Since the first publication about 15 vears ago,the immittance-based frequency-domain stability modeling andanalysis methods have served as the foundation for small-signal stability study of power electronics in ac powersystems. Stability problems addressed by the methods are assumed to occur at the grid interface ofindividuaconverters. The converter-grid system model used by the methods resembles a single-input-single-outputSISO) feedback loop, and stability is assessed by applying the Nyquist criterion to the loop gain. Throughaggregation, the methods can also be applied to clusters of converters sharing a common point ofinterconnectiorwith the grid, such as in the case ofwind and PV farms. The methods have enabled the analysis and mitigatiorof different practical grid integration problems in renewable energy and high-voltage dc (HVDC) transmissionsystems, including subsynchronous and supersynchronous resonance involving winc and solar power generatiorolants connected to different types of grids (weak grid, series-compensated grid, or offshore grid with HVDCconnection to onshore network), as well as high-frequency resonance involving HVDC converters.

The development of renewable energy in recent years has been driven by the need to decarbonize the electricitygrids as the first step towards net-zero emission and carbon-neutra economvthat many countries and regionstarget to achieve between 2050 and 2060. The massive deployment of converter-based generation togetherwith increasing use of converter-based transmission, distribution, and consumption is fundamentally changingthe characteristics ofthe grid. With the ubiquitous presence of converters,their impact on overall power systemstability has become a major concern for grid operators. Stability analysis based on SISO system modelsaddresses stability of individual converters with the grid and does not consider the complex behavior ofconverter-based power systems due to interactions and coupling among different converters. To address thisnew chalenge, generalized immittance-based stability criteria based on multiple-input-multiple-outout (MIMOsystem models have been developed for power electronics in future decarbonized grids and are presented irthis tutorial.

The tutorial is organized as follows: After a brief review ofthe general smal-signal sequence immittance theorymodeling of converters as two-port networks is presented to include coupling between ac and dc ports as weas over frequency. The two-port converter models are then used to develop frequency-domain models in MIMOform with guaranteed open-loop stability for power systems with any number of converters, consideringdifferent types ofgrids (ac, dc, hybrid ac-dc) and including both grid-following and grid-forming converters aswell as conventional generators. Frequency-domain stability analysis of MIMO models by the generalizedNyquist criterion is then explained along with frequency-domain modal analysis technigues to identify thesource ofinstability problems in a complex network. The tutorial concludes with several examples ofapplicationin practical power systems.

Date: June 22,2025

Time: 09:00-12:00 AM

Venue: 1F / YanLan Ballroom A

Recently, power-electronics converters have gained popularity across various industries due to their enhancedpower density and capacity. This has led to the development of increasingly complex mission profiles. Ensuringthe safety and reliability of these converters necessitates the implementation of comprehensive testing andevaluation methodologies for power electronics components and systems prior to their deployment. Howeverconventional testing methods often yield loading, behaviors that significantly deviate from those observed inpractical applications, thereby compromising the ability to accurately reflect component and system failuresunder actual mission profiles. In light ofthese limitations, a more advanced testing and evaluation methodology.namely mission-profile-based testing and evaluation method for power electronics components/systems, hasemerged. This approach diverges from conventional testing methods by incorporating real-field loadingbehaviors of power electronics components and systems.

However, the incorporation of actual mission protiles introduces novel challenges for mission-profile-basedtesting and evaluation methods. These challenges encompass the extraction of characteristic parameters undermission profiles, the thermal modeling of power electronics devices suitable for diverse mission profiles, andthe recreation of real-field loading behaviors and control behaviors of power electronics components andsystems. This tutorial aims to provide updates on the challenges of mission-profile-based testing and evaluationmethods for reliability of power electronics, Feasible solutions for these challenges, including a more advancedthermal characterization method of power semiconductor devices based on an H-bridge testing circuit, afrequency-domain thermal model, and control algorithms specified for mission profile emulation, will beprovided in order to obtain a trustworthy testing and evaluation result.

Date: June 22,2025

Time: 09:00-12:00 AM

Venue: 1F / YanLan Ballroom B

In this tutorial, we will walk through the current technological challenges for digital and intelligent grid-integration of solar PV energy and look at different solutions. This tutorial is organized into three parts: I - Solar PV Energy Conversion and Power Electronics Technologies, II - Advanced and Intelligent Control for Large-Scale PV Systems, and III - Digitalization and High-fidelity Simulation of Massive Power Electronics Systems, covering the basics of solar PV energy conversion, advanced and RMIT Classification: Trusted intelligent control, and simulation technologies. The goal of this tutorial is to improve the functionality and manageability of grid-connected PV systems by advanced and intelligent controls and to achieve efficient and effective testing of algorithms for large-scale power electronics. As such, it is to ensure the sustainability, compatibility with the power grid, efficiency, and reliability of PV systems that adhere to grid regulations and help to reduce the LCoE for further integration. The tutorial is organized for intermediate and advanced audiences, engineers, and researchers seeking practical solutions towards intelligence and digitalization in solar PV power systems. The prerequisite is basic power electronics and control.

Date: June 22,2025

Time: 09:00-12:00 AM

Venue: 2F / DaGuan Conference Room A

As an enabling technology, power electronics is entering into all kind of energy processing systems and becomes fundamental to facilitate power conversions. A key issue for power electronic converters is the ability to tackle periodic signals, such as sinusoidal voltage/current regulation, power harmonics mitigation, synchronous frame transformation, grid synchronization, torque ripple suppression, wide-frequency oscillation suppression, and so on, for distributed generation and microgrid applications in such a way to precisely and flexibly convert and regulate electrical power.
nnected to different types of grids (weak grid, series-compensated grid, or offshore grid with HVDCconnection to onshore network), as well as high-frequency resonance involving HVDC converters.

A model is a precise representation of a system’s dynamics, which allows us to reason about a system and make predictions about how a system will behave. For a control system, a system model contains at least two essential parts - the plant model inside the feedback control loop and the reference/disturbance model outside the feedback control loop. The plant model based control, e.g. internal model control, deadbeat control, model predictive control, etc. is normally responsible for adjusting the transient response and robust stability; according to the internal model principle (IMP), the periodic reference/disturbance model based control, e.g. Integral control, resonant control, repetitive control, etc., can ensure zero-error compensation of periodic signals, e.g. dc signals, sinusoidal signals and cyclic signals. A composite control, such as the most popular PID control, might take advantages of all composited controllers to achieve complementary good performance ‒ fast, accurate, and robust regulation. However, in absence of knowledge of the plant model, a PID controller does not guarantee optimal control performance and system stability in the zero-error compensation of dc signals. Moreover, it is time- consuming to tune the PID controller via trail and error. Therefore, a complete system model based (SMB) optimal composite control strategy, which aims to takes full advantage of useful knowledge of the system mode to optimize control performance and robust stability, is proposed for power converters to achieve accurate, fast and robust regulation of reference output voltage/current and perfect rejection of disturbances.

This seminar is to lay a foundation of the system model based optimal composite control theory with basic theory, derivation of applied equations, knowhow on the control synthesis, and some most recent progress, which is found to provide power electronic converters with a superior control solution to the compensation of periodic signals with high accuracy, fast dynamic response, good robustness, and cost-effective implementation. This tutorial also contributes to this discipline combined with demonstrative application examples of the of SMB controller for power converters, which can be fruitful in future controller designs, and several cutting-edge application scenarios ‒ e.g. wide-frequency oscillation suppression, ultra-low harmonic PV inverter, and etc. As an emerging topic, the SMB control has the great potential to be one of the best control solutions for power converters but not limited to, and to be a very popular standard industrial controller like the PID control.

Date: June 22,2025

Time: 09:00-12:00 AM

Venue: 2F / DaGuan Conference Room B

The large-scale integration of converter-based resources, dc transmission systems, and loads bring new challenges to power system stability. Grid-forming (GFM) converters recently emerge as an enabling solution for addressing the stability challenges. However, the control dynamics of GFM converters, especially those related to power synchronization and dc-link voltage regulation, can still result in low-frequency resonances. Understanding the causes of these issues and developing effective damping controls are essential to fully realizing the potential of GFM technology in future power systems.

This tutorial provides a comprehensive exploration of principles, challenges, and damping control strategies for the resonances with GFM converters. It begins with the fundamentals of GFM principles, control methods, and the latest grid-forming capability requirements. Next, it offers a detailed analysis of the small-signal dynamics of GFM converters, providing clear physical insights into the causes of resonances under constant dc-link voltage conditions. Damping solutions, such as virtual impedance control, are also discussed, along with their impact on the reactive current response. Finally, the tutorial addresses the complexities of GFM converters with regulated dc-link voltage, covering small-signal modeling, controller design, and the analysis of torsional oscillations in GFM wind turbines. By combining theoretical insights with practical examples, this tutorial aims to equip participants with the knowledge and tools needed to design and optimize GFM converters for improved stability and performance in modern power systems.

Date: June 22,2025

Time: 14:00-17:00 PM

Venue: 1F / YanLan Ballroom A

Today, one of the most distinct feature towards carbon neutrality is the rapid power electronics penetration in the generation, transmission and distribution of modern grid. Driven by the surging capacity on renewable energy, energy storage and hydrogen production, medium voltage (MV) power electronics are playing growing roles in the power conversion, interconnection and protection. On the other hand, booming electricity demand from high-energy-consuming load such as datacenters arouse for a highly efficient and flexible interface to the MV grid. Meanwhile, amid the electrification of industrial and transportation sector, growing applications such as extreme fast charging of electric vehicles (EVs) and more-electrical aircraft raises the demand for more compact and efficient energy hub.
Above all calls for an urgent development on medium voltage power electronics, which have already grown exponentially for the last decade from a very low level, and now at the critical point of eruption. Driven by the burgeoning demand, the MV Silicon Carbide (SiC) devices draw extensive attention and are widely deemed next generation’s foundation for the MV power electronics.
On that basis, this tutorial will elaborate on the reliability, application of MV SiC devices and their impact on modern grid. The discussion begins with the context how MV SiC devices manage the transition to a more-power-electronics grid. Special attention is given to the devices rated above 10 kV to highlight the foreseeable scenarios and advantages, followed by the latest study on the reliability and evaluation method of MV SiC devices. Next, robust yet smart gate drivers are presented on fulfilling low-loss switching, EMI immunity and protection upon ultrahigh switching speed. Further, to fully unleash the potential of MV SiC devices, passive components including medium-frequency transformers, high-capacitance film capacitors and even insulation coordination systems are concluded as the major contributors, and their design rules are highlighted. Finally, examples such as Solid-State Transformer (SST), dc transformer and grid-tied converters are given to demonstrate how proper utilization of the MV SiC can help achieve a superior resilience and affordability of power grid, beyond efficiency and power density.
Date: June 22,2025

Time: 14:00-17:00 PM

Venue: 1F / YanLan Ballroom B

Part I of the tutorial delves into heterogeneous integration methods and implementation techniques for high-frequency transformers, specifically designed to meet ultra-low voltage and ultra-high current XPU power supply requirements. The stringent demands for efficiency and power density in these supplies pose significant challenges in designing high-ratio, low-voltage, high-current transformers. Although magnetic integration technology can enhance transformer performance, it does not fully address XPU power supply needs. This section comprehensively examines the circuit structures of high-ratio high-frequency transformers using hybrid circuit integration, winding integration methods that employ cancellation techniques for high currents, and the principles and implementation strategies for integrating magnetic cores, windings, and switching networks. An example demonstrating the practical application of these methods will be presented, featuring a high-frequency transformer with a 0.8V / 450A output and a power density of 1A/mm².
Part II shifts focus to resonant switched capacitor circuits tailored for high power density XPU power supplies. Given their superior energy density compared to magnetic components, capacitors have become a preferred choice for such applications. However, issues like charging and switching losses hinder efficiency improvements. This part explores how adding an inductor to form either hybrid or resonant switched capacitor circuits can overcome these limitations. It introduces the fundamental principles of resonant switched capacitor circuits and analyzes a two-stage cascaded method. Additionally, it outlines a voltage gain adjustment technique to enable closed-loop control in resonant switched capacitor circuits.
Part III offers an in-depth technical overview of trans-inductor voltage regulator (TLVR) converters used in data center point-of-load applications. A multi-phase series capacitor TLVR is introduced, utilizing constant on-time control for data center applications. This structure effectively halves switch voltage stress by splitting the input voltage among Buck cells, doubling both the step-down ratio and duty cycle. With indirectly coupled output inductors and low equivalent transient inductance, this design achieves ultra-fast dynamic responses. A prototype delivering 24V to 1.2VA demonstrates peak efficiency of 91.1% and exceptional dynamic performance under extreme conditions. Comprehensive small-signal modeling using the describing function method accurately predicts its behavior, validated through SIMPLIS simulations and experiments, offering valuable insights for optimal controller design across various scenarios.

Date: June 22,2025

Time: 14:00-17:00 AM

Venue: 1F / DaGuan Conference Room A

The increasing penetration of inverted based resources (IBRs) and the retirement of synchronous generators (SGs) are leading to rapid transformations in global power systems. As power electronics converters are widely applied across power generation, transmission, and distribution, power systems face unprecedented stability challenges. This tutorial aims at introducing the power electronics converter driven stability issues through developing effective analysis methods to facilitate system stability demonstration and designing advanced control methods of power converters for stability enhancement. Both small-signal and large-signal stability of power electronics defined power systems will be covered.

This tutorial will firstly cover the impedance based small-signal stability analysis methodologies for power electronics defined power systems, including system modelling, stability assessment and stability-oriented control design. Different approaches to stability analysis such as Nyquist plot, Bode plot, will be explored. The concept of settling angle and the settling angle based stability criterion will be introduced to facilitate stability analysis of wide-area multi-converter systems, providing insights about instability mode identification and participation factor analysis for both single-bus and multi-bus systems. A case study based on the real-world Australian West Murray Zone oscillation events will be provided as an example of the stability analysis in a power electronics defined power system. Grid-forming (GFM) converters are promising solutions to enhance system stiffness during the transition towards weak grid, while the limited overcurrent capability and power capacity of GFM converters introduce the large-signal synchronisation stability challenges. The current limiting schemes will be introduced and compared in terms of their impacts on system synchronisation stability. Novel synchronisation control structures will be introduced to extend the functionalities of the conventional power-synchronisation loop in GFM converters, realising more responsible GFM design by coordinating physical limitations with grid support functionalities during contingencies. The stability analysis methodologies and stability-oriented control design are critical for ensuring the safe, reliable and stable operation of power-electronics defined power systems and further increasing the hosting capacity of IBRs towards the net zero targets.

Date: June 22,2025

Time: 14:00-17:00 PM

Venue: 1F / DaGuan Conference Room B