47results about How to "Reduce energy storage capacity" patented technology

Disclosed herein are a light emitting diode (LED) driving apparatus and driving method for continuously driving an LED. According to the present invention, an LED driving apparatus and driving method for continuously driving an LED capable of compensating for a light output of an LED lighting using an energy chargeable and dischargeable element and / or circuit are proposed.

The invention relates to a parallel-connected unified power quality control device, which belongs to the technical field of power electronics and flexible AC power transmission and distribution. The device includes a voltage source converter, an energy storage unit, a resonant electronic switch and a main control system. The main control system is composed of a main controller and various sensors; the resonant electronic switch is connected in series Between sensitive loads, the two ports of the resonant electronic switch are respectively PCC 1 Point and PCC 2 point; the AC output port of the voltage source converter is connected to the PCC in parallel 2 point, and its DC side capacitor ports are respectively connected to the corresponding output ports of the energy storage unit; the main controller generates a control gate signal output and is connected to the voltage source converter and the resonant electronic switch. The method is to judge various power quality faults and control the device to quickly switch and operate among four modes; the invention has the advantages of simple structure, low cost, strong overload resistance and high operating efficiency.

The invention discloses a control method of a hybrid energy storage system for stabilizing the power fluctuation of an intermittent type power source, comprising the following steps of acquiring the real-time power of the intermittent type power source, the synthetic output power of power and stored energy, the SOC (State of Charge) of a battery and the voltage of a supercapacitor by a data acquisition module, and sending data to a stabilizing and control module; processing the data in the stabilizing and control module and judging whether the power output is needed or not according to a fluctuation power; and in the case of needing power output, outputting a control power instruction and a charge / discharge instruction, and carrying out output by the energy storage system according to the control instruction, wherein electric energy output by the energy storage system passes through PCS (Power Converters), is synthesized with the output of the intermittent type power source through a circuit breaker respectively and merges into a power grid through a transformer. By the adoption of the control method of the hybrid energy storage system for stabilizing the power fluctuation of the intermittent type power source, the defects that when the power fluctuation of the intermittent type power source is stabilized by the prior art, as the energy storage system mainly adopts a single energy storage medium, the ability of stabilizing the power fluctuation of the intermittent type power source is weak and the service life of an energy storage element is shorter are overcome; and therefore, the practicability and the economical efficiency are enhanced.

The invention discloses a new energy power supply system and a control method for urban rail traction network, including an independent energy storage system located in the middle section of the line and a wind-solar-storage combined power generation system located in the depot or parking lot at the end of the line; according to offline prediction data, Obtain load forecast power and expected peak-to-valley values ​​from historical data, and then judge whether there is a load based on urban rail traffic data; judge operating conditions based on real-time voltage, and compare the load forecast power and expected peak-to-valley values ​​at the next moment to judge whether it is load operation According to the peak and valley state, different control strategies are determined by judging the results, so as to realize effective control of the energy storage device in the independent energy storage system, the wind-solar combined power generation device and the energy storage device in the wind-solar-storage combined power generation system. The invention can not only promote the consumption of renewable energy such as local scenery, but also improve grid voltage fluctuations, effectively recycle regenerative braking energy and at the same time cut peak loads and fill valleys, reduce urban rail operating costs, and have good economic benefits.