Abstract
Low-voltage distribution systems in our country are mostly used in agricultural loads and household loads. The value and using time of these kinds of loads are uncontrollable, which lead to the three-phase imbalance in low-voltage distribution system, and seriously affect the quality of power supply. A new type of the commutation system and an improved quantum genetic algorithm (IQGA) are proposed in the paper. At last, the rationality and the efficiency of the method are verified by a practical example.
Highlights
With the development of current society and the increase of people’s electricity consumption, the problem of power quality is becoming more and more obvious
The rationality and the efficiency of the method are verified by a practical example
Considering the situation of actual distribution network, it is necessary to ensure that the single-phase current does not exceed the maximum carrying capacity of the line after commutation, and the three-phase imbalance must meet the requirements of national standards, so the corresponding constraint condition is established, as shown in formula (8)
Summary
With the development of current society and the increase of people’s electricity consumption, the problem of power quality is becoming more and more obvious. Three-phase unbalance has great harm to power grid, including increasing line loss, power distribution system output reduction and generating zero sequence current [1]. Many measures have been taken to solve the three-phase unbalance problem. The control technologies of three-phase unbalance mainly use three-phase load automatic regulation devices, including capacitive devices, power electronic devices and commutation switch devices etc. The capacitive devices only realize the three-phase load balance of the distribution. The power electronic devices need to use multiple single-phase inverters, make the equipment larger and have high costs. The rationality and the efficiency of the method are verified by a practical example
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