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Electric spring topological structure implemented based on current source type inverter and control method of electric spring topological structure

A power spring, topology technology, applied in AC network to reduce harmonics/ripple, harmonic reduction device, single-network parallel feeding arrangement, etc. Electricity requirements, etc.

Active Publication Date: 2015-12-09
SOUTHEAST UNIV
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Problems solved by technology

Taking the newly proposed phase control algorithm based on proportional resonant controller as an example, when the grid voltage output by new energy generation is distorted, the distortion of the key load voltage of the controlled object will also be distorted, and the total harmonic content on it will change with the As the degree of grid distortion deepens and increases, it cannot meet the power demand of key loads in serious cases

Method used

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  • Electric spring topological structure implemented based on current source type inverter and control method of electric spring topological structure
  • Electric spring topological structure implemented based on current source type inverter and control method of electric spring topological structure
  • Electric spring topological structure implemented based on current source type inverter and control method of electric spring topological structure

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Embodiment Construction

[0037] The present invention will be further explained below in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, a power spring topology based on current source inverter, including single-phase current source inverter, filter capacitor C f . The input end of the single-phase current source inverter is connected to the DC power supply, and the filter capacitor C f Parallel at the output end of the single-phase current source inverter; the key load Z 2 connected to the filter capacitor C f Between one end of the terminal and the common ground, the non-critical load Z 3 connected to the filter capacitor C f Between the other end and the public ground; the positive output end of the new energy power generation system is connected to the key load Z 2 connected to the filter capacitor C f Connected public terminal, the negative output terminal of the new energy power generation system is connected to the public ground; the positive output termin...

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Abstract

The invention discloses an electric spring topological structure implemented based on a current source type inverter and a control method of the electric spring topological structure. According to the control method, a direct current control and harmonic suppression method is adopted; and when distortion occurs in the output current of a new energy power generation system, the current of a key load can be enabled to be pure sine by an electric spring (ES), a given value can be accurately traced, and the harmonic current is forced to flow into the ES through control. By the electric spring topological structure implemented based on the current source type inverter and the control method of the electric spring topological structure, the harmonic components of the voltage and the current of the key load can be effectively suppressed on the condition of high harmonic content in a power grid, and the sine degree of the key load is improved and the valid values of the voltage and the current of the key load are enabled to be constant.

Description

technical field [0001] The invention belongs to the technical field of smart grid operation control, and relates to a power spring topology realized based on a current source inverter and a control method thereof. Background technique [0002] The traditional operation mode of the power system is still that the demand determines the power supply, which requires the power company to accurately predict the user's demand. Due to the intermittency and instability of renewable energy such as wind energy and solar energy, and with the gradual increase of its power generation and grid-connected capacity, the difficulty of the above prediction is gradually increasing, and the impact on the power system is becoming more and more obvious. For the interstitial problem of renewable energy, using energy storage devices to offset the mismatch between power generation and power consumption is one of the effective solutions. However, these energy storage devices increase the cost. [0003...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCY02E40/40
Inventor 程明王青松王嘉楠
Owner SOUTHEAST UNIV
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