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Active damping control method of LCL grid-connected inverter under static coordinate

A static coordinate system, damping control technology, applied in the direction of irreversible DC power input conversion to AC power output, single-grid parallel feeding arrangement, output power conversion device, etc., can solve the problem that the grid side current unity power factor cannot be achieved control, undisclosed active damping network design methods, increasing algorithm complexity, etc.

Inactive Publication Date: 2016-05-25
SHANGHAI POWER EQUIP RES INST +1
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Problems solved by technology

However, none of the above methods disclosed the design method of the active damping network there, and the current control of the feedback converter side cannot realize the unit power factor control of the grid side current. The voltage and current are respectively subjected to Parker transformation and a voltage anti-Pike transformation, which increases the complexity of the algorithm

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  • Active damping control method of LCL grid-connected inverter under static coordinate
  • Active damping control method of LCL grid-connected inverter under static coordinate
  • Active damping control method of LCL grid-connected inverter under static coordinate

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Embodiment Construction

[0071] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0072] The method of the present invention includes seven steps in total, including: 1. Grid voltage detection and coordinate transformation; 2. Converter side current detection and coordinate transformation; 3. DC voltage control to obtain the DC reference value of active current; 4. Converter 5. Control of AC current; 6. Obtain the compensation value of inverter output voltage through active damping network; 7. Generation of voltage space vector; the specific steps are as follows:

[0073] Step 1: Sampling the two-phase grid line voltage through the grid voltage detection unit (6), obtaining the grid voltage vector component in the static coordinate system through the coordinate transformation formula from the grid line voltage to the two-phase static coordinate system, and obtaining the grid voltage by direct calculation The am...

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Abstract

The invention discloses an active damping control method of an LCL grid-connected inverter under a static coordinate. The active damping control method comprises seven steps of 1, detecting a grid voltage and carrying out coordinate conversion; 2, detecting a current of a converter side and carrying out coordinate conversion; 3, controlling a DC voltage to obtain a DC reference value of an active current; 4, calculating a two-phase current reference value of the converter side; 5, controlling an AC current; 6, obtaining a compensation value of an output voltage of the inverter through an active damping network; and 7, generating a voltage space vector. With the adoption of the active damping control method, damping control on a resonant peak of an LCL filter can be effectively achieved on the condition that no extra sensor is additionally arranged, moreover, the complexity of an algorithm is simplified, the requirement of the algorithm on a high-performance digital controller is reduced, the efficiency of a system is effectively improved, and the cost of the system is effectively reduced.

Description

technical field [0001] The invention relates to an active damping control method of an LCL grid-connected inverter in a static coordinate system, and belongs to the technical field of control of grid-connected PWM inverters. Background technique [0002] With the development of power electronics technology and the strict requirements of the power grid on the harmonic current injection of grid-connected inverters, LCL-type filters are used in grid-connected PWM inverters to replace L-type filters in photovoltaic power generation, wind power generation and It has been widely used in energy storage PCS system and other fields. [0003] As we all know, compared with the L-type filter, the LCL-type filter has better harmonic attenuation characteristics and can bring better harmonic suppression effect, so the LCL-type filter in the grid-connected inverter can effectively reduce The size and cost of the filter reduce the harmonic current content injected into the grid. However, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M1/12H02J3/38
CPCH02M7/48H02J3/38H02M1/126
Inventor 李磊
Owner SHANGHAI POWER EQUIP RES INST
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