Voltage reactive treatment system and method for power distribution network area

Abstract

The invention discloses a voltage reactive treatment system and method for a power distribution network area. The integrative reactive compensation and the dispersed reactive compensation are combined on the power distribution network side, compensation capacities of compensation points are determined according to a global control strategy, and network reactive power and node voltage are reasonably adjusted, so that a power grid operates in an optimal operating mode, and the user power supply quality of the power distribution network area can be improved remarkably within a short period with least investment. By means of the global control strategy, the optimal compensation scheme of the dispersed reactive compensation is determined; the voltage reactive treatment system and method are of great significance on lowering network losses, improving system voltage qualified rate and improving quality of electric energy, and are beneficial to construction of a strong energy-saving type power distribution network.

Description

technical field [0001] The invention belongs to the field of electric power technology, and relates to a distribution network voltage management system and method, in particular to a distribution network area voltage and reactive power management system and method. technical background [0002] At present, my country's distribution network has the following basic characteristics: extremely wide geographical distribution, different lengths of power supply radius, large changes in load levels, and the peak and valley load periods are diverse due to different regions, and the voltage qualification rate is generally low. Preliminary research shows that the variation law of the voltage offset in the distribution network is complicated, and the difference between the peak and the valley of the load is large. Low, especially 380 / 220V low-voltage power supply lines. For example, it has been reported that the user-side phase voltage at the head end of a feeder line reaches 255V, and...

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Problems solved by technology

However, these measures have problems such as wide scope, long project implementation period, and excessive capital investment, making it difficult to improve the quality of power supply voltage of distribution network in a short period of time.

If the voltage quality of all outgoing lines is improved by completely relying on the voltage regulation of the 10kV busbar voltage in the substation, it will become difficult to coordinate adjustment due to the large fluctuation range and inconsistent fluctuation law of the load of each line, and often lose sight of the other

At present, the distribution network often uses reactive power compensation devices to improve the qualification rate of the distribution network node voltage, but there is no coordination mechanism among multiple reactive power compensation devices, so that the voltage qualification is only achieved for a certain node. not necessarily the best

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