Research on Reactive Power Compensation Technology in Distribution Grid
Youjie Ma
1
, Luwen Cao
1
,Xuesong Zhou
1
,Zhiqiang Gao
1
1.Key Research Laboratory for Control Theory & Applications in Complicated Systems
Tianjin University of Technology, Tianjin 300384, China
E-mail:1192867565@qq.com
Abstract: The researches of reactive power compensation in distribution network mainly consist of two aspects: the
research of reactive power compensation optimization theory and the research of reactive power compensation device.
According to certain configuration principle and optimization principle, the mode and capacity of reactive power
compensation can be optimized, which can effectively reduce the system loss and improve the power quality of
distribution network. At present, reactive power compensation devices include shunt capacitor, static var compensator
and static synchronous compensator (D-STATCOM). We could choose the appropriate reactive power compensation
device to compensate the distribution network in the view of practice and economy. This article would introduce some
aspects of reactive power compensation breifly, including several studies on compensation mode selection and capacity
determination. In addition, we would also introduce the working principle and the reactive current detection technology
of D-STATCOM which is the most advanced reactive power compensation device.
Key Words: Reactive Power Compensation, Distribution Grid, D-STATCOM, Reactive Current Detection
1. INTRODUCTION
At present, with the development of power industry,
power distribution network is becoming more and more
complex, and the power quality has also got increasing
attention, which is a challenge during the operation of the
distribution network. In power system, voltage and
frequency are two important performance indicators,
which mainly depends on the operating frequency of the
system active power balance, and the reactive power
balance that is mainly decided to run system voltage level.
Voltage affects the stability of the whole system. As the
terminal of power system transmission and distribution
network, the distribution network is directly connected
with the power equipment
so it is an important part of the
power system and power users[1].
1
The security of the
distribution network and the economic operation will
directly affect the users. With China's rapid economic
growth, the distribution network capacity has increased
dramatically the area distribution line below l0kV
provides about 50% of the total electricity supply area.
However, for a long time, most of the distribution
network in our country runs under the natural power
This work is supported by National Natural Science Foundation of
China (50877053) and Tianjin Natural Science Foundation of
China(09JCYBJC071000).
factor. The lack of reactive capacity and slow response is
a long-standing problem in the distribution network of our
country, that will cause great loss every year. Reactive
power compensation is essential to the safe and
economical operation of distribution network, related to
whether the user can get the safety and quality of electric
energy, the distribution network is directly connected with
the load, the reactive power consumed by the line and the
load must be balanced, otherwise it will affect the
operation level of the voltage. So, the research on reactive
compensation technology for power distribution systems
plays an significant role in safe operation of the
distribution network and the improvement of the
economic benefit of the power grid.
2. SIGNIFICANCE
Reactive power is very important for the distribution
network both on the economy and society .Because the
equipment needs reactive power to establish field. In the
process of high-speed operation of some equipment, the
reactive power variation with time is quite fast. So if the
reactive power consumed is not compensated in time, the
security and reliability of the distribution system will be
threatened. In the distribution system, the problem of
voltage sag and variation could lead to the collapse of the
power system and the collapse of the power system[2].
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2017 IEEE
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