Analyses of power system vulnerability and total transfer capability

Modern power systems are now stepping into the post-restructuring era, in which utility industries as well as ISOs (Independent System Operators) are involved. Attention needs to be paid to the reliability study of power systems by both the utility companies and the ISOs. An uninterrupted and high quality power is required for the sustainable development of a technological society. Power system blackouts generally result from cascading outages. Protection system hidden failures remain dormant when everything is normal and are exposed as a result of other system disturbances. This dissertation provides new methods for power system vulnerability analysis including protection failures. Both adequacy and security aspects are included. The power system vulnerability analysis covers the following issues: 1) Protection system failure analysis and modeling based on protection failure features; 2) New methodology for reliability evaluation to incorporate protection system failure modes; and, 3) Application of variance reduction techniques and evaluation. A new model of current-carrying component paired with its associated protection system has been proposed. The model differentiates two protection failure modes, and it is the foundation of the proposed research. Detailed stochastic features of system contingencies and corresponding responses are considered. Both adequacy and security reliability indices are computed. Moreover, a new reliability index ISV (Integrated System Vulnerability) is introduced to represent the integrated reliability performance with consideration of protection system failures. According to these indices, we can locate the weakest point or link in a power system. The whole analysis procedure is based on a non-sequential Monte Carlo simulation method. In reliability analysis, especially with Monte Carlo simulation, computation time is a function not only of a large number of simulations, but also time-consuming system state evaluation, such as OPF (Optimal Power Flow) and stability assessment. Theoretical and practical analysis is conducted for the application of variance reduction techniques. The dissertation also proposes a comprehensive approach for a TTC (Total Transfer Capability) calculation with consideration of thermal, voltage and transient stability limits. Both steady state and dynamic security assessments are included in the process of obtaining total transfer capability. Particularly, the effect of FACTS (Flexible AC Transmission Systems) devices on TTC is examined. FACTS devices have been shown to have both positive and negative effects on system stability depending on their location. Furthermore, this dissertation proposes a probabilistic method which gives a new framework for analyzing total transfer capability with actual operational conditions

Social Citizenship and Institution Building: EU-Enlargement and the Restructuring of Welfare States in East Central Europe, CES Germany & Europe Working Paper no. 01.2, April 2001

With the EU-enlargement process well underway, this paper focuses on social citizenship as a conceptual frame for analyzing the restructuring of social institutions in applicant countries in East Central Europe. So far, comparative welfare state analysis has concentrated mainly on the developed economies of the OECD-countries; there is little systematic analytical work on the transitions in post-communist Europe. Theoretically, this paper builds on comparative welfare state analysis as well as on new institutionalism. The initial hypothesis is built on the assumption that emerging patterns of social support and social security diverge from the typology described in the comparative welfare state literature inasmuch as the transformation of postcommunist societies is distinctly different from the building of welfare states in Europe. The paper argues that institutionbuilding is shaped by and embedded in the process of European integration and part of governance in the EU. Anticipating full membership in the European Union, the applicant countries have to adapt to the rules and regulations of the EU, including the "social acquis." Therefore, framing becomes an important feature of institutional changes. The paper seeks to identify distinct patterns and problems of the institutionalization of social citizenship

Feminist Legal Scholarship: A History Through the Lens of the California Law Review

This Essay describes the evolution of feminist legal scholarship, using six articles published by the California Law Review as exemplars. This short history provides a window on the most important contributions of feminist scholarship to understandings about gender and law. It explores alternative formulations of equality, and the competing assumptions, ideals, and implications of these formulations. It describes frameworks of thought intended to compensate for the limitations of equality doctrine, including critical legal feminism, different voice theory, and nonsubordination theory, and the relationships between these frameworks. Finally, it identifies feminist legal scholarship that has crossed the disciplinary bound-aries of law. Among its conclusions, the Essay points out that as feminist scholarship has become more mainstream, its assumptions and methods are less distinct. It observes that even as feminist legal scholarship has generated important, insightful critiques of equality doctrine, it remains committed to the concept of equality, as continually revised and refined. The Essay also highlights the importance of feminist activism and practice in sharpening and refining feminist legal scholarship

Responsible Sovereign Lending and Borrowing

There are three reasons for attempting to reach a common understanding of the responsibilities of sovereign borrowers and their lenders. First, the flow of capital to sovereign debtors is exceptionally important to the world economy. Industrialized countries rely on it to finance their budget deficits, these days to a breathtaking extent. Developing countries need it to develop. Misbehaviour, either by the sovereign debtors or by the creditors, destabilizes this key component of the international financial system, making credit less available and more costly. Second, sovereign finance is uniquely unforgiving of mistakes. Unlike corporate or personal debtors, sovereigns do not have access to a formal bankruptcy process in which insupportable liabilities can be adjusted according to preestablished rules. From a legal standpoint, sovereign debts are therefore ineradicable absent the consent and cooperation of the creditors. Unfortunately, the process by which that consent and cooperation must be sought—sovereign debt restructuring —remains unpredictable and disorderly. Third, the human cost of prodigal sovereign borrowing, reckless sovereign lending or incompetent sovereign debt restructuring is incalculable. Perusing a major international newspaper on any day of any year is all that is required to make good this proposition. A consensus about the responsibilities of sovereign borrowers and lenders, together with improvements in the way in which sovereign loans are planned, executed, documented, and, when necessary, restructured, will directly affect the lives of most of the people that live on this planet

Rethinking militarism in post-apartheid South Africa

This paper argues that contemporary South Africa is marked by a co-existence of both old and new forms of militarism. It tries to move beyond the statist conception of militarism in much of the scholarly literature in order to examine social relations more broadly, and the appropriation of the means and instruments of violence by non-state groups. The paper argues that a shallow and uneven process of state demilitarisation was underway in South Africa from 1990 in the form of reductions in military expenditure, weapons holdings, force levels, demobilisation, employment in arms production and base closures. However, this has had contradictory consequences. The failure to provide for the effective social integration of ex-combatants throughout the Southern African region, as well as ineffective disarmament in post-conflict peace building, has provided an impetus to a 'privatised militarism'. This is evident in three related processes: new forms of violence, the commoditisation of security, through the growth of private security firms and, most importantly, the proliferation of small arms. It is argued that small arms are highly racialised and linked to a militarised conception of citizenship. This feeds into a militarist nationalism, which claims a powerful army as an indicator of state power, which helps to explain a process of re-militarisation - evident in the R60 billion re-armament programme and increasing reliance on the military as an instrument of foreign policy since 1998. The paper concludes by emphasizing the need for a regional approach to security as a further corrective to a narrow, statist focus on the South African National Defence Force