Control method and system for primary frequency modulation of wind storage system

A control method, a technology of system frequency, applied in the direction of reducing/preventing power oscillation, AC network circuits, electrical components, etc., can solve problems such as poor power distribution characteristics, ensure stable operation, prevent overcharging or deep discharge, and avoid cycling effect of current

Active Publication Date: 2021-04-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a control method and system for the primary frequency regulation of the wind storage system, aiming to solve the problem of poor power distribution characteristics in the primary frequency regulation of the existing wind storage system

Method used

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  • Control method and system for primary frequency modulation of wind storage system
  • Control method and system for primary frequency modulation of wind storage system
  • Control method and system for primary frequency modulation of wind storage system

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Embodiment

[0106] The parameter values ​​of the system are shown in Table 1:

[0107] Table 1

[0108] parameter value parameter value Fan rated power P B / MW

1.5MW Rotor inertia control coefficient K IR

0.1 Fan rated line voltage V B / kV

0.69kV communication weight a ij

10 System rated frequency f ref / Hz

50Hz SoC factor K PSoC,i , K ISoC,i

0.01,0.2 Stator resistance R s / pu.

2.40mΩ Fan DC side voltage V dc / kV

1.2kV Rotor resistance R r / pu.

1.69mΩ Fan DC side capacitance C dc / F

0.03F Stator inductance L s / pu.

2.343mH InductanceL / mH 10mH Rotor inductance L r / pu.

2.343mH Battery capacity C bat,1 / kWh

4kWh Exciting inductance L m / pu.

2.199mH Battery capacity C bat,2 / kWh

4kWh Stator to rotor turns ratio r 0.335 Battery capacity C bat,3 / kWh

2kWh Moment of inertia J / s 4.63s Battery capacity C bat,4 / kWh ...

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Abstract

The invention discloses a control method and system for primary frequency modulation of a wind storage system, and belongs to the technical field of electrical engineering. The system comprises bottom-layer doubly-fed induction generator DFIG vector control, energy storage system ESS double closed-loop control, upper-layer power consistency control and state of charge (SoC) consistency control. Normal operation of the fan and the energy storage system is guaranteed through bottom-layer control, and power distribution of the fan and the energy storage system is adjusted through upper-layer control; on the basis of power consistency control, energy storage equipment can adjust energy storage frequency modulation power output in real time according to different capacities of the energy storage equipment; reference power of the DFIG network side converter is adjusted based on an SoC consistency protocol, and output of all energy storage devices is adjusted according to the SoC on the premise that the energy storage devices are charged and discharged at the same time. Thus, the wind storage output power can be effectively adjusted in real time to stabilize the frequency, and stable operation of the wind power plant is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a control method and system for primary frequency modulation of a wind storage system. Background technique [0002] In recent years, energy storage has been rapidly developed and applied. In the power system including wind power, the frequency adjustment of the energy storage auxiliary system can realize the energy storage to absorb and release the active power, and its performance is stable, the control is flexible, and the response is fast. Therefore, in addition to utilizing the adjustment capability of the wind turbine itself, configuring a certain capacity of energy storage in the wind turbine or wind farm can assist the wind power to participate in the frequency adjustment process of the system, and can avoid the secondary reduction of the system frequency caused by the inertial control of the wind turbine rotor. question. [0003] When ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/241
Inventor 陈霞陈思源杨丘帆周建宇文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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