Peak-clipping and valley-filling power system and control method thereof
A technology of power supply system, peak shaving and valley filling, applied in the field of power supply system, can solve the problems of low efficiency, large power conversion loss of power supply device, high electricity cost, etc. Effect
Pending Publication Date: 2019-06-18
ANHUI TONGGUAN COPPER FOIL +1
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Problems solved by technology
The above-mentioned power sources are usually called "electrolytic power sources". The existing electrolytic power sources do not have large-capacity energy storage battery packs and charge and discharge control functions in terms of topology and control methods, that is, they cannot realize the function of "shaving peaks and filling valleys" in the use of electric energy. As a result, the electricity bills of electrolytic copper foil, electrolytic aluminum, electroplating and other large electricity-consuming enterprises remain high; at the same time, the existing electrolytic power supply has undergone three power conversion processes of AC-DC, DC-high-frequency AC, and high-frequency AC-low-voltage DC. The power conversion loss of the power supply device is large and the efficiency is low
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[0030] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
[0031] Such as figure 1 As shown, the topology of the peak-shaving and valley-filling power system includes three parts: AC / DC rectifier 1, energy storage battery pack 2, and DC / DC converter 3, in which the energy storage battery pack consists of multiple energy storage battery units according to the voltage level It is composed of series and parallel connection with the energy storage system capacity.
[0032] The AC / DC rectifier includes a filter inductor and a three-phase four-switch PWM rectifier, and the three-phase alternating current u of the distribution network sa , u sb , u sc Connect the three-phase four-switch PWM rectifier through the input filter inductor to obtain the DC voltage U dc , U dc The solid-state switch Q1 is connected to the solid-state switches Q2 and Q3, the solid-state switch Q2 is connected to the positive an...
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The invention provides a peak-clipping and valley-filling power system and a control method thereof. The peak-clipping and valley-filling power system comprises an AC / DC rectifier, an energy storage battery pack and a DC / DC converter, wherein the AC / DC rectifier is used for converting a three-phase alternating current of a power distribution network to a direct current and comprises a plurality ofenergy storage battery units which are connected in series and parallel, and the DC / AC converter comprises a plurality of Buck circuit modules which are connected in parallel. Electric energy is stored at power utilization valley, power is supplied by the energy storage battery pack at power utilization peak, and great economic benefit can be brought to a power utilization enterprise due to largeelectric cost difference at the peak and valley; and meanwhile, a high-voltage direct current is directly converter to a low-voltage direct current conforming to enterprise production requirement bymultiple Buck choppers, an electric energy conversion link is reduced compared with an existing electrolytic power supply, and the electric energy conversion efficiency of the power system can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of power supply systems, in particular to a power supply system for peak-shaving and valley-filling and a control method thereof. Background technique [0002] With the shortage of power supply in my country and the requirements of power environmental protection, the country vigorously promotes the power demand side management policy, and the time-of-use electricity price, as one of the means of demand side management, is playing an increasingly important role. The use of time-of-use electricity prices can realize peak shaving and valley filling, shift peaks and flat valleys, slow down power investment on the power generation side, improve power supply reliability, and reduce user electricity bills. In addition, my country's distribution network system is powered by alternating current, and the production electricity of electrolytic copper foil, electrolytic aluminum, electroplating and other enterprises is ...
Claims
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IPC IPC(8): H02J3/32
CPCY02P80/10Y02E70/30
Inventor 丁士启肖华根王同陆冰沪夏旭光周杰甘国庆
Owner ANHUI TONGGUAN COPPER FOIL