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Thyristor-Controlled Series Capacitor (TCSC) is considered as solutions to the fast increasing demand in modern power systems. The TCSC project located at Hutton substation in the Great Britain (GB) power system is used to reinforce the existing transmission line to meet the 2020 target by introducing more renewable energy into the network. It is also able to provide system stability improvement and Sub-Synchronous Resonance (SSR) mitigation with its flexbile operational princinples. SSR problems in power systems are caused by the interaction between the mechanical turbine shaft system and the electrical system resonance. The capability of TCSC in SSR mitigation in High Voltage Alternative Current (HVAC) systems is investigated. The study is conducted in two aspects, the inherent capability of TCSC to mitigate SSR and the active control scheme of TCSC for SSR damping. The operational principle of TCSC and the dynamic performance of TCSC under SSR impacts are analysed. It is found that the regulation of thyristors allows TCSC to transform sub-synchronous components into fundamental components. This ability of TCSC contributes to an improvement in SSR damping. A Sub-Synchronous Damping Controller (SSDC) for TCSC is to secure the mitigation of SSR. But conventional SSDC has its limitations and challenges in implementation. These limitations include communication delays due to remote information transmitting at the generator side and the poor performance of bandpass filters due to its variable frequency response. A new SSDC scheme is proposed to solve the limitations and to improve the performance of SSR damping. A physical TCSC device is designed and implemented at the laboratory scale. By interconnecting with Real-Time Digital Simulation (RTDS) and Power Amplifier (PA), III a TCSC platform is set up to perform experimental tests. The effectiveness of the proposed SSDC scheme is validated with both simulation software on PSCAD/EMTDC and the TCSC platform. The simulation results agree with the experimental test results. The developed TCSC platform can be utilised for testing other control schemes for SSR mitigations.

Insurance fraud is perhaps one of the most pressing problems challenging the insurance industry. The judiciary plays a significant role in tackling insurance fraud: the burden is on their shoulders to identify the appropriate legal rules governing fraudulent claims and determining the consequences of fraud. However, regrettably, this process has long remained elusive and in the recent decades the courts have tried but failed to formulate clear principles for the treatment of insurance fraud, so the process is, still, continuing. This judicial process is not free from difficulty particularly with regard to the consequence of presenting fraudulent claims. The failure of judicial attempt to formulate clear principles in this jurisdiction has attracted the attention of the Law Commissions which intend to pursue a reform at the legislative level. At the current stage, the law seems to stand at a turning point and try to adapt itself to the new situation. The author is of the opinion that this is the right time to provide a full-scale research in the jurisdiction of insurance fraudulent claims for the purpose of identifying the existing difficulties and confusions, shaping the appropriate legal regime and contributing to the evolving reform process of English insurance contract law. The author is also of the opinion that considering the viability of reform proposals from a novel perspective, namely economics and law, might add a very interesting dimension to the debate. It is believed that the law and economics debate would be helpful in explaining the outcomes of certain legal solutions and identifying the most appropriate legal remedy. Finally, the author also intends to examine to what extent the Law Commissions' proposal could be defended in the light of author's legal and economic analysis.