Wind power plant primary frequency modulation control method and control system
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A technology of wind farm and system frequency, applied in the field of primary frequency modulation control method and control system of wind farm, can solve the problems of grid dynamic imbalance, increase system cost, increase grid frequency deviation, etc. Additional active power, the effect of improving frequency adaptability
Pending Publication Date: 2021-10-08
HUANENG CLEAN ENERGY RES INST
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Problems solved by technology
The fluctuation of wind power will lead to a dynamic imbalance between the active output of the power grid and the load, resulting in an increase in the frequency deviation of the power grid and endangering the safe and stable operation of the power system.
In order to suppress fluctuations in wind power, conventional generators are usually required to provide a certain amount of backup capacity for wind turbines. , will greatly increase the cost of the system
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Embodiment 1
[0047] like figure 1 As shown, the first embodiment of the present invention provides a method for primary frequency modulation control of a wind farm, the method comprising: receiving a scheduling instruction;
[0048] Obtain the grid-connected point measurement value;
[0049] The measured value of the grid-connected point includes the voltage and current of the grid-connected point;
[0050] The voltage and current of the grid-connected point are output to a high-precision frequency measuring device, and the system frequency and frequency change rate of the grid-connected point are calculated;
[0051] refer to figure 2 , based on the difference between the rated frequency of the power grid and the system frequency of the grid-connected point, determine whether the difference exceeds the first dead zone of primary frequency regulation: according to the grid-connected requirements of the wind farm, the first dead zone of primary frequency regulation is set to ±0.05Hz;
[0...
Embodiment 2
[0092] like Figure 4 As shown, based on the same inventive concept, the second embodiment of the present invention provides a wind farm primary frequency modulation control system, the control system includes:
[0093] A FM host 11 is configured as,
[0094] Based on the difference between the rated frequency of the power grid and the system frequency and the frequency change rate, it is judged whether to enable the primary frequency regulation function of the system;
[0095] If it is started, the total active power adjustment required by the wind farm is obtained based on the joint control strategy of frequency droop and virtual moment of inertia, and then the total active power adjustment is superimposed on the initial AGC system command value and output to the energy management platform to adjust the wind turbine output. Wind farm primary frequency modulation function. details as follows:
[0096] Based on the difference between the rated frequency of the power grid an...
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Abstract
The invention provides a wind power plant primary frequency modulation control method and a control system. The method comprises the steps: adjusting the active output of a wind turbine generator through a primary frequency modulation host, an active power automatic control system (AGC system) and an energy management platform according to a dispatching instruction and the measurement information in the wind power plant, and achieving the primary frequency modulation function of the wind power plant so as to meet the grid connection requirement of the wind power plant. The control system collects in-station measurement information of the wind power plant, especially grid-connected point voltage and current information, calculates a grid-connected point system frequency and a frequency change rate through a high-precision frequency measurement device, and obtains a total active power adjusting quantity required by the wind power plant according to a frequency droop and virtual rotational inertia control strategy. And the total active power adjusting quantity is superposed to an AGC system instruction value, is output to an energy management platform, the output of a wind turbine generator is adjusted, a primary frequency modulation function of a wind power plant is realized, and system frequency recovery is supported.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a primary frequency modulation control method and control system of a wind farm. Background technique [0002] Wind power generation is different from conventional power sources. The collection lines are long and most of them are at the end of the power supply grid. Random fluctuations in the output power of wind farms have brought many adverse effects on the operation of the grid. [0003] With the increasing proportion of wind power in the power generation capacity of the whole grid, the penetration rate of wind power is further improved, and the impact of wind power on the power system is becoming more and more obvious. The fluctuation of wind power will lead to a dynamic imbalance between the active power output and the load of the power grid, which will increase the frequency deviation of the power grid and endanger the safe and stable operation of ...
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