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Yang, Ying
Publications (6 of 6) Show all publications
Yan, J., Yang, Y., Campana, P. E. & He, J. (2019). City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China. Nature Energy, 4(8), 709-717
Open this publication in new window or tab >>City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China
2019 (English)In: Nature Energy, ISSN 2058-7546, Vol. 4, no 8, p. 709-717Article in journal (Refereed) Published
Abstract [en]

In recent years, China has become not just a large producer but a major market for solar photovoltaics (PV), increasing interest in solar electricity prices in China. The cost of solar PV electricity generation is affected by many local factors, making it a challenge to understand whether China has reached the threshold at which a grid-connected solar PV system supplies electricity to the end user at the same price as grid-supplied power or the price of desulfurized coal electricity, or even lower. Here, we analyse the net costs and net profits associated with building and operating a distributed solar PV project over its lifetime, taking into consideration total project investments, electricity outputs and trading prices in 344 prefecture-level Chinese cities. We reveal that all of these cities can achieve—without subsidies—solar PV electricity prices lower than grid-supplied prices, and around 22% of the cities’ solar generation electricity prices can compete with desulfurized coal benchmark electricity prices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
Keywords
Commerce, Electric power generation, Electric power transmission networks, Profitability, Solar concentrators, Solar energy, Solar power generation, Coal electricities, Electricity generation, Electricity output, Electricity prices, Solar electricity, Solar photovoltaic electricity, Solar photovoltaics, Solar PV systems, Costs
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-45100 (URN)10.1038/s41560-019-0441-z (DOI)000481484400019 ()2-s2.0-85070785396 (Scopus ID)
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-10-11
Ekman, P., Röndell, J. & Yang, Y. (2019). Exploring smart cities and market transformations from a service-dominant logic perspective. Sustainable cities and society, 51, Article ID 101731.
Open this publication in new window or tab >>Exploring smart cities and market transformations from a service-dominant logic perspective
2019 (English)In: Sustainable cities and society, ISSN 2210-6707, Vol. 51, article id 101731Article in journal (Refereed) Published
Abstract [en]

This study addresses the emergence of new actors and their roles in the transformation of smart cities. By building on a Service-Dominant logic perspective, the study capture how smart city transformation is closely related to a smart market transformation. While prior conceptualizations of markets have followed a linear supply-demand structure, the new market conceptualization can be described as a service ecosystem. The study empirically follows the increased use of renewable energy, such as photovoltaic (PV) systems and their related services, as they are incorporated into smart cities. The results reveal that the overall interaction level among the involved actors increases as the energy market changes from a linear to a networked logic. This transition impacts the market's information quality and, subsequently, the actors’ level of required knowledge. The study shows that even if the prevailing actors become more informed, information needs to be ‘translated’ into ‘knowledge-in-context’ to become a valuable resource. Thus, the resulting service ecosystem demands a complementary actor that requires the role of a knowledge broker to function. The paper describes the mechanisms behind this smart city transformation and clarifies the broker functions.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
National Category
Energy Systems
Identifiers
urn:nbn:se:mdh:diva-44962 (URN)10.1016/j.scs.2019.101731 (DOI)2-s2.0-85069897223 (Scopus ID)
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-10-02
Yan, J., Wu, J., Yang, Y., Li, H., Wang, H. & Wang, X. (2018). Editorial cleaner energy for cleaner city. Paper presented at 27 June 2018 through 29 June 2018. Energy Procedia, 152, 1-2
Open this publication in new window or tab >>Editorial cleaner energy for cleaner city
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2018 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 152, p. 1-2Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Applied energy, Low carbon, Smart eco-cities, Tongji University, Urban energy
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41781 (URN)10.1016/j.egypro.2018.09.049 (DOI)2-s2.0-85058226443 (Scopus ID)
Conference
27 June 2018 through 29 June 2018
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-10-02
Zhang, Y., Campana, P. E., Yang, Y., Stridh, B., Lundblad, A. & Yan, J. (2018). Energy flexibility from the consumer: Integrating local electricity and heat supplies in a building. Applied Energy, 223, 430-442
Open this publication in new window or tab >>Energy flexibility from the consumer: Integrating local electricity and heat supplies in a building
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 223, p. 430-442Article in journal (Refereed) Published
Abstract [en]

The increasing penetration level of renewable energy requires more flexibility measures to be implemented in future energy systems. Integrating an energy consumer’s local energy supplies connects multiple energy networks (i.e., the electrical grid, the district heating network, and gas network) in a decentralized way. Such integration enhances the flexibility of energy systems. In this work, a Swedish office building is investigated as a case study. Different components, including heat pump, electrical heater, battery and hot water storage tank are integrated into the electricity and heat supply system of the building. Special focus is placed on the flexibility that the studied building can provide to the electrical grid (i.e., the building modulates the electricity consumption in response to the grid operator’s requirements). The flexibility is described by two metrics including the flexibility hours and the flexibility energy. Optimization of the component capacities and the operation profiles is carried out by using Mixed Integer Linear Programming (MILP). The results show that the system fully relies on electricity for the heat demand when not considering the flexibility requirements of the electrical grid. This suggests that district heating is economically unfavorable compared with using electricity for the heat demand in the studied case. However, when flexibility requirements are added, the system turns to the district heating network for part of the heat demand. The system provides great flexibility to the electrical grid through such integration. The flexibility hours can be over 5200 h in a year, and the flexibility energy reaches more than 15.7 MWh (36% of the yearly electricity consumption). The yearly operation cost of the system slightly increases from 62,273 to 65,178 SEK when the flexibility hours increase from 304 to 5209 h. The results revealed that flexibility can be provided from the district heating network to the electrical grid via the building.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-39298 (URN)10.1016/j.apenergy.2018.04.041 (DOI)000433649900030 ()2-s2.0-85046664444 (Scopus ID)
Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-09-18Bibliographically approved
Yang, Y., He, J., Wang, S., Kang, X., Zhang, Y., Campana, P. E. & Yan, J. (2018). Industrial And Commercial Distributed Solar PV Grid Parity Map: Based On The Analysis Of 345 Prefecture‐ Level Cities In China. In: : . Paper presented at Renewable Energy Integration with Mini/Microgrid REM2018, Rhodes, Greece, September 28-30, 2018.
Open this publication in new window or tab >>Industrial And Commercial Distributed Solar PV Grid Parity Map: Based On The Analysis Of 345 Prefecture‐ Level Cities In China
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2018 (English)Conference paper, Published paper (Refereed)
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41685 (URN)
Conference
Renewable Energy Integration with Mini/Microgrid REM2018, Rhodes, Greece, September 28-30, 2018
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-10-02
Yang, Y., Zhang, Y., Campana, P. E. & Yan, J. (2017). Peak-shaving and profit-sharing model by Aggregators in residential buildings with PV- a case study in Eskilstuna, Sweden. Energy Procedia, 142, 3182-3193
Open this publication in new window or tab >>Peak-shaving and profit-sharing model by Aggregators in residential buildings with PV- a case study in Eskilstuna, Sweden
2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, p. 3182-3193Article in journal (Refereed) Published
Abstract [en]

Nowadays, photovoltaic (PV) system combined with energy storage systems is playing increasing significant role in residential buildings in Sweden. At the same time it brings reliability problems because of the intermittency of electricity production and exceptionally distributed reservoir which is followed by the peak-valley electricity prices and power grid fluctuations. There is an increasing need for new business model and economic paradigm for a third party aggregator to bridge the gap between Power Grid and end-users. Providing the valuable electricity services at scale and breaking regulatory arbitrage, aggregators help to deliver desired levels of residents’ engagements, value-added services and feasible level of unbundling of electricity market. This paper analyzes how the aggregators grab the indisputable business opportunity to interact between residents and Power Grid from the perspective of physical electricity flows and benefits share of peak-shaving. We employ a real case in Eskilstuna in Sweden to design new business model and validate using data. And the result indicates the compatibility of the aggregator service and its business model. It further sheds light on the pricing model of generated electricity by PV system, and benefits share ratio design.

Place, publisher, year, edition, pages
Elsevier Ltd, 2017
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-38719 (URN)10.1016/j.egypro.2017.12.488 (DOI)000452901603054 ()2-s2.0-85041532112 (Scopus ID)
Available from: 2018-03-01 Created: 2018-03-01 Last updated: 2019-01-03Bibliographically approved
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