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An electric spring topology and its control method

A power spring and topology technology, applied in the field of smart grid control, can solve the problems of ES not being able to play a role, and achieve the effects of easy understanding and implementation, high practicability and wide application prospects

Active Publication Date: 2017-06-09
SOUTHEAST UNIV
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Problems solved by technology

For example, in the case where the amplitude of the voltage increases with the increase of the generated power, the current ES cannot function

Method used

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  • An electric spring topology and its control method
  • An electric spring topology and its control method
  • An electric spring topology and its control method

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Embodiment Construction

[0034] The present invention will be further explained below in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown, a power spring topology, which outputs single-phase power-frequency alternating current, includes a single-phase voltage source inverter, an LC low-pass filter and a single-phase isolation transformer. The key load is connected in parallel between the output terminals of the single-phase grid for new energy power generation, the primary coil of the single-phase isolation transformer for non-critical loads is connected in parallel between the output terminals of the single-phase grid for new energy power generation, and the filter capacitor of the LC low-pass filter C and the secondary coil of the single-phase isolation transformer are connected in parallel between the output ends of the single-phase grid for new energy power generation. In this topology, the connection ends of the two windings of the transformer are opposite ends. On...

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Abstract

The invention discloses a topology of a power spring and a control method thereof. With the increase of grid-connected capacity of renewable energy such as wind energy and solar energy, the stability of the power system is facing severe challenges. When large-scale distributed renewable energy generation is connected to the grid, the possibility of grid collapse, especially microgrids, gradually increases . Power springs are mainly proposed to address the instability of renewable energy generation in microgrids. The power spring topology structure and control strategy proposed by the present invention can not only ensure that the key load voltage is stable and at the same time transfer the fluctuation of the input voltage to the non-critical load, but also ensure the energy consumption of the non-critical load and the input voltage. The trend of change remains the same. The monotonic variation relationship between the active power and the input voltage realized by the present invention cannot be realized by the existing power spring. Therefore, the present invention is more practical in the case where the magnitude of the voltage increases as the generated power increases.

Description

technical field [0001] The invention belongs to the technical field of smart grid control, and relates to a topology of an electric spring and a control method thereof. Background technique [0002] At present, the operation mode of the power system is still that the demand determines the power supply, which requires the power supply side to accurately predict the user's demand. Renewable energy such as wind energy has the disadvantages of intermittency and instability. With the increase of its grid-connected capacity year by year, its impact on the power system is becoming more and more obvious, making the above prediction more difficult. For the intermittent problem of wind energy, using energy storage devices such as batteries, superconductors or high-speed flywheels to offset the mismatch between power generation and demand is one of the effective solutions. However, these energy storage devices add significant cost, and reliable operation of the energy storage devices ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 程明王青松
Owner SOUTHEAST UNIV
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