [15]
To sum up, when PM up (t, τ) or PM down (t, τ) are greater than 0, it indicates that the system can maintain the balance of power supply and demand at this time; on the contrary, there is a lack of fast regulation in the system, which will lead to a certain degree of forced load shedding or curtailment of renewable energy [18]
If the supply and demand balance adaptability meet the threshold preset by the planner, the power supply does not need to be upgraded and directly entered into the second stage and the power system is adapted through the adaptable grid planning model planning and reconstruction to optimize the structure and operation state
Summary
The pursuit of a sustainable low-carbon society has made renewable energy, represented by wind power and photovoltaics, popularized and applied on a large scale. Variable renewable energy sources, such as solar photovoltaic and wind power, change the patterns of electricity utilization on the demand side, and bring challenges for the balancing and security of power supply on the source side [4]. Considering the scale effect, the uncertain characteristics of multi-spatiotemporal differential distribution of renewable energy are coupled in the operation features of the power system. The limitation of network structure and shortage of flexibility resources will further restrict the adaptability of the power system for renewable energy integration. A source-grid coordinative planning scheme adaptable for the high penetration system is crucial to improve the system adaptability to renewable energy [5]
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