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put forward plans at the same year which boosted the development of Smart Grid.
Barack Obama issued American Recovery and Reinvestment Plan in January 2009,
indicating that US was planning to intelligentize its power grid. All the events
mentioned above reveals the urgent demand for the smart grid [1-4].
The Smart Grids in Europe and US are characterized by self-adapt, self-
optimize, and self-heal. They have achieved the power distribution intelligent
measurement, controllable load and the smart building, which are based on
Ethernet and intelligent bidirectional meters [5-6]. In China, some institutes such
as China Electric Power Research Institute, Tsinghua University, Harbin Institute
of Technology, North China Electric Power University, Central-South University,
Xian Jiaotong University, are researching on the Smart Grid [7-9]. Compare to the
intelligent power distribution of US, Europe, China should pay particular emphasis
on intelligentizing power transmission, in order to meet the increasing demand of
electrical energy and enhance the security and reliability of the power grid, and
further, promoting the development of coal-fired power, hydro-electricity,
nuclear electricity and large scale of renewable energy resource in intensive way
[10-11]. It is necessary to explore a new way to achieve smart grid under certain
power distribution circumstances, gathering the early experience of smart grid
transformation of China [12-13].
As the preliminary work on developing the smart grid, we focus on controlling
power quality of a coal-mine in Heilongjiang Province of northern China. According
to analyzing topology of network thermodynamics, the harmonic suppression and
reactive power compensation device was proposed based on analyzing the stability of
PPF, TSC and FC to equivalent reactance of the power system. By analyzing
combinatorial topology of filter and compensator, optimization capacity and
parameters of PPF and TSC was given based on FC which capacity of 6600kVar and
4 channels. Considering terrible 5.th harmonic current that measured by HIOKI power
quality analyzer 3196 the network topology that results in an infinite response at
resonance was analyzed. While this work remains to be seen how this is received in
other field, there's no reason why it shouldn't be effective for suppressing harmonic
current and compensating reactive power in 6.3kV power system. Moreover, the
negative effect that caused by zero-voltage-switch of TSC was eliminated by
proposed topology. The overheat phenomena of the filter reactor was analyzed also.
This work can provide reference for building up the smart grid in line with the
modern power quality in China.
2
The Research Background
The topology of the distribution substation of a coal mine is shown in Figure 1. The
loads include rectifier and converter device such as service incline winch with 272kW
DC motor, main mine lifter converter of capacity of 1000kVA, pumps, tunnel fan,
belt conveyor, excavation area winch and so forth. There is a main transformer which
the capacity of 20,000kVA and the short-circuit impedance is 9.06%. The voltage of
primary side and secondary side of the transformer is 66kV and 6.3kV respectively.
There were 2 banks of fixed capacitor which capacity of 6600kVar.
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