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Advantages such as environmental friendliness and flexibility have made microgrid an attractive option for in modern power systems. Microgrid is a localized grouping of distributed generators, storages and loads. Microgrid integrates with sustainable energy sources could reduce carbon emission. A microgrid can serve specific purposes, such as to enhance reliability, diversification of energy sources, and cost reduction. Therefore, microgrid has been introduced into building distributed networks as it makes both power generation and consumption more efficient. In Introduction Chapter 1 1 Chapter 1 Introduction Buildings are considered to be among the largest energy consumption unites in modern cities. With the increase of building energy consumption, the drawbacks of conventional building power distributed network topology arise progressively. The theme of this thesis is to design a novel building hybrid microgrid and its coordination control. Each subsystem in this novel building hybrid microgrid is designed to improve the whole system efficiency and meet specific requirements. The objectives and structure of this thesis are introduced in this chapter. 1.2.4 Simplify the hybrid energy storage controller Based on the building microgrid configuration, hybrid building energy storage system (HBES) has different operating modes. Energy storage converters are able to work in either voltage regulation mode or power exchange mode. The proposed adaptive area droop control is introduced to HBES which could automatically alter the energy storage operating mode by changing the droop coefficient. The energy storage converter does not need multiple controllers to achieve different objectives. This also means that the energy storage converter is simplified. 1.2.5 Extend the DC output voltage range A highly efficient single-phase PFC converter features sinusoidal input current, three-level output characteristic and flexible output DC voltage. Its attractiveness is that the embedded bidirectional DC/DC buck converter only needs to process partial input power rather than full scale of input power, and therefore energy conversion efficiency can be largely improved compared with the conventional two stage solution. Also, the PFC stage exhibits three-levels of output voltage, and the An added benefit of this converter is that, the fluctuating 100Hz or 120Hz harmonic power in the single-phase system can be diverted into the dc-link capacitor through proper control design, and the terminal voltage and/or the charging current of battery pack will be fairly constant, which may expand its working lifetime. Its operation principle and control strategies are discussed in detail in this paper, and both simulations and experimental results are provided for validation. Chapter 7 concludes the research findings presented in this thesis and suggests some prospective research topics for future investigation.

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