Evaluation of Load Frequency Control Performance Based on Standard Deviational Ellipses

Polajžer, Boštjan; Brezovnik, Robert; Ritonja, Jožef

doi:10.1109/tpwrs.2016.2605152

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…The gravity center of carbon emissions was calculated according to Equation (2) [40], and ArcGIS v.10.2 was used to calculate both the gravity center and GDP:…”

Section: Methods For Analyzing the Evolution Of Spatial Characteristicsmentioning

confidence: 99%

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Spatiotemporal Evolution of Carbon Emissions According to Major Function-Oriented Zones: A Case Study of Guangdong Province, China

Zhu

Huang

et al. 2023

IJERPH

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Studying the spatiotemporal evolution of carbon emissions from the perspective of major function-oriented zones (MFOZs) is crucial for making a carbon reduction policy. However, most previous research has ignored the spatial characteristics and MFOZ influence. Using statistical and spatial analysis tools, we explored the spatiotemporal characteristics of carbon emissions in Guangdong Province from 2001 to 2021. The following results were obtained: (1) Carbon emissions fluctuated from 2020 to 2021 because of COVID-19. (2) Over the last 20 years, the proportion of carbon emissions from urbanization development zones (UDZs) has gradually decreased, whereas those of the main agricultural production zones (MAPZs) and key ecological function zones (KEFZs) have increased. (3) Carbon emissions efficiency differed significantly among the three MFOZs. (4) Carbon emissions from coastal UDZs were increasingly apparent; however, the directional characteristics of MAPZ and KEFZ emissions were not remarkable. (5) Carbon transfer existed among the three kinds of MFOZs, resulting in the economy and carbon emissions being considerably misaligned across Guangdong Province. These results indicated that the MFOZ is noteworthy in revealing how carbon emissions evolved. Furthermore, spatiotemporal characteristics, especially spatial characteristics, can help formulate carbon reduction policies for realizing carbon peak and neutrality goals in Guangdong Province.

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“…The gravity center of carbon emissions was calculated according to Equation (2) [40], and ArcGIS v.10.2 was used to calculate both the gravity center and GDP:…”

Section: Methods For Analyzing the Evolution Of Spatial Characteristicsmentioning

confidence: 99%

“…In contrast, when the long and short semi-axes are closer, the directivity of the data is less apparent. The equation for calculating the standard deviation ellipse is shown in Equation ( 3) [40], and ArcGIS v.10.2 was used to generate the standard deviation ellipses.…”

Section: Methods For Analyzing the Evolution Of Spatial Characteristicsmentioning

confidence: 99%

Spatiotemporal Evolution of Carbon Emissions According to Major Function-Oriented Zones: A Case Study of Guangdong Province, China

Zhu

Huang

et al. 2023

IJERPH

View full text Add to dashboard Cite

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“…Kernel density analysis is used to calculate the density and distribution characteristics of each point in its surrounding neighborhood [25]. Standard deviation ellipse analysis is used to measure the existing pseudo-Manchurian architectural community direction and distribution [26]. Buffer analysis and spatial overlay analysis, based on points, create a buffer layer according to a certain radius, and use the superimposed area of each site's buffer zone and the relatively independent area after superposition as a reference for determining the protection zone of the sites.…”

Section: Methodsmentioning

confidence: 99%

Integrated Zoning Protection of Urban Remains from Perspective of Sustainable Development—A Case Study of Changchun

et al. 2022

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In recent years, the development of urbanization in China has entered a new stage with “quality” as its core. In the process of sustainable urban development, urban planning and construction relics are precious historical warnings and educational resources, and in the stage of accelerated urbanization, social transformation, and industrial upgrading, urban sites face severe pressure and challenges for conservation. This paper presents a summary analysis of various international charters concerning historical and cultural heritage in recent times, and analyzes the urban spatial structure, urban functional zoning, and the differences and evolutionary characteristics of urban construction sites between the pseudo-Manchukuo Xinjing plan and other regions of the world in the same period from a global perspective. The city of Changchun is also used as an example to systematically analyze the existing relics in Changchun using a historical-geographical perspective and spatial analysis methods. The results show that, firstly, the conservation objects of Chinese relics are being enriched and the scope of protection is being expanded, but that there is a lack of protection and utilization of urban heritage and its surrounding environment. Secondly, that the road network system and spatial structure of the pseudo-Manchukuo Xinjing city planning are basically preserved, that the urban green space and functional zoning have been changed, and that the architectural relics show a spatial distribution trend of north-north-east. Thirdly, that the urban functional zoning has been used to construct an urban relics protection area in which three suggestions for the protection of urban relics have been put forward: to establish a holistic protection system for urban planning functional areas; to establish a “district-axis-point” trinity protection model to promote the effective function recovery of urban planning and construction functional areas; and to continue the effective functions of the city. This provides reference for the study of modern urban planning ideas and solutions for current sustainable urban development, upgrading of public service facilities, and green low-carbon urban transformation.

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“…Huangpu is the future industrial center of Guangzhou City, and Nansha will be built as the sub-center of We introduced two tools that could more intuitively display the difference in the new urban land quota allocation, the gravity center and standard deviation ellipse, which are widely used to characterize allocating geographical elements [58]. The concept and calculation method for the gravity center and standard deviation ellipse can be found in Polajzer's research [59]. In Figure 13, it is evident that the gravity center of the new urban land in the inertial scenario mainly moved to the north by approximately 0.8 km every year.…”

Section: Differential Analysis Of Quota Allocationmentioning

confidence: 99%

Quota and Space Allocations of New Urban Land Supported by Urban Growth Simulations: A Case Study of Guangzhou City, China

Zhu

Liu

et al. 2023

Land

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Previous allocations of new urban land were ineffective because they lacked synergy between quota and space, challenging the government planning authority. This study proposes a new and more reasonable urban land allocation method to guide the smart growth of cities. We used a logistic regression model and multisource data to explore the laws of urban growth and employed a cellular automata (CA) model to simulate this under inertial and constrained scenarios. In addition, the disparities between both scenarios concerning allocation were analyzed. We realized the synergy of quota and space allocations of new urban land through urban growth simulation. Further, the allocation of new urban land was more consistent with the development strategy of Guangzhou under a constrained scenario. The allocation of space was more regular and concentrated under a constrained scenario, which aligns with the requirements of the Government Land Space Planning. Additionally, in the constrained scenario, the bottom lines of cultivated land protection, ecological service, and geological safety were better controlled. This study compensated for the shortcomings of the disjoined quota and space allocations of new urban land and proved that a constrained scenario can more effectively promote reasonable urban growth.

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Evaluation of Load Frequency Control Performance Based on Standard Deviational Ellipses

Cited by 12 publications

References 20 publications

Spatiotemporal Evolution of Carbon Emissions According to Major Function-Oriented Zones: A Case Study of Guangdong Province, China

Spatiotemporal Evolution of Carbon Emissions According to Major Function-Oriented Zones: A Case Study of Guangdong Province, China

Integrated Zoning Protection of Urban Remains from Perspective of Sustainable Development—A Case Study of Changchun

Quota and Space Allocations of New Urban Land Supported by Urban Growth Simulations: A Case Study of Guangzhou City, China

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