Method for improving power grid frequency stability based on sliding mode control
A grid frequency and stability technology, applied in the direction of reducing/preventing power oscillation, can solve the problem of not being able to better control the grid frequency, and achieve the effect of fast control rate and strong anti-interference ability of the system
Active Publication Date: 2020-04-03
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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Problems solved by technology
[0004] Most of the methods for stabilizing the grid frequency use the PID control method. At present, a large number of nonlinear loads are put into use, and the traditional PID control cannot better control the grid frequency.
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example
[0065]
[0066] B=[0 0 13.021 0] T ,
[0067] C=[-6 0 0 0] T ,
[0068]
[0069] K=[1.4988 1.9918 0.6374 0.7199] T ,
[0070] And inject ΔP within 2.5s d = 0.02pu load disturbance; see Table 1 for frequency stability using synovial film control and PID control.
[0071] method PID control synovial control Time for frequency deviation to stabilize to 0 15-20s 5-10s
[0072] Therefore, when the load disturbance occurs, it is faster to return the frequency to the normal range by using the synovial film control.
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The invention discloses a method for improving power grid frequency stability based on sliding mode control. The frequency of the power grid can be controlled more quickly. The method comprises the following steps: 1, building a single-region off-grid generator set mathematical model, and constructing a system state equation; 2, designing a sliding mode surface function of the system, and judgingconvergence of the sliding mode surface function through the Lyapunov criterion; and 3, designing the control rate u of the system, and judging convergence of the system through the Lyapunov criterion. Compared with a traditional PID control method, a sliding mode control method is adopted for frequency control, the main innovation of the sliding mode control strategy is that the sliding mode surface function adopts a proportional-integral (PI) function, the control rate is high, and the anti-interference capability of the system is high.
Description
technical field [0001] The invention relates to the technical field of power system automation, in particular to a method for improving the frequency stability of a power grid based on sliding mode control. Background technique [0002] With the increase of the complexity of the power network, the stability of the power system has become the key to the safety of the large power grid. Once the stability of the power system is damaged, it will cause huge economic losses and catastrophic consequences. With the gradual expansion of the scale of regional systems, sudden regional disturbances have extremely adverse consequences on the frequency stability of the power grid. [0003] In recent years, the pace of reform of the global power industry has been accelerating, and the power market under the competitive mechanism has been gradually established. The opening of the power grid and industrialized operation have made the power system run closer and closer to the limit of the sys...
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Login to View More IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 高忠飞李艳江赵孟皕周成力吕凯
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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