LCL filtering based voltage type active rectifier steady control system and method

A stable control and rectifier technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as large inductance parameters, weakened ability to attenuate harmonics, and unfavorable filter integration.

CN101141100AInactive Publication Date: 2008-03-12TSINGHUA UNIV
0 Cites 61 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-03-12
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The utility model relates to a voltage type source rectifier stable control system and method based on LCL filter wave, belonging to the source rectifying technical range of electronic technology. The system comprises a DC voltage control cell, a current control cell, an active damp control cell and a voltage space vector generating cell. the utility model produces six PWM signals to gain the current signal of the filter wave capacitor branch directly or indirectly, outputs the reference value of the damp voltage and achieves the stable control on the system. The method provides an adjustable sine control on the DC voltage output and input current through the active damp vector control of the voltage type source rectifier stable control system, the damp voltage reference value outputted by the active damp vector control cell, and the network voltage to execute summation operation. The utility model has the advantages of controllable DC voltage, low aberrance rate of the network input current, high power factor, satisfying the requirement of energy double-redirection flowing, and achieving the stability of the system without increasing the quantity of hardware damp resistance.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical scope of active rectification in power electronic technology, and in particular relates to a voltage-type active rectifier stability control system and method based on LCL filtering. More specifically, the present invention relates to a voltage space vector control method with an active damping unit that can be applied to an inductor-capacitor-inductor (LCL) filtered voltage-type active rectifier. The active damping unit realizes the stability of the unstable system stability control. Background technique

[0002] Active rectification technology is an important field in the development of power electronics technology. Voltage source active rectifier (Voltage Source active Rectifier) ​​has the advantages of controllable DC voltage, low input current distortion rate at the grid side, high power factor and bidirectional energy flow, etc. It is used in renewable energy grid-connected power generation, hybrid parallel...

Examples

Embodiment Construction

[0056] The principle of implementation of the present invention will now be described in detail.

[0057] Since the filter capacitor C of the LCL filter f is very small, according to the impedance formula Z c =1 / (jωC f ), it can be seen that the filter capacitor is approximately an open circuit for low-frequency currents and a short-circuit for high-frequency currents. For power frequency current, its ω=100π, so the impedance of the filter capacitor is much larger than the network side inductance L g Large, similar to an open circuit state.

[0058] Remember L ∑ =L g +L, ignoring the loop resistance, the DC bus capacitance is C d , whose voltage is U dc , the load current is i L , the grid three-phase voltage is uga / gb / gc , grid current i ga / gb / gc , and the three-phase current i of the converter side ia / ib / ic approximately equal. Write down the switching function of the rectifier bridge:

[0059]

[0060] According to the voltage / current balance equation:

[00...