Eee projects on geothermal thermoelectric power generation — Simulation & Power Modeling

Abstract — Eee projects on geothermal thermoelectric power generation

experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Geothermal power generation employing Organic Rankine Cycle (ORC) technology is a widely acknowledged and conventional approach for harnessing geothermal energy. In an innovative advancement, we propose a novel design integrating downhole thermoelectric power generation with a coaxial borehole heat exchanger. This design aims to enhance the efficiency and sustainability of geothermal energy utilization. In this innovative design, the geothermal well is divided into two distinct sections: a power generation section and a heat exchanging section, achieved through the implementation of a packer positioned from the uppermost part of the targeted zone. The process involves the injection of cold fluid downhole via an insulated pipe. Subsequently, a portion of the injected fluid is directed to flow in reverse within the casing-tubing annulus above the packer, while another portion circulates into the casing-tubing annulus below the packer before ascending through the tubing. This dual flow mechanism establishes distinct cold and hot sources for the thermoelectric generator, a key feature facilitated by this innovative design. Analytical models detailing of downhole temperature distribution for thermoelectric power have been meticulously developed. A comprehensive case study, focusing on a geothermal well with 3000 m length of power generation section and 500 m heat exchanging section, has been conducted. The results indicate that a significant generating capacity could be achieved with a higher wellhead temperature, and the payback period under different carbon tax scenarios is about 6–8 year. Furthermore, the effects of injection rate, fluid diversion ratio, and casing-tubing configuration on power performance and thermal-electricity efficiency are also discussed. This method not only enables the concurrent harvesting of geothermal energy and power generation but also operates consistently throughout the year. The results thus emphasize the viability and economic feasibility of the proposed approach.

Analytical & State-Space Control Methodology

Recently, environmental pollution and extreme climate events have happened frequently. Developing and utilizing geothermal energy is put forward as urgent work and becomes one of the most important measures to solve livelihood issues. Geothermal energy is a clean, renewable, and sustainable energy source. It is estimated that the Earth’s total heat flux is about 44.2 ± 1.0 TW 1 . Geothermal energy will undoubtedly become an important part of new energy in the future.

Simulink Waveforms & Power Quality Findings

Figure 1: Power Converter Circuit Schematic & Electrical Interfacing for Eee Projects On Geothermal Thermoelectric Power Generation Recently, geothermal power generation has developed rapidly. According to the statistics, the total installed geothermal power generation capacity in 2015 was 12,647 MWe. The annual electrical generation in 2019 was 92 TWh, approximately 1.0% of global electricity generation 2 . Nevertheless, the world's target by 2050 is to reach 1180 TWh of annual electricity generation from geothermal sources, which is about 2.5–3.1% of global electric demand 3 .

Scope & Practical Applications

• High-efficiency DC-DC converters and isolated resonant topologies (LLC / DAB)
• Sinusoidal and Space Vector PWM inverters for grid integration & industrial motor drives
• MOSFET / IGBT gate driver optimization with active Miller-clamp shoot-through protection
• Power quality conditioning with Total Harmonic Distortion (THD) strictly compliant with IEEE 519
• Complete Simscape .SLX model files, parameter calculation scripts, and IEEE dissertation reports