No abstract

This paper deals with the problem of large wind power integration and its potential impact on systems small signal stability. Factors like grid configuration, load and wind power integration are considered. An automatic algorithm is used to search the space formed by such parameters and generate a representative set of possible operation conditions. The oscillation modes are then calculated for each operation point. Some of these points of operation are subjected to a deeper analysis and the movement of oscillation modes on the complex plane is evaluated. Finally, non-linear time domain simulations are presented.

Requirements for inertial response (IR) from wind turbines (WTs) have been implemented or drafted by power systems (PSs) operators worldwide. This is a response to the replacement of conventional power plants using synchronous generators by non-synchronous, power electronics-based generation and the resulting effect on frequency dynamics in the case of contingency events. The additional active power provided during operation in IR mode must be drawn from the rotating masses. A re-acceleration accompanied by reduced active power output follows the activation phase. The allowed depth and duration of the post-inertial recovery will be regulated in future versions of grid codes, e.g. in Québec and Ireland. This study describes an improved version of an IR control system that enables a more PSs-friendly provision of such short-term frequency support. The new controls allow adjusting the duration of the recovery period. Potential negative effects of IR from WTs on the PS in the form of a second frequency nadir during the recovery phase can be minimised. The outcome of simulations and of field testing will be presented. All results shown in this study include the initial and the future inertia emulation performance which allows easy comparison of the two controls.

Breast cancer remains significantly distressing and produces profound changes in women’s lives. Spirituality is an important resource at the time of diagnosis and treatment decisions. This qualitative study aimed to explore the spiritual experience of women diagnosed with breast cancer and the considerations of spirituality in health care using the existential phenomenology approach. The sampling procedure was intentional, based on the study’s exclusion and inclusion criteria. Forty women participated in individual interviews. The research was conducted in the outpatient clinic of a reference federal university hospital in South-Eastern Brazil. Throughout the research process, ethical principles were carefully followed. Five themes were identified: (1) meaning of spirituality–source of spiritual strength, (2) well-being in the relationship with God, (3) well-being in religious fellowship, (4) values and purpose of life–meaning in life, and (5) spirituality as a foundation to continue. Respect for patient’s spiritual values was recognised as a fundamental principle in health care. Spirituality was revealed as a source of support during the complex process of being diagnosed with breast cancer. Thus, health care professionals that value and encourage spirituality are needed, favouring better patient response to the diagnosis.

Objective: reveal experiences of cancer patients undergoing neurotoxic chemotherapy. Method: phenomenology-based, qualitative study, carried out with nine adult patients in antineoplastic neurotoxic treatment, interviewed in June and July 2018. The testimonies were analyzed using an empirical comprehensive model. Results: the following categories were delineated: nerves on edge: perception of limitations caused by neuropathic pain induced by chemotherapy; chemotherapy drains me of energy; the suffering of starting again; the suffering of enduring it; alone in a desert, I heard the cry of my silence; chemotherapy: an infusion of hope; and there is no suffering on earth that heaven cannot heal. Conclusion: the study presented various meanings of suffering that emerge from experiences with neurotoxic treatment and found that many dimensions of suffering interpenetrate, making it impossible to disassociate them.