Method for estimating position of rotor in using static frequency converter technology to start pumped storage unit

A pumped storage unit, static frequency conversion technology, applied in the direction of electronic commutator, etc., can solve the problems that cannot be directly applied, and achieve the effects of saving costs, improving system reliability, high rationality and accuracy

Active Publication Date: 2017-01-04
NARI TECH CO LTD +1
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Therefore, this method c

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  • Method for estimating position of rotor in using static frequency converter technology to start pumped storage unit
  • Method for estimating position of rotor in using static frequency converter technology to start pumped storage unit
  • Method for estimating position of rotor in using static frequency converter technology to start pumped storage unit

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[0018] Please combine figure 1 and figure 2 As shown, this method discloses a method for estimating the rotor position of a pumped-storage unit at a static frequency conversion start, which includes the following four parts: 1. Modeling-model discrete linearization; 2. Initialization; 3. Rotor position estimation in the low-frequency phase of starting ; 4. Control signal output. Can refer to figure 1 The principle block diagram of doubly-fed motor rotor position estimation is understood. Specifically, the method can be implemented through the following steps:

[0019] First, establish the mathematical model of the pumping unit motor and write the state space expression shown in equation (1):

[0020] x · = f ( x ) + B v + w - - - ( 1 a )

[0021] y=h(x)+v (1b)

[0022] among them,

[0023] Where

[0024] B = 0 0 0 1 σL s 0 - L m σL s L f 0 1 L s 0 ...

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Abstract

The invention discloses a method for estimating the position of a rotor in using static frequency converter technology to start a pumped storage unit. The method obviates the need for an accurate motor model, can accurately estimate the position of a rotor at a low-speed stage of starting. The method includes the following steps: modeling a pumped storage unit, conducting disperse linearization, adopting the rolling horizon estimation method in a constructed equation of state, by designating an initial motor quantity of state, a rolling horizon window length and restraining conditions, within the rolling horizon window length, establishing a full information rolling horizon estimation optimization problem and resolving a result; and when the window length is exceeded, introducing an arrival cost function to establish an approximate rolling horizon estimation, resolving the optimization problem to obtain the estimation value of the system state. According to the invention, the method has simple principles and clear-cut logic, can accurately estimate the system state by resolving the optimization problem of the equivalency of the equation of state.

Description

technical field [0001] The invention relates to a method for estimating the rotor position of a motor. Background technique [0002] The pumped storage power station has the functions of peak regulation, valley filling, frequency regulation, phase regulation and emergency backup. It is a very important energy storage method in the operation and control of large power grids. The generator / motor used in the pumped storage power station is a reversible three-phase salient pole synchronous motor that can be used as both a generator and a motor. The starting method of the pump under the working condition is considered in the electrical design of the pumped storage power station One of the most important questions. With the rapid development and increasing maturity of modern power electronic technology, the method of starting pumped storage units by static frequency converter (Static Frequency Convertor, SFC) has gradually occupied a dominant position. [0003] Among the key tec...

Claims

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Application Information

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IPC IPC(8): H02P6/18
CPCH02P6/18
Inventor 纪历邵宜祥周百灵石磊周敏王舒朱丹王琴
Owner NARI TECH CO LTD
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