Current-limiting energy-storing circuit
An energy storage circuit and current limiting technology, applied in the electrical field, can solve the problems of limited charging and discharging times, small energy storage capacity of super capacitors, environmental pollution, etc., to reduce investment costs and increase stability.
Inactive Publication Date: 2008-05-21
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
The charging and discharging speed of battery energy storage is slow, cannot meet the instantaneous high power exchange, and has environmental pollution problems; the energy storage capacity of supercapacitor is small, and the number of charge and discharge times is limited; pumped energy storage is limited by the environment, and the efficiency is too low
Method used
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[0014] The present invention will be further described below in conjunction with accompanying drawing and embodiment:
[0015] The current limiting energy storage circuit provided by the present invention is as figure 1 , figure 2 Shown in the dotted box. exist figure 1 Among them, the present invention is connected to the outlet of the AC power system line and connected in series with the circuit breaker DL, which is composed of an equivalent AC current source I s , The reactor L and the capacitor C are connected in parallel and connected to the system in series through the connection transformer T.
[0016] exist figure 2 In the three-phase system, the present invention is respectively connected to the three-phase A, B and C circuit outlets in series with the circuit breaker DL, and the three phases are respectively provided by the equivalent AC current source I s , The reactor L and the capacitor C are connected in parallel and then connected to the transformer T A ...
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The circuit comprises paralleled equivalent AC source, reactor and capacitor through a connection transformer connected to system in series. The circuit is installed at line outlet of electric power system and cascaded to a breaker. Adjusting degree of resonance between inductance and capacitance can adjust degree of current limiting and compensating ratio for failure expediently. When system is in normal running, the circuit regulates systemic asymmetry, filtering, reactive compensation and active compensation as well as systemic tidal current. When system in failure, the circuit limits peak value and steady state value of short circuit current. The invention possesses features of high efficiency, simple structure, reliable. The circuit to solve too large failure current of electric system carries out power compensation. The circuit raises stability and flexibility in running condition if it is utilized in high voltage or supervoltage transmission.
Description
technical field [0001] The invention relates to a current-limiting energy storage circuit for a transmission and distribution network, which belongs to the technical field of electric engineering. Background technique [0002] Due to the development of the power system, the increase of the load, the investment of large-capacity units, power plants and substation equipment, especially the emergence of large power plants in the load center and the interconnection of large power systems, the capacity of the transmission and distribution network has greatly increased, and it has also made The level of short-circuit current is increasing day by day, and even the level of short-circuit current has exceeded the breaking capacity of current circuit breakers. If no measures are taken to control it, it will not only greatly increase the equipment investment of the new substation, but also have a great impact on the original substation equipment in the system, and even need to spend a ...
Claims
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IPC IPC(8): H02J3/00H02J15/00H02H9/02H02J3/01H02J3/18
CPCY02E70/30Y02E40/30Y02E40/40
Inventor 赵彩宏肖立业林良真
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI