Power quality comprehensive optimization system for low-voltage distribution network power alternative scenario and control method thereof

A technology of power quality and power replacement, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of reactive power shock three-phase, unbalanced fluctuation, large reactive power consumption, etc.

CN110854867AInactive Publication Date: 2020-02-28STATE GRID HUNAN ENERGY SAVING SERVICE
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-02-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a power quality comprehensive optimization system for a low-voltage distribution network power alternative scenario and a control method thereof. The power quality comprehensiveoptimization system in the present invention includes a passive reactive power compensation unit and multiple multi-objective power quality optimization units. The passive reactive power compensationunit includes a passive co-complementary capacitor, and one or two of a sub-complementary capacitor, and an interphase bridging capacitor. In view of the power consumption characteristics of the power alternative scenario, the system can effectively manage various problems such as three-phase imbalance, reactive power, and harmonics of power quality, and achieve multi-objective comprehensive optimization with a fast dynamic response under high-power and high-speed impact conditions so as to improve power supply reliability and power quality. In addition, the control method of the system can automatically select the optimal operating mode according to the real-time operating state of the system, that is, minimizes the system loss as much as possible on the premise of ensuring a system governance effect, and is an efficient and energy-efficient control management method.
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Description

technical field

[0001] The invention relates to a power quality comprehensive optimization management technology in a low-voltage distribution network power replacement scenario, and in particular to a power quality comprehensive optimization system and a control method for a low-voltage distribution network power replacement scenario. Background technique

[0002] In the low-voltage distribution network, the problem of power quality is becoming more and more prominent, especially with the advancement of power replacement projects, the problem of power quality will become extremely severe. The power quality problem in the power replacement scenario is typical and specific. Most of the power replacement components in low-voltage distribution network applications are single-phase loads, and the power of a single load is relatively large, and its share in the low-voltage load is high. The differences lead to serious three-phase unbalance problems, which cause a large power impa...

Examples

Embodiment Construction

[0025] The following will take a 400V distribution network in a low-voltage distribution network power replacement scenario as an example to further describe in detail the power quality comprehensive optimization system and its control method in the low-voltage distribution network power replacement scenario of the present invention.

[0026] like figure 1 As shown, this embodiment provides a power quality comprehensive optimization system for low-voltage distribution network power replacement scenarios, including a passive reactive power compensation unit 1 and a plurality of multi-objective power quality optimization units 2, and the passive reactive power compensation unit 1 includes passive reactive power compensation. At least one of source co-complementary capacitors, split-complementary capacitors, and phase-to-phase jumper capacitors (the specific configuration can be flexibly combined), multi-objective power quality optimization unit 2, passive co-complementary capacit...