Fast Coordinated Power Control for Improving Inertial and Voltage Support Capability of Battery Energy Storage Systems

This paper proposes a fast coordinated power control method based on two augmented channels (AC) in battery energy storage system (BESS) to improve its inertial and voltage support capability, i.e., a frequency-reactive power channel (FRPC) and a voltage-real power channel (VRPC). For the frequency control, in the power distribution system with high resistance/inductance ratio, the coupling mechanism between rate of change of frequency (RoCoF) and required reactive power (RRP) of grids is analyzed, indicating that RoCoF is proportional to the RRP. Thus, RoCoF is utilized in the FRPC to generate reactive power for the complementary inertial emulating control. Meanwhile, for the voltage control, the coupling characteristics between rate of change of voltage (RoCoV) and demanding real power (DRP) of grids is also studied, revealing that RoCoV is proportional to the DRP. Therefore, it can be adopted in VRPC to generate real power for complementary voltage control. Then, the grid-voltage-modulated direct power control is selected as the inner power control loop to track the power references with faster dynamic performance comparing with traditional vector-oriented control. Finally, simulations and hardware-in-loop experiments validate the improvement in performance of grid frequency and voltage control based on the proposed method

Interethnic Union Formation among 1.5- and Second-generation Immigrants:The Role of Cultural Proximity

We examine 1.5- and second-generation immigrants’ union formation patterns in Denmark and how they relate to the cultural proximity between their countries of origin and Denmark as indicated by religion, values, and language. Drawing on administrative register data on 71,122 1.5- and second-generation immigrants from 120 different countries of origin, we use multilevel discrete-time event history analysis to examine the nexus between cultural proximity and union formation patterns. These models rigorously control for time-varying individual factors and changes in opportunity structures in local partner markets. Our results suggest that religion strongly relates to the 1.5- and second-generation immigrants’ union formation patterns. At the same time, this is not the case for the other cultural factors when we account for religion. Specifically, our results suggest that 1.5- and second-generation immigrants from non-Christian and especially from Muslim countries are less likely to form interethnic unions with natives and more likely to form intraethnic unions with same-country immigrants than their Protestant-background counterparts. Moreover, these patterns are most pronounced for women. Overall, we conclude that religion remains a strong predictor of interethnic union formation with natives among 1.5- and second-generation immigrants in Denmark and discuss the implications of this finding.</p

Shifting paradigms, not identities. LGBTIQ+ refugees queering temporalities in Denmark

In light of tightening immigration policies, LGBTIQ+ refugees are oftentimes presented as ‘stuck’ in the asylum regime, having to continuously perform their sexual orientation, gender identity and/or expression (SOGIE) in a fixed way. This article rethinks this narrative, arguing that rather than being stuck, LGBTIQ+ refugees are navigating through spatialised temporalities – during and after their asylum process. Drawing on semi-structured interviews with LGBTIQ+ refugees in Denmark, this article explores how LGBTIQ+ refugees queer temporality in multiple ways: First, I demonstrate how the so-called Danish “paradigm shift” is producing uncertain temporalities for LGBTIQ+ refugees. Second, I analyse how LGBTIQ+ refugees are becoming and remaining queer after having been granted asylum. Finally, I explore how LGBTIQ+ refugees are (un)able to “come out” of the asylum system. By claiming belonging to the Danish nation-state, they seek a change in the asylum system and demand permanent residence to express their SOGIE fluently

Rezension zu Dankwa, S. O., Filep, S.-M., Klingovsky, U., &amp; Pfruender, G. (Eds.). (2021). Bildung, Macht, Diversität: Critical Diversity Literacy im Hochschulraum. Transcript.

Book review for Dankwa, S. O., Filep, S.-M., Klingovsky, U., &amp; Pfruender, G. (Eds.). (2021). Bildung, Macht, Diversität: Critical Diversity Literacy im Hochschulraum. Transcript

Dual-level design for cost-effective sizing and power management of hybrid energy storage in photovoltaic systems

Integration of hybrid energy storage systems (HESS) into photovoltaic (PV) applications has been a hot topic due to their versatility. However, the proper allocation and power management schemes of HESS are challenges under diverse mission profiles. In this paper, a cost-effectiveness-oriented two-level scheme is proposed as a guideline for the PV-HESS system (i.e., PV, Li-ion battery and supercapacitor), to size the system configuration and extend battery lifespan while considering the power ramp-rate constraint. On the first level, a sizing methodology is proposed to balance the self-sufficiency and the energy throughput between the PV system and the grid to achieve the most cost-effectiveness. On the second level, an improved adaptive ramp-rate control strategy is implemented that dynamically distributes the power between the battery and supercapacitor to reduce the battery cycles. The case study presents the whole two-level design process in detail, and verifies the effectiveness of the proposed strategy, where the results show that the battery cycles are reduced by up to 13% over one year without affecting the self-sufficiency of the PV system

A post-normal environment-centered approach to engineering ethics education

This chapter probes engineering responses to contemporary socio-ecological challenges – like climate change and loss of biodiversity – and advocates for a new, post-normal engineering (PNE) paradigm. The chapter promotes cultivating, via reflection and dialogue, a nuanced ethical understanding for grappling with urgent socio-ecological problems, underscoring the need for a diverse palette of ethical frameworks for current and future engineers. The proposed PNE paradigm rejects today's conventional engineering practices and extractive cradle-to-grave model, prioritizing global responsibility and advocating for reflexivity in constructing new approaches to complex present-day issues. Existing theories like virtue ethics and utilitarianism (covered elsewhere in this handbook) remain pertinent in PNE, but environmental ethics takes center stage in this chapter. Through PNE, engineers are challenged to rethink – individually and collectively – their scope, behaviors, and roles in addressing socio-ecological crises. The chapter recognizes the interconnectedness of environmental and social concerns and advocates for generating a new and holistic approach that transcends engineering solutions that are purely technical