Pasi Peltoniemi

Pasi Peltoniemi
Lappeenranta – Lahti University of Technology LUT · School of Energy Systems

D.Sc.

About

79
Publications
34,588
Reads
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1,185
Citations
Citations since 2017
19 Research Items
752 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (79)
Article
Full-text available
In this paper, different power balance control methods for hybrid marine vessels are analyzed. First, the power grid of a marine vessel is modeled using MATLAB and Simulink. Simulations are then performed using real power plant load data captured from an actual vessel. Isochronous control is used to control the power of the diesel gensets, and diff...
Article
Full-text available
Driven 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, g...
Article
This paper proposes a generally applicable method of optimizing the power and energy balance of the main vessel producer and consumer units. The method is also used after an equipment failure as part of the power management process flow. The method proposes that the route plan is divided into distance steps and an optimization algorithm is used to...
Technical Report
Full-text available
Ministry of Economic Affairs and Employment of Finland. MEAE Sector Reports 2021:6. In June 2020, The Ministry of Economic Affairs and Employment of Finland launched work to formulate a national battery strategy that will enable Finland to strengthen its role as a pioneer in sustainable battery manufacturing and recycling. The working group consi...
Book
Full-text available
The decarbonization, digitalization and automation of global shipping are intensifying due to high pressure and need from the regulatory, environmental, economic and technological perspectives. The INTENS project is one of the ongoing Finnish major R&D efforts towards smart and green shipping, which is an industry-wide collaborative research and in...
Conference Paper
The use of electric vehicles and inverter-controlled ventilation will increase in the future in underground mines. DC microgrids are analyzed during the last years to be used e.g. in solar and wind farms, ships and datacenters. The possibility to use DC microgrid in a mine production area is analyzed in this study. The steady-state calculations are...
Article
Full-text available
Significant growth in residential solar photovoltaic (PV) installations and the ongoing decline in battery costs have increased interest in household solar battery energy storage projects in Finland in recent years. Among various potential applications, considerable attention is drawn to the use of the battery energy storage system (BESS) for the p...
Book
Full-text available
The global marine cluster is in major transition to smart and green shipping. The pressure and need for the decarbonization, digitalization and automation in shipping are high from regulatory, environmental, economic and technological perspectives, which poses challenges and opportunities to the cluster. It is imperative for Finland since the hi-te...
Article
Application of energy storages (ES) in power distribution systems (PDS) of short sea shipping marine vessels is gaining ground. The main drivers are the increasing demand for higher energy efficiency and the decreasing costs of battery energy storage systems (BESS). The feasible chemistry and dimensioning of the BESS depend heavily on the vessel ty...
Conference Paper
Full-text available
Effective teaching of automation and control engineering technology for undergraduate students is of great importance in contributing to the knowledge and skills needed in the engineering profession. Enriching the teaching with animation-based learning material enhances the quality of teaching, bridges the gap between theory and practice, and promo...
Article
The idea of damming the Congo River has persisted for decades. The Grand Inga project, of up to 42 GW power generation capacity, can only be justified as part of a regional energy master plan for Africa, to bridge the energy gap on the continent. Proponents of very large dams have often exaggerated potential multiple benefits of a mega dam, margina...
Technical Report
Full-text available
Neo-Carbon Energy is the largest renewable energy research in the Finnish history. We are creating a completely new energy system where the produced energy is emission-free, cost-effective and independent. We are solving renewable energy’s flexible use, storage and distribution. This will revolutionise the entire energy field. The project is carrie...
Article
Full-text available
Multiphase electric machines can provide significant advantages over conventional three-phase machines. Unfortunately, multiphase machines also have a notable disadvantage that even a small voltage excitation of certain frequency components can cause large stator current harmonics. This paper presents an inverse-based current harmonic controller to...
Article
Full-text available
The application of the gradient heat flux sensor as a failure and aging indicator of the power electronics was studied in this paper. Conducted experiments shown that the heat flux sensor attached to the insulated-gate bipolar transistor’s (IGBT’s) base plate can provide realtime heat flux monitoring. Condition monitoring (CM) model implemented in...
Article
Full-text available
This paper proposes and investigates the application of the gradient heat flux sensor (GHFS) for measuring the local heat flux in power electronics. Thanks to its thinness, the sensor can be placed between the semiconductor module and the heat sink. The GHFS has high sensitivity and yields direct measurements without an interruption to the normal p...
Article
Full-text available
Dual three-phase electric machines are known to offer many important advantages compared with their conventional three-phase counterparts. However, these machines also suffer from a significant disadvantage of easily occurring large stator current harmonics. To solve this problem, this paper introduces a current harmonic elimination method based on...
Article
In this paper, common-mode (CM) and radio frequency (RF) electromagnetic interferences (EMIs) in a low-voltage direct current (LVDC) distribution network are investigated. LVDC being a novel approach to public electricity distribution, a research site was set up in a public rural-area distribution network to enable comprehensive studies concerning...
Article
Full-text available
Multiphase electric machines are known to have problems with stator current harmonics. The harmonics can be eliminated by various current harmonic compensation methods. However, using the active harmonic compensation can increase the required output voltage of the inverter supplying the machine. Because the maximum voltage is limited, complete elim...
Conference Paper
The modern low-voltage direct current (LVDC) distribution system merges ICT, power electronics and conventional grid technologies into single system. This paper gives an overview to the LVDC RULES research project and presents its first key results. The foundations of the project are laid by the lessons learned during earlier research projects. Imp...
Conference Paper
In this paper, two types of isolated converter topologies for the implementation of the galvanic isolation of a low-voltage DC network is discussed. Advantages and problems of the topologies are compared and a selection for the suitabletopology for two conversion ratios, 1:1 and 2:1 is carried out.The selection is carried out by comparing the lifet...
Conference Paper
Full-text available
Renewable energy production, such as solar and wind power, require energy storage systems because of their intermittent nature. Hydrogen is potential candidate to store energy, because it has high-energy content capacity also in long term and it is possible to build affordable large-scale energy storages based on hydrogen. This paper studies solar...
Conference Paper
The subject addressed is the energy efficiency (EE) of LVDC electricity distribution system. The focus of the paper is on the development trends and the dependencies of the system EE. In the paper, the prospects of development of LVDC electricity distribution EE is presented using quantitative results and the system development challenges are discu...
Conference Paper
This paper analyses the life-cycle cost of a customer-end inverter that is used in a low voltage DC distribution system. Cost of the losses during the utilization period of the system and the investment cost of the main components is included in the study and the distribution between them is analyzed to determine the dominating cost factors. A sens...
Conference Paper
The paper focuses on developing the control for directly connected battery energy storage system (BESS) in low voltage direct current (LVDC) distribution systems. The main purpose of the control is to provide essential connection/disconnection and charge/discharge functions. Additionally, due to direct connection, it is necessary to implement contr...
Article
This paper concentrates on the effects of d.c. mains voltage level selection on earthing and protection of the low voltage direct current (LVDC) distribution systems. Among the low voltage range the possibilities are to go up to 1500 VDC in unipolar and ±750 VDC in bipolar LVDC system. Voltage level selection is one of the main tasks in LVDC system...
Article
In this paper, the results of the energy efficiency and power loss measurements of a 16 kVA customer-end inverter (CEI) unit are analyzed. The CEI is part of the low-voltage dc (LVDC) distribution network. The efficiency of the CEI power conversion significantly affects the energy efficiency of the LVDC distribution network and the electricity supp...
Article
In this paper the need for a better design of the galvanic isolation and the output filter inductor in the customer-end inverter (CEI) of the low voltage DC (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer after the CEI or with an isolated DC-DC converter between the DC network and the CEI. Howe...
Article
This paper introduces a research site for a low-voltage direct current (LVDC) distribution system. The research site was established to enable practical studies concerning different areas of the LVDC distribution. Because the LVDC distribution is a novel approach to public electricity distribution, the objective is to combine a fully functional LVD...
Conference Paper
In this paper the implementation of a modular customer-end inverter (CEI) for a low voltage DC (LVDC) distribution network is discussed. Selection of the nominal power of one inverter module, the effect of the switching frequency and input DC voltage on the lifetime cost is studied. The design goal is set for minimum lifetime cost of the inverter a...
Conference Paper
Full-text available
This paper introduces a general method to transform dynamic system models between two-axis reference frames that are rotating at different angular frequencies. Such a transformation is needed in the analysis and implementation of a control system where the entire system is not presented in the same reference frame. Detailed derivation of the transf...
Conference Paper
Environmental concerns have led to increased penetration of renewable energy sources into the power grid. Many researches have considered localized and small-scale renewable energy sources supplying microgrids - small-scale localized distribution networks - as a backup to the main grid. Further, the aging of traditional transmission networks has le...
Conference Paper
A low-voltage direct current (LVDC) distribution system comprises a rectifier, a DC network, and customer-end inverters (CEI) responsible for the AC supply to the electricity end-users. The CEIs can be implemented as single-phase or three-phase ones; in this paper, feasible single-and three-phase topologies are introduced and their losses are calcu...
Conference Paper
Full-text available
In the time of increasing power capacity of a single wind turbine, the wind power converter is considered as the most failure-prone component. Since, the wind turbine faces randomly varying wind speed, special grid conditions and faults, a strong effort is required to achieve highly reliable performance of power electronics. In order to predict the...
Conference Paper
In this paper the implementation of the galvanic isolation in the low voltage direct current (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer located at the customer AC output of the customer-end inverter (CEI) or with an isolated DC-DC converter at the input DC network side of the CEI. However,...
Article
Analytical models are the key tools in the model-based control design of electric drives. The inductances together with the stator resistance are the fundamental parameters of these models. In this study three methods to determine the inductances of the decoupled d??q model of double-star permanent-magnet (PM) synchronous machines are studied. Thes...
Article
This paper proposes a decoupled d-q model of double-star interior-permanentmagnet (IPM) machines, whose stator consists of two three-phase winding sets displaced by an arbitrary angle. The model is based on the elaboration of the inductance parameters and is obtained by deriving a transformation that diagonalizes the original 6 × 6 stator inductanc...
Article
Accurate and updated knowledge of the electric machine parameters provides benefits in many applications, such as model-based control methods. This paper presents an online parameter estimation method for double-star interior permanent-magnet (IPM) machines supplied with voltage-source inverters (VSI). The estimation method is based on a decoupled...
Conference Paper
A method to detect phase-to-ground faults in a three-phase four wire networks is presented. Lately, the interest has grown towards the low voltage DC networks to be used as distribution networks or in-house networks. In these networks the protection against different faults must currently be realized using off-the-shelf components meant to be used...
Conference Paper
Full-text available
The thermal loading of power semiconductors is a crucial performance related to the reliability and cost of the wind power converter. However, the thermal loading impacts by the variation of wind speeds have not yet been clarified, especially when considering the aerodynamic behavior of the wind turbines. In this paper, the junction temperatures in...
Conference Paper
The paper studies the fundamental characteristics of commonly used DC network topologies. These network topologies include unipolar and bipolar structures. Paper also addresses important issues such as DC network modeling and voltage stability. The theoretical results achieved are verified using relevant simulation and measurement results.
Article
Full-text available
Dual three-phase electric machines have many advantages compared with conventional three-phase machines. However, the properties of such machines present challenges for current control that make it difficult to produce sufficient performance for the electric drive. This paper introduces an improved vector control scheme for dual three-phase permane...
Conference Paper
Experiences from the field setup of utility grid low voltage DC (LVDC) distribution are discussed. LVDC distribution being a novel approach to public electricity distribution, a research platform is realised to enable practical studies. The goal of the setup is to combine the requirements of the fully functional LVDC system and a flexible research...
Conference Paper
The Low voltage DC (LVDC) network is used as the last part of the public distribution networkpreceding the interface to end-users installations. One of the key components of the systemare the power electronic converters that are used to generate the customer-end AC voltage.The end-user load profile proposes a challenge for the converters as the eff...
Article
Full-text available
The short-circuit protection of a low-power converterfed low-voltage dc distribution network is investigated. In a public distribution network, the short-circuit protection is implemented by using fuses and circuit breakers, which may require a current that is over ten times the nominal currents of low-power dc/ac converter units to satisfy the rec...
Article
Full-text available
Observer-based output voltage control is proposed for single-phase full-bridge inverter, that is used to produce the voltage for a customer in a low-voltage direct current distribution network. To avoid difficulties to realize a feasible-output-voltage-tracking control for sinusoidal references, the control system is realized in a virtual dq-frame....
Conference Paper
This article focuses on the overall system engineering aspects of low voltage DC (LVDC) electricity distribution.. The interdependencies between different parts of an LVDC distribution system are discussed emphasising the issues related with the interconnection of user-end LVDC installations and public LVDC systems. The main objective is to illustr...
Conference Paper
A low-voltage distribution network today is based on three-phase AC system. In some cases, it can be replaced with an LVDC (Low-Voltage Direct Current) distribution network. Because the LVDC distribution technology requires practical studies, a real-network research platform has been introduced. The goal of the setup is to combine the requirements...
Conference Paper
Synchronous co-ordinate based Linear Quadratic Gaussian (LQG) phase voltage control is implemented. The regulation performance of the conventional LQG scheme is improved by using gain scheduling control that is based on the load current measurement. It is shown that the typical LQG scheme's performance can be improved remarkably by not only introdu...
Conference Paper
The tuning of the voltage regulation controller of the synchronous co-ordinate based Linear Quadratic Gaussian (LQG) phase voltage control for the single-phase customer-end converter in low-voltage direct current (LVDC) distribution network is carried out using internal model control (IMC) approach. The principle of the regulation controller can be...
Article
This paper considers stability issues in a low-voltage direct current (LVDC) electricity distribution network with a directional power flow. The network is based on power electronic devices, which bring a well-known instability factor, that is, negative impedance to the system. Each network inverter is designed to be stable when operating alone and...
Conference Paper
This paper describes a finite element (FE) based phase-variable model for double-star permanent magnet synchronous machines. In a double-star configuration where two three-phase windings are spatially shifted by 30 electrical degrees, a high amount of the 5th and 7th current harmonics may be excited because of the winding layout. However, a convent...
Conference Paper
Full-text available
This paper investigates a dual three-phase permanent magnet synchronous machine supplied by two independent three-phase voltage source inverters (VSIs). Dual three-phase machines have many important advantages compared with their conventional three-phase counterparts. Instead of six-phase converters and special vector controls, it would be a very i...
Conference Paper
Low-Voltage Direct Current (LVDC) distribution network is a novel approach to the LV distribution. The system greatly differs from the AC solutions used today and therefore, a laboratory platform of the LVDC distribution system has to be implemented. The system is designed to provide testing and measuring platform for the LVDC distribution technolo...
Article
Low-Voltage Direct Current (LVDC) distribution network is a novel approach to the LV distribution. The system greatly differs from the AC solutions used today and therefore, a laboratory platform of the LVDC distribution system has to be implemented. The system is designed to provide testing and measuring platform for the LVDC distribution technolo...
Conference Paper
Short-circuit protection devices applied to customer-end network protection today require multiple times the nominal current to operate within the required time limits. A three-phase 400 VAC distribution network supplies sufficient short-circuit current in customer-end faults, and reaching the required protection time poses no problems. When a Low-...
Conference Paper
Full-text available
Power electronic converters have growing importance in electricity distribution, generation, and in energy use. Therefore, it is relevant to study how the shorter lifetimes of power electronics compared to the traditional network components affect on the reliability of the electricity distribution and to its total costs. The main contribution of th...
Conference Paper
Full-text available
The low voltage DC (LVDC) distribution system is a concept of new DC based distribution system. Safety of new distribution system needs to be equal or higher than traditional AC distribution systems [1]. This paper presents protection scheme for an LVDC distribution system. The analysis approaches LVDC system as a whole - from beginning of the DC d...
Conference Paper
Full-text available
Capacitor voltage oriented PI control is implemented to control the phase voltage of a customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. Synchronous dq-frame is used to control the phase voltage to avoid the drawbacks of the PI control, such as possible steady-state error. In the paper the controller equations are d...
Article
Linear quadratic Gaussian (LQG) based phase voltage control is implemented. The regulation performance, estimation accuracy and interference sensitivity of different LQG control schemes is evaluated and compared. Paper reveals that it is possible to make the control system more insensitive to EMI when compared to dual-loop PI control and that the s...
Article
An LVDC (low voltage DC) distribution system is a promising technology to be used in future smart distribution system having high level cost-efficiency and reliability. Protection of an LVDC distribution system differs from the traditional 20/0.4 kV AC distribution network; direct current and IT network complicates the customer-end protection. This...
Conference Paper
Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that...
Conference Paper
A low-voltage distribution network and a part of the medium-voltage branch can be in some cases replaced with a low-voltage direct current (LVDC) network. The use of the higher DC voltage increases the transmission capacity compared with the AC system. The DC link supplies a DC/AC inverter, which is located by the customer. Because of the small nee...
Article
Passive filter topologies used at the output of the customer-end inverter in a low-voltage DC-distribution (LVDC) network are compared. The comparison of filter topologies is based on the requirements set for the voltage quality and issues such as the physical size of the filter, losses, the complexity of the needed control and the cost. It is conc...
Conference Paper
The leading themes in the distribution network development are the cost effectiveness and system reliability. Also the requirements for reducing pollution and increasing the service quality are issues, which have led to the introduction of SmartGrids network concepts. These network solutions are mostly dependent on power electronics, applied to con...
Article
Full-text available
An AC-based low-voltage distribution network can in some cases be replaced with a low-voltage direct current (LVDC) network. With a higher DC voltage, the transmission capacity increases compared with the AC system with the same cable cross-sectional area. The DC link feeds an inverter that converts the DC voltage to a 230 V single-phase or 400 V t...