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发明公开
CN110807168A 一种估算并网变换器次同步振荡模态的方法及装置 有权

一种估算并网变换器次同步振荡模态的方法及装置
摘要：
本发明公开了一种估算并网变换器次同步振荡模态的方法及装置，该方法包括步骤：获取VSC的控制参数和系统的工作点，建立VSC的等效运动方程模型；等效运动方程模型的表达式为响应系统的振荡频率，得到VSC的等效刚度系数为KVSC(jωd)，KVSC(jωd)＝ke(ωd)+jωdde(ωd)，根据VSC的等效运动方程模型，则有MVSC(jωd)＝MVSC(ωd)和DVSC(jωd)＝DVSC(ωd)；根据VSC输入的有功功率的变化值，得到[KVSC(jωd)+Km(jωd)]Δθdec＝ΔPin；将Km(jωd)写成Km(jωd)＝km(ωd)+jωddm(ωd)形式，根据km(ωd)+ke(ωd)＝0，得到次同步振荡模态的振荡频率；根据振荡频率得到阻尼比，以根据阻尼比采取相应的抑制次同步振荡措施。本发明能估算VSC的次同步振荡模态，普适性强。
摘要（英）：

The invention discloses a method and device for estimating a subsynchronous oscillation mode of a grid-connected converter, and the method comprises the steps: obtaining a control parameter of a VSC and a working point of a system, and building an equivalent motion equation model of the VSC, wherein the expression of the equivalent motion equation model is the oscillation frequency of the responsesystem, the equivalent stiffness coefficient of the VSC is KVSC (j omega d), KVSC (j omega d) = ke (omega d) + j omega dde (omega d), and according to an equivalent motion equation model of the VSC,MVSC (j omega d) = MVSC (omega d) and DVSC (j omega d) = DVSC (omega d); obtaining [KVSC (j omega d) + Km (j omega d)] delta theta dec = delta Pin according to the change value of the active power input by the VSC; writing the Km (j omega d) into the form of Km (j omega d) = km (omega d) + j omega dm (omega d), and obtaining the oscillation frequency of the subsynchronous oscillation mode according to the formula that km (omega d) + ke (omega d) = 0; and obtaining a damping ratio according to the oscillation frequency so as to take corresponding measures for suppressing subsynchronous oscillation according to the damping ratio. According to the method, the subsynchronous oscillation mode of the VSC can be estimated, and the universality is high.

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