Long-term generation expansion planning under uncertainties and fluctuations of multi-type renewables

This paper introduces a generation expansion planning model for a system integrated with multi-type renewables, specifically wind and PV, covering their joint uncertainty and fluctuation characteristics. Statistical Residual Load Duration Curve (S-RLDC) is proposed to deal with the uncertainty characteristic, in which the technique of convolution in separate time domain is adopted. Wavelet decomposition is applied to reveal the fluctuation amplitude of renewables, and further to determine the flexible capacity requirement for mitigating this fluctuation. As a case study, an actual district in the northwestern part of China is employed.