Three-phase energy storage converter stability control method and system under serious short-circuit fault of power grid
A stable control method and short-circuit fault technology, applied in the direction of converting AC power input to DC power output, electrical components, AC network load balancing, etc., can solve problems such as instability, not considering energy storage converter control, etc. The ability to resist disturbance, reduce the risk of transient instability, enhance the effect of transient stability
Pending Publication Date: 2022-07-29
HUNAN UNIV
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[0004] Invention patent application CN111200292A discloses a method and system for parallel control of energy storage converters, which eliminates the imbalance of separate sampling and outer loop calculation errors, but does not consider the large disturbance stability of energy storage converters in power grid short-circuit faults In the case of serious short-circuit faults in the power grid, there may be a risk of instability
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[0031] like figure 1 As shown, the system structure diagram of the three-phase energy storage converter stabilization control method under the severe short-circuit fault of the power grid according to the embodiment of the present invention includes two parts: the main circuit structure diagram and the control block diagram. Main circuit structure diagram There are batteries and capacitors C on the DC side dc , and S 1 ~S 6 Six switch tubes, the AC side is provided with a filter, wherein the filter includes a filter inductor L f , the filter capacitor C f and damping resistor R f , through the grid equivalent line impedance Rg , L g connected to the grid; i abc is the filter inductor current, u pabc is the grid-connected voltage, i gabc is the grid-connected current, u gabc is the grid voltage. In the control block diagram, the sampled inductor current i abc , the grid connection point voltage u pabc After abc / dq coordinate transformation, the dq component i of the...
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The invention discloses a stable control method and system for a three-phase energy storage converter under a serious short-circuit fault of a power grid, and the interference resistance of an energy storage converter system is enhanced by converting a control mode. When the power grid has a serious short-circuit fault, control is switched to direct given fault active and reactive current control, certain reactive current is provided, and the voltage of a grid-connected point is supported. And according to the voltage drop degree of the power grid and the phase-locked loop switching control mode, the number of system intersections after a fault is increased, and the transient stability of the energy storage converter is improved.
Description
technical field [0001] The invention relates to the field of transient stability control of energy storage converters, in particular to a three-phase energy storage converter stability control method and system under severe short-circuit faults of power grids. Background technique [0002] Energy storage converters play an important role in stabilizing output fluctuations of new energy sources, shaving peaks and filling valleys, etc. However, when a high proportion of asynchronous power sources such as energy storage converters are connected to the power grid, the proportion of asynchronous power sources in the power system continues to increase , the power system is gradually becoming power electronic, and at the same time, many related transient instability problems are caused. The transient stability problem of energy storage converters is different from the research on small disturbance stability problems based on linear theory. It belongs to the category of large distur...
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Login to View More IPC IPC(8): H02J3/16H02J3/32H02M7/219H02M1/12
CPCH02J3/16H02J3/32H02M7/219H02M1/12
Inventor 陈燕东张雨祥伍文华谢志为莫必祥何志兴王自力张松徐元璨曹世骧
Owner HUNAN UNIV