Oscillatory Stability of Converter-Dominated Power Systems

Inhaltsverzeichnis

1. Frontmatter

2. Terms, Definitions, and Classifications of Power System Oscillatory Stability

   1. Frontmatter

   2. Chapter 1. Introduction to Power System Oscillatory Stability

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter first presents a summary of six real-world wideband oscillation events and the resulting consequences. The chapter highlights the pressing need for fully understanding the wideband control interactions as well as addressing the outstanding challenges to accurately model and analyze the system and deploy effective control measures.

   3. Chapter 2. Terms, Classifications, and Mechanisms of Wideband Oscillations

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter provides a deeper understanding of wideband oscillations (WBOs) from the system-level stability perspective. The terms, classifications, and basic occurrence mechanisms of the WBO are discussed. Further, the chapter presents a mechanism-based classification of power system stability and proposes new terms and definitions of WBOs.

3. Modeling and Analysis Methods with Real-World Use Cases

   1. Frontmatter

   2. Chapter 3. Modeling Methods

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter first gives an overview and classification of the modeling methods for oscillatory stability of converter-dominated power systems. Next, a general philosophy of frequency domain impedance modeling of different types of power system components is discussed. Then, the impedance modeling of different converter-based devices is elaborated with and without considering the operating point dependency. Finally, a brief discussion of the time-domain modeling methods is presented.

   3. Chapter 4. Analysis Methods

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter first presents the objectives of oscillatory stability and the classification of the analysis methods in the time and frequency domains is presented. The chapter focuses on common frequency-domain impedance-based analysis methods are discussed, including the source-load impedance-based Nyquist criterion, frequency domain modal analysis, and aggregated impedance network model. Next, the time-domain eigenvalue and EMT-simulation analysis methods are discussed briefly. Finally, critical insights into the strengths and limitations of different oscillatory stability analysis methods are presented.

   4. Chapter 5. Application Case: Oscillatory Stability Analysis of Type-4 Wind Power System

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter presents the time/frequency-domain modeling and stability analysis of sub/supersynchronous oscillation (S2SO) events in the Hami wind power system in Western China as an application case. The oscillatory stability analysis is carried out using the impedance network modeling-based quantitative analysis, frequency domain modal analysis, and RLC equivalent circuit-based analysis. Furthermore, a stability region analysis is performed to construct a stability region separating the operating points leading to a stable or unstable system. Finally, the source of the oscillation is also identified using field-measured data.

4. Control Methods with Real-World Implementations

   1. Frontmatter

   2. Chapter 6. Mitigation of Wideband Oscillation

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter first outlines countermeasures to the wideband oscillations (WBOs) in converter-dominated power systems at the planning and design, operational scheduling, damping control, and emergency protection stages. The design principles and implementation methods of new-type power system stabilizers (NPSS) for converter-based devices to mitigate the WBOs are presented, including the principles of their offline and online tuning. Finally, the chapter discusses the application of different types of NPSSs in existing converter-based devices as well as the development of shunt converters specially designed to suppress the WBOs.

   3. Chapter 7. Application Case: Mitigation of SSO in Type 3 Wind Power Systems

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter presents an application case of practical oscillation damping control techniques implemented on a real-world wind power system facing subsynchronous oscillation (SSO). First, the real-world SSO events in the Guyuan wind power systems are discussed. Then, the generator and grid side damping controls are designed, developed, and tested through controller hardware in the loop simulations. The generator- and grid-side subsynchronous damping controls have been put into service in the actual wind power system facing the SSO.

   4. Chapter 8. Application Case: Mitigation of HFR in MMC-HVDC System

      Xiaorong Xie, Jan Shair

      Abstract

      This chapter demonstrates the mitigation of high-frequency resonance/oscillation (HFR/HFO) events in an actual modular multilevel converter (MMC)-based high-voltage DC (HVDC) system using adaptive notch filters. The EMT software simulations verify that the adaptive notch filter with adaptive online measurement of oscillation frequency can suppress the HFO effectively. The results are verified through EMT software simulations and analytically derived impedance-based analysis.