S - subsynchronous 中文 - EN166

subsynchronous adj.【電學】次同步的，亞同步的。

subsystem
The characteristics of damping shows that the uncompensated parallel ac transmission line can release the coupling between the hvdc and generator and improve the damping of the system , hence the possibility of subsynchronous oscillation decrease . in such a system scheme , the hvdc system dominates the changes of damping due to the small magnitude of the damping provided by ac line . when the ac transmission line is compensated with a fixed series capacitor , the situation will be totally different 其中，并列運行的無串補交流輸電線路可以緩解hvdc與其臨近機組之間的機電耦合程度，改善hvdc的電氣負阻尼特性，從浙江大學博士學位論文摘要而減輕機組發生次同步振蕩的危險性，此時系統的整體電氣阻尼特性由hvdc的性質決定;但若交流線路中存在串聯補償電容，則系統幅值較大的電氣負阻尼不僅可能使整流站機組發生次同步振蕩，逆變站附近機組同樣存在發生次同步振蕩的可能性，此時系統的整體阻尼特性由串聯補償電容的性質決定。
The electrical damping within the whole subsynchronous frequency range is calculated . the impacts of the unit interaction factor between hvdc and turbine generator , the dc power level , the firing delay angle and the parameter settings of hvdc controller on the have the potential danger of subsynchronous oscillation 在整個次同步頻率范圍內，計算得到了系統電氣阻尼，并詳盡地分析了同步發電機與hvdc的耦合程度、直流輸送功率水平，換流閥觸發角大小以及控制器參數等因素對系統電氣阻尼的影響。
All these changes , which are of importance to subsynchronous oscillation analysis , cannot be described with the quasi steady state ( qss ) model any more . therefore , the deficiency of qss - model - based eigenvalue method is pointed out and a novel method named complex torque coefficient - test signal method is adopted to analyze the subsynchronous oscillation caused by hvdc or facts devices 基于此，指出了采用準穩態模型進行hvdc系統次同步振蕩分析的局限性，并引入了分析hvdc或含有facts裝置的系統次同步振蕩問題的方法：復轉矩系數- - - -測試信號法。
This paper also studies an hvdc system based on leee fbm , a svc system based on ieee fbm and a statcom system based on ieee fbm . it proves the function of supplementare subsynchronous damping controller ( ssdc ) in the above devices to mitigate ssr . it also analyzes the influence of input signal of ssdc on ssr mitigation , tdeng hvdc as an example 在psasp小干擾線性化平臺psaspaisst上，對基于ieeefbm的hvdc系統、基于ieeefbm的svc系統和基于ieeefbm的statcom系統分別進行了ssr小干擾穩定分析，驗證了在這些裝置中安裝次同步振蕩阻尼器（ ssdc ）對r的抑制作用，并以hvdc為例，研究了ssdc輸入信號對其抑制ssr的影響。
On the contrary , because of the effect of positive damping provided by the inverter , the unit near a inveter will have no subsynchronous oscillation risk . based on the same method described above , a damping study is carried out for a hybrid ac / dc system , which include a hvdc link and an ac transmission line in parallel 研究表明，系統整流站附近的同步發電機組要承受電氣負阻尼作用，因此有可能引起機組低頻扭轉振蕩模式失穩；而hvdc的逆變站向其臨近同步發電機組提供正阻尼，因而機組不存在次同步振蕩危險。
Some practical method to lifting the rated capacity of vsc - hvdc is discussed . ( 4 ) the subsynchronous oscillation ( sso ) characteristics of a synchronous machine connected to a static var compensator is studied with the complex torque coefficient method realized by time domain simulation , and some important conclusions are obtained which can guide the design and operation of svcs to avoid sso problem ( 4 )基于時域仿真實現的復轉矩系數法，對與靜止無功補償器svc相聯接的同步發電機組的次同步振蕩( sso )特性進行了深入的研究，得出了一些重要結論，可為svc的設計和運行提供避免sso的依據。
Torsional interaction exists between hvdc converters and turbine - generators , and negative electrical damping provided by hvdc may cause subsynchronous oscillation ( sso ) that can lead to turbine - generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency 高壓直流輸電( high - voltage - direct - current - - - - hvdc )系統與臨近同步發電機組之間存在著扭振相互作用， hvdc的電氣負阻尼作用有可能引起機組在次同步頻率范圍的扭轉振蕩。
This paper studies two tcsc study systems , a tcsc system based on ieee first benchmark model ( ieee fbm ) and a simplified yi - feng 500kv tcsc study system , with ssr eigenvalue analysis in the platform of psaspfmsst . it proves the funtion of tcsc to mitigate subsynchronous resonance ( ssr ) . it also analyzes the influence of thyristor triggering algorithm of tcsc on ssr mitigation 本文在psasp小干擾線性化平臺psasp msst上，對基于ieeefirstbenchmarkmodel ( ieeefbm )的tcsc系統及簡化的伊馮500kv可控串補研究系統，進行了ssr小干擾穩定分析，驗證了tcsc對次同步諧振（ ssr ）的抑制作用，并研究了觸發算法對tcsc抑制ssr能力的影響。
Then the different behaviors between fixed series capacitor and tcsc are compared aiming at ssr , when they are individually applied to typical model of ieee second benchmark on subsynchronous resonance 繼而以ieeesecondbenchmarkonsubsynchronousresonance典型模型為例，比較了固定電容串補與可控串聯補償在模型系統中針對同步發電機次同步振蕩這一行為所造成的差異表現。
From the viewpoint of electrical damping , this dissertation focus on the damping analysis of subsynchronous oscillation for different systems , such as hvdc system , hybrid ac / dc system and multiple - converter hvdc system 目前，直流輸電技術已經在我國得到了廣泛的應用，并且在今后的幾十年中，直流輸電在我國還將有更為廣闊的應用前景。
This simplification principle is the foundation of the following analysis . using the test signal method , a detailed analysis of subsynchronous oscillation for a hvdc system is performed ( 3 )對一個僅含有直流輸電線路的系統，采用復轉矩系數- - - -測試信號法，對其次同步振蕩特性進行了分析。
In an ac system with multiple hvdc converters , turbine generators can interact adversely with all the converters through electrical connection , which makes the subsynchronous oscillation more complicated 并通過對含有多個直流換流站系統的電氣阻尼特性分析，驗證了該指標的有效性。
The theory of complex - moment - coefficient method is provided due to ssr , and the relationship between complex - moment - coefficient d ( m ) and subsynchronous frequency is also illustrated 在ssr研究中，主要闡釋了復數力矩系數法研究的機理，探討了復力矩系數d ~ ( ( m ) )與次同步頻率的關系。
These models have enough precision in subsynchronous oscillation ( sso ) problem analysis 這種模型對于分析次同步振蕩( sso )問題，具有足夠的精度。
Discussion of several analytical approaches and tools about subsynchronous resonance 幾種次同步振蕩分析方法和工具的闡述