The numerical modelling of a phase change material (PCM) attached to a hybrid three-dimensional truncated compound parabolic concentrator and thermoelectric module is performed under transient and non-uniform variation in solar radiation. To demonstrate the higher performance of the system, the performance parameters of a stand-alone system (without PCM), SAS, and incorporated system (with PCM), IS, are modelled and studied using the ANSYS 2020 R1 software and MATLAB R2020a Simulink software. The PCM is placed at the hot junction of the solar thermoelectric generator (STEG) in order to act as a re-concentrating lens via the phase-change lensing effect and to decrease the adverse effect of transient and non-uniform solar radiation on the STEG. The results demonstrate an increase in the light transmissivity and refractive index of the PCM after melting and the efficacy of the PCM in shielding the STEG under extremely concentrated solar radiation intensities. The optimum heat input required to maximise the STEG efficiency and power output while minimising the challenge of excess heat dissipation in STEG systems is obtained and discussed. Finally, the results obtained show that the maximum temperature gradient, power output and efficiency from the stand-alone were higher than those from the incorporated system. The results obtained from this study will provide useful information in the design of STEGs under fluctuating meteorological conditions coupled with solar concentrators, which generate varying solar radiation.

在太阳辐射的瞬态和非均匀变化下，对附着到混合三维截断复合抛物面聚光器和热电模块的相变材料（PCM）进行了数值建模。为了演示系统的更高性能，使用ANSYS 2020 R1软件和MATLAB R2020a Simulink软件对独立系统（不带PCM），SAS和集成系统（带PCM），IS的性能参数进行了建模和研究。 。PCM放置在太阳能热电发生器（STEG）的热接点处，以便通过相变透镜效应充当再聚光透镜，并减少瞬态和非均匀太阳辐射对STEG的不利影响。结果表明，融化后PCM的透光率和折射率增加，并且在极度集中的太阳辐射强度下PCM屏蔽STEG的功效提高。获得并讨论了最大化STEG效率和功率输出同时最小化STEG系统中过度散热的挑战所需的最佳热量输入。最后，获得的结果表明，独立系统的最大温度梯度，功率输出和效率均高于集成系统的最大温度梯度，功率输出和效率。这项研究获得的结果将为气象条件变化的气象条件下，结合产生太阳能辐射变化的太阳能聚光器，为STEG的设计提供有用的信息。