A microgrid energy storage device and control method combining battery and supercapacitor
A technology of supercapacitors and microgrids, applied in harmonic reduction devices, AC network load balancing, and AC networks to reduce harmonics/ripples, etc., can solve the problem of low power scheduling accuracy of energy storage devices
Inactive Publication Date: 2018-06-01
STATE GRID QINGHAI ELECTRIC POWER +2
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[0005] Aiming at the problem that the power scheduling accuracy of the energy storage device combined with battery and supercapacitor in the existing microgrid is not high, the present invention proposes a microgrid energy storage device and control method combined with battery and supercapacitor. The microgrid energy storage device Including battery, super capacitor, MPU controller, first single-phase inverter bridge, second single-phase inverter bridge, first LCL filter, second LCL filter, first drive module, second drive module, first to the fourth current sensor and the first to the fifth voltage sensor, and are connected to the bus bar of the microgrid through the first to the fourth cables, wherein the first single-phase inverter bridge is composed of the first to the fourth power tubes, and the second The single-phase inverter bridge is composed of fifth to eighth power tubes; the first LCL filter and the second LCL filter are both composed of single-phase inverter bridge side inductors, filter capacitors, and grid side inductors;
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[0040] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0041] The microgrid energy storage device includes a battery, a supercapacitor, an MPU controller, a first single-phase inverter bridge, a second single-phase inverter bridge, a first LCL filter, a second LCL filter, a first drive module, The second driving module, the first to the fourth current sensors (CT1~CT4), the first to the fifth voltage sensors (VT1~VT5), and connected to the microgrid bus through the first to the fourth cables (Z1~Z4) , wherein the first single-phase inverter bridge is composed of the first to fourth power transistors (S1-S4), and the second single-phase inverter bridge is composed of the fifth-eighth power transistors (S5-S8); the first LCL ...
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The invention discloses a microgrid energy storage apparatus and a control method in combination with a storage battery and a supercapacitor, and belongs to the technical field of microgrid control. A power dispatching instruction of the microgrid is decomposed into a high frequency part and a low frequency part; then the high frequency part of the power dispatching instruction is output by the supercapacitor; the low frequency part of the power dispatching instruction is output by the storage battery; and a variable proportion droop controller, virtual impedance, energy storage unit end voltage feedforward and other control ways are introduced, so that the stable operation of the microgrid is ensured, and the power quality of the system is improved consequently.
Description
technical field [0001] The invention relates to a micro-grid energy storage device combined with a storage battery and a supercapacitor and a control method, and belongs to the technical field of micro-grid control. Background technique [0002] During the operation of the microgrid, the power fluctuations and load fluctuations of new energy generation are likely to cause fluctuations in system voltage and frequency, and even cause system instability. In order to maintain the stability of the microgrid and improve the power quality, certain energy storage devices can be added to the microgrid system. [0003] Batteries are widely used in energy storage equipment, and their energy density is relatively large, but limited by the electrochemical reaction rate, the power density of batteries is relatively small, and they cannot quickly absorb or release large target power in a short period of time; supercapacitor charging What happens inside during discharge is a physical chang...
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IPC IPC(8): H02J3/32H02J3/01
CPCH02J3/01H02J3/32Y02E40/40
Inventor 李春来刘卫亮张海宁王印松
Owner STATE GRID QINGHAI ELECTRIC POWER