Dr. Poria Astero
Electrical Engineering and Automation, Aalto University, Espoo, Uusimaa, Finland
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Academic Career Length
19Years (2008-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications10 April 2012 in IEEE Transactions on Power Systems
Journal Article
PAPoria Astero
Poria Astero
AAArash Alimardani
Arash Alimardani
SHS.H Hosseinian
S.H HosseinianMAMehrdad Abedi
Mehrdad Abedi
Poria AsteroIn designing procedure of a power sharing controller for a voltage source converter (VSC)-based microgrid with no communication link, three issues should be considered. Firstly, in VSC-based microgrids, which use droop controller method, the desired frequency of VSCs is altering regarding the output active power. Consequently, the conventional load frequency control techniques are inappropriate since their operation is based on a fixed pre-specified desired frequency. Secondly, to prevent circulating current and thermally overstressing, all DGs should participate in active power supply. In addition, since there is no communication link, the steady state value of each micro-source active power is unknown. Therefore, the conventional fixed active power control method for DGs is not appropriate. Thirdly, when the microgrid loads are increased, the output power of VSCs is increased rapidly; however, the output power of each VSC's primary source could not change in the same rate to respond. It causes the DC voltage of VSCs to decrease, which could affect the appropriate performance of VSCs. In this paper, a novel control strategy for VSCs and an energy storage system in a VSC-based microgrid without communication link accompanied with a novel hybrid model of VSC-based DGs, which considers primary source effect, is proposed.
11 August 2017 in IET Generation, Transmission & Distribution
Journal Article
The future smart grids (SGs) consist of considerable amount of renewable energy sources (RESs), electrical vehicles (EVs), and energy storage systems (ESSs). The uncertainties associated with EVs and uncontrollable nature of RESs have magnified voltage stability challenges and the importance of an effective energy management system (EMS) in SGs as a practical solution. This study presents a multi‐agent transactive energy management system (TEMS) to control demand and supply in the presence of high levels of RESs and EVs, and maximises profit of each participant in addition to satisfying voltage regulation constraints. For this purpose, a real‐time pricing is considered based on Cournot oligopoly competition model for demand and merit order effect for production to compensate RESs’ fluctuations in real time by an indirect control method. Simulations are conducted in the modified IEEE 37‐bus test system with 1141 customers, 670 EVs, two solar plants, four wind turbines, and one ESS. The results show that the proposed multi‐agent TEMS can indirectly control EVs, elastic loads, and ESSs to balance the RESs oscillation, minimise customers cost, and regulate voltage in a real‐time manner.
20 September 2017 in IEEE Transactions on Smart Grid
Journal Article
Poria AsteroLSLennart Söder
Lennart Söder
High integration of rooftop photovoltaic (PV) plants in distribution systems leads to new technical challenges: reverse-active power and voltage rise in low-voltage (LV) and medium-voltage (MV) grids. These challenges limit the maximum amount of power can be produced by PVs in LV and MV grids, called the hosting capacity (HC). Battery storage systems (BSSs) have been used in many studies to decrease the reverse power and improve the HC by controlling the active power. However, the influence of a central BSS on the HC can be greatly improved by using a quadratic power control, simultaneous active and reactive power control, and by selecting of the optimal battery size, the converter size, and the place of the central BSS. The effectiveness of the quadratic power control was not seen in previous works due to the fact that grids with one level of voltage without modeling of MV/LV transformers were simulated. This paper develops a method to select the optimal size of the battery and converter unit as well as the optimal place of an LV-central BSS having an optimal quadratic power control. The simulation results show considerable effects of the optimal selection of an LV-central BSS on the HC improvement.
14 September 2012 in IEEE Transactions on Power Systems
Journal Article
PAPoria Astero
Poria Astero
SHS.H Hosseinian
S.H HosseinianMAMehrdad Abedi
Mehrdad Abedi
Poria AsteroThis paper presents a multi-stage fuel consumption minimization method in an autonomous voltage source converter (VSC)-based microgrids considering microgrid small signal stability (SSS) margin, frequency and voltage regulation, and the minimum and maximum allowable range of active and reactive output power of VSCs. In VSC-based microgrid, the parameters of each VSC power sharing controller have significant influence on microgrid SSS margin, frequency and voltage regulation, and the ratio of active and reactive power shared between VSCs. Considering all of these effects in fuel consumption minimization method with straightforward technique leads to having a complicated constrained optimization problem, which cannot be solved in a short time. The computation time of solving this optimization problem is very important in practical applications. In order to eliminate this problem, a multi-stage method is developed in this paper. This method can optimize the fuel consumption and consider the output active and reactive power limit, SSS margin, and frequency and voltage regulation in different stages without significant interactions on each other. Hence, the computation time is strongly reduced. The simulation results in a microgrid, which has a wind turbine, two gas turbines, and a micro-turbine with heat load, demonstrate the effectiveness of the proposed method.
12 December 2022 in IEEE Access
Journal Article
Karar MahmoudPAPoria Astero
Poria Astero
PPPasi Peltoniemi
Pasi Peltoniemi
Matti LehtonenPoria AsteroDriven by environmental and economic aspects, the proliferation of renewable energy sources (RES) has been expanded in power systems worldwide. In this regard, the intermittent generation of such RESs (e.g., photovoltaic and wind farms) can cause several operational and stability problems in such low-inertia power systems. To handle these issues, great interest in the literature has been directed to develop feasible grid-forming voltage source converters (VSC) control schemes that have voltage/frequency regulatory functions. Accordingly, an inclusive review is presented in this paper for these promising grid-forming VSC control schemes which will be the backbone of sustainable converter-dominated power systems. Specifically, control structures, smart grid-support functionalities, stability issues, and fault current mitigations are compared considering the existing grid-forming VSC control schemes. Besides, the applications of grid-forming VSC along with their benefits and drawbacks are investigated for both isolated and bulk power systems. The evaluation aspects are also explored for assessing the performance of the existing VSC control schemes in the grid. Finally, the current challenges that face VSC in forthcoming applications and existing gaps are highlighted while corresponding perspectives for future research studies are defined for stable sustainable low-inertia power systems.
4 October 2018 in IEEE Transactions on Energy Conversion
Journal Article
High penetrations of renewable energy sources (RES) in distribution grids lead to new challenges in voltage regulation. These challenges are not just limited to the steady-state voltage rise, but they are extended to rapid voltage changes due to wind speed variations and moving clouds, casting shadow on PV panels. According to EN50160 in LV grids, the steady-state voltage should not exceed 1.1 pu (static characteristic), and voltage rapid changes should be kept less than 0.05 pu (dynamic characteristic). These two characteristics may limit the maximum amount of RES that can be installed in LV grids, called respectively the static hosting capacity (SHC) and dynamic hosting capacity (DHC). Although existing research just evaluated SHC in distribution grids, high penetrated RES grids can be faced with such large voltage changes which cause a smaller DHC than the SHC. This paper studies both SHC and DHC in distribution grids and proposes an adaptive controller for STATCOMs to regulate steady-state and dynamic voltage while avoiding unnecessary increase in reactive power. The simulation results in some German distribution grids show considerable effects of the proposed adaptive controller on improving both SHC and DHC.
About Me
Poria Astero is a highly accomplished researcher, actively involved in academic and industrial research and innovation to drive the transition towards green energy. He currently holds the position of Research Fellow at Aalto University's power system lab, where he serves as the PI of the CloudInertia project, focusing on the control and stability of power systems dominated by grid-forming inverters.
With a PhD in Electrical Engineering awarded in 2012, Poria has accumulated extensive experience working across various industrial and academic sectors, contributing to energy system research, business, and market development. He has led several research and innovation projects as the PI, work package leader, or task leader. Notably, Poria served as the Northern Demonstrators Work Package Leader in OneNet and iFLEX, two significant EU projects that aimed to develop an end-to-end, multi-purpose, cross-border, TSO/DSO coordinated, market-driven, and holistic solution for flexibility and new service provisions. Poria's expertise in the field has also led to his appointment as an expert member of the ETIPS NET Smart Grid working group.
Poria's research activities are centred on smart grids, power system stability and control, the integration of renewable energy sources, power system planning, and the energy market. Furthermore, he is a certified "Senior Project Manager, IPMA Level B," possessing extensive expertise in leading demanding and complex projects.