Ariya Sangwongwanich

• PhD
• Professor (Assistant) at Aalborg University

System-level condition monitoring methods estimate the electrical parameters of multiple components in a converter to assess their health status. The estimation accuracy and variation can differ significantly across parameters. For instance, inductance estimations are generally more accurate and stable than inductor resistance in a buck converter....

The multiphase LLC converter is commonly used for high-power and high step-down applications. However, the tolerances in the tank circuit parameters cause uneven current sharing (CS), reducing system reliability. Additionally, phase-shedding (PS) can improve converter efficiency at partial load by turning-OFF phases. This paper proposes a multiphas...

Reliability of capacitors is a critical factor in ensuring the optimal performance of modular multilevel converters (MMC), which can be enhanced through health status monitoring and predictive maintenance. However, existing literature on MMC submodule capacitor condition monitoring primarily focuses on capacitance while overlooking the influences o...

Dual-active-bridge (DAB) converter with multilevel neutral-point-clamped (NPC) topology has shown potential to be a viable solution for medium-voltage DC (MVDC) systems. However, it will face a crucial challenge with regard to capacitor voltage balancing. In order to mitigate the negative effects caused by the voltage imbalance, e.g., overvoltage o...

The pulse current (PC) charging strategy is considered an effective charging strategy to prolong the lifetime of lithium-ion batteries (LIBs). However, the impact of pulsing current on the load dynamics of power converters and its resulting thermal stress in electric vehicles (EVs) has not been investigated in previous studies. This is an important...

The increasing demand for Lithium-ion batteries (LIBs) in electric vehicles (EVs) highlights the necessity for new efficient charging strategies to improve performance and extend battery lifetime. This paper investigates the effect of constant current (CC), constant power (CP), and five-stage constant current (5SCC) charging techniques on the LIB p...

Open-circuit fault (OCF) on power switches can cause a severe threat to operation and safety of power electronic converters. In the neutral-point-clamped (NPC)-based dual-active-bridge (DAB) converters, the OCFs will result in an increase in the current stress, DC bias, and capacitor voltage imbalance. In order to address these issues, the faulty s...

Multi-level dual-active-bridge (DAB) DC-DC converters offer higher voltage-blocking capability and larger stepup ratios, as well as increased number of degrees of freedom (DoFs) compared to the traditional two-level DAB converter. Thus, it has potential to be used in medium-voltage DC (MVDC) systems. However, the control complexity of the multi-lev...

Fast charging is a key challenge for the widespread adoption of electric vehicles (EVs), as it can make EVs more convenient and appealing to consumers. Therefore, different charging methods are proposed to enhance the performance of lithium-ion batteries (LIBs). Multi-stage constant current (MSCC) charging can improve LIB's performance in several a...

Power electronics and battery energy storage are the key enabling technologies for high-efficiency energy conversions to realize green transition. With an increasing demand for electrification, renewable energy integration, and energy saving, more and more power electronics and batteries are being utilized. Consequently, their impact on the environ...

This article proposes a new dipolar pulse width modulation (PWM) algorithm for direct power control of each dc source of a dual-input three-level inverter. This capability, which is required for dual maximum power point tracking (MPPT) in photovoltaic (PV) applications and power distribution control of mixed or hybrid dc-sources, cannot be achieved...

Grid-connected rooftop photovoltaic (PV) systems are a promising solution to reduce electricity bills and support sustainable development in residential areas. Although excess PV power can be sold to the grid at attractive tariffs, premium feed - in tariffs have been discouraged in many countries. Instead, self-consumption policies have been encour...

Various methods have been proposed to reduce the charging time of lithium-ion batteries (LIBs). The multi-stage constant current (MSCC) charging technique has gained significant attention as a potential solution among various proposed methods. A study was conducted to investigate the impact of the MSCC charging technique on LIBs. Specifically, this...

Grid-connected inverter failure may be caused by outliers of a population of units in field operation, due to the LCL filter parameter uncertainty. This article proposes a probabilistic framework to analyze the impact of multiple filter parameter variances due to component tolerances, operating points, and aging effects. Both robust stability and...

The multi-stage constant current (MSCC) charging strategy is intended to enhance the performance of lithium-ion batteries (LIBs). Therefore, this paper investigates the MSCC charging effect on LIB's performance parameters, including charging time, charged/discharged capacity, charging energy efficiency, and maximum/average temperature rise. A 2.6 A...

To reduce the carbon footprint in the transportation sector and improve overall vehicle efficiency, a large number of electric vehicles are being manufactured. This is due to the fact that environmental concerns and the depletion of fossil fuels have become significant global problems. Lithium-ion batteries (LIBs) have been distinguished themselves...

This paper proposes a unified solution for single or multiple sensor faults in the cascaded H-bridge multilevel converters (CHBMCs), including the identification of fault location and fault types, and resilient control. The original states and sensor fault information are decoupled completely and estimated simultaneously by a reduced-order observer...

Two-three (2/3)-level dual-active-bridge (DAB) DC-DC converter has high potential to become a promising solution for medium-voltage high-power applications. However, its switching characteristics, modeling, and optimal modulation schemes have not been comprehensively explored yet. In order to avoid voltage and current distortions, and ensure reliab...

In this paper, a new two-stage global maximum power point tracking (GMPPT) algorithm based on artificial neural network (ANN) is proposed. The novel ANN architecture is presented first, which requires fewer sampling points than other ANN-based GMPPT approaches, thereby reducing both the tracking time and power loss involved in the tracking. In addi...

Hybrid converters with multiports (simultaneous DC and AC outputs) are promising solutions to reduce conversion stages from solar energy to various loads, and thereby increasing the utilization of residential PV systems. Considering common-mode noises suppression and high reliability, this paper proposes a fully symmetrical hybrid PV converter conc...

This paper proposes a self-data-driven method for remaining useful life prediction of PV arrays based on selfcondition monitoring data considering the uncertainty and volatility. First, a health indicator (HI) reconstruction method is presented to eliminate the uncertainty and volatility of condition monitoring data. Second, a nonlinear Gamma stoch...

Power electronics have been and will continue to be an enabling technology for energy production, storage, transmission, distribution, and consumption. Power electronic converters are usually the critical links in electrical energy systems, affecting system security, safety, energy efficiency, and cost-of-ownership. As a result, the reliability req...

To ensure optimal and economical battery operation, it is necessary to consider its lifetime-limiting aspects, e.g., performance degradation and degradation costs. Battery performance degradation is commonly assessed by offline lifetime models. They are suitable for battery planning and performance monitoring, but cannot be used in real-time operat...

1500-V photovoltaic (PV) configuration is the standard design in the solar PV industry. Extending the maximum dc voltage from 1000 to 1500 V can reduce the installation cost of the entire power plant. However, it may affect the reliability of the corresponding 1500-V PV inverters, due to the increased loading stresses, i.e., voltage stress and ther...

This paper provides a comparative study of the battery energy storage system (BESS) reliability considering the wear-out and random failure mechanisms in the power electronic converter long with the calendar and cycling aging of the batteries. Three typical stationary applications were considered: frequency containment reserve (FCR), increased self...

Microgrids are highlighted as the technology which can help in providing sustainable and efficient electrical energy solutions. They employ distributed energy resources to efficiently supply local load and increase the reliability of the local network. Design and planning are of a pivotal importance in yielding all of the advantages this concept ca...

Partial shading is one of the biggest challenges in the optimum utilization of photovoltaic (PV) panels. Occurrence of shade on the front side of a panel affects the light transmission completely or partially, leading to its production loss. Hence, in this article, to improve the electrical performance of the partially shaded solar panel, a physica...

The storage of enormous energies is a significant challenge for electrical generation. Researchers have studied energy storage methods and increased efficiency for many years. In recent years, researchers have been exploring new materials and techniques to store more significant amounts of energy more efficiently. In particular, renewable energy so...

Capacitor voltage balancing is a critical issue for neutral-point-clamped (NPC)-based converters, including the two-three (2/3)-level dual-active-bridge (DAB) DC-DC converters. The unbalanced capacitor voltage will increase the voltage stress on power devices and negatively affect the reliability of the converters. Two typical problems during the c...

The installations of the residential photovoltaic (PV) systems with integrated battery energy storage are strongly dependent on their economic profitability. The Net Present Value (NPV), which is a metric to evaluate the cost-effectiveness of PV-battery systems, can be strongly influenced by the replacement cost. Thus, the lifetime of the reliabili...

Capacitor voltage balancing is of importance in the neutral-point-clamped (NPC)-based dual-active-bridge (DAB) converters. Most of traditional voltage balancing methods adopt the transformer current models in the balancing process, as the direction of the neutral-point current is affected by the transformer current polarity. However, this approach...

Two-three (2/3)-level dual-active-bridge (DAB) converter is a promising DC-DC converter for medium and high voltage applications. That is due to its advantages like high power density, galvanic isolation, and capability of withstanding higher voltage ratings compared to the two-level DAB converters. However, the open-circuit fault (OCF) is critical...

Flexible active power control (FAPC) is becoming mandatory for PV systems, which is to limit/reserve the PV power below certain constraints as commanded, including the power ramp-rate control (PRRC), power limiting control (PLC), and power reserve control (PRC). In practice, energy storage such as batteries can be adopted to reduce the PV energy di...

Transformer-less multilevel inverters based on switched capacitors are gaining importance due to the voltage boosting ability from a single input DC source and inherent capacitor voltage balancing capability. Most of the grid-connected transformer-less inverters are 5-level and are commonly grounded so that their leakage current is zero. However, s...

To enhance the power quality and stability of photovoltaic (PV) systems, energy storage elements such as batteries can be included. Among various structures of PV-battery-hybrid (PVBH) systems, the series configuration attracts much popularity. However, certain operating conditions have not previously been considered for the series PVBH system. For...

Transformerless single-phase inverters are preferring in residential grid-connected PV systems when compared to galvanic-isolated ones (i.e., transformer-based inverters). In addition to the special leakage current issue, high efficiency, power quality and reactive power injection are of concern that should be considered in grid-connected applicati...

Monte Carlo (MC) simulation has been widely used for reliability assessment of power electronic systems. In this approach, multiple simulations are carried out during the lifetime estimation of the components in power converter, where the parameter variations are considered. In the previous mission-profile based reliability assessment methods, the...

This paper investigates the potential to enhance the reliability of 1500-V single-stage photovoltaic (PV) inverters with a junction temperature control strategy, where PV inverters can operate either in the maximum power point tracking mode or a junction temperature limit control mode depending on the thermal stress on the inverter power devices. W...

The need for energy storage devices especially in renewable energy applications has increased the use of supercapacitors. Accordingly, several supercapacitor models have been proposed in previous researches. Nevertheless, most of them require an intensive test to obtain the model parameters. These may not be suitable for an initial simulation study...

If we look at the history of renewable energy sources (RESs), how it all began, and how rapidly they continue to develop, it can be argued that one of the main reasons is due to the rapid improvements in power electronics technology in interfacing the renewable source to the grid [...]

The series photovoltaic-battery-hybrid (PVBH) system is considered as a promising solution to better integrating distributed energy sources. However, the state-of-the-art controls are either highly dependent on the communication, by which real-time control variables should be transmitted among all converters, or only suitable for PVBH systems with...

Energy storage systems (ESS) are being considered to overcome issues in modern grids, caused by increasing penetration of renewable generation. Nevertheless, integration of ESS should also be supplemented with an optimal energy management framework to ensure maximum benefits from ESS. Conventional energy management of battery, used with PV system,...

An increasing penetration level of photovoltaic (PV) systems demands a more advanced control functionality. Flexible power control strategy such as constant power generation (CPG) control has been introduced in the recent grid regulations to mitigate challenging issues such as overloading, intermittency power generation/fluctuation, and frequency r...

Journal link: https://www.scienceliterature.com/index.php/tjom/article/view/10-24 Abstract: Energy storage is a big problem today in the world for humanity depend on the challenges of conventional storage devices. So the researchers are studying to invent new energy storage devices and materials for many years. The supercapacitor (SC) is invented a...

Monte Carlo simulations have been widely used in the reliability assessment of power electronics systems. However, the conventional Monte Carlo simulation method is not directly suitable to be applied to the system with fault-tolerant operation, where the accumulated damage during the pre-fault operation needs to be taken into account as an initial...

In mission-profile based reliability assessments, it is a common method to calculate the static parameters that represent the thermal stress of power electronic converters. These parameters are afterwards used in Monte Carlo (MC) simulations for estimating the expected lifetime of the components in power converters taking into account variations. H...

The PV inverter lifetime is affected by mission profiles, which include the solar irradiance and ambient temperature of the installation site. In many investigations, the design for reliability approach (DFR) is used to evaluate the reliability of the PV inverter, where the solar irradiances are measured on a certain tilt and orientation angle. In...

The still increasing penetration of power electronics into the modern power systems challenges the entire system stability, which requires more advanced control strategies to address the issues. One of the challenges is the variability of renewable energies, including photovoltaic (PV) systems, which are generally operating with uncertainty and int...

Increasing integration of photovoltaic (PV) system in electric grids cause congestion during peak power feed-in. Battery storage in PV systems increases self-consumption, for consumer's benefit. However with conventional maximising self consumption (MSC) control for battery scheduling, the issue of grid congestion is not addressed. The batteries te...

The dc-link capacitor is considered as a weak component in Photovoltaic (PV) inverter systems and its reliability needs to be evaluated and tested during the product development. Conventional reliability testing methods for capacitors are typically carried out under constant loading conditions, which do not reflect the real operating conditions (e....

Bifacial PV panels are emerging technologies that can increase the energy yield of the footprint in PV systems and thereby potentially reduce the cost of energy compared to the conventional monofacial PV panels. However, the increased energy yield due to the capability of harvesting the solar energy from both front and rare surfaces of the panel ca...

Power devices are among the reliability-critical components in the Photovoltaic (PV) inverter, whose failures are normally related to the thermal stress. Therefore, thermal modeling is required for estimating the thermal stress of the power devices under long-term operating conditions of the PV inverter, i.e., mission profile. Unfortunately, most o...