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Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system

A bidirectional converter, energy storage unit technology, applied in AC network to reduce harmonics/ripple, harmonic reduction device, AC network load balancing and other directions, can solve problems such as high-order harmonic pollution

Inactive Publication Date: 2012-09-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a harmonic suppression method for the bidirectional converter of the energy storage unit in the wind-solar-storage system, so as to suppress the high-order harmonic pollution problem caused by the nonlinear factors of the bidirectional converter

Method used

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  • Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system
  • Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system
  • Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system

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Embodiment

[0052] like figure 1 As shown, in this embodiment, the wind-solar-storage system is composed of a wind power generation system, a solar photovoltaic power generation system and an energy storage unit, wherein the wind power generation system and the solar photovoltaic power generation connected to the power grid; the energy storage unit is mainly to suppress the high-frequency fluctuations in the output of the wind power generation system and the solar photovoltaic power generation system, improve the power quality output by the wind power storage system, and connect to the power grid through a bidirectional converter . The energy management system is the control center of the wind-solar-storage system, and controls them through optical fiber, wind power generation system, solar photovoltaic power generation system and energy storage unit.

[0053] figure 2 It is a control schematic diagram of the bidirectional converter of the energy storage unit applying the harmonic supp...

example

[0105] When discharging at constant power, after using the harmonic suppression strategy, compared with before harmonic suppression, the content of the fifth harmonic and the seventh harmonic are significantly suppressed, and the THD is also reduced, without affecting the content of other harmonics. When the energy storage unit performs discharge control through the bidirectional converter after the harmonic suppression algorithm, the current harmonics are significantly suppressed.

[0106] When charging at constant power, after using the harmonic suppression strategy, compared with before harmonic suppression, the content of the fifth harmonic and the seventh harmonic are significantly suppressed, and the THD is also reduced, without affecting the content of other harmonics. When the energy storage unit is charged and controlled through the bidirectional converter after the harmonic suppression algorithm, the current harmonics are significantly suppressed.

[0107] It can...

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Abstract

The invention discloses a harmonic suppression method of a bidirectional converter of an energy accumulation unit in a wind and light accumulation system. The harmonic suppression method comprises the steps of: extracting a quintic harmonic voltage and a septic harmonic voltage and a current of a power grid; then figuring out corresponding voltage compensation quantities of v alpha 5th, v beta 5th, v alpha 7th and v beta 7th; adding voltage quantities v alpha and v beta obtained through decoupling control with a current of an inner ring to obtain output reference quantities V alpha and V beta; and carrying out SVPWM (Space Vector Pulse Width Modulation) on the output reference quantities V alpha and V beta to obtain switching signals of switching on and switching of a controllable switch tube of a three-phase bridge arm of a bidirectional converter. Because the quintic harmonic and the septic harmonic are taken into account in control quantities, the problem of pollution of high-order harmonics due to nonlinear factors of the bidirectional converter is eliminated. The harmonic suppression method is suitable for a harmonic suppression process of the bidirectional converter used by the energy accumulation unit in renewable energy source systems such as the wind and light accumulation system, and can achieve better harmonic suppression effect under the condition of no need of additional hardware input.

Description

technical field [0001] The invention belongs to the technical field of power grid connection in the electric power industry, and more specifically relates to a method for suppressing harmonics caused by nonlinear factors of bidirectional converters of energy storage units in a wind-solar-storage system. Background technique [0002] On the one hand, the wind-solar-storage system uses the complementary characteristics of wind energy and solar energy to generate wind-solar complementary power generation, which reduces the adverse effects of wind energy and solar energy intermittent and random on single energy power generation; on the other hand, combined with energy storage technology, through the energy storage unit Charge and discharge control can suppress power fluctuations to a greater extent and improve the power quality of power generation. [0003] The application of energy storage technology provides a solution for smoothing the output power of distributed generation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/32
CPCY02E40/40
Inventor 辛晓帅邹见效舒军徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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