vsc 中文意思是什麼

Then a vsc controller using on - off valve and two potentiometers are designed for cushioning control system. it can realize the balanced, no shock, no reversing cushioning. experiments under different air pressure, load mass are carried out, and the results prove that the vsc controller can be used in pneumatic cushioning

第五章首先介紹了變結構控制的原理和應用發展情況，然後針對本實驗系統設計了一個使用開關閥和端位位移傳感器的變結構控制方案，實現緩沖過程的平穩無沖擊和無回彈要求，並在不同氣源壓力、不同負載質量下分析了控制性能的變化，實驗結果證明緩沖控制採用變結構控制是可行的，並具有很強的魯棒性。

There are two implementations for discrete reaching law, both has obvious strongpoint and limi - tations. so the two was synthesized. simulation results showed that the discrete vsc is easier to be implemented by computer control system, and go further in decoupling between chattering control and system dynamics, while the robustness is not so good as continuous time vsc

本文的另一項工作是在連續系統的基礎上，討論了離散時間變結構控制策略和抖振控制，針對控制量加速度不足，提出了離散趨近律的兩種實現方式，由於兩種實現方式同樣具有明顯的優缺點，因此將兩種方式結合起來，增加了兩個與滑模面平行的切換面作為系統在兩種方式之間切換的界限，並通過計算機模擬驗證控制效果。

This system consists of a full bridge pwm ( pulse width modulation ) regenerative rectifier or so - called vsc ( voltage source converter ) that connected to pcc ( point of common connection ) at the power utility grid through a passive interface circuitry

這種系統包括一個pwm全橋可逆整流器或者所謂的電壓源變換器，通過無源電路介面與電網的pcc點（公共連接點）相連。

So the sliding mode variable structure controller was discussed, which has strong robustness against the disturbance, and the chattering phenomenon inherited from vsc was taken advantage to regular valve vibration for the purpose of avoiding coagulation on it, while precision of level control can be almost unaffected. but for the reason of control limitation, especially the acceleration insufficiency, the continuous time quasi - sliding mode vsc for one class of controllable system, as the substitution of ideal sliding mode control system, which was impossible to implemented, was researched, including the three essentials, reaching condition in particular, and the chattering ex - pression was given. furthermore, the effect to quasi - sliding mode motion and chatter - ing expression by extent disturbance was also analyzed

由於控制量相對受限制，並且主要體現在控制量加速不足方面，無法實現理想的滑模變結構控制，因此本文研究了一類能控系統在這種情況下的連續系統準滑模變結構控制，包括變結構控制三要素，尤其是到達條件；並且針對塞棒掛渣問題，給出了該情況下抖振的表達式；魯棒性方面，分析了外界擾動對準滑模運動的影響，並且給出了外擾作用下抖振的表達式。

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 ）基於時域模擬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。

Based on the adaptive interference canceling theory and the concept of space vector, an adaptive fundamental positive / negative sequence component and harmonic component detecting method is developed. due to the close loop structure, this method has quite good robustness, and can meet the requirement of the asymmetrical control of hvdc - vsc well

運用自適應干擾對消原理和空間矢量的概念，提出了一種基波正序分量、基波負序分量及諧波分量的自適應檢測方法，並進行了詳細的理論分析，為研究hvdc - vsc的不對稱運行控制奠定了基礎。

At last this chapter researches two ways that make system performance optimal, test way and pole allocation way. the affections of feedback parameters, air pressure and load quality are analyzed. chapter 5 introduces the theory, application and foreground of the vsc ( variable structure control ) system

最後一部分研究了實現系統狀態反饋控制的方法，包括試湊法和極點配置法，並分析了各反饋參數、氣源壓力和負載質量對控制性能的影響。

Some important parts for these two vsc - hvdc control systems are designed in detail, especially the structures and parameters of the vsc controllers, as well as the principles for selecting the equivalent inductance of the convertor transformer and the capacitance of the capacitor on the dc side of the vsc. digital simulation using netomac is done to verify the validity of those proposed control strategies. ( 2 ) the operation performance of the vsc - hvdc under some characteristic faulted conditions without any protection measures are studied, and the over - current and over - voltage of the vsc - hvdc during those faults is revealed

（ 2 ）對vsc - hvdc在沒有保護控制的情況下其交流側、直流側和vsc內部等部位發生常見較嚴重故障時的運行特性進行了模擬研究，總結出這些較嚴重故障可能對vsc - hvdc造成的危害，並針對這些危害提出了幾種切實有效的保護策略，模擬結果證實了應用這些保護策略可確保vsc - hvdc中的一些重要部件能夠在大多數類型的故障時免遭過電壓或過電流的損害。

The dissertation refers to comparatively full literatures in the field of vsc, and the development history and characteristics of vsc are summarized, and the elementary concepts, elementary definitions, elementary properties, elementary principles and design methods are particularly introduced, and the causes of the chattering phenomenon are systematically analysed, and the study status of the chattering phenomenon and the main methods to eliminate the chattering are elaborated. for the deficiencies of traditionary methods, three improved methods are developed, which are improved exponent reaching law solution, variable boundary layer solution and the solution by adding an auxiliary continuous control term. for uncertain linear systems, an adaptive fuzzy integral variable structure control stategy ( afivsc ) is put forward to eliminate the chattering around the sliding plane, which introduces fuzzy logic to soften the non - linear discontinuous sig nal in the control variable and utilizes adaptive theory to adjust output membership function according to how much the uncertainty of the system is

比較全面地查閱了關于變結構控制理論的文獻，總結了滑模變結構控制的發展歷史和特點，詳細介紹了變結構控制的基本概念、基本定義、基本性質、基本原理以及設計方法；系統分析了變結構控制系統抖振產生的機理，並闡述了國內外目前對抖振問題的研究現狀以及消除抖振的主要方法；針對傳統抑制和消除抖振方法的不足，改進了傳統方法，得到了三種新的消除抖振的方法? ?即改進的指數趨近律法、可變邊界層法和附加連續項法；針對不確定性線性系統，在變結構控制策略中引入模糊邏輯和自適應理論來消除滑動平面上的抖振，提出了一種自適應模糊積分變結構控制方案（ afivsc ） ，利用模糊邏輯來柔化控制量中非線性不連續部分，採用自適應理論，根據系統不確定性大小在線調整模糊輸出量的隸屬函數，另外，鑒于模糊控制本質上是有靜差的，所以本文選擇了帶積分項的切換函數，由於積分項的存在使系統較正為無靜差系統。

Founded in 1961, the vsc group is pioneer in the importation of steel rebars in hong kong

萬順昌集團於1961年成立，是香港首間鋼筋進口及存銷商。

Vsc - ryerson china limited, founded in oct. 26, 2006, headquartered in shanghai, it is a joint venture company formed by van shung chong holdings limited and ryerson inc

萬順昌瑞爾盛中國有限公司成立於2006年10月26日，是由萬順昌集團有限公司和瑞爾盛有限公司共同投資成立的合資企業，總部位於上海。

Vsc - ryerson china limited operates a number of highly efficient steel / metal processing service centers and supplies fabricated products to a domestic and international clientele with total logistic support

萬順昌瑞爾盛中國有限公司設有多家鋼材金屬加工服務中心並且提供全方位的物流服務給需求加工製品的國內外客戶。

Vsc, founded in 1961 and listed on the hong kong stock exchange since 1994 ( sehk : 1001 ), vsc is a leading processor and distributor of quality industrial and construction materials in the fast growing prc market

萬順昌成立於1961年，並於1994年在香港聯合交易所上市（股票： 1001 ） ，在快速發展的中國市場中萬順昌在工業和建築材料加工和分銷方面占據著領導地位。

Leveraging on the strengths of vsc and ryerson, vsc - ryerson china is able to combine international expertise with local market knowledge and operation experience, and have access to specialized resources and technical expertise from an international player

作為萬順昌和瑞爾盛的合資企業，萬順昌瑞爾盛中國有限公司的優勢在於其擁有本土市場的相關知識及營運經驗和來自國際企業的技術專長及專有資源的結合。

With strong manufacturing and processing capability, supplemented by an efficient global supply chain management and distribution network, vsc strives to be the preferred solution provider serving both multinationals and domestic manufacturers and end users in the china market

憑著強大的生產及加工能力，透過全球化的供應鏈管理及龐大的分銷網路，萬順昌致力成為中國最佳解決方案供應商，服務國際及國內生產商與最終用戶。

Van shung chong holdings limited ( " vsc " or the " company " ) and its subsidiaries ( together the " vsc group " ) is a leading distributor and processor of quality construction and industrial materials, playing a significant role in the building, the infrastructure development and the manufacturing industries in hong kong and mainland china

萬順昌集團有限公司（萬順昌或本公司）及其附屬公司（統稱萬順昌集團）乃一家極具領導地位的優質建及工業材料經銷商兼加工商，對香港及中國內地之建、基建發展及製造業貢獻良多。

The control strategy of the vsc which supplying a passive network is also proposed, and the designing of the passive high - pass filter for hvdc - vsc is briefly discussed

提出了連接無源網路時vsc的控制策略，簡單討論了hvdc - vsc無源高通濾波器的設計。

The system selects switching surface according to the approach of variable structure control. based on the control rules to design the variable structure controllers, the inner loop and the outer loop form a complete vsc control loop. the control system has switching surface and the system brings sliding along fixed desired trajectories

根據滑模變結構控制方法選擇切換面，根據控制律，設計變結構控制器，使內環和外環合成為一個vsc控制器，系統的控制有切換，而且在切換面上系統將會沿著固定的軌跡產生滑動運動。

Vsc - ryerson china commits to the highest degree of quality services in every sector of the steel supply chain from steel mills to end users, such as jit, and sequenced delivery, tailored to customer needs, it implements supplier consolidation with proven cost saving programs to provide the customer with efficient quality services at competitive costs

萬順昌瑞爾盛中國有限公司致力於提供從鋼廠到最終用戶的所有供應鏈環節的高質量服務，諸如：準時生產、逐一交貨、按客戶需求，用降低成本的供應商集成配送系統去提供客戶以具有竟爭力的質量服務。

Based on the concept of space vector, an open loop detecting method for the fundamental negative and positive sequence components as well as the harmonic components is developed, which combining the conventional detecting method based on filters and the concept of space vector. this method can overcome the defaults of the conventional detecting method, and can meet the requirement of the asymmetrical control of hvdc - vsc

基於空間矢量的概念，提出了一種開環的基波正序分量、基波負序分量及諧波分量的實時檢測方法，這種方法可以看作是空間矢量的概念與傳統的基於濾波器的諧波檢測方法的結合，它能夠克服原有的基於濾波器的檢測方法的不足，可用於hvdc - vsc的不對稱運行控制。