Static frequency conversion starting power factor optimal control method for pumped storage power station
A pumped storage power station, power factor technology, applied in the direction of single motor speed/torque control, torque ripple control, output power conversion device, etc., can solve the problem of low power factor of static frequency converter and shorten the start-up cycle , rapidity and stability improvement, and the effect of reducing torque ripple
Active Publication Date: 2013-07-17
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology
[0005] Aiming at the problem of low power factor of existing static frequency converters, the present invention proposes an optimal control method for static variable frequency start-up power factor of pumped storage power plants, which realizes the start of frequency converters of pumped storage units and effectively increases the power of static frequency converters factor to improve the unit start-up speed characteristics
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[0033] The present invention will be further described in detail below with reference to the accompanying drawings and in conjunction with an example of the start-up control of a pumped-storage power plant. However, the invention is not limited to the examples given.
[0034] The optimal control method for the power factor of the static variable frequency start-up of the pumped storage power station includes the following steps:
[0035] 1) System initialization
[0036] Set up the controller registers, initialize the parameter settings, and order:
[0037] =13.8kV
[0038] =21
[0039] =58.54
[0040] 2) Calculation of control strategy conversion point frequency.
[0041] According to the unit parameters, and set K =0.95, =40°, =10° According to the formula (3), the static variable frequency start-up parameters of the pumped storage power station can be calculated:
[0042] =43.6Hz
[0043] 3) When the unit frequency is less than or equal to time control s...
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The invention discloses a static frequency conversion starting power factor optimal control method for a pumped storage power station. The method comprises the following steps of: 1) system initialization, setting of a control register and setting of initialization parameters; and 2) computation of control strategy switching point frequency. The technical scheme provided by the invention has the remarkable advantages that: 1, a power factor of a frequency converter can be remarkably increased by control strategies provided by the invention, and a maximum power factor can be 1 when a margin coefficient is 1; and 2, a method for control in different stages is implemented by computing control mode switching points, a value of gamma is relatively lower before the frequency reaches f0 so as toobtain relatively higher electromagnetic torque, reduce torque ripples, increase static starting speed and improve static starting stability, and after the frequency reaches f0, speed regulation overa machine set is realized by controlling the gamma, open loop control is performed on a rectification side by adopting alpha0 and the machine set is run under a maximum power factor, so that the machine set can rapidly meet synchronous conditions, and a starting period can be shortened.
Description
technical field [0001] The invention relates to an optimal control method for power factor of static variable frequency start-up of a pumped storage power station, which belongs to the static variable frequency start technology of a pumped storage power station. Background technique [0002] At present, the pumped storage power station has multiple working conditions such as pumping water and generating electricity. As the largest electric energy storage system, various types of units in the grid, such as thermal power, hydropower, nuclear power units, etc., can be operated in a better environment. Stable operation under working conditions can prolong the running time of the above-mentioned units as much as possible, reduce the number of starts, save energy consumption, and play a huge role in ensuring the safety of power grid operation, and it is technically and economically feasible and effective. [0003] At present, pumped storage power plants use static variable frequen...
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IPC IPC(8): H02P6/20H02P6/08H02P6/10H02M1/42
CPCY02B70/126Y02B70/10
Inventor 王德顺杨波李官军陶以彬吕宏水陈梅吴福保桑丙玉姬联涛俞斌曹远志
Owner STATE GRID ELECTRIC POWER RES INST