A system of peak shaving and valley filling and power quality comprehensive management and its working method

Abstract

The invention provides a peak load shifting and power quality comprehensive treatment system. The peak load shifting and power quality comprehensive treatment system is characterized by comprising a three-phase inverter module INV1, a three-phase inverter module INV2, a DC support capacitor, a bidirectional thyristor module, a controller I, a controller II, a transformer T2, a DC bus, a DC-DC converter and a storage battery; and the working method comprises two working modes, namely a normal AC voltage and an abnormal AC voltage of a power supply of the system. The peak load shifting and power quality comprehensive treatment system has the advantages of being high in response speed, high in standby efficiency, stable to work, simple in structure, low in product cost, convenient to maintain, easy to operate and relatively high in cost performance, and has an uninterruptible power supply function, a harmonic compensation function, a reactive power compensation function and a three-phase unbalance compensation function; the power consumption cost is reduced; and the economic benefits of enterprises are improved.

Description

(1) Technical field: [0001] The invention belongs to the technical field of electric power equipment, in particular to a peak-shaving and valley-filling and power quality comprehensive control system and a working method thereof. (two) background technology: [0002] Power plants usually generate electricity continuously around the clock. If the generated electricity cannot be consumed in time, the utilization rate of energy used for power generation will be reduced, especially for new energy power generation. The power generation capacity of a power plant is usually relatively fixed. However, the peak of power consumption is usually during the day, which causes the phenomenon of insufficient electricity during the day, and becomes a low point of power consumption at night, resulting in a decrease in the utilization rate of power generation energy. To solve this problem, the power system uses peak Valley time-of-use electricity price means to move part of the peak load to th...

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Problems solved by technology

[0004] For the high-end manufacturing industry that requires high power supply reliability, the corresponding solution is mainly to configure an uninterruptible power supply (UPS——Uninterruptible Power System) for important sensitive loads. Online UPS has a large online loss and high cost, and backup UPS The slow response speed cannot meet the requirements of sensitive loads, and the uninterruptible power supply is also based on battery energy storage, which leads to the repeated use of the peak-shaving and valley-filling energy storage device and the uninterruptible power supply energy storage device, which greatly increases production investment and reduces the cost of the enterprise. Electricity efficiency

[0005] At the same time, with harmonic pollution, low power factor, and three-phase unbalanced power quality problems are becoming more and more prominent. The corresponding solutions are mainly active power filter (APF—Active power filter), static var compensation generator (SVG—— Static Var Generator), etc., but due to the single function of these power quality control equipment, it also greatly increases the production investment of enterprises

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