Study on Operation and Control of Isolated Bidirectional DC-DC Converter with Cascaded Converters for Battery Energy Storage Systems

Before delving into this dissertation, I would like to share a few thoughts with you.As written on the cover page, this is a doctoral thesis about DC-DC power converters.If you are searching for research in this field, I am truly honored that this work might serve as a valuable reference for you.If your interests lie elsewhere, I am equally grateful that you have found your way to my research and are taking the time to read this foreword.I do not refer to any technical knowledge or specific expertise, but rather a mindset-a way of approaching life and thinking problems in this foreword.I hope this can really help you and be a reference to your work and life.First, embrace your present circumstances with a positive outlook, whatever the challenges you are facing.Perhaps, like me in 2024, you are overwhelmed by the demands of pursuing a degree.Maybe you are feeling dejected after a stern critique from your supervisors last week.You might be anxious about not getting your dream job offer or frustrated that the experimental setup you spent months designing has failed to work as expected.When these moments arise, set aside your work (unless tomorrow is the deadline!)and step out of your office or home.Spend an entire day breathing in fresh air and reconnecting with the world outside.Remember, as long as you keep moving forward, things will improve.Suffering is not a prerequisite for solving problems, but a good night's sleep often is.Additionally, cherish the people around you-your friends, family, and supervisors.Their contributions to your journey are not limited to material support; they enrich your heart and soul, shaping the unique individual you are today.Finally, do not take all the ideas presented in this thesis at face value.Even if you feel uncertain, approach everything with a critical mindset.I once published an article in one of the most esteemed journals in our field with an error in a formula, and the reviewers did not catch it.Regrettably, even after I discovered the mistake, I could no longer revise it.This serves as a reminder: you should never place blind trust in "authority," whether it is historical figures or your supervisors.It is up to you to discern what is right and wrong through your own reasoning.If you find yourself questioning a particular formula or explanation, trust yourself rather than what you see or hear.