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DC energy storage power-voltage regulation method

A technology of DC energy storage and voltage regulation, applied in the direction of reducing/preventing power oscillation, AC network load balancing, single-network parallel feeding arrangement, etc., can solve problems such as inflexibility, reduce the adjustment range, and realize voltage Effect

Active Publication Date: 2021-03-12
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0003] At present, in the field of DC energy storage voltage regulation, linear droop control schemes are mostly used, and active power-voltage droop control is used to realize voltage regulation by controlling active power, which is not flexible.

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  • DC energy storage power-voltage regulation method

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Embodiment Construction

[0029] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Such as figure 1 As shown, the DC energy storage is different from the AC energy storage. It only has active power output, and there is no need to consider electrical quantities such as reactive power, frequency, and phase angle. In the DC energy storage converter, the DC energy storage active-voltage control is adopted, and the output error Signal e can be expressed as:

[0031]

[0032] In formula (1): U dc and U * dc are the actual and reference values ​​of the DC side voltage of the DC energy storage converter; P and P * is the actual value and reference value of the AC side active power of the DC energy storage converter; D is the droop coefficient of the DC energy storage converter; e is the droop control output error signal.

[0033] It can be known from formula (1) that the active power is proportional to the out...

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Abstract

The invention discloses a direct-current energy storage power-voltage regulation method which comprises the steps of adopting the direct-current energy storage active-voltage control in a direct-current energy storage converter to obtain an output error signal e expression; establishing a direct-current energy storage active-voltage droop control equation according to the condition that an energystorage converter works in an inversion state, the condition that the energy storage converter works in a rectification state and an output active power equation of a direct-current energy storage converter; when a regulating voltage is positive, establishing an adaptive droop coefficient Dm1; when the regulating voltage is negative, establishing an adaptive droop coefficient Dm2; forming an adaptive droop coefficient Dm; and introducing the adaptive droop coefficient Dm into a DC energy storage active-voltage droop control equation to obtain an adaptive droop control mathematical expression.According to the present invention, the self-adaptive active voltage droop control is adopted, so that an energy storage voltage adjusting range can be reduced.

Description

technical field [0001] The invention relates to a DC energy storage power-voltage regulation method. The method adopts self-adaptive droop control to reduce the regulation range of the energy storage voltage. Background technique [0002] The capacity of the power grid continues to increase, and the structure of the regional power grid becomes complex. The micro-grid composed of high-permeability distributed power points such as photovoltaics and wind power will inevitably affect the frequency stability of the large power grid due to its low inertia and low damping characteristics. As a power source that can be charged and discharged flexibly, the energy storage unit can dynamically absorb and release energy in the grid, and because of its fast response and flexible control, it has irreplaceable advantages in maintaining grid voltage stability. [0003] At present, in the field of DC energy storage voltage regulation, linear droop control schemes are mostly used, and active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/28H02J3/24
CPCH02J3/48H02J3/28H02J3/24
Inventor 杨沛豪孙钢虎兀鹏越柴琦王小辉寇水潮高峰姜宁郭新宇孙梦瑶李志鹏赵俊博薛磊贺婷张立松郭霞
Owner XIAN THERMAL POWER RES INST CO LTD
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