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H-bridge cascade type STATCOM control system based on model prediction

A control system and model prediction technology, applied in the direction of output power conversion devices, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as low calculation efficiency, large calculation amount, and affecting real-time control

Inactive Publication Date: 2015-08-19
SHANXI LUAN MINING GRP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a H-bridge cascaded STATCOM control system based on model prediction, which solves the problems of large amount of calculation, low calculation efficiency and affecting real-time control of traditional predictive control algorithms

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  • H-bridge cascade type STATCOM control system based on model prediction
  • H-bridge cascade type STATCOM control system based on model prediction
  • H-bridge cascade type STATCOM control system based on model prediction

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Embodiment 1

[0051] Embodiment 1: the concrete realization steps of this scheme are:

[0052] Step 1. Sampling the output voltage of the converter (v ao , v bo , v co ), grid voltage (e a 、e b 、e c ), converter compensation current (i a i b i c ), and compare it with the reference current obtained in the detection link respectively transformed into the αβ coordinate system to get (v α , v β ), (e α 、e β ), (i α i β ), According to the topological structure of the main circuit, the mathematical model of the H-bridge STATCOM in the αβ coordinate system is obtained, and the prediction model of the converter compensation current is obtained after discretization;

[0053] Step 2. Predict the reference current, and establish the value function of current tracking control in combination with the compensation current obtained in Step 1;

[0054]Step 3. Determine the current sampling period inverter output voltage vector and its surrounding six vectors as the optimization set of t...

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Abstract

The invention provides an H-bridge cascade type STATCOM control system based on model prediction, and belongs to H-bridge cascade type STATCOM control systems. Firstly, current converter output voltage, power grid voltage and current converter compensation current are sampled, the sampled current converter output voltage, power grid voltage and current converter compensation current and reference current obtained in a detection link are respectively transformed to an alpha-beta coordinate system, and a prediction model of current converter compensation current is acquired after discretization; secondly, reference current is predicted, and a value function for current tracking control is established in combination with compensation current obtained in the step one; thirdly, an inverter output voltage vector and peripheral six vectors of the current sampling period are confirmed to act as an optimizing set for the output voltage vector of the next sampling period; and fourthly, compensation current tracking control value function optimizing is performed according to the step two and the step three so that the output voltage vector of the next sampling period is confirmed and the switching state of the next period is obtained, and vector screening is performed in combination with DC side capacitor voltage control when redundant vectors are generated. Realization is easy, the hardware requirements are reduced and system response speed is increased.

Description

technical field [0001] The invention relates to an H-bridge cascaded static synchronous compensator (Static Synchronous Compensator, STATCOM) control system, in particular to an H-bridge cascaded STATCOM control system based on model prediction. Background technique [0002] The H-bridge cascaded STATCOM replaces the traditional STATCOM converter with several cascaded H-bridge units to realize its application in high-voltage and high-power occasions. Because of its modularity, the H-bridge cascaded STATCOM facilitates redundant design and fast troubleshooting. The cascading characteristics of its modular units also increase the number of output levels of the device, effectively reducing the harmonic distortion rate of the output voltage. [0003] The control of H-bridge cascaded STATCOM can be realized not only by carrier-shift equal modulation method, but also by predictive control algorithm. In the case of a large number of modules, the former will face problems such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02J3/18Y02B70/10
Inventor 周娟裴建勋王伟林赵丽燕付一春王福均高超绪朱玉振董浩刘刚唐慧英毛海港
Owner SHANXI LUAN MINING GRP
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