Affiliation:
1. School of Physics, Sun Yat-Sen University, Guangzhou, China
2. Guangdong Provincial Key Laboratory of Photovoltaic Technology, Sun Yat-Sen University, Guangzhou, China
Abstract
Background:
Static Synchronous Compensator plays an essential role in governing the
reactive power and harmonics of power systems. The accuracy and real-time performance of reactive
power and harmonic detection are necessary to ensure balancing compensation effectiveness.
The traditional dq current detection method can only extract positive sequence components in the
positive sequence rotational reference frame and extract negative sequence components in the negative
sequence rotational reference frame.
Objective:
This paper aims to give a practical and straightforward current detection solution to enhance
the compensator performance and simplify the control system by extracting the positive sequence,
negative sequence, and harmonics in the positive sequence rotational reference frame.
Methods:
Firstly, a grid-connected four-quadrant converter with an Inductance-Capacitance-
Inductance (LCL) filter balancing compensation topology is constructed. Then an improved current
detection algorithm is proposed to extract the positive sequence, negative sequence, and harmonics
in the positive rotational reference frame separately. Finally, the Direct Current (DC) side voltage
design method is discussed to avoid the overmodulation effects.
Results:
Matlab simulation and a prototype 500kVA Static Synchronous Compensator (STATCOM)
experiment are implemented to demonstrate the proposed method.
Conclusion:
The proposed strategy can effectively improve the compensation accuracy, and the
system structure is simplified while the stability and reliability of the whole system are ensured.
Funder
Science and Technology Planning Project of Guangdong Province, China
Publisher
Bentham Science Publishers Ltd.
Subject
Electrical and Electronic Engineering,Electronic, Optical and Magnetic Materials