Island parallel operation control method based on high-capacity energy storage system

A technology of an energy storage system and a control method, which is applied in the control field of isolated island parallel operation, can solve the problem of complex operating conditions of high-power battery energy storage systems in parallel isolated islands, which is not conducive to the realization of equal share control of multiple battery energy storage systems, without consideration Problems such as the safe operation range of the state of charge of the battery can be achieved to reduce the probability of cutting off, improve life, and prevent overcharging and overdischarging.

Active Publication Date: 2017-05-24
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Compared with the grid-connected operation, the parallel island operation conditions of high-power battery energy storage systems are more complicated, and how to realize the power sharing control of multiple battery energy storage systems is the main key difficulty
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  • Island parallel operation control method based on high-capacity energy storage system
  • Island parallel operation control method based on high-capacity energy storage system
  • Island parallel operation control method based on high-capacity energy storage system

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Embodiment Construction

[0025] see figure 1 , is a typical structural diagram of the application of the large-capacity energy storage system of the present invention, and the large-capacity energy storage system is usually configured in photovoltaic and wind power generation systems. Photovoltaics adopts a two-stage topology structure. The front stage uses a boost converter to achieve maximum power tracking control, and the latter stage uses a voltage source inverter to achieve power control. The wind power generation system consists of a permanent magnet synchronous motor, a wind turbine, and a dual PWM converter. The machine-side converter realizes maximum power tracking, while the grid-side converter realizes DC voltage control. The battery energy storage system is mainly composed of a battery array and a voltage source inverter. In the grid-connected mode, the energy storage system mainly works in the power stabilization control mode to reduce the power fluctuation on the grid side and improve th...

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Abstract

The present invention discloses an island parallel operation control method based on a high-capacity energy storage system. the improved droop control at the operation of the energy storage system considering the storage battery charge state is employed. the control method divides the system into three operation states according to the different charge states, a hysteresis controller is employed to obtain the changing droop factor to regulate the power state of the storage battery in real time to allow the storage battery to perform charging and discharging in advance according to the state of the storage battery so as to ensure that the storage battery is located at the safe operation range and allow the charge state of the storage battery to have the effect of equal distribution of the power. The defects are overcome that the safety operation range of the charge state of a traditional battery is small, the storage battery is easy to generate the overcharge and over-discharging phenomenon and the service life of the storage battery is low.

Description

technical field [0001] The invention relates to the technical field of optimal control of energy storage systems, in particular to a control method for island parallel operation based on large-capacity energy storage systems. Background technique [0002] The depletion of fossil energy and the increasingly serious problem of global temperature change have promoted the rapid development of renewable energy grid-connected power generation technology. In recent years, the grid-connected penetration of renewable energy such as photovoltaics and wind power has been continuously enhanced. Due to the random and intermittent characteristics of the output power of distributed power generation units, in order to improve the power quality and stability of the system, it is usually configured in wind power generation systems. The high-power energy storage system constitutes a small independent autonomous microgrid. [0003] The microgrid can operate in grid-connected and islanded modes...

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/385H02J3/386H02J3/388Y02E10/56Y02E10/76
Inventor 吕广强沈婷婷耿严岩顾伟杨鑫郭震
Owner NANJING UNIV OF SCI & TECH
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