Control method and control device for off-grid parallel system of energy storage inverters
A technology of energy storage inverter and control method, which is applied in the direction of DC network circuit device, circuit device, parallel operation of DC power supply, etc., can solve the problems affecting the stability of the energy storage inverter off-grid parallel system, etc., and achieves improved stability. The effect of reducing the common mode circulating current and eliminating the common mode circulating current
Active Publication Date: 2018-12-28
SUNGROW POWER SUPPLY CO LTD
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[0004] However, the DC sides of multiple energy storage inverters are connected to different batteries. When the voltages of the batteries are inconsistent, multiple energy storage inverters form a common-mode loop through parasitic capacitance coupling, and the common-mode voltage in the common-mode loop will be A common-mode circulating current is generated between the energy storage inverters, which affects the stability of the off-grid parallel system of the energy storage inverters
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[0108] As an implementation manner, the second control unit 50 includes: a third detection module, used to detect the AC current value of the secondary energy storage inverter; a third calculation module, used to calculate the AC current value of the secondary energy storage inverter and the difference between the operating current value of the secondary energy storage inverter; the third processing module is used to calculate the difference between the AC current value of the secondary energy storage inverter and the operating current value of the secondary energy storage inverter The value is PI adjusted, and the adjustment result is SVPWM modulated to generate a driving signal for controlling the secondary energy storage inverter.
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The invention discloses an energy storage inverter off-grid parallel system control method, and the method comprises: controlling a main energy storage inverter to operate according to a given operating current value; detecting direct current voltage values of the main energy storage inverter and an auxiliary energy storage inverter; according to the operating current value of the main energy storage inverter and a direct current voltage difference value between the main energy storage inverter and the auxiliary energy storage inverter, determining an operating current value of the auxiliary energy storage inverter; and controlling the auxiliary energy storage inverter to operate according to a given operating current value. Based on the control method disclosed by the invention, along with each storage battery discharging process, the voltage of each storage battery in the energy storage inverter off-grid parallel system is gradually close to each other, so that common mode voltage between energy storage inverters is decreased, and common mode circulation between the energy storage inverters is decreased, when the voltage of each storage battery is the same, the common mode circulation between the energy storage inverters can be eliminated, and the stability of the system can be improved. The invention also discloses an energy storage inverter off-grid parallel system control device.
Description
technical field [0001] The invention belongs to the technical field of energy storage inverters, and in particular relates to a control method and a control device for an off-grid parallel system of energy storage inverters. Background technique [0002] With the rapid development of micro-grid technology and the improvement of power quality requirements for power loads, in order to realize the optimal allocation of micro-grid system capacity, off-grid parallel connection of energy storage inverters has become a trend of technological development. [0003] figure 1 It shows a structure of an off-grid parallel system of energy storage inverters, the off-grid parallel system of energy storage inverters includes energy storage inverter 1 to energy storage inverter M, M is an integer greater than 1, each The DC side of an energy storage inverter is connected to a battery, and the AC sides of multiple energy storage inverters are directly connected in parallel to supply power to...
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IPC IPC(8): H02J1/10
CPCH02J1/102
Inventor 曹伟洪婷婷余勇
Owner SUNGROW POWER SUPPLY CO LTD
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