Modularized medium-voltage energy storage system
A technology of modularization and energy storage unit, applied in the field of modularized energy storage system and medium voltage energy storage system, can solve the problems of high DC side voltage of power converter, obvious short-board effect of battery, unable to guarantee long-term stable operation, etc. Achieve the effect of small current harmonics, low cost and high reliability
Inactive Publication Date: 2012-02-15
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
Considering that the efficiency of single-stage power converter is <98%, the efficiency of two-stage power converter is <96%, the loss of transformer is 2%, and the total efficiency of energy storage system is <96% and <94%, respectively, the system efficiency is low
[0006] The voltage on the DC side of the power converter of ABB’s energy storage system is too high, which requires an extremely large number of batteries to be used in series. The short board effect of the battery is significant. The existing battery balancing technology Can not guarantee its long-term stable operation
Method used
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Embodiment
[0024] This embodiment is a 2MW battery energy storage system with a rated voltage of 10kV.
[0025] Such as image 3 As shown, the power module of this embodiment includes: 1 battery pack, 1 resistor, 1 contactor, 4 IGBTs and 1 set of capacitors. There are 11 energy storage units in each of the three phases A, B, and C, according to figure 2 The way of connection constitutes the entire medium-voltage energy storage system.
[0026] In this embodiment, the rated voltage of one storage battery unit is 1200V, and the nominal capacity is 400Ah.
[0027] In this embodiment, the pre-charging circuit is composed of a resistor R1 and a contactor K1. Among them: R1 and K1 are connected in parallel. One end of the resistor R1 and the contactor K1 is connected to the positive pole of the battery pack, which is the input end of the pre-charging circuit; the other end of the resistor R1 and the contactor K1 is the output end of the pre-charging circuit. The resistance value...
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The invention discloses a modularized medium-voltage energy storage system, comprising an energy storage battery unit, a pre-charging circuit, a single-phase H bridge converter and a connection inductor. The output end of the energy storage battery unit is connected with the input end of the pre-charging circuit so as to transmit a direct-current voltage, and the output end of the pre-charging circuit is connected with the direct-current end of the single-phase H bridge converter so as to transmit the direct-current voltage, in this way, an energy storage unit is formed; when an alternating-current side of each energy storage unit in three phases is connected in series, one end of each energy storage unit is a neutral point of the modularized medium-voltage energy storage system while the other end of each energy storage unit is connected with the connection inductor, and the other end of the connection inductor and a power grid form the three phases of the medium-voltage energy storage system. With same power, the modularized medium-voltage energy storage system has high voltage, low current and small current harmonics, and has low demand on single battery capacity; the modularized medium-voltage energy storage system can realize redundancy via a bypass, has high reliability and has the function of balancing the batteries; and while being used for the MW grade high capacity, the modularized medium-voltage energy storage system has lower cost than that of a low-voltage scheme.
Description
technical field [0001] The invention relates to a modular medium-voltage energy storage system, in particular to a modular energy storage system adopting a cascade structure, which is used in large-capacity battery energy storage occasions. It belongs to the field of battery energy storage. Background technique [0002] The use of battery energy storage to smooth wind power and photovoltaic power generation is an effective way to solve the difficulty of new energy grid connection and the problem of "abandoning wind" of wind power. The application of large-scale battery energy storage in the power grid will change the history that electric energy can only be transmitted but not stored, will have a revolutionary impact on the production and operation of the power grid, and will greatly promote the development of my country's smart grid. [0003] The battery energy storage system uses an AC / DC bidirectional power converter to realize the bidirectional flow of power between the...
Claims
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Login to View More IPC IPC(8): H02J15/00H02J7/00H02J7/02
Inventor凌志斌
OwnerSHANGHAI JIAO TONG UNIV