A method for frequency control and power response performance improvement of variable-speed constant-frequency pumped storage units
A power response and frequency control technology, which is applied to control generators, control systems, and generators through magnetic field changes. Technical blank, the effect of suppressing frequency fluctuations
Active Publication Date: 2022-03-25
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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Problems solved by technology
[0004] The inverter adjusts the unit frequency, and the unit speed control system adjusts the power mode. Due to the fast adjustment characteristics of the inverter, the frequency adjustment performance of the unit is good, but the unit frequency may still fluctuate greatly; due to the water hammer effect of the turbine, the unit power In the early stage of adjustment, there will be obvious reverse adjustment phenomenon, and the power adjustment is very slow, which is difficult to meet the needs of pumped storage units to provide faster power support in some scenarios
[0005] However, the full-power variable-speed constant-frequency pumped storage unit is in a technical blank, and there are few related researches, which brings great challenges to the operation and control of the unit and the improvement of power regulation performance.
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[0061] A method for frequency control and power response performance improvement of a variable-speed constant-frequency pumped storage unit according to the present invention comprises the following steps:
[0062] S1: Obtain the mechanical torque T according to the control strategy of the speed control system of the unit m ;
[0063] S2: Obtain the excitation voltage E according to the constant flux linkage control strategy fd ;
[0064] S3: at excitation voltage E fd Under the control state, the mechanical torque T m Send it into the generator to obtain electromagnetic power;
[0065] S4: According to the rotor kinetic energy release control strategy of the unit, calculate the unit speed change Δf required for the rotor kinetic energy release r ;
[0066] S5: The electromagnetic power and unit speed variation Δf r Send it to the rectifier and inverter to obtain the adjusted unit frequency.
[0067] Aiming at the operating conditions of the full-power variable-speed c...
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The invention discloses a method for frequency control and power response performance improvement of a variable-speed constant-frequency pumped-storage unit, comprising the following steps: S1: obtaining the mechanical torque according to the control strategy of the speed regulation system of the unit; S2: obtaining the excitation voltage according to the constant flux linkage control strategy ; S3: Under the control state of the excitation voltage, send the mechanical torque to the generator to obtain the electromagnetic power; S4: Calculate the unit speed change required for the rotor kinetic energy release according to the control strategy of the rotor kinetic energy release; S5: The electromagnetic power and the unit speed change are sent to the rectifier and inverter to obtain the adjusted unit frequency. The invention utilizes the millisecond-level control ability of the frequency converter to realize rapid control of the unit frequency; during the transient process of unit power adjustment, the kinetic energy stored in the generator rotor is released by reducing the unit speed, and at the same time cooperates with the excitation control to prevent the unit from entering magnetic saturation. And further suppress frequency fluctuations, speed up unit power adjustment.
Description
technical field [0001] The invention belongs to the technical field of operation regulation of a variable-speed constant-frequency pumped-storage unit, and in particular relates to a method for frequency control and power response performance improvement of a variable-speed constant-frequency pumped-storage unit. Background technique [0002] The variable-speed constant-frequency pumped storage unit using IGBT-based full-power power electronic converters is currently a blank in domestic technology, and there are no mature equipment and products, and there are few related theoretical studies. [0003] The new generation of variable-speed constant-frequency pumped-storage units based on full-power power electronic converters basically consists of two parts: a variable-speed pump-turbine is used on the generator side, and an IGBT-based frequency converter is used on the grid side. Affected by the inertia of the hydraulic system and the mechanical system, the power response time...
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IPC IPC(8): H02J3/24H02J3/38H02P9/30
CPCH02J3/241H02J3/38H02P9/305H02J2203/20
Inventor 史华勃滕予非刘畅陈刚丁理杰周波范成围王曦魏巍
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST