A Nonlinear Control Method for Stratified Access UHVDC Transmission System

An ultra-high voltage DC, non-linear control technology, applied in the direction of power transmission and AC network, can solve problems such as unsatisfactory control effect, deterioration of system performance, inability to guarantee control effect, etc., to achieve small state change, improve performance and stable operation , the effect of short response time

Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In the case of large disturbances, the control effect of the traditional method is not ideal, and it cannot guarantee that the control action always aims at the optimal performance of the entire system, and even deteriorates the system performance.

Method used

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  • A Nonlinear Control Method for Stratified Access UHVDC Transmission System
  • A Nonlinear Control Method for Stratified Access UHVDC Transmission System
  • A Nonlinear Control Method for Stratified Access UHVDC Transmission System

Examples

Experimental program
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Effect test

Embodiment

[0074] see figure 1 , the controllers designed by the non-linear control method for receiving end hierarchically connected to UHVDC transmission system include: rectifier-side controller and inverter-side high-end and low-end controllers; rectifier-side controller includes constant current control, constant voltage control and Transformer tap control, inverter side high-end and low-end controllers include high-end current control, high-end arc extinguishing angle control, high-end constant voltage control, high-end transformer tap control, low-end current control, low-end arc-extinguishing angle control, low-end Constant voltage control, low-end transformer tap control and high-low end valve bank voltage balance control.

[0075] (1) Accurate linearization

[0076] see figure 2 , first establish the equivalent circuit diagram of the layered access UHVDC transmission system. Since the inverter side is connected to two AC systems in layers, considering the different voltage ...

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Abstract

The invention discloses a nonlinear control method for a layered access extra-high voltage direct current transmission system, comprising the following steps: according to equipment parameters and control system parameters of an extra-high voltage direct current transmission system of a receiving-end layered access alternating current power grid, establishing a state equation and an output equation of the extra-high voltage direct current transmission system of the receiving-end layered access alternating current power grid; selecting coordinate transformation meeting a diffeomorphism condition to carry out accurate linearization on the state equation; solving a Riccati equation corresponding to the linear system according to an optimization principle in the linear system; according to optimal pre-control of solving, forming an optimal control law of the layered access ultra-high voltage direct current transmission system, and optimizing state feedback so as to realize nonlinear control of rectifying side constant current and inverter side constant extinction angle. According to the nonlinear control method in the invention, accurate control of the rectifying side constant currentand the inverter side constant extinction angle and dynamic response characteristics of a polar layer and a valve layer in the direct current control system are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of ultra-high voltage direct current transmission control, and in particular relates to a nonlinear control method for layered access to an ultra-high voltage direct current transmission system. Background technique [0002] At present, the ±1100 kV DC transmission technology is the transmission technology with the highest voltage level, the largest capacity and the longest distance in the world, with a distance of 3000-5000 kilometers and a transmission capacity of 12 million kilowatts. The core technology for base ultra-long-distance, ultra-large-scale power transmission and interconnection with neighboring countries. [0003] In DC transmission technology, the DC control and protection system controls the whole process of AC-DC power conversion and DC power transmission. The main control and additional control of DC transmission projects are mostly designed based on the linear control theory of single in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 余芳郭洁邓军波李江涛吴玉颖余飞宏
Owner XI AN JIAOTONG UNIV
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