A dual-voltage distribution method for low-voltage distribution network
A low-voltage distribution network and distribution voltage technology, applied in electrical components, circuit devices, AC network circuits, etc.
Active Publication Date: 2018-12-04
重庆峰极智能科技研究院有限公司
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Therefore, by increasing the low-voltage distribution voltage level, establishing a dual-voltage distribution mode based on a three-winding transformer to take into account the energy-saving and efficient power distribution requirements of short-distance group loads and long-distance sporadic loads is currently a feasible technology.
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[0103] The basic idea of the dual-voltage power distribution method for the low-voltage power distribution network of the present invention is: first select the load and topology structure to be planned, and then add a power distribution voltage level U higher than 0.4kV m , U m Including any voltage from 0.41kV to 5kV, it is recommended to choose 0.8kV as the supplementary voltage level of low-voltage power distribution. Using 10 / U m / 0.4kV (Δ / Δ / Y connection) three-winding distribution transformer to take into account the needs of efficient power supply for short-distance group loads and long-distance sporadic loads, and then from the energy saving and loss reduction, investment and operation costs and safety of low-voltage distribution network The angle puts forward the dual-voltage power distribution criterion and selection principle, so as to determine the specific power supply voltage and power supply mode according to the actual situation of each load. The invention ...
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The invention discloses a low-voltage network double-voltage distribution method. The low-voltage network double-voltage distribution method includes: adding one 0.41kV-5kV distribution voltage grade Um to form a 10 / Um / 0.4kV three-winding distribution transformer; calculating loads by adopting power loss of SI and SII of a 10 / Um / 0.4kV power supply mode and a 10 / 0.4kV power supply mode on the transformer and a low-voltage line; if the SI is smaller than the SII, adopting 10 / Um / 0.4kV double-voltage distribution mode on the loads, and if not, keeping the original 10 / 0.4kV power supply mode unchangeable. For any loads, voltage amplitude constraints and current offset constraints are needed to be met if the 10 / Um / 0.4kV power supply mode is adopted. With the method, efficient power supply requirements of the loads can be met, requirements on reducing low-voltage distribution network transmission losses and improving quality of transmission voltage are finally met by selecting the optimal distribution modes according to multiple factors, and the method is suitable for distribution situation of both close-range group loads and remote sporadic loads.
Description
technical field [0001] The invention relates to a low-voltage distribution network, in particular to a dual-voltage energy-saving power distribution method based on a three-winding distribution transformer, and belongs to the technical field of power system power transmission and distribution. Background technique [0002] As an important component of the power system, the low-voltage distribution network is the final link in the transmission of electric energy from the upper power grid to users. The safety, reliability and power supply quality of its operation have a direct impact on users. my country's low-voltage power distribution system has only a voltage level of 0.4kV, and low-voltage cables are usually directly drawn from the low-voltage side of the distribution transformer to the user end. Due to the small transmission capacity of low-voltage lines and the limited power supply radius, resulting in many low-voltage outlet circuits, crowded line channels, and heavy li...
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IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 熊小伏匡仲琴欧阳金鑫
Owner 重庆峰极智能科技研究院有限公司