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The Research of Dstatcom Compensating the Unbalanced Load

Author: ZhangYanFang
Tutor: ZhongYanRu；ZhangXiaoBin
School: Xi'an University of Technology
Course: Power Electronics and Power Drives
Keywords: DSTATCOM unbalanced current direct current control
CLC: TM761
Type: Master's thesis
Year: 2009
Downloads: 111
Quote: 0
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Abstract


Static Compensator (STATCOM) is one of the most important controllers IN Flexible AC Transmission System, the examples of its application are appeared in power system both IN domestic and abroad. As so far, the applications and researches are emphasized particularly on the function of the reactive power or damped vibration in the system of Static Var Compensator. However, there have some factors in low-voltage network in our country, such as:the unbalanced severity of three-phase load, low load ratio, frequent change in power factor, complex running conditions. Therefore, The capacitance of small and medium sized STATCOM device for distribution network will have a wide application foreground in future in our nation. This paper does some research principally on reactive power compensation device, and designs a control algorithm for compensating negative sequence component in unbalanced load current and reactive power component.This paper analyses the power characteristic in unbalanced load system, and obtains the energy-exchange principle among power supply, load and compensator; determines a test method which used ip-iq method as a reference current; compares merits and drawbacks between direct current control and indirect current control; determines a method which adopted direct current control controlling the system. based on bang hysteresis control in direct current control method, in order to eliminate the interference of interphase and reduce switching frequency and switching loss, this paper adopts voltage vector hysteresis control method, using the space distribution of current error vector and reference voltage vector, according control regulation, obtains optimum voltage vector, limited the current error in ring width, eliminates the interference of interphase by using voltage space vector, achieves a stable and fast response, while reducing the switching frequency and loss. Simulation results show correctness and feasibility.Build a DSTATCOM experimental system based on the controller-TMS320LF2407A DSP, and do some experimental research;The experimental system contains two parts, the one of DSTATCOM generate the negative sequence element,and the other one absorb thethe negative sequence elemen. The experiment is emphasized on the function that DSTATCOM can generate the negative sequence element. The experimental results show that the method used in this paper direct current control has a good compensatory effects。

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts
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