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1、Comparison of high capacity SVC and STATCOM in real power grid Ding Lijie, Liu Yang Test and research institute Sichuan electric power Chendu, China ding_Miao Yiqun College of Electrical Engineering Zhejiang University Hangzhou, China AbstractBoth SVC (Static Var Compensator) and STATCOM (Static Syn
2、chronous Compensator) are important equipment of reactive compensation, which are compared in voltage supporting, improving the transient stability and transmission limit, and damping low frequency oscillation. Simulation results are presented as high capacity static var system for SVC or STATCOM is
3、 placed on transmission path of power system. Firstly, single SVC and STATCOM are limited in voltage supporting after fault occurrence, but STATCOM is little better than SVC. Secondly, STATCOM is much better than SVC in improving the transient stability and transmission limit. Thirdly, on the dampin
4、g low frequency oscillation, STATCOM is much better than SVC as SVC and STATCOM have the same capacity, and performs similarly with SVC as the two have the same controllable capacity. Lastly, the results also indicate that dynamical response speed effects the control result little though STATCOM res
5、ponses much faster than SVC. Keywords-SVC; STATCOM; voltage supporting; transmission limit; damping control I.INTRODUCTIONRecent advances in power electronics have led to the development of the flexible alternating current transmission systems (FACTS). SVC (Static Var Compensator) and STATCOM (Stati
6、c Synchronous Compensator) are such a kind of FACTS device which are used primarily for the purpose of reactive power support and voltage control. SVC is basically a shunt connected static var generator/load whose output is adjusted to exchange capacitive or inductive current so as to maintain or co
7、ntrol specific power system variables. STATCOM is a voltage-source converter based device, which converts a DC input voltage into an AC output voltage in order to compensate the active and reactive needs of the system. With the widespread use of FACTS device and the rise of smart grid, SVC and STATC
8、OM are paid more and more attention 1,2. As reactive compensation equipment, high capacity SVC and STATCOM are used primarily for transmission system in power grid. Requirements for transmission system are as follows 3: 1) Voltage supporting 2) Improving the transient stability and transmission limi
9、t 3) Damping low frequency oscillation Both SVC and STATCOM can meet these requirements. It is pointed out in 2 that STATCOM are much better than SVC in technique as the output characteristics, power loss, response time, and harmonics, even though STATCOM is costly and more complicated. In reality,
10、SVC is used more often than STATCOM as reactive compensation equipment in transmission system of power grid, and the ratio is about 6.7:1. This paper is organized as follows: Section II compares the voltage supporting, transient stability and transmission limit, and damping low frequency oscillation
11、 effect separately for high capacity SVC and STATCOM when they are located in transmission path of power grid. A conclusion is given in section III. II.COMPARISON OF HIGH CAPACITY SVC AND STATCOMAPPLICATION Si-Chuan power grid considered in this paper is part of the China power grid. It has two volt
12、age levels of 500 kV and 220 kV, contains over 500 buses and 100 generators. Si- Chuan power grid introduces long-distance and large power sending out because of the abundant hydroelectric power resource and its location across China. With the rise of the national UHV (ultra high voltage) interconne
13、cted power grid, the insufficiency of dynamic var compensation and low frequency oscillation is more serious in Si-Chuan power grid. Such a network is highly nonlinear and non-stationary and normally prone to various faults and disturbances, such as three phase short circuits, switching on/off shunt
14、 loads and/or transmission lines and suchlike. Power system might suffer from internal instability or poor damping when exposed to transient and dynamic disturbances. As shunt FACTS device, SVC and STATCOM provide excellent dynamic performance, can be capable of voltage supporting, improving the tra
15、nsient stability and damping low frequency oscillation when fault occurs4,5. A.Voltage Supporting Controlling the voltage at the point of connection to the power network is one of the objectives of the SVC and STATCOM, which can adjust reactive power output quickly and continuously. To verify the in
16、fluence for voltage supporting in the transmission path by reactive compensation equipment, select 35kV bus of the 500kV substation to install the reactive compensation equipment in Si-Chuan power grid. When 1 p.u. reactive current was injected into the 35 kV bus, the output of 500kV bus is about: cV00.007ccVVI? (1) Where is the initia
