A vsc-hvdc linear active disturbance rejection control method for improving system transient stability
A technology of VSC-HVDC and linear active disturbance rejection, which is applied in the field of VSC-HVDC linear active disturbance rejection control to improve the transient stability of the system. The effect of transient stability and strong robustness
Active Publication Date: 2022-01-18
SOUTH CHINA UNIV OF TECH
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However, the control strategy based on the energy function design uses the speed difference as the input signal, and the obtained control law is proportional to the speed difference of the synchronous generator set. When the speed difference is zero, the corresponding power angle difference is the extreme value in this oscillation period, but the additional control is zero, this control strategy cannot give full play to the adjustment ability of the controller
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[0017] This embodiment provides a VSC-HVDC linear active disturbance rejection control method for improving system transient stability. Based on LADRC, a VSC-HVDC linear active disturbance rejection controller for improving system transient stability is designed to drive different operating modes. The power system under the condition stabilizes at a new equilibrium point as soon as possible after a fault. The flowchart of the method is as figure 1 shown, including the following steps:
[0018] Step 1. According to the controllability of VSC-HVDC to synchronous generator sets, divide the controllable units corresponding to VSC-HVDC, and aggregate each controllable unit into an equivalent controllable unit; combine VSC-HVDC and its corresponding The equivalent controllable unit is established as an equivalent controllable system; the controllability is determined by the acceleration factor c, and the controllable unit is a collection of synchronous generating units with obvious...
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The invention discloses a VSC-HVDC linear active disturbance rejection control method for improving system transient stability, which includes the following steps: Step 1, according to the controllability of VSC-HVDC to synchronous generator sets, the corresponding controllable VSC-HVDC is divided. cluster, and each controllable cluster is aggregated into an equivalent controllable unit; the VSC-HVDC and its corresponding equivalent controllable units are established as an equivalent controllable system; step 2, according to the equivalent controllable system Based on the state equation of the linear active disturbance rejection theory, a third-order linear extended state observer and linear state feedback control law are designed, and the control output constraint logic and additional DC voltage over-limit control are added; step 3, in order to prevent the power system from normal The small fluctuation of the synchronous generating set during operation causes control maloperation, and a dead zone judgment block diagram with time delay is added in the control strategy as the starting condition of the controller. The control method is based on linear active disturbance rejection control, does not need a detailed model of the system, and has strong robustness to different operating modes of the system.
Description
technical field [0001] The invention relates to the field of power system transient stability control, in particular to a VSC-HVDC linear active disturbance rejection control method for improving system transient stability. Background technique [0002] Compared with the conventional HVDC technology based on grid commutation (abbreviated as LCC-HVDC), the flexible HVDC technology based on voltage source converter (abbreviated as VSC-HVDC) has incomparable advantages, such as independent control of active power And reactive power transmission, etc., the application of VSC-HVDC transmission technology has significant advantages. In recent years, VSC-HVDC transmission technology has developed rapidly. The maximum capacity of the flexible DC transmission project under construction in my country has reached 1000MW, and the highest voltage level has reached ±320kV. It may replace conventional DC in the future and become the mainstream technology of DC transmission. [0003] The c...
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365Y02E60/60
Inventor 黄振琳管霖黄济宇陈肖灿
Owner SOUTH CHINA UNIV OF TECH