Multi-mode comprehensive control method of dynamic voltage restorer based on super capacitor energy storage
A dynamic voltage recovery, super capacitor technology, applied in current collectors, electric vehicles, battery circuit devices, etc., can solve the problems that the dynamic response of the control strategy is difficult to meet the use requirements, the detection is difficult, and the fault types are complex.
Active Publication Date: 2021-09-10
STATE GRID HUNAN ELECTRIC POWER +2
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[0005] The invention provides a multi-mode comprehensive control method of a dynamic voltage restorer based on supercapacitor energy storage, which is used to solve the complex types of faults that may occur in the grid voltage and the difficulty in detection. DVR is used as a device for compensating voltage drops. The dynamic response of the policy is difficult to meet the technical problems of the use requirements
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[0056] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0057] see Figure 14 , is a schematic diagram of the topological structure of the dynamic voltage restorer for supercapacitor energy storage in this embodiment, and the dynamic voltage restorer for supercapacitor energy storage in this embodiment includes: grid connection terminals and loads, transformers, LC Filter circuit, inverter H-bridge unit, DC side capacitor, Buck-Boost unit and supercapacitor array. Among them, the LC filter circuit is connected in series to the output end of the inverter H-bridge unit, the primary side of the transformer is connected in parallel with the capacitor C in the LC filter circuit, and the secondary side is connected to the power grid; the three independent inverter H-bridge units are connected in parallel with ...
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The invention discloses a multi-mode comprehensive control method for a dynamic voltage restorer based on super-capacitor energy storage. The method is applied to the dynamic voltage restorer based on the super-capacitor energy storage comprises a super-capacitor charging mode and a voltage compensation mode. According to the super-capacitor charging mode, when the dynamic voltage restorer works in a super-capacitor mode, energy is taken from a power grid and stored in a super-capacitor, specifically, when it is detected that the voltage of the power grid is stable, an AC-DC direct current side voltage is kept constant through a voltage outer loop, a current inner loop and a power feedforward link, and then the super-capacitor is charged with the constant power through a DC-DC circuit. According to the voltage compensation mode, when the dynamic voltage restorer works in a voltage compensation mode, the super-capacitor discharges to compensate the voltage drop of the power grid, specifically, when the voltage drop of the power grid is detected, the drop voltage is compensated through an AC-DC inverter, and then the voltage at a DC-DC high-voltage side is maintained to be constant through the voltage outer loop, the circuit inner loop and the power feedforward link. According to the multi-mode comprehensive control method of the dynamic voltage restorer based on the super capacitor energy storage of the invention, the voltage compensation precision and response speed of the super-capacitor energy storage type dynamic voltage restorer are improved, and the stability of the power supply voltage at a load end is enhanced.
Description
technical field [0001] The invention relates to the technical field of power grid protection, in particular to a voltage compensation control method for a dynamic voltage restorer based on supercapacitor energy storage under power grid voltage drop. Background technique [0002] Voltage sag is a type of dynamic power quality problem with the highest frequency, the most serious impact, and the largest economic loss. The statistics of Kansai Electric Power Company in Japan show that most voltage sags are faults with a drop of less than 20% and a duration of less than 100ms. Although the dynamic power quality degradation does not last long, the consequences and economic losses to sensitive equipment and sensitive users are very serious. [0003] Energy storage DVR (Dynamic Voltage Restorer, dynamic voltage restorer) has the characteristics of high energy density, fast charging and discharging, long life, and no pollution. From 1998 to the present, many countries in the world h...
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IPC IPC(8): H02J3/12H02J3/28H02M3/158H02M7/797H02M1/14H02J7/00H02J7/02
CPCH02J3/12H02J3/28H02M3/1584H02M7/797H02M1/14H02J7/0068H02J7/02H02J2207/50H02J2207/20Y02E40/30
Inventor 吴传平周天念刘毓陈宝辉梁平
Owner STATE GRID HUNAN ELECTRIC POWER