Abstract
In the paper, the influence of harmonic was taken into consideration during the realization of the AVC system in the power grid of Wuhu region, relevant study and development were conducted from the perspective of application and practice, and concrete proposal of practicable reactive voltage power optimization was put forward. The system adopted two-layer control plan: whole-network coordination layer and execution layer within transformer substation. Optimization algorithm adopted the reactive power optimization method with relaxed constraints so as to improve the convergence and computation speed of reactive power optimization. To control the impact of harmonic, a hybrid active power filter scheme which was made up of passive power filter and active power filter was adopted, thus improving the cost performance of the AVC system. The result of applying the AVC system in the power grid of Wuhu region shows that the system is stable and reliable, obviously decreasing the operation times of equipment and improving the voltage qualified rate and power factor of panel point.
Highlights
Unreasonable distribution of reactive power flow and unreasonable distribution of reactive power in large generator units are outstanding problems in the power grid of most regions in China
The complexity of the power system continuously improved with the rapid expansion of the size of regional power system and the structural system of interconnected power grid, which made the original pattern of only setting automatic control equipment of reactive power and voltage in transformer substation difficult to realize economic operation of power grid
For single transformer substation in regional power grid, the compensating partial adjustment of locally improving the voltage qualified rate and power factor without entire-network reactive power optimization will lead to the deterioration of the operation of superior power grid and at the same time, it may result in the frequent adjustment of voltage and reactive power in on-load voltage regulation of power grid, more leading to unreasonable voltage regulation and reactive power flow
Summary
Unreasonable distribution of reactive power flow and unreasonable distribution of reactive power in large generator units are outstanding problems in the power grid of most regions in China. For single transformer substation in regional power grid, the compensating partial adjustment of locally improving the voltage qualified rate and power factor without entire-network reactive power optimization will lead to the deterioration of the operation of superior power grid and at the same time, it may result in the frequent adjustment of voltage and reactive power in on-load voltage regulation of power grid, more leading to unreasonable voltage regulation and reactive power flow. The VQC device belongs to single substation adjustment, its influence on system operation can not be taken into overall consideration and it is hard to achieve the optimization result of the integrated control of voltage reactive power. The survey of Li Duanchao on the power grid of Anhui province [4]
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