Predictive power control method and system for pwm rectifier based on arbitrary period delay

A predictive power control and rectifier technology, applied in the field of power electronics, can solve the problems of unfavorable real-time control system, large software overhead, delay, etc.

CN105429484BActive Publication Date: 2018-07-06NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-07-06

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Abstract

The present invention discloses a PWM rectifier prediction power control method based on any period delay. The method comprises a step of calculating the active power and novel reactive power of a current time and predicting the power value of a next time, a step of constructing a target function related to a current time power value and a next time power value, and solving an optimal voltage vector which allows a target function value to be minimum, a step of calculating the action time of the optimal voltage vector, emitting the optimal voltage vector according to the action time of the optimal voltage vector in a control period, and supplementing other times by a zero vector, and a step of obtaining the driving signal of a switch tube. The invention also discloses a PWM rectifier prediction power control system based on any period delay. The invention provides the PWM rectifier prediction power control method and system based on any period delay, the adding of an additional power compensation value is not needed, the amount of calculation is small, the delay period id short, the dynamic response of the system is fast, and the efficient working of a PWM rectifier in the condition of grid voltage balance or unbalance can be realized.
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Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to a PWM rectifier predictive power control method and system based on arbitrary period delay. Background technique

[0002] Among the existing PWM rectifier control strategies, model predictive power control has attracted much attention due to its advantages of simple algorithm, fast dynamic response and flexible control. The definition of active power and reactive power in the traditional model predictive power control still uses the instantaneous power theory, that is, the instantaneous power theory under the ideal grid, but the actual grid voltage asymmetry will be caused by factors such as load imbalance and grid failure. If the traditional instantaneous power theory is still used for control, there will be large harmonics in the grid-side current, double-frequency fluctuations in power, and voltage fluctuations in the DC side, which seriously affect the control perfo...

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Embodiment Construction

[0069] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0070] refer to figure 1 As shown, it is a flow chart of an embodiment of the predictive power control method of a PWM rectifier based on an arbitrary period delay provided by the present invention. The PWM rectifier predictive power control method based on arbitrary period delay includes:

[0071] Step 1: Calculate the active power and new reactive power at the current moment according to the sampled grid voltage, grid current, and DC side voltage at any current moment, and predict the power value at the next moment;

[0072] Step 2: Construct an objective function related to the power value at the current moment and the power value at the next moment, and solve the optimal voltage vector that minimizes the objective fu...