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Self-adaptive current control method of pumped storage static frequency converter

A static frequency converter and current control technology, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., and can solve problems such as startup failure, startup overtime, and improper current control

Active Publication Date: 2021-06-22
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a self-adaptive current control method of pumped storage static frequency converter, which can solve the problem of improper current control during the start-up process of the pumped storage system, resulting in start-up timeout and final start-up failure. The starting success rate of the energy storage variable frequency starting system provides a theoretical basis and provides a guarantee for the localized research and development of starting static frequency converters

Method used

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  • Self-adaptive current control method of pumped storage static frequency converter

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Embodiment 1

[0039] see figure 1 , a method for self-adaptive current control of a pumped storage static frequency converter, comprising the following steps:

[0040] 1) The inverter for static start of pumped storage is composed of input reactor, rectifier bridge, DC reactance and inverter bridge. At the same time, it cooperates with the excitation system and control protection system to complete the soft start of the inverter for the entire pumped storage unit.

[0041] 2) The current flows from the power grid side through the transformer into the static inverter, and then flows into the rectifier bridge after being filtered by the input reactor. It is converted into alternating current and input to the stator side of the motor, so as to realize the function of soft start with frequency change.

Embodiment 2

[0043] see figure 1 , figure 2, a method for self-adaptive current control of pumped-storage static frequency converters, the start-up control strategy of the static frequency converter comprises the following steps:

[0044] 1) The rectifier unit receives the signal of the current controller to adjust the magnitude of the DC current.

[0045] 2) The current controller signal is obtained from the comprehensive calculation of the CT sampling current on the AC input side, the calculated value of the start-up time, and the speed regulator exceeding the threshold.

[0046] 3) The actual speed is judged by the threshold. When the speed exceeds the threshold, the actual start-up time is calculated, and the actual start-up time is compared with the planned start-up time to determine whether the actual start-up time is over. If it is overtime, reverse the time to adjust the DC current and increase the torque, so as to complete the variable frequency start within the planned time. ...

Embodiment 3

[0049] see image 3 , Figure 4 , through the comparison of the theoretical start-up curve and the measured start-up curve, when the pumped storage unit is started using this method, the speed of the unit can maintain a uniform increase during the start-up process, and it is basically free from fluctuations due to external physical factors. Therefore, this method can be effective Improve the start-up success rate of the pumped storage unit.

[0050] see Figure 5 , the v / f curve during the start-up process, the curve shows that during the start-up process, the voltage and frequency ratio maintains a relatively stable state with less fluctuation. It shows that the starting stability of the unit is better.

[0051] Compared with the prior art, this embodiment has the following beneficial effects:

[0052] 1) This method can not only be used for the static variable frequency start of large pumped storage units, but also can be extended to the variable frequency start of relat...

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Abstract

The invention discloses a self-adaptive current control method of a pumped storage static frequency converter, which comprises the following steps: the current flows into the static frequency converter from the grid side through a transformer, and flows into the rectifier bridge of the rectifier unit after being filtered by an input reactor, and the rectifier bridge converts the alternating current After being filtered by the DC reactance, it flows into the inverter bridge of the inverter unit. The inverter bridge inverts the incoming DC current into AC power and inputs it to the stator side of the motor, so as to realize the soft start of the motor frequency change. This method can solve the problem of starting overtime caused by improper current control during the start-up process of the pumped storage system, and finally fails to start. It provides a theoretical basis for improving the start-up success rate of the pumped-storage variable frequency start-up system, and provides a theoretical basis for the localization of the start-up static frequency converter. Guarantees are provided.

Description

technical field [0001] The invention relates to a control method of a unit, in particular to a self-adaptive current control method of a pumped storage static frequency converter. Background technique [0002] As the most important way of electric energy storage, pumped storage has the advantages of large capacity, high economy per unit capacity of energy storage, and long service life. Pumped storage power plants have multiple uses for power systems such as peak regulation, valley filling, frequency modulation, phase modulation, and emergency backup. With the large-scale integration of new energy sources such as wind energy and solar energy into the power system, pumped storage will surely gain more room for development, and at the same time play a more important role in the safe and stable operation of the power system. [0003] The pumped storage static start static frequency converter mainly adopts high-voltage high-power thyristor series-parallel technology, digital co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26
CPCH02P1/26
Inventor 付建忠梁国辉刘英军俞斌姬联涛李赫明孟德霞康旭毕旭马小亮苏小娟
Owner STATE GRID CORP OF CHINA