CN108667053B - Working condition switching simulation implementation method for water pump turbine and double-fed motor of pumped storage power station - Google Patents
Working condition switching simulation implementation method for water pump turbine and double-fed motor of pumped storage power station Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention provides a working condition switching simulation implementation method of a water pump turbine and a double-fed motor of a pumped storage power station, which comprises 3 parts of hydraulic turbine working condition transition process simulation implementation, water pump working condition transition process simulation implementation and mutual switching process simulation implementation between the hydraulic turbine working condition and the water pump working condition. The method considers the influence of the whole transition process of the pumped storage power station in grid-connected operation on the power grid power when the pumped storage power station is switched over, and realizes the simulation of the complete transition process of the pumped storage power station from one working condition starting grid-connected operation to full-load operation to disconnection shutdown and then from the other working condition starting grid-connected operation to full-load operation to disconnection shutdown by the block simulation modeling of each operation working condition of the pumped storage power station; through modeling simulation, a new idea is provided for the simulation application of the double-fed variable-speed pumped storage unit in the power system; the method has important significance for researching the compensation range and the compensation speed of the pumped storage power station on the power fluctuation of the power grid.
Description
Technical Field
The invention belongs to the application field of power electronic devices in pumped storage power stations, and particularly relates to a working condition switching simulation implementation method for a water pump turbine and a double-fed motor of a pumped storage power station.
Background
With the continuous development of new energy power generation, a pumped storage system with the capabilities of peak clipping, valley filling and system power balance maintaining is concerned. In a pumped storage system, the control of the rotor side of a doubly-fed motor by using a power electronic device has a crucial influence on the operation condition of a pumped storage unit.
The double-fed pumped storage system consists of a double-fed motor which is used as a generator and a motor, a pump turbine and a current converter. The following operating conditions generally exist for the pumped storage group: the working condition of a water pump, the working condition of a water turbine, synchronous phase modulation, rotation standby and the like. The transition between the operating conditions of the pumped-storage group can generate more than 20 transition processes. For example: starting the water pump working condition/water turbine working condition, increasing or reducing the power of the water pump working condition/water turbine working condition, normally stopping the water pump working condition/water turbine working condition, switching the water turbine working condition and the water pump working condition, converting the water pump working condition into a phase modulation working condition and the like. The switching process of the pump turbine and the double-fed motor of the pumped storage power station has great significance for researching whether the pumped storage power station can run safely, reliably and efficiently during grid-connected operation, so that a simulation implementation method is expected to be capable of implementing simulation of the transition process of the pumped storage power station.
Many scholars have developed researches on the transition process of the pumped storage power station, and the researches on the transition process of the pumped storage power station mainly focus on the influence of the dynamic characteristic of the emergency condition and the full characteristic curve of the reversible pump turbine on the transition process. In the prior art document [1], a new water turbine regulating system considering a water pressure pipeline elastic water hammer model is established, a second-order model of a generator is established, and the nonlinear dynamic characteristics of the water turbine regulating system when a sudden load increase occurs are analyzed. In the prior art document [2], an out-of-control process of a pumped storage power station is simulated by coupling a one-dimensional water pipeline model and a three-dimensional water pump water turbine model, and the result shows that the dynamic characteristic of the out-of-control process forms a loop in an S-shaped area of a full characteristic curve and does not follow the corresponding static characteristic; through theoretical analysis and flow state comparison, the influence of the prior state on the transient flow of the pump turbine is discovered; these features cause different behavior between similar operating points due to differences in flow direction.
Technical literature:
[1] nonlinear modeling and dynamic analysis of a hydro-turbo converting system in the process of subsidiary load increase transfer, Mechanical Systems & Signal Processing, Vol.80;
[2] the Looping dynamic characteristics of a pump-turbine in the S-shaped region piping road, Journal of Fluids Engineering, vol. 138, No. 9.
Disclosure of Invention
A working condition switching simulation implementation method for a water pump turbine and a double-fed motor of a pumped storage power station is characterized by comprising the following steps of: the working condition switching simulation implementation comprises three parts, namely hydraulic turbine working condition transition process simulation implementation, water pump working condition transition process simulation implementation and mutual switching process simulation implementation between the hydraulic turbine working condition and the water pump working condition, and the pumped storage power station is implemented by performing block simulation modeling on each part and then integrating and packaging time logic elements.
Further, the simulation of the transition process of the working condition of the water turbine and the working condition of the water pump respectively comprises the stages of starting simulation, load increasing/decreasing simulation, stable operation simulation and splitting shutdown simulation; and the simulation of the mutual switching of the working condition of the water turbine and the working condition of the water pump is realized by the mutual matching of the time logic element and the phase change switch.
Further, the simulation model comprises an infinite power supply, a grid-connected switch, a phase change switch, a double-fed motor, a rotor side converter, a stator side short-circuit switch, a pump turbine and a voltage and current acquisition observation module, wherein the pump turbine outputs a mechanical torque to be input into the double-fed motor, the stator side of the double-fed motor is connected with the infinite power supply through the grid-connected switch and the phase change switch, the stator side short-circuit switch is arranged between the grid-connected switch and the stator side of the double-fed motor, and the rotor side converter is provided in the form of a controlled current source.
Further, the simulation implementation method for the working condition transition process of the water turbine comprises the following steps:
a. the method for realizing the simulation of the working condition starting of the water turbine comprises the following steps: the starting of the working condition of the water turbine in the model can be divided into three stages, wherein the first stage is a self-starting stage, in the stage, the stator side of the doubly-fed motor in the model is in short circuit through a stator side short circuit switch, the control of the rotor side is interrupted, so that a control signal is not output, the opening degree of a guide vane of the water pump turbine is input into the opening degree of a starting guide vane through a constant value input module, and the doubly-fed motor starts to rotate in the positive direction; when the forward rotation speed of the double-fed motor reaches 1.1-1.2 times of the synchronous rotation speed, the rotation speed is kept constant in a rotor side converter input rotation speed control link; the second stage is a grid-connected preparation stage, the control of the rotor side converter is interrupted again to enable the rotor side converter not to generate a control signal, and a short-circuit switch on the stator side is opened; the third stage is a no-load grid-connected stage, a stator side voltage regulating module is put into a rotor side converter, and when the stator voltage meets a grid-connected condition, a grid-connected switch at the stator side is switched on;
b. the simulation realization method for the load increase/decrease and the steady-state operation of the water turbine under the working condition comprises the following steps: in the model, a power priority control strategy is adopted for simulating the stages, the working condition load of the water turbine is increased/decreased in the stages, and a power instruction is given to a trapezoidal wave form with tens of megawatt active power step changes every several seconds;
c. the method for realizing the splitting shutdown simulation of the working condition of the water turbine comprises the following steps: the splitting shutdown of the water turbine under the working condition in the model can be divided into two stages, wherein the first stage is a splitting stage, the current on the stator side is controlled and adjusted to be close to 0 by a converter on the rotor side in the model, and then a grid-connected switch on the stator side is disconnected; the second stage is a braking stage, an electric braking method is adopted in the braking stage in the model, the stator side short circuit is achieved by closing the stator side short circuit switch, the rotor side converter excitation control link enables the double-fed motor to generate a counteractive electromagnetic torque to reduce the rotating speed of the unit, until the rotating speed of the double-fed motor is close to 0, the control of the rotor side converter is interrupted, the control signal is not generated any more, and the stator side short circuit switch is opened.
Further, the method for realizing the simulation of the transition process of the working condition of the water pump comprises the following steps:
a. the water pump working condition starting simulation implementation method comprises the following steps: the starting of the working condition of the water pump is divided into three stages in the model, the first stage is a rotating speed rising stage, a short-circuit switch on the stator side is closed to carry out short circuit on the stator side of the double-fed motor, excitation control is put into a rotor side converter to generate an inverted phase sequence current with constant magnitude and 60Hz to flow into the rotor side of the double-fed motor, and when the rotating speed reaches 1.1-1.2 times of synchronous speed, the control of the rotor side converter is switched to rotating speed control to enable the rotating speed to be stable; the second stage is a grid-connected preparation stage, the control of the converter at the rotor side is interrupted, no control signal is generated, and the short-circuit switch at the stator side is opened; the third stage is a voltage-regulating grid-connected stage, voltage at the stator side is regulated by adding voltage-regulating control to the rotor side converter, and a grid-connected switch is switched on when grid-connected conditions are met;
b. the method for realizing the simulation of the load increase/decrease and the steady-state operation of the working condition of the water pump comprises the following steps: the simulation of the stages is realized by adopting a rotation speed priority control strategy in the model, and when the load increase/decrease of the working condition of the water pump is realized by simulation, the reference value of the power is given in a step-shaped form of increasing/decreasing active power by tens of megawatts every several seconds;
c. the method for realizing the water pump working condition splitting shutdown simulation comprises the following steps: the simulation of realizing the normal stop of the water pump under the working condition can be divided into two stages, wherein the first stage is a disconnection stage, after the load shedding stage under the working condition of the water pump is finished, excitation control is put into the rotor-side converter to regulate the current of the stator side to be close to 0, and then the grid-connected switch is switched off; the second stage is a braking stage, an electric braking mode is still adopted when the stage is realized in a simulation mode, the stator side short-circuit switch is closed, the electromagnetic torque which is generated by adding excitation control on the rotor side converter and generates reaction enables the rotating speed of the unit to be reduced, and when the rotating speed is reduced to 0, the control of the rotor side converter is interrupted, so that the rotor side converter does not generate a control signal any more, and the stator side short-circuit switch is opened.
Further, the simulation of the switching process between the working condition of the water turbine and the working condition of the water pump is realized by the following steps:
a. the simulation implementation method for switching the working condition of the water turbine to the working condition of the water pump comprises the following steps: the simulation realization of the transition process of the working condition of the water turbine and the simulation realization of the transition process of the working condition of the water pump are connected by utilizing the switching phase-changing operation, the switching phase-changing operation is realized by 4 single-phase circuit breakers in the simulation, the ABC three-phase of a power supply before phase changing is connected with the ABC three-phase of the stator side of the double-fed motor, the A phase of the power supply after phase changing is connected with the A phase of the stator side of the double-fed motor, the B phase of the power supply is connected with the C phase of the stator side of the double.
b. The simulation implementation method for switching the working condition of the water pump to the working condition of the water turbine comprises the following steps: the transition process simulation realization of the water pump working condition is connected with the water turbine working condition transition process simulation realization by utilizing the switching phase-changing operation, the switching phase-changing operation is realized by 4 single-phase circuit breakers in the simulation, the power supply ABC three-phase is connected with the doubly-fed motor stator side ABC three-phase before the phase change, the power supply A phase is connected with the doubly-fed motor stator side A phase after the phase change, the power supply B phase is connected with the doubly-fed motor stator side C phase, and the power supply C phase is connected with the doubly-fed motor stator side B phase.
Furthermore, the opening degree of the starting guide vane in the working condition of the water turbine is different according to the type and the water head of the pump water turbine.
Further, when the stable operation stage of the working conditions of the water turbine and the water pump is simulated, in order to observe the dynamic characteristic during the stable operation, a step of dozens of megawatts is added to the power command during the stable operation simulation, and the power step is subtracted after the steady state is reached for a period of time, so as to observe the dynamic characteristic of the power response.
Drawings
FIG. 1 is a simulation main circuit of a pumped storage power station of the present invention;
FIG. 2 is a diagram of a power priority control strategy implementation of the present invention;
FIG. 3 is a diagram illustrating a preferred strategy for controlling rotational speed according to the present invention;
FIG. 4 is a schematic diagram of the power waveform and the rotation speed waveform of the working condition switching simulation stator of the water turbine of the present invention;
FIG. 5 is a schematic diagram of a power waveform and a rotation speed waveform of a water pump working condition switching simulation stator side according to the present invention;
FIG. 6 is a simulated stator side power waveform diagram of the mutual switching between the water turbine working condition and the water pump working condition.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A working condition switching simulation implementation method for a water pump turbine and a double-fed motor of a pumped storage power station divides the working condition switching simulation implementation of a pumped storage system into 3 parts, namely the simulation implementation of the working condition transition process of the water turbine, the simulation implementation of the working condition transition process of the water pump and the simulation of the mutual switching process between the working condition of the water turbine and the working condition of the water pump, and realizes the simulation of the working condition switching transition process of the pumped storage power station by carrying out block simulation modeling on each part and then using a time logic element integration and encapsulation method.
When the transition process of the working condition of the water turbine and the working condition of the water pump is simulated, the stages of starting simulation, load increasing/decreasing simulation, stable operation simulation, splitting shutdown simulation and the like are respectively included; and the simulation of the mutual conversion of the working condition of the water turbine and the working condition of the water pump is realized by the mutual matching of the time logic element and the phase change switch. And finally, the simulation of the complete transition process of the pumped storage unit is realized.
The simulation model comprises an infinite power supply, a grid-connected switch, a phase-change switch, a double-fed motor, a rotor-side converter, a stator-side short-circuit switch, a water pump turbine, a voltage and current acquisition observation module and the like. The pump turbine outputs a mechanical torque to be input into the double-fed motor, the stator side of the double-fed motor is connected with an infinite power supply through a grid-connected switch and a phase-change switch, a stator side short-circuit switch is arranged between the grid-connected switch and the stator side of the double-fed motor, and a rotor side converter is provided in the form of a controlled current source.
Fig. 1 is a simulation main circuit of a pumped storage power station of the present invention. The simulation main circuit comprises an infinite power supply, a resistor, a phase change switch, a grid-connected switch, a stator side short-circuit switch, a double-fed motor, a rotor side converter, a water pump turbine, a voltage and current measuring module and the like. An infinite power supply is used as a power grid in simulation; the resistor is used as system impedance, so that power fluctuation caused by grid connection is reduced; the phase change switch is used for realizing the phase change operation when the working condition of the water turbine and the working condition of the water pump are mutually converted; the grid-connected switch is used for realizing grid-connected and splitting operation of a power grid and the pumped storage power station; the stator side short-circuit switch is used for realizing the short-circuit operation of the stator side of the double-fed motor; the double-fed motor, the pump turbine and the converter form a pumped storage power station; the rotor side converter is used for realizing the control of the operation condition of the pumped storage power station; the voltage and current measuring module is used for measuring voltage and current. When the simulation of the working condition starting of the water turbine is carried out, the opening degree of a starting guide vane of the water pump-turbine is set to be 6%, and the parameter setting condition of a double-feeder model adopted in the simulation is shown in table 1.
TABLE 1 Dual feeder model parameters
The simulation implementation method for the working condition transition process of the water turbine comprises the following steps:
a. the method for realizing the simulation of the working condition starting of the water turbine comprises the following steps: the start-up of the water turbine operating conditions in the model can be divided into three phases. The first stage is a self-starting stage, in the self-starting stage, the stator side of the doubly-fed motor in the model is in short circuit through a stator side short circuit switch, the control of the rotor side is interrupted, the control signal is not output, the guide vane opening degree of the water pump turbine is input through a constant value input module to start the guide vane opening degree, and the doubly-fed motor starts forward rotation. When the forward rotation speed of the double-fed motor reaches 1.1-1.2 times of the synchronous rotation speed, the rotation speed is kept constant in a rotor side converter input rotation speed control link; and the second stage is a grid-connected preparation stage, the control of the rotor side converter is interrupted again to enable the rotor side converter not to generate a control signal, and the short-circuit switch on the stator side is opened. And the third stage is an idle grid connection stage, a stator side voltage regulating module is put into the converter at the rotor side, and when the stator voltage meets grid connection conditions (the frequency, amplitude and phase of the voltage at the stator side of the double-fed motor are equal to the voltage frequency, amplitude and phase of a power grid), a grid connection switch at the stator side is switched on.
b. The simulation realization method for the load increase/decrease and the steady-state operation of the water turbine under the working condition comprises the following steps: the simulation of these phases in the model employs a power-first control strategy. In the working condition load increasing/decreasing stage of the water turbine, the power instruction is given in a trapezoidal wave form of tens of megawatt active power step steps every several seconds.
Fig. 2 is a power priority control strategy implementation diagram of the invention, in the control mode, a rotor side converter of the doubly-fed motor realizes the control of stator side power, and the control of rotating speed is realized by adjusting a speed regulator of a pump turbine. When the reference value of the active power of the unit is changed, the rotor side converter responds quickly, so that the actual active power output value tracks the reference value quickly; meanwhile, the optimal operation speed of the unit is calculated through the operation characteristic curve of the pump turbine, and is transmitted to the speed regulator of the pump turbine, so that the rotation speed of the unit and the output power of the pump turbine are adjusted.
c. The method for realizing the splitting shutdown simulation of the working condition of the water turbine comprises the following steps: the split shutdown of the water turbine operating conditions in the model can be divided into two stages. The first stage is a splitting stage, the current on the rotor side converter in the model is controlled and adjusted to be close to 0, and then a grid-connected switch on the stator side is disconnected; the second stage is a braking stage, an electric braking method is adopted in the braking stage in the model, the stator side short circuit is achieved by closing the stator side short circuit switch, the rotor side converter excitation control link enables the double-fed motor to generate a counteractive electromagnetic torque to reduce the rotating speed of the unit, until the rotating speed of the double-fed motor is close to 0, the control of the rotor side converter is interrupted, the control signal is not generated any more, and the stator side short circuit switch is opened.
The simulation realization method for the transition process of the water pump working condition comprises the following processes:
a. the water pump working condition starting simulation implementation method comprises the following steps: the starting of the working condition of the water pump is divided into three stages in the model. The first stage is a rotating speed rising stage, a short-circuit switch on the stator side is closed to carry out short circuit on the stator side of the double-fed motor, excitation control is put into a rotor side converter to generate an inverted phase sequence current with constant magnitude and 60Hz frequency to flow into the rotor side of the double-fed motor, and when the rotating speed reaches about 1.1-1.2 times of the synchronous speed, the control of the rotor side converter is switched to rotating speed control to enable the rotating speed to be stable; the second stage is a grid-connected preparation stage, the control of the converter at the rotor side is interrupted, no control signal is generated, and the short-circuit switch at the stator side is opened; and the third stage is a voltage-regulating grid-connected stage, voltage at the stator side is regulated by adding voltage-regulating control to the rotor side converter, and a grid-connected switch is switched on when grid-connected conditions are met.
b. The method for realizing the simulation of the load increase/decrease and the steady-state operation of the working condition of the water pump comprises the following steps: the simulation of the stages is realized by adopting a rotation speed priority control strategy in the model, and when the load increase/decrease of the working condition of the water pump is realized by the simulation, the reference value of the power is given in a step-shaped form of increasing/decreasing active power by tens of megawatts every several seconds.
Fig. 3 is a rotation speed priority control strategy implementation diagram of the present invention, in this control mode, the doubly-fed motor rotor side converter realizes the control of the unit rotation speed, and the unit output power is realized by adjusting the guide vane opening of the pump turbine. When the reference value of the active power of the unit is changed, the optimal running speed is calculated through the running characteristic curve of the pump turbine and is transmitted to the rotor side converter. And the quick tracking of the rotating speed of the unit to the optimal running rotating speed is realized by adjusting the current of the rotor side. Meanwhile, the power reference value is transmitted to the water pump turbine, and the power output is adjusted by adjusting the opening degree of the guide vane.
c. The method for realizing the water pump working condition splitting shutdown simulation comprises the following steps: similar to the simulation implementation method of the splitting shutdown of the working condition of the water turbine, the simulation implementation of the normal shutdown of the working condition of the water pump can be divided into two stages. The first stage is a splitting stage, after the water pump working condition load shedding stage is finished, excitation control is put into the rotor side converter to adjust the stator side current to be close to 0, and then the grid-connected switch is disconnected; the second stage is a braking stage, an electric braking mode is still adopted when the stage is realized in a simulation mode, the stator side short-circuit switch is closed, the electromagnetic torque which is generated by adding excitation control on the rotor side converter and generates reaction enables the rotating speed of the unit to be reduced, and when the rotating speed is reduced to 0, the control of the rotor side converter is interrupted, so that the rotor side converter does not generate a control signal any more, and the stator side short-circuit switch is opened.
The simulation realization method for the switching process between the working condition of the water turbine and the working condition of the water pump comprises the following parts:
a. the simulation implementation method for switching the working condition of the water turbine to the working condition of the water pump comprises the following steps: the simulation realizes that the operating mode of the water turbine is switched to the operating mode of the water pump by the switching phase-changing operation, the switching phase-changing operation between two operating modes is realized by 4 single-phase circuit breakers in the simulation, the power supply ABC three-phase is connected with the doubly-fed motor stator side ABC three-phase before the phase change, the power supply A phase is connected with the doubly-fed motor stator side A phase after the phase change, the power supply B phase is connected with the doubly-fed motor stator side C phase, and the power supply C phase is connected with the doubly-fed motor stator side B phase.
b. The simulation implementation method for switching the working condition of the water pump to the working condition of the water turbine comprises the following steps: the process of converting the water pump working condition into the water turbine working condition also needs phase-change operation in a simulation manner, and the specific implementation method is described in detail in the simulation implementation method for converting the water turbine working condition into the water pump working condition.
The opening of the starting guide vane in the working condition of the water turbine is different according to the type and the water head of the pump water turbine, and the common mixed flow is between 5 and 15 percent.
When the stable operation stage of the working conditions of the water turbine and the water pump is simulated, in order to observe the dynamic characteristic of the stable operation, a step of dozens of megawatts is added to a power instruction during the stable operation simulation, and the power step is subtracted after the power instruction reaches a stable state for a period of time, so that the dynamic characteristic of power response is observed.
Fig. 4 is a stator side power waveform diagram and a rotating speed waveform diagram obtained by simulation of the water turbine working condition switching. The active power flowing out of the power grid is specified as the positive direction of the active power, the mechanical power flows from the pump turbine to the double-fed motor as the positive direction, and the rotating speed of the unit is specified as the positive direction of the rotating speed direction under the working condition of the water turbine.
Under the reference direction, a simulation oscillogram of the simulation of the whole switching process of the working condition starting simulation, the load increasing simulation, the stable operation simulation, the load reducing simulation and the splitting shutdown simulation of the water turbine is obtained. The left graph in fig. 4 shows a stator side power waveform, and the active power flows from the doubly-fed motor to the power grid because the unit operates in the working condition of the water turbine, so that the active power is negative. The right graph of fig. 4 shows a waveform of the rotation speed, when the unit rotates in the forward direction, the rotation speed is positive.
Wherein, starting simulation is carried out on the water turbine under the working condition between 0s and 90.4 s; closing a grid-connected switch to realize grid connection at 90.4 s; no-load operation simulation is carried out for 90.4s to 120 s; 120s to 200s are load increasing simulation of the working condition of the water turbine; 200s to 280s are the simulation of the steady-state operation of the working condition of the water turbine; 280s to 350s are load reduction simulation of the working condition of the water turbine; 350s to 370s are no-load running simulation; the pumped storage power station is disconnected with the power grid at 370 s; 370 s-450 s are simulation of normal shutdown of the water turbine under working conditions.
FIG. 5 is a stator side power waveform and a rotation speed waveform of the water pump during the simulation of the working condition switching of the water pump. The reference direction is shown in the above description, and the simulation oscillogram of the simulation of the whole switching process of the water pump working condition starting simulation, the load increasing simulation, the stable operation simulation, the load reducing simulation and the splitting shutdown simulation is obtained. The left diagram of fig. 5 shows a stator side power waveform diagram, and active power flows from a power grid to a doubly-fed motor due to the fact that the unit operates under the working condition of a water pump, and therefore the active power is positive. The right graph of fig. 5 shows a waveform of the rotation speed, when the unit rotates reversely, the rotation speed is negative.
Starting simulation under the working condition of the water pump between 0s and 60 s; closing a grid-connected switch at 60s to realize grid connection; no-load operation simulation is carried out for 60s to 80 s; 80-150 s is load-increasing simulation of the working condition of the water pump; 150s to 240s are the steady-state operation simulation of the working condition of the water pump; 240s to 330s are water pump working condition load reduction simulation; 330s to 350s are no-load running simulation; the pumped storage power station is disconnected with the power grid in 350 s; 350s to 400s are simulation of normal shutdown of the water pump under working conditions.
FIG. 6 is a waveform diagram of power at the stator side when the working conditions of the water turbine and the water pump are switched and simulated, and the reference direction of the power is shown in the above description. When the simulation realizes the interconversion between the working condition of the water turbine and the working condition of the water pump, the simulation of the transition process of the working condition of the water turbine and the simulation of the transition process of the working condition of the water pump are the same as the simulation of the working condition of the water turbine and the simulation of the working condition of the water pump, and the details are not repeated here.
Claims (3)
1. A working condition switching simulation implementation method for a water pump turbine and a double-fed motor of a pumped storage power station is characterized by comprising the following steps of: the simulation realization of the working condition switching is divided into three parts, namely simulation realization of the working condition transition process of the water turbine, simulation realization of the working condition transition process of the water pump and simulation realization of the mutual switching process between the working condition of the water turbine and the working condition of the water pump, wherein a simulation model comprises an infinite power supply, a grid-connected switch, a phase-change switch, a double-fed motor, a rotor side converter, a stator side short-circuit switch, a water pump water turbine and a voltage and current acquisition observation module;
the simulation implementation method for the working condition transition process of the water turbine comprises the following steps:
a. the method for realizing the simulation of the working condition starting of the water turbine comprises the following steps: the starting of the working condition of the water turbine in the model can be divided into three stages, wherein the first stage is a self-starting stage, in the stage, the stator side of the doubly-fed motor in the model is in short circuit through a stator side short circuit switch, the control of the rotor side is interrupted, so that a control signal is not output, the opening degree of a guide vane of the water pump turbine is input into the opening degree of a starting guide vane through a constant value input module, and the doubly-fed motor starts to rotate in the positive direction; when the forward rotation speed of the double-fed motor reaches 1.1-1.2 times of the synchronous rotation speed, the rotation speed is kept constant in a rotor side converter input rotation speed control link; the second stage is a grid-connected preparation stage, the control of the rotor side converter is interrupted again to enable the rotor side converter not to generate a control signal, and a short-circuit switch on the stator side is opened; the third stage is a no-load grid-connected stage, a stator side voltage regulating module is put into a rotor side converter, and when the stator voltage meets a grid-connected condition, a grid-connected switch at the stator side is switched on;
b. the simulation realization method for the load increase/decrease and the steady-state operation of the water turbine under the working condition comprises the following steps: in the model, a power priority control strategy is adopted for simulating the stages, the working condition load of the water turbine is increased/decreased in the stages, and a power instruction is given to a trapezoidal wave form with tens of megawatt active power step changes every several seconds;
c. the method for realizing the splitting shutdown simulation of the working condition of the water turbine comprises the following steps: the splitting shutdown of the water turbine under the working condition in the model can be divided into two stages, wherein the first stage is a splitting stage, the current on the stator side is controlled and adjusted to be close to 0 by a converter on the rotor side in the model, and then a grid-connected switch on the stator side is disconnected; the second stage is a braking stage, an electric braking method is adopted in the braking stage in the model, the stator side is in short circuit by closing the stator side short circuit switch, the double-fed motor generates a counteractive electromagnetic torque in the rotor side converter excitation control link to reduce the rotating speed of the unit, and when the rotating speed of the double-fed motor is close to 0, the control of the rotor side converter is interrupted, so that a control signal is not generated any more, and the stator side short circuit switch is opened;
the method for realizing the simulation of the transition process of the working condition of the water pump comprises the following steps:
a. the water pump working condition starting simulation implementation method comprises the following steps: the starting of the working condition of the water pump is divided into three stages in the model, the first stage is a rotating speed rising stage, a short-circuit switch on the stator side is closed to carry out short circuit on the stator side of the double-fed motor, excitation control is put into a rotor side converter to generate reverse phase sequence current with constant magnitude and 60Hz to flow into the rotor side of the double-fed motor, and when the rotating speed reaches 1.1-1.2 times of synchronous speed, the control of the rotor side converter is switched to rotating speed control to enable the rotating speed to be stable; the second stage is a grid-connected preparation stage, the control of the converter at the rotor side is interrupted, no control signal is generated, and the short-circuit switch at the stator side is opened; the third stage is a voltage-regulating grid-connected stage, voltage at the stator side is regulated by adding voltage-regulating control to the rotor side converter, and a grid-connected switch is switched on when grid-connected conditions are met;
b. the method for realizing the simulation of the load increase/decrease and the steady-state operation of the working condition of the water pump comprises the following steps: the simulation of the stages is realized by adopting a rotation speed priority control strategy in the model, and when the load increase/decrease of the working condition of the water pump is realized by simulation, the reference value of the power is given in a step-shaped form of increasing/decreasing active power by tens of megawatts every several seconds;
c. the method for realizing the water pump working condition splitting shutdown simulation comprises the following steps: the simulation of realizing the normal stop of the water pump under the working condition can be divided into two stages, wherein the first stage is a disconnection stage, after the load shedding stage under the working condition of the water pump is finished, excitation control is put into the rotor-side converter to regulate the current of the stator side to be close to 0, and then the grid-connected switch is switched off; the second stage is a braking stage, an electric braking mode is still adopted when the stage is realized in a simulation mode, the stator side short-circuit switch is closed, an electromagnetic torque which generates a reaction effect by adding excitation control on the rotor side converter is added, so that the rotating speed of the unit is reduced, the control of the rotor side converter is interrupted until the rotating speed is reduced to 0, a control signal is not generated any more, and the stator side short-circuit switch is opened;
the simulation realization of the switching process between the working condition of the water turbine and the working condition of the water pump comprises the following steps:
a. the simulation implementation method for switching the working condition of the water turbine to the working condition of the water pump comprises the following steps: the simulation realization of the transition process of the working condition of the water turbine and the simulation realization of the transition process of the working condition of the water pump are connected by utilizing the switching phase-changing operation, the switching phase-changing operation is realized by 4 single-phase circuit breakers in the simulation, the three phases of a power supply ABC before phase-changing are connected with the three phases of the doubly-fed motor stator side ABC, the phase of the power supply A after phase-changing is connected with the phase of the doubly-fed motor stator side A, the phase of the power supply B is connected with the phase of the doubly-fed motor stator side C, and the;
b. the simulation implementation method for switching the working condition of the water pump to the working condition of the water turbine comprises the following steps: the transition process simulation realization of the water pump working condition is connected with the water turbine working condition transition process simulation realization by utilizing the switching phase-changing operation, the switching phase-changing operation is realized by 4 single-phase circuit breakers in the simulation, the power supply ABC three-phase is connected with the doubly-fed motor stator side ABC three-phase before the phase change, the power supply A phase is connected with the doubly-fed motor stator side A phase after the phase change, the power supply B phase is connected with the doubly-fed motor stator side C phase, and the power supply C phase is connected with the doubly-fed motor stator side B phase.
2. The working condition switching simulation implementation method of the pumped storage power station pump turbine and the doubly-fed motor according to claim 1, characterized by comprising the following steps of: the opening degree of the starting guide vane in the working condition of the water turbine is different according to the type and the water head of the pump water turbine.
3. The working condition switching simulation implementation method of the pumped storage power station pump turbine and the doubly-fed motor according to claim 1, characterized by comprising the following steps of: when the stable operation stage of the working conditions of the water turbine and the water pump is simulated, in order to observe the dynamic characteristic of the stable operation, a step of dozens of megawatts is added to a power instruction during the stable operation simulation, and the power step is subtracted after the power instruction reaches a stable state for a period of time, so that the dynamic characteristic of power response is observed.
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