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Coordinated control method for water hammer effect of wind power compensation hydraulic turbine

A water hammer effect and collaborative control technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problem of no specific research on the impact of water hammer effect, so as to suppress the frequency deterioration of the power grid, eliminate adverse effects, and suppress secondary fluctuations Effect

Active Publication Date: 2018-04-10
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] At present, the frequency problems related to hydropower systems have not specifically studied the impact of water hammer effect on grid frequency; most of the methods to improve grid frequency deterioration are considering the optimization of turbine governor parameters, etc. Starting from the angle of compensating water hammer effect

Method used

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  • Coordinated control method for water hammer effect of wind power compensation hydraulic turbine
  • Coordinated control method for water hammer effect of wind power compensation hydraulic turbine
  • Coordinated control method for water hammer effect of wind power compensation hydraulic turbine

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Embodiment Construction

[0054] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0055] The block diagram of the water turbine figure 1 As shown, the P in the figure ref For a given reference active power, △ω r is the angular velocity deviation of the turbine rotor, △P L is the disturbance power, △μ is the guide vane opening, △P m is the output power of the turbine, T w is the water starting time constant, T G is the governor time constant, T R is the reset time, R T is the temporary power drop rate of the water hammer compensation link, R p is the uncompensated water hammer power drop rate. When the load increases, the response curve of the relevant variables of the turbine unit is as follows figure 2 shown by figure 2 It can be seen that when the load increa...

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Abstract

The invention discloses a coordinated control method for a water hammer effect of a wind power compensation hydraulic turbine. The coordinated control method includes the steps of S1, judging whetherthe change amount of a grid frequency is greater than a given value, and if so, performing a step S2; S2, a fan responding to the change in the grid frequency, and based on a virtual inertia control link, obtaining a first compensation power reference value Pf; S3, judging whether the guide vane opening of a hydraulic turbine changes, and if so, performing a step S4; S4, the fan responding to thechange of the guide vane opening of the hydraulic turbine, and based on a new additional control link, obtaining a second compensation power reference value P[mu]; and S5, acquiring the fan compensation power reference value total amount PTe-ref according to the first compensation power reference value Pf and the second compensation power reference value P[mu]. With the coordinated method of the virtual inertial control and the new additional control, the fan sends out a power shortage for compensating the water hammer effect, the deterioration of the grid frequency is effectively suppressed,and secondary fluctuations in the grid frequency caused by the water hammer effect can be avoided.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a cooperative control method for wind power compensation of water hammer effect of water turbines. Background technique [0002] Grid frequency is one of the important indicators to measure the safe and stable operation of the power system, and its dynamic behavior characteristics become more complex with the interconnection between grids. When a large load disturbance occurs in a power system with a high proportion of hydropower, due to the influence of the water hammer effect of the turbine, the output of the turbine cannot respond to the change of the load power in the grid in time, but the output power of the generator will temporarily decrease or increase, thereby destroying the balance of active power in the grid, and eventually leading to the deterioration of the grid frequency. [0003] On the other hand, my country is rich in wind energy resources, the win...

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Application Information

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IPC IPC(8): H02J3/24H02J3/40H02J3/38
CPCH02J3/24H02J3/386H02J3/40H02J2203/20Y02E10/76
Inventor 郭成李胜男王德林覃日升徐志周鑫
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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