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PCS active and reactive power control system and control method

A technology of power control and controller, which is applied in PCS active and reactive power control system and control field, can solve the problems of increasing the number of PI controllers, multi-voltage and current sensors, and inconvenient engineering application, so as to achieve simplified control strategy, simple control structure, The effect of high sine degree

Active Publication Date: 2016-04-06
STATE GRID CORP OF CHINA +2
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Problems solved by technology

For this reason, the PCS model will become a high-level mathematical model. The traditional double closed-loop control of power outer loop and current inner loop is not only complicated to control, but also requires more voltage and current sensors, and increases the number of PI controllers, making debugging difficult. , engineering application is quite inconvenient

Method used

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  • PCS active and reactive power control system and control method
  • PCS active and reactive power control system and control method
  • PCS active and reactive power control system and control method

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Embodiment Construction

[0045] see figure 1 , PCS active and reactive power control system, including current generator, phase-locked loop, grid-side voltage converter, three-phase current converter, voltage transformer, current transformer, first proportional-integral controller, second proportional-integral controller , coordinate transformer and SVPWM generator;

[0046] The voltage transformer is connected to the high-voltage side of the isolation transformer of the power grid, and the grid-side voltage converter and the phase-locked loop are both connected to the voltage transformer; the grid-side voltage converter and the phase-locked loop are also connected interconnected;

[0047] The current transformer is connected to the output side of the PCS inverter of the grid, and the three-phase current converter is connected to the current transformer; the three-phase current converter and the phase-locked loop are also connected to each other;

[0048] The input terminal of the current generator ...

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Abstract

Provided are a PCS active and reactive control system and control method. The control system comprises a current generator, a phase-locked loop, a grid-side voltage converter, a triphase current converter, a voltage transformer, a current transformer, two proportional integral controllers, a coordinate converter and a SVPWM generator. A PWM control signal for controlling a power switch tube of a power grid is generated through these components so as to realize PCS active and reactive decoupling control. The control method comprises model reduction, coordinate conversion, outer loop current control and SVPWM modulation. The PCS active and reactive control system and control method enable the PCS to stabilize the output or to absorb specified active power and reactive power, so as to realize bidirectional flow of energy.

Description

technical field [0001] The invention relates to a PCS active and reactive power control system and a control method. Background technique [0002] As we all know, grid connection and transmission and distribution technology of intermittent power sources such as wind energy and solar energy is one of the development themes in the energy field at present. Correspondingly, the application of battery energy storage systems has attracted widespread attention. An important part of the battery energy storage system is PCS (Power Conversion System, energy conversion system). PCS devices have been widely used in distributed power generation technologies such as solar energy and wind energy, and are gradually favored in energy storage systems with small-capacity bidirectional power transmission such as flywheel energy storage, supercapacitors, and battery energy storage. Through PCS, the two-way energy transfer between the DC battery of the battery energy storage system and the AC g...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCH02J3/1807H02J3/01Y02E40/30Y02E40/40
Inventor 王斌赵丰富陈晓东郑凤英马玉程兰芳程建洲郑天文崔文琦王捷
Owner STATE GRID CORP OF CHINA
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