Regulator saturation prevention control method for energy storage converter during low-voltage ride-through recovery
An energy storage converter and low-voltage ride-through technology, which is applied in the direction of AC network voltage adjustment, circuit devices, and AC network circuits, can solve problems such as overcurrent, prone to regulators, and saturation conditions, so as to avoid output failure. stable effect
Inactive Publication Date: 2020-11-17
中冶赛迪电气技术有限公司
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Problems solved by technology
The energy storage system plays an important role in ensuring the stability of the new energy micro-grid system. Therefore, the national standard requires that the energy storage converter should have low-voltage ride-through capability, and it is required that the energy storage converter should have low-voltage ride-through capability when the grid voltage drops below 0.2 times the rated voltage. The reactive current value output by the converter is at least 1.04 times the rated current, which will cause the energy storage converter to easily appear in the condition of regulator saturation during the transient process of grid voltage recovery, resulting in output instability and overcurrent, resulting in the entire Low voltage ride through failure
[0003] At present, the research on the low voltage ride through control strategy of the energy storage converter is mainly concentrated on the moment when the serious grid voltage drop fault occurs or is in progress, and the dynamic analysis and control strategy research on the recovery of the severe grid voltage drop fault are relatively few.
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[0053] In order to verify the effectiveness of the proposed control method, the typical LVRT recovery control method ( figure 1 ), improved low voltage ride through recovery control method ( figure 2 ) for simulation verification. When the voltage is normal, the energy storage converter is in the constant active power discharge mode, and the discharge power is 0.2pu; at 1.03 seconds, a serious voltage drop fault occurs in the simulated grid, and the grid voltage drops to 0pu. During the low voltage ride-through period, the energy storage The active current of the converter is controlled to be 0pu, and the reactive current is controlled to be 1.04pu; at 1.18 seconds, the recovery of a severe grid fault is simulated, and the grid voltage value returns to the state before the fault.
[0054] image 3 In order to adopt the typical low voltage ride through recovery control method, the modulation degree M of the energy storage converter and the output current response curve are a...
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The invention relates to a regulator saturation prevention control method for an energy storage converter during low-voltage ride-through recovery, and belongs to the technical field of power electronics. The method comprises the steps of 1, reversely deducing a reactive current allowable maximum value when a regulator is close to saturation according to a current active current given value, a modulation degree output maximum value and a direct-current side voltage; and 2, if the modulation degree reaches the maximum value, enabling the modulation degree regulator to regulate the reactive current given value, and enabling the energy storage converter to quit a saturation state. According to the invention, the regulator saturation condition of the energy storage converter can be effectivelyprevented when a serious power grid voltage drop fault is recovered, and overcurrent caused by the output instability of the energy storage converter is avoided.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and relates to an anti-saturation control method of a regulator for an energy storage converter during recovery from low voltage ride through. Background technique [0002] New energy sources such as photovoltaics and wind power have randomness and volatility. With the explosive access of new energy sources, it will seriously affect the power balance and stability of the power grid system. In order to solve this problem, more and more new energy power stations are equipped with energy storage systems to suppress power fluctuations and improve power quality. The energy storage system plays an important role in ensuring the stability of the new energy micro-grid system. Therefore, the national standard requires that the energy storage converter should have low-voltage ride-through capability, and it is required that the energy storage converter should have low-voltage ride-through capabil...
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IPC IPC(8): H02J3/16H02J3/48H02J3/50
CPCH02J3/16H02J3/48H02J3/50H02J2203/20Y02E40/30
Inventor 任亚葱干永革郝亚川赵聪魏立彬孙倩倩
Owner 中冶赛迪电气技术有限公司