Dynamic droop control method for energy storage link to maintain microgrid bus voltage partition curve
A technology of bus voltage and control method, applied in electric vehicles, battery circuit devices, battery over-discharge protection, etc., can solve problems such as the inability to meet the DC side bus voltage stability.
Active Publication Date: 2021-07-06
HUBEI UNIV OF TECH
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Problems solved by technology
However, when the voltage change value is relatively small relative to the adjustment range of the bidirectional DC / AC inverter and is not within the adjustment control range of the bidirectional DC / AC inverter; when the relative adjustment range of the energy storage link is relatively large and is not within the adjustment range of the energy storage link, there is The control blind zone cannot satisfy the smooth control of DC side bus voltage stability under various circumstances
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[0054] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0055] This embodiment starts with maintaining the stability of the DC side bus voltage in the energy storage link. The DC side bus voltage of the microgrid is a key parameter for system stability. Therefore, it is important to consider maintaining the stability of the DC side bus voltage. There are three main factors that affect the stability of the bus voltage: output power of photovoltaic cells, load switching, and small signal disturbances of AC / DC converters. To determine the droop control strategy of the energy storage device: consider the service life of the energy storage device and the problem of "overcharge and overdischarge" to realize the bus resistive virtual impedance method of power distribution in the energy storage link and based on SOC (State of Charge, remaining capacity ) dynamic droop method, etc., and at the same time ensure the p...
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The present invention relates to the technical field of droop control for energy storage systems of DC micro-grids, in particular to a method for dynamic droop control of energy storage links to maintain micro-grid bus voltage partition curves, including dividing the energy storage links into system stable non-working areas, energy storage charging and discharging Control blind zone, energy storage charge and discharge dynamic droop control zone; for energy storage charge and discharge dynamic droop control zone, adopt dynamic droop control based on battery SOC and virtual impedance; for energy storage charge and discharge control blind zone, follow energy storage charge and discharge control blind zone The curve droop control of the exponential function is determined by the coordinates of the intersection with the energy storage charge and discharge dynamic droop control area and the function conductivity. This control method combines two characteristic working areas to design and judge the control process of the energy storage link, expands the control range of the energy storage link, and fundamentally solves the power distribution of the energy storage link, and the final output power tends to be equal. The voltage drop difference caused by droop control makes the system run more stably.
Description
technical field [0001] The invention belongs to the technical field of droop control of an energy storage system of a DC microgrid, and in particular relates to a dynamic droop control method for maintaining a microgrid bus voltage partition curve in an energy storage link. Background technique [0002] As the proportion of renewable energy in the modern power system continues to increase, scholars have proposed the concept of a microgrid to achieve efficient control of various forms of renewable energy in the region. At present, there are DC micro-grid, AC micro-grid and AC-DC hybrid micro-grid, among which photovoltaic and wind power are the most widely used. The use of new renewable green energy can alleviate the current energy crisis. Renewable energy such as photovoltaic power generation has attracted more and more attention, and energy storage technology is an indispensable part of photovoltaic power generation, so advanced energy storage technology is in It is a key ...
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IPC IPC(8): H02J3/38H02J3/32H02J7/35
CPCH02J3/382H02J3/383H02J3/32H02J7/35H02J3/388H02J7/00302H02J7/00306Y02E10/56
Inventor 张杰彭瑞许诚章子涵柳慧梅郑逸凡王琪刘格格杨景嵛
Owner HUBEI UNIV OF TECH