Abstract
In order to minimize the harmonic distortion rate of the current at the common coupling point, this paper proposes a coordinated allocation strategy of harmonic compensation capacity considering the performance of active power filters (APF). On the premise of proportional distribution of harmonic compensation capacity, the harmonic compensation rate of each APF is considered, and the harmonic current value of each APF to be compensated is obtained. At the same time, the communication topology is introduced. Each APF takes into account the compensation ability of other APFs. Finally, three APFs with different capacity and performance are configured at the harmonic source to suppress the same harmonic source, and the harmonic distortion rate is reduced to 1.73%. The simulation results show that the strategy can effectively improve the compensation capability of the multiple APF cascaded system to the power grid without increasing the installed capacity.
Highlights
With the grid connection of a large number of distributed new energy sources and the development and application of power electronic equipment, the power quality of the power grid has declined, and the harmonic pollution has become increasingly serious [1–3]
With the development of power electronic technology, active power filters (APF) has become the dominant power grid harmonic control, (PCC) for harmonic current detection, through the converter to generate the current with the same amplitude and reverse harmonic current for harmonic dynamic compensation [4–6]
In order to verify the effectiveness and feasibility of the command power distribution strategy considering APF performance mentioned in this paper, the three-phase two-level active power filter is used for research
Summary
With the grid connection of a large number of distributed new energy sources and the development and application of power electronic equipment, the power quality of the power grid has declined, and the harmonic pollution has become increasingly serious [1–3]. The command current takes into account the performance of each APF based on the capacity proportion It realizes that when harmonic compensation is made to the power grid, the APF output with better performance is more. The communication topology is used to introduce the performance weight factor the system can adjust the weight of the performance distribution to occupy the command current, so that the system can get lower harmonic distortion rate after compensation. This method is suitable for networks with various nonlinear loads. The results of the example verify the effectiveness of the proposed scheme, find out the optimal instruction current distribution, while meeting the requirements of network access, it can reduce the installation capacity of the combined APF, and make APF have better economic and compensation capability
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