This module looks at two aspects of electrical power in the context of a wider energy system. The first aspect is electronic “switch-mode” circuits for conditioning and converting power such as in the grid interface for solar and wind energy systems. Circuits for various types of conversion between DC voltage levels and to/from AC will be analysed in order to support circuit design to meet a performance specification.

The second aspect covers the electromagnetic devices such as transformers, motors, generators and transmission lines of an AC power systems. The performance and efficiency of each type of electromagnetic device will be analysed. The link between these devices and how frequency and voltage of a power system are controlled will be illustrated.

The module will conclude with a discussion of the transition needed in power systems to achieve zero carbon dioxide emissions and the roles of power electronic, electromagnetic and information technologies have in that transition.

Upon successful completion of this module, you will be able to:
1. Demonstrate an appreciation of the factors which led to 50/60Hz alternating voltage, three-phase systems being almost universally adopted and identify exceptions,
2. Explain the factors that determine the energy yield of a photovoltaic solar energy plant.
3. Analyse the operation of DC to DC power converters
4. Determine suitable electrical component values and heatsinks for a given specification
5. Calculate current and power flow in single- and three-phase systems
6. Explain qualitatively how an induction machine can be used as a motor and a generator
7. Analyse the performance of an induction machine
8. Describe the features of distribution and transmission grids and how voltage is controlled within them.
9. Describe the challenges of operating a power system with close to 100% renewable energy.

1) Features of a traditional electricity supply system
2) Solar energy system and their expected energy yield
3) Switch-mode voltage conversion: basic principles, performance analysis and component choices for both step-up and step-down formats
4) Definitions of power for AC systems and the three-phase system
5) Induction machines: general features, principle of operation as motor and generator, equivalent circuit, power flow diagram, torque characteristic, direct-on-line starting, inverter operation.
6) Characteristics of transmission and distribution networks and analysis of power flow and voltage control.
7) Opportunities and challenges in the transition to a zero carbon-emission energy system.