Wide-area damping control method for DFIG and SSSC coordination power system

A power system, wide-area damping technology, applied in flexible AC transmission systems, circuit devices, AC network circuits, etc., can solve the problems of complex interconnected power grid characteristics, weakened oscillation suppression effect, limited damping, etc. The effect of power oscillation suppression capability and strong robustness

Active Publication Date: 2019-04-19
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +1
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  • Application Information

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Problems solved by technology

The proportion and capacity of DFIG and SSSC in the power grid are gradually increasing, which also makes the characteristics of the interconnected grid more complex, which brings great challenges to the analysis and suppression of power system power oscillation. Once power oscillation occurs, it will have a huge impact on the power system. , so how to improve the system damping characteristics and suppress power oscillation is worth studying
The traditional synchronous machine adopts the power system stabilizer (PSS) fo

Method used

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  • Wide-area damping control method for DFIG and SSSC coordination power system
  • Wide-area damping control method for DFIG and SSSC coordination power system
  • Wide-area damping control method for DFIG and SSSC coordination power system

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[0096] Example:

[0097] choose as Figure 7 Four-machine two-area system verification including DFIG and SSSC. The wind farm consists of 10 double-fed wind turbines with a rated capacity of 1.5MW. The capacity of SSSC is 100MVA, and the specific parameters are configured as follows: the fuzzy parameters in SSSC are Kp(s)=1 / (0.02s+1), Kq(s)=280 / (0.001s+1). Fuzzy sets are defined as: Negative Big (NB), Negative Small (NS), Zero (ZO), Positive Small (PS), Positive Big (PB). The damping control method combining DFIG and SSSC, the fuzzy control parameters of SSSC are Kp(s)=1 / (0.02s+1), Kq(s)=280 / (0.001s+1). The PSS parameters of DFIG are K=-50, T1=0.5, T2=0.2, T3=8, T4=2.4, Vsmin=-0.5, Vsmax=0.5.

[0098] Table 1 Fuzzy rule table

[0099]

[0100] Case 1: Comparison of different control strategies under large disturbance three-phase short circuit

[0101] Assume that a three-phase short-circuit fault occurs in 1s at the busbar 101 of the tie line, and the fault lasts for ...

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Abstract

The invention provides a wide-area damping control method for a DFIG and SSSC coordination power system and belongs to the technical field of power system interconnection grid damping control. The method comprises steps of firstly identifying the oscillation parameter of the system, determining the damping condition of the system and obtaining the oscillation frequency and damping ratio of the power system; secondly, selecting a wide-area input signal of the damping controller is selected; according to the damping ratio setting target, carrying out power oscillation suppression by using reactive modulation in the SSSC by combining the fuzzy control principle; providing the damping torque through a PI-based PSS link in the DFIG to perform the oscillation suppression; and then the coordinating the power oscillation suppression and oscillation suppression to achieve the power system wide area damping control. The simulation results show that the proposed method is simple and effective, and the proposed wide-area damping control has strong robustness and can effectively enhance the power oscillation suppression capability of the interconnected power grid.

Description

technical field [0001] The invention belongs to the technical field of damping control of power system interconnected grids, and in particular relates to a wide-area damping control method of a DFIG and SSSC coordinated power system. Background technique [0002] With the vigorous development of new energy power generation, a large number of wind power is connected to the grid, and the double-fed induction wind turbine (DFIG) is widely used. The problem brought about by this is that large-scale wind power is connected to the grid, which may cause a series of serious problems such as a large number of units being disconnected from the grid. , if not dealt with in a timely and effective manner, it will cause huge losses to the grid company and the wind farm. At the same time, the static synchronous series compensator (SSSC) can also provide voltage regulation for the power grid. The SSSC is connected in parallel at the outlet bus of the wind farm connected through the series c...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J3/002H02J2203/20Y02E40/10
Inventor 郝文波徐茂达
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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