TCSC (thyristor controlled series capacitor) control method and system based on process neural network
A process neural network and control method technology, applied in the field of TCSC (that is, controlled series compensation) control method and system based on process neural network, can solve the problem that the neural network model is not considered, so as to improve stability and suppress low-frequency oscillation. , increase the damping effect
Inactive Publication Date: 2014-01-08
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology
However, so far, the neural network models established for various practical systems have not considered the time-related change process, and all take some static input quantities, and each physical quantity in the power system usually changes with time. , for example, the mechanical power will change with the change of the load, and the power angle of the generator is also a function of time. Therefore, considering the process of each physical quantity changing with time, establish a model of the power system, and design the equivalent impedance of the TCSC control strategy is an important research topic
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[0031] In the present invention, the TCSC control system based on the process neural network is as figure 1As shown, the single-machine infinite power system with TCSC is as follows Figure 4 As shown, where: G is the generator, VS is the bus voltage of the infinite system, Vt is the terminal voltage of the generator, Xe is the impedance of the TCSC, T is the transformer, AC and SC are the bus, L1 and L2 are the transmission lines. In this embodiment, the parameters (per unit value representation) are selected as follows:
[0032] The transformer reactance is X T =0.1, the line reactance of transmission line L1 is X l1 =0.24, the line reactance of transmission line L2 is X l2 =0.24, the d-axis steady-state reactance of the generator is X d = 1.2, generator d-axis transient reactance is X d '=0.2, the generator q-axis steady-state reactance is X q =1.2, generator q-axis transient reactance is X q '=0.1, the inertia time constant of the generator rotor is T J =15.0, the ...
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The invention provides a TCSC (thyristor controlled series capacitor) control method and a TCSC control system based on a process neural network. An inverse system model comprising a TCSC one-machine infinitely great electric power system is constructed by adopting the process neural network, in addition, a Fourier analysis method and the DSP (digital signal processing) control are adopted, the sum of steady state impedance of TCSC at each harmonic frequency and base waves is used as the equivalent impedance of the TCSC, each process changed along with the time is sufficiently considered, the typical linear control is combined, the measurement and the processing are carried out on the attack angle of a power generator, control signals are generated for controlling the triggering angle of the TCSC, the equivalent impedance of a power transmission line is flexibly, continuously and smoothly regulated in a large range, the damping of the system is increased, and the attack angle stable value of the power generator is controlled, so the low-frequency oscillation of the electric power system is effectively inhabited, and the stability of the system is improved.
Description
technical field [0001] The invention belongs to the field of power system control, and relates to a process neural network-based TCSC (controllable series compensation) control method and system. Background technique [0002] The power system is a nonlinear complex system, and the application of power electronic devices has aggravated the nonlinearity of the system. The flexible AC transmission technology FACTS is used to enhance the stability of the system, thereby improving the transmission capacity of the line as much as possible. research hotspots in the field. TCSC (Controllable Series Compensation) is a new type of controller that has been studied more and has been practically applied after the FACTS concept was proposed. When the system is running in a steady state, if the power angle of the generator decreases or increases due to interference, and the angular velocity and angular acceleration increase or decrease, by adjusting the firing angle of the thyristor of th...
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Login to View More IPC IPC(8): H02J3/24
CPCY02E40/10
Inventor 贺超英
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY