A wide-area damping control method for power systems coordinated by dfig and sssc
A power system and wide-area damping technology, which is applied in flexible AC power transmission systems, circuit devices, AC network circuits, etc., can solve the problems of weakening oscillation suppression effects, complex interconnected grid characteristics, and limited damping, and achieve enhanced power oscillation suppression capabilities , the method is simple and effective, and the effect of strong robustness
Active Publication Date: 2022-05-10
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +1
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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) for damping control, which has been widely used. Some scholars also combine the PSS control link with DFIG or SSSC to provide damping alone. However, for the power grid containing DFIG and SSSC, if it can Additional damping, especially when DFIG or SSSC alone provides limited damping, may provide limited damping and weaken the oscillation suppression effect. Therefore, the coordinated wide-area damping control method of DFIG and SSSC can be used to provide damping for the system and suppress power oscillations. a new way
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[0099] 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.
[0100] Table 1 Fuzzy rule table
[0101]
[0102] Case 1: Comparison of different control strategies under large disturbance three-phase short circuit
[0103] Assume that a three-phase short-circuit fault occurs in 1s at the busbar 101 of the tie line, and the fault lasts for 0.2s. When both DF...
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A DFIG and SSSC coordinated power system wide-area damping control method belongs to the technical field of power system interconnection grid damping control. The present invention firstly identifies the system oscillation parameters to determine the system damping condition, and obtains the power system oscillation frequency and damping ratio, and secondly, selects the wide-area input signal of the damping controller. Then set the target according to the damping ratio. In SSSC, the fuzzy control principle is combined with reactive power modulation to suppress power oscillation; in DFIG, damping torque is provided through the PI-based PSS link to suppress oscillation, and then the two are coordinated to achieve power System wide area damping control. The simulation results show that the method is simple and effective, and the proposed wide-area damping control has strong robustness, and can effectively enhance the power oscillation suppression ability of the interconnected 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 power system coordinated by DFIG and SSSC. 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 SSSC can also provide voltage regulation for the power grid. The SSSC is connected in parallel at the outlet bus of the wind farm networked through the series compensation line, and the purpose of ...
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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