Quantitative calculation method for power grid inertia weakening in wind power plant grid connection

A technology for wind farms and power grids, which is applied in the field of quantitative calculation of grid-connected wind farms to weaken grid inertia. The effect of objective, continuous real-time estimation of estimation results

Active Publication Date: 2019-11-29
CHINA THREE GORGES UNIV
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  • Application Information

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Problems solved by technology

In recent years, different virtual inertial response implementation methods emerge in endlessly, most of which focus on improving the virtual inertial response performance of wind turbines, but ignore the connection between theoretical research and popularization and application, resulting in a low practical application rate of existing control methods in wind farms

Method used

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  • Quantitative calculation method for power grid inertia weakening in wind power plant grid connection
  • Quantitative calculation method for power grid inertia weakening in wind power plant grid connection
  • Quantitative calculation method for power grid inertia weakening in wind power plant grid connection

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Embodiment

[0063] In Matlab / simulink environment, established Figure 4 The simulation system is the New England 10-machine 39-node standard test system. Among them, the fan is used instead of G10 to connect to the system, the motor is used to replace the conventional load on the 39 bus, and the slip rate of the motor is changed to simulate the load disturbance in the system.

[0064] Among them, the simulation parameters are as follows: 1) Double-fed fan parameters: rated voltage Vn = 575V, rated power Pn = 250MW, stator resistance Rs = 0.023pu, stator inductance Ls = 0.18pu, rotor resistance Rr = 0.016pu, rotor inductance Lr = 0.16pu, excitation inductance Lm=2.9pu, inherent inertia time constant HDFIG=5.29s, speed controller integral coefficient Ki=0.6. Rated angular velocity ωnom=157.08rad / s, rated wind speed VwN=11.7m / s, converter time constant τ=0.02s. 2) The generator, line and load simulation parameters are shown in Table 1, 2 and 3 respectively. All per unit values ​​are base...

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Abstract

The invention discloses a quantitative calculation method for power grid inertia weakening in wind power plant grid connection, and the method comprises the steps: solving a day-ahead equivalent inertia mean value of a whole power grid, carrying out the clustering division to replace a wind power plant adjacent small-region power grid of the whole power grid, and taking the result as a wind powerplant inertia weakening amount solving object; solving the equivalent inertia of a small-area power grid by using an equivalent electromechanical transient swing equation; decomposing and extracting the online capacity of the rotating load by utilizing the total load real-time data of each substation gateway in the small-area power grid; according to the equivalent inertia of the small-area powergrid, the online capacity of the load and the scheduling information of the synchronous generator and the wind power plant, solving the inertia of the rotating load, solving the inertia time constantof the wind power plant in a grid-connected state and an off-grid state, and further calculating the inertia weakening amount. The method can provide an application basis for making a virtual inertiacontrol strategy of the wind power plant, determining the limit of the wind power penetration power of the power grid and the like.

Description

technical field [0001] The invention belongs to the field of power system operation and control, and in particular relates to a quantitative calculation method for weakening the grid inertia caused by wind farm grid connection. Background technique [0002] System unit failure or sudden load increase will cause frequency accidents, especially when the equivalent inertia of the grid is small, the frequency will drop faster and the lowest point of frequency drop will be lower. The variable-speed wind turbines currently used in wind farms are connected to the grid through power electronic converters, resulting in electromechanical decoupling between the wind turbines and the grid and loss of inertial response capability. Therefore, the large-scale and high-proportional growth of wind power has had a significant impact on grid frequency stability. [0003] The wind power virtual inertia control method is considered to be an effective means to solve the above problems. In recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24Y02E10/76
Inventor 李世春
Owner CHINA THREE GORGES UNIV
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