SOC balance control method of cascaded H-bridge type energy storage STATCOM

A balanced control and bridge-type technology, applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, etc., can solve the problems of SOC balanced control in STATCOM, etc., to improve utilization rate and service life, and improve reactive power The effect of support

Active Publication Date: 2021-04-16
STATE GRID HUNAN ELECTRIC POWER +3
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for SOC balance control of cascaded H-bridge energy storage STATCOM to solve the problem of difficult SOC balance control in STATCOM

Method used

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  • SOC balance control method of cascaded H-bridge type energy storage STATCOM
  • SOC balance control method of cascaded H-bridge type energy storage STATCOM
  • SOC balance control method of cascaded H-bridge type energy storage STATCOM

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Embodiment Construction

[0046] figure 1 It is the topological diagram of the angular cascaded energy storage STATCOM of the present invention, which adopts the angular cascaded H-bridge structure, and each chain link is composed of n H-bridge inverter units connected in series to form a ladder wave voltage, which is connected to the transformer through the filter reactance L coupling The low-voltage side and the high-voltage side of the transformer are connected to the power grid at the receiving end. The energy storage unit is connected in parallel to the DC side of the H-bridge inverter unit through a bidirectional DC / DC converter.

[0047] figure 2 It is a structural diagram of the cascaded H-bridge type energy storage STATCOM SOC balance control of the present invention, which includes the calculation of the SOC balance current between phases, the SOC balance control within the phase, and the model predictive control based on the finite control set. The final current command is obtained by add...

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Abstract

The invention discloses an SOC balance control method of a cascaded H-bridge energy storage STATCOM, and the method comprises the steps: building a state equation by employing a chain link current and a total capacitor voltage as state variables, and carrying out discretization to obtain a discrete state equation of a chain link; then, combining model predictive control based on a finite control set to obtain a level number Q (k) needing to be output; and then sorting the SOC values of modules by utilizing an SOC sorting method, and finally distributing switching to each H-bridge module according to the number Q (k) of levels required to be output in the current period and the direction of the current of the chain link at the moment, thereby realizing the balance control of the SOC in the chain link. Besides, the equivalent SOC of each link are averaged to obtain an SOC equalization control instruction of each link, and then closed-loop control is carried out to enable the equivalent SOC of each phase link to be close to the total equivalent SOC so as to realize SOC banlance control between the links. According to the method, the SOC balance control problem in the energy storage STATCOM is solved to a certain extent, the utilization rate of an energy storage system is increased, and the service life of the energy storage system is prolonged.

Description

technical field [0001] The invention relates to the field of STATCOM equipment research, in particular to an SOC balance control method of a cascaded H-bridge type energy storage STATCOM. Background technique [0002] When STATCOM is applied to HVDC system commutation failure suppression, it usually requires a large reactive power output, but STATCOM has output voltage and current quality that is greatly affected by the capacitance value of the DC side, reactive power output capacity that is greatly affected by grid voltage fluctuations, and only reactive power compensation The power leads to unsatisfactory power grid voltage stability, which greatly limits its application in the field of HVDC system commutation failure suppression. [0003] Energy storage batteries have the characteristics of high energy density, small self-discharge, less pollution, and long cycle life. And in recent years, with the improvement of battery performance and the reduction of cost, energy stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/10
Inventor 罗安舒钰成李军周小平武卫东洪乐荣伍咏红夏海涛陈远扬刘一锋
Owner STATE GRID HUNAN ELECTRIC POWER
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