Primary frequency modulation control method and system for wind power plant

A control method and technology for wind farms, applied in wind power generation, reducing/preventing power oscillation, and single-grid parallel feeding arrangement, etc., can solve problems such as failure to consider, excessive fan power, withdraw from frequency regulation, and insufficient release of load shedding power. , to achieve the effect of increasing the steady-state value of the frequency and improving the recovery speed

Inactive Publication Date: 2020-02-07
STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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Problems solved by technology

Literature "Chang-Chien L R, Hung C M, Yin Y C. Dynamic Reserve Allocation for System Contingency by DFIGWind Farms[J]. IEEE Transactions on Power Systems, 2008, 23(2):729-736." and "Fan Guannan, Liu Jizhen ,Meng Hongmin, et al.Primary frequency regulation strategy of wind farm under the condition of power grid load limit[J]. Power Grid Technology, 2016,40(7):2030-2037."Relevant research has been done on the active power distribution and frequency regulation control strategy of wind farm In terms of power distribution, the high-speed wind turbines undertake more frequency modulation power. In terms of frequency control, a combination of load shedding control and droop control is ad

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  • Primary frequency modulation control method and system for wind power plant
  • Primary frequency modulation control method and system for wind power plant
  • Primary frequency modulation control method and system for wind power plant

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Embodiment 1

[0060] This embodiment discloses a wind farm primary frequency modulation control method. On the basis of analyzing the frequency modulation characteristics of overspeed control and pitch angle control, a wind farm power distribution method that preferentially uses overspeed control and load reduction is proposed, that is, low wind speed Fan load shedding is given priority. In terms of tuning of frequency modulation control parameters, this disclosure proposes a frequency modulation control strategy of variable parameter control, and derives the expression of the droop control coefficient according to the working conditions of the wind turbines and the disturbance of the power grid, so as to ensure that each wind turbine can fully release itself when the frequency drops. of standby power. The simulation results show that the proposed control strategy can effectively optimize the dynamic characteristics of the system frequency response and improve the steady-state value of the ...

Embodiment 2

[0148] The purpose of this embodiment is to provide a computing device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, the following steps are implemented, including:

[0149] Wind farm power allocation strategy using overspeed load shedding control: After receiving the system dispatching command, the wind farm calculates the power that needs to be shed according to the wind speed information fed back by each wind turbine, and allocates the power reference value and load shedding control method to each single machine to maximize Store the kinetic energy of the rotor of the wind turbine to improve the frequency dynamic characteristics of the system;

[0150] The variable parameter control strategy is used in the frequency modulation control, which can ensure that the wind turbine can release its maximum reserve power during the frequency modulation process, and at the same time ...

Embodiment 3

[0152] The purpose of this embodiment is to provide a computer-readable storage medium.

[0153] A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are performed:

[0154] Wind farm power allocation strategy using overspeed load shedding control: After receiving the system dispatching command, the wind farm calculates the power that needs to be shed according to the wind speed information fed back by each wind turbine, and allocates the power reference value and load shedding control method to each single machine to maximize Store the kinetic energy of the rotor of the wind turbine to improve the frequency dynamic characteristics of the system;

[0155] The variable parameter control strategy is used in the frequency modulation control, which can ensure that the wind turbine can release its maximum reserve power during the frequency modulation process, and at the same time accelerate t...

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Abstract

The invention discloses a primary frequency modulation control method and system for a wind power plant. A wind power plant power distribution strategy by using overspeed load shedding control is used. The method comprises the steps that: after a wind power plant receives a system scheduling instruction, power requiring load shedding is calculated according to wind speed information fed back by all wind turbine generators, a power reference value and a load shedding control mode are distributed to all single machines, rotor kinetic energy of the wind turbine generators is stored to the maximumextent, and the frequency dynamic characteristic of a system is improved; and a variable parameter control strategy is utilized in frequency modulation control, the control strategy can ensure that afan can release the maximum standby power in the frequency modulation process, and the recovery speed after frequency drop is increased. It is guaranteed that each fan sufficiently releases standby power in the frequency modulation process, and a frequency steady-state value is effectively increased. The change of an inertia control coefficient can effectively improve the recovery speed of the frequency.

Description

technical field [0001] The invention belongs to the technical field of wind energy control, and in particular relates to a primary frequency modulation control method and system for a wind farm. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, renewable energy power generation represented by wind power has developed rapidly in my country, and the grid-connected capacity has increased year by year. By the end of 2017, my country's wind power installed capacity accounted for 35% of the world's total installed capacity, ranking first in the world. [0004] At the same time, the increase in wind power grid-connected capacity has also had a great impact on the safe and stable operation of the power system. Doubly-Fed Induction Generator (Doubly-Fed Induction Generator, DFIG) is the main model of current wind turbines, which ha...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J3/38H02J3/24
CPCH02J3/24H02J3/46Y02E10/76
Inventor 李勇刚刘军赵佃云苗伟威张文栋王茗杨小婷刘长锋陈磊廷罗迅汉新宇陈科成李宝富郭大伟鲁绪宝厉文秀滕怀峰崔巍邹维营
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY RIZHAOPOWER SUPPLY
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