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Grid-connected converter control method

A control method and converter technology, applied to AC network circuits, single-network parallel feeding arrangements, and AC networks to reduce harmonics/ripples, etc., can solve problems such as high cost, system resonance, and limited governance range , to achieve the effect of improving the utilization rate, minimizing the harmonic level of the node voltage, and reducing the treatment cost

Active Publication Date: 2018-10-12
SHENZHEN POWER SUPPLY BUREAU
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Problems solved by technology

[0003] Traditional harmonic control devices are divided into two types: passive filters and active filters. Passive filters have a simple structure, but their compensation characteristics are affected by the impedance of the grid, and they tend to resonate with the system during operation, and can only compensate for fixed Some harmonics; based on power electronics technology, the active filter can compensate the harmonic current of a specific line by taking the harmonic current as the compensation object. Promote apps within

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Embodiment Construction

[0040] The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented.

[0041] Please refer to figure 1 As shown, an embodiment of the present invention provides a method for controlling a grid-connected converter, including the following steps:

[0042] Step S1, establishing a model of the grid-connected converter, and calculating its output transfer function;

[0043] Step S2, determining the harmonic frequency range that needs to be suppressed, setting the corresponding PI parameters, initial temperature, initial value of virtual resistance, value range of virtual resistance value, number of iteration steps and stop criterion;

[0044] Step S3, taking the filter effect function to be optimized as the objective function, using the virtual resistance as the decision variable, and taking the annealing function and the annealing end criterion as constraints to establish ...

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Abstract

The invention discloses a grid-connected converter control method, comprising the following steps: step S1, establishing a model of a grid-connected converter, and calculating to obtain an output transfer function thereof; and step S2, determining a harmonic frequency range to be suppressed, setting corresponding PI parameters, initial temperature, virtual resistor initial value, virtual resistorresistance-value data range, iteration step and stop criterion; step S3, establishing an optimization model of the grid-connected converter by taking the filter effect function to be optimized as theobjective function, the virtual resistor resistance-value as the decision variable, the annealing function and the annealing end criterion as constraints; and step S4, performing optimizing and solving on the virtual resistor of the optimized model to determine the resistance-value of the virtual resistor. By applying the grid-connected converter control method, the grid-connected converter is enabled to have the output active power and the harmonic suppression function at the same time, the utilization ratio of the traditional grid-connected converter is improved, and the harmonic control cost of the grid is reduced.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a control method for a grid-connected converter. Background technique [0002] Although a large number of distributed power sources connected to the distribution network can effectively alleviate the local congestion problem of the power grid and realize functions such as on-site compensation of active and reactive power, but due to the intermittent and uncertain output power of the distributed power generation system, and The use of a large number of power electronic converters has brought serious harmonic pollution problems to the traditional distribution network. There are also a large number of nonlinear loads in the distributed power grid, which aggravates the problems of harmonic pollution and reactive power shortage. Harmonic pollution will affect the normal operation of power system devices and even the entire distribution network system, and must be treated. [0...

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/38H02J2203/20Y02E40/40
Inventor 张华赢朱正国曾江欧阳森刘顺桂孙杰
Owner SHENZHEN POWER SUPPLY BUREAU
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