Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid

With a focus on the problems of active power sharing and voltage deviation of parallel-connected inverters in an islanded micro-grid (MG), in this study, the power-voltage droop controller and the inner voltage regulator are redesigned based on a total sliding-mode control (TSMC) technique. As for the power-voltage droop control loop, a droop control relation error between the active power and the point-of-common-coupling (PCC) voltage amplitude is defined. Then, the TSMC scheme is adopted to reach the new droop control relation, where the active power sharing and voltage amplitude recovery can be achieved simultaneously. Owing to the faster dynamic response and strong robustness provided by the TSMC framework, high-precision active power sharing during transient state also can be ensured without the influence of line impedances. The power allocation error can be improved by more than 81.2% and 50% than the conventional and proportional-integral (PI)-based droop control methods, respectively, and the voltage deviation rate can be reduced to 0.16%. Moreover, a small-signal model of the TSMC-based droop-controlled system is established, and the influences of control parameters on the system stability and the dynamic response are also investigated. The effectiveness of the proposed control method is verified by numerical simulations and experimental results.

Proxy control

The control dependency in grammar is conventionally distinguished into two classes: exhaustive (i→i) and non-exhaustive (i→i + (j)). Here, we show that, in languages like German and Italian, some speakers allow a new kind of “proxy control” which differs from both, such that, for a controller i, and a controllee j, j = proxy(i). The proxy function picks out a set of individuals that is discourse-pragmatically related to i. For such speakers, the German/Italian proxy control equivalent of the sentence: “Mariai asked Billj (for permission) [pro$_{proxy(i)}$ p r o x y ( i ) to leave work early]” would thus mean that Maria asked Bill for permission for some salient set of individuals related to herself to leave early. We examine the theoretical and empirical properties of this new control relation in detail, showing that it is irreducible to other, more familiar referential dependencies. Using standard empirical diagnostics, we then illustrate that proxy control can be instantiated both as a species of obligatory control (oc) and non-obligatory control (noc) in German and Italian and develop a syntactic and semantic model that derives each and details the factors conditioning the choice between the two. We also investigate the factors that condition different degrees of exhaustiveness (exhaustive vs. partial vs. proxy) in control, which then sheds light on why proxy control obtains in some languages, but not others and, within a language, is possible for some speakers but not others.

Control relation change into trust relationship in volunteering

The phenomenon of volunteering reveals itself through the time a person spends for volunteering, through the duration of the volunteering, the area in which volunteering occurs, and the age group of the volunteers. Object of the study – volunteering experiences of young adults. The issue of the research is how young adults experience volunteering in the social help field. The research is phenomenological and not focusing on any foreseen objectives, oriented to the experience of the volunteers. According to phenomenological approach, research methodology was Interpretative Phenomenological Analysis. In this article, part of the research is presented, giving deeper view on one of the super-ordinates theme, with the aim: to present change of control relation into the trust relationship with the Other in long term and full-time volunteering. In the study participated 6 research participants, 3 young men and 3 young women, 20 to 30 years old. To collect data of the research we used semi-structured interviews. Conclusions of the study, presented in this article, reveal: 1) The volunteers' experience of volunteering shows that the relationship of control in trying to fit the lives of met people into a personal imagination – what life should be like – changes through confrontation, surprise and even shock to discover authentic relationship of trust based no longer on appreciation but on intimacy and communion; 2) Hidden abilities of volunteers, new opportunities and self-disclosure are possible when a close relationship of trust is created; 3) Abandoning preconceptions about the Other and volunteering, the study participants changed the relationship of control to a relationship of trust. On that base, they began to volunteer in their environment without waiting for permission, instructions or other actions to legalize volunteering. As the relationship changed, as control shifted to a trust-based relationship with those around them, volunteers, realizing the experience, discovered the significance of volunteering, empowered by trust, and personal freedom and creativity; 4) The relativity of the study participants in volunteering was experienced dialogically, seeing the person and associating themselves with the person, and thus experiencing a constant interplay as ignorance, uncertainty, but at the same time as devotion and trust.

Control into infinitival relatives

This article focuses on a novel English construction involving control and infinitival relatives. Examples such as this is John's book to read have a head noun (book) modified by an infinitival relative clause (to read) and a prenominal possessor (John's). I argue that there is a control relation between the prenominal possessor and the PRO subject of the infinitival relative. I show that this control relation bears the structural hallmarks of obligatory control whilst at the same time permitting PRO to be interpreted as arbitrary. I discuss these empirical facts in the context of a syntactic, Agree-based theory of control.

Breaking the symmetry of geminates in diachrony and synchrony

Autosegmentalism invariably represents geminates in a symmetrical one-to-many relationship — as feature bundles or root nodes attached to two structural units: x-slots, moras, or C-slots. This symmetry, however, is often not reflected in their diachronic origin. For instance, in Blevins’ (2008) Type 1 pathway, only the second C of a consonant cluster (CC) ever determines the geminate: CxCy > CyCy, *CxCx (e.g. Latin > Italian). Moreover, although most synchronic processes identify geminates as symmetrical, there is an exception: geminate integrity. Unlike CCs and long vowels (LVs), geminates never ‘break’ by epenthesis: *CyCy > CyVCy. We propose that this is central to understanding the true nature of geminates, and present analyses in two frameworks. The first is ‘control by contiguity’, which uses head-dependent ‘control chains’ (Russo 2013). A control relation applies between a specified and an unspecified position: -C. Inalterability and integrity result from the asymmetry of the geminate’s positions. The second is based on Strict CV. This restricts a geminate’s melody to one of its two skeletal positions. Unlike CC and LVs, geminates do not involve a ‘trapped’ empty V position that could host epenthesis and cause breaking; the difference between LVs and geminates follows from framework-internal forces and suggests that melodic branching always requires licensing. These two approaches share the insight that the representation of geminates is not symmetrical, like that of long vowels.