对新能源电力系统中的宽频振荡机理及其抑制技术进行了探讨。基于阻抗模型分析了交流电网谐振稳定性所处的两难困境，论证了宽频振荡的“负电阻”机理不能成立。提出了用宽频带电压源换流器模型和宽频带电流源换流器模型来描述电力电子装置的通用方法，从而将电力电子装置的非线性特性用谐波电压源和谐波电流源来表示；使得新能源电力系统仍然可以用线性系统来描述，并将宽频振荡的机理解释为由网络谐振引起的“谐波放大”现象，从而建立了新能源电力系统宽频振荡机理解释的一个新框架。通过对两种基本谐振电路的分析，导出了谐振模态阻尼比与谐波放大倍数之间的关系，为基于s域节点导纳矩阵法和C型阻尼滤波器分析与抑制宽频振荡奠定了理论基础。基于最大阻尼准则提出了C型阻尼滤波器的一种设计方法，所设计的C型阻尼滤波器具有很强的宽频带阻尼作用。

The mechanisms of broadband oscillations in renewable energy power systems and their suppression technologies are discussed. Starting from the dilemma faced in analyzing AC grid resonance stability based on impedance models, it is demonstrated that the "negative resistance" mechanism of broadband oscillations is untenable. A general method is proposed to describe power electronic devices using broadband voltage source converter models and broadband current source converter models, thereby representing the nonlinear characteristics of power electronic devices with harmonic voltage sources and harmonic current sources. This enables renewable energy power systems to still be described as linear systems, and interprets the mechanism of broadband oscillations as a "harmonic amplification" phenomenon caused by network resonance, thus establishing a new framework for explaining the mechanisms of broadband oscillations in renewable energy power systems. Through analysis of two basic resonant circuits, the relationship between resonant mode damping ratio and harmonic amplification factor is derived, laying the theoretical foundation for analyzing and suppressing broadband oscillations based on the s-domain nodal admittance matrix method and C-type damping filters. Based on the maximum damping criterion, a design method for C-type damping filters is proposed, and the designed C-type damping filters exhibit strong broadband damping effects.