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Micro-grid combination control method based on inverter in energy storage unit

An energy storage unit and microgrid technology, which is applied in the parallel feeding arrangement of a single network, load balancing of AC networks, etc., can solve the problems of weak inertia of microgrid, voltage and power oscillation, and weak anti-disturbance ability of microgrid.

Inactive Publication Date: 2013-01-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the microgrid contains a large number of inverter power supplies and power electronic devices, resulting in weak inertia of the microgrid and weak anti-disturbance ability of the microgrid. When the above requirements are met, the voltage and power may fluctuate greatly, and even cause The breakdown of the microgrid

Method used

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  • Micro-grid combination control method based on inverter in energy storage unit
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  • Micro-grid combination control method based on inverter in energy storage unit

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Embodiment Construction

[0022] The grid-connected control method of the microgrid based on the inverter in the energy storage unit in this embodiment is as follows: before the microgrid is connected to the grid, the inverter power supplies running in parallel all adopt the droop control strategy, and the inverter power supply adopting the droop control strategy adopts The operation mode of peer-to-peer control. The micro-grid system adopts the peer-to-peer control operation mode, which means that the status of each inverter in the micro-grid system is equal; each inverter supplies power to the load according to the output capacity, and the output capacity is specifically Droop gain factor in its droop control.

[0023] Droop control is as formula (1) and (2):

[0024] ω=ω * -k p (P-P * ) (1)

[0025] E=E * -k q (Q-Q * ) (2)

[0026] In formula (1) and formula (2), P * , Q * is the reference value of active power and reactive power; P and Q are the output values ​​of active power and r...

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Abstract

The invention discloses a micro-grid combination control method based on an inverter in an energy storage unit. The control method is characterized in that inverter power supplies (of a micro-grid) which operate in a parallel manner before the micro-grid combination all adopt droop control policies; the inverter power supplies adopting the droop control policies adopt an operation mode of peer-to-peer control; a static switch which is used as a grid combination switch-on switch is adopted between the micro-grid and a power frequency power grid; the micro-grid combination control method comprises the following steps of: measuring and calculating a voltage amplitude value difference and a frequency difference at two sides of a public coupling point of the micro-grid and the power frequency power grid; adding the energy storage unit for adjusting so as to enable the voltage phase angle difference to meet voltage phase angle constraint conditions; closing a grid combination switch when all constraint conditions are met; and switching over inverter control policies of the energy storage unit to accomplish the whole process of the grid combination after the switch is closed. According to the method, the impact caused by the grid combination is reduced, and the micro-grid is smoothly combined into the power frequency power grid.

Description

technical field [0001] The invention relates to the field of inverter control and grid connection, in particular to a method for controlling an inverter in an energy storage unit to realize grid connection of a microgrid. Background technique [0002] In the traditional power system, the grid-connection condition is that the power grid waiting for grid-connection and the power frequency grid meet the voltage amplitude difference, voltage phase angle difference, and frequency difference at both ends of the public coupling point within a certain range, ensuring There is no excessive inrush current, and after the grid-connection is closed, the power grid to be paralleled can quickly enter synchronous operation. However, the microgrid contains a large number of inverter power supplies and power electronic devices, resulting in weak inertia of the microgrid and weak anti-disturbance ability of the microgrid. When the above requirements are met, the voltage and power may fluctuate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
Inventor 吴红斌陈俊飞丁明汤雪鹏程慧敏
Owner HEFEI UNIV OF TECH
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