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Non-linearity PI voltage control method of stillness reactive compensator

A technology of static var compensation and voltage control method, which is applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, control/regulation system, etc., can solve the problems of complex control system and low control precision, and achieve easy algorithm , enhanced adaptability and simple structure

Inactive Publication Date: 2008-04-16
HUNAN UNIV
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Problems solved by technology

[0004] In order to solve the technical problems of low control precision and complicated control system of existing static var compensators, the present invention provides a non-linear PI voltage control method

Method used

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  • Non-linearity PI voltage control method of stillness reactive compensator
  • Non-linearity PI voltage control method of stillness reactive compensator
  • Non-linearity PI voltage control method of stillness reactive compensator

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Embodiment Construction

[0025] As shown in Figure 1, the SVC system structure diagram is composed of a star-connected mechanical switched capacitor bank (MSC) and a delta-connected thyristor-controlled reactor (TCR). After the current sensor is detected, it is input to the DSP control board after being sampled by MAX125, and the control signal is generated by the voltage controller shown in Figure 2, which is transmitted to the site through the optical fiber, and the I / O corresponding to MSC and TCR is generated by the trigger circuit signal and PWM signal, respectively control the on-off of MSC and the conduction angle of TCR. MSC coarse adjustment provides capacitive reactive power with step difference, TCR produces continuously adjustable inductive reactive power, and the combination of the two produces continuously adjustable capacitive reactive power and inductive reactive power. The specific process is: through real-time detection of reactive power of the grid load, According to the need of rea...

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Abstract

The present invention discloses a nonlinear PI voltage control method of a static reactive compensator, which includes the following steps: detecting and sampling the compensation current Isvc output by the static reactive compensator and calculating the compensation voltage VsL, sampling meansquare value Vrms of the power network voltage; calculating the difference value delta V between the voltage set value Vref and the compensation voltage VsL and system voltage Vrms; getting the control guide signal Bmsc and Btcr of mechanical threw cut capacitor and thyristor control reactor after the difference value delta V passes through an optimal nonlinear PI controller; getting logical pwl signal and angle control signal from the control guide signal Bmsc and Btcr; and sending the logical pwl signal and angle control signal to a trigger circuit and controlling the input amount of the reactor and the capacitor by the static reactive compensator. The present invention controls the static reactive compensator voltage by nonlinear PI. The responsive speed of the nonlinear PI distinctly outperforms the responsive speed of the prior PI, thereby solving the problem of overshoot of controlled variable and realizing fast and non-overshoot traction of voltage set value of SVC system with good active and static performance.

Description

technical field [0001] The invention relates to a control method of a static var compensator, in particular to a nonlinear PI voltage control method of a static var compensator. Background technique [0002] Voltage quality is an important power quality problem, which will cause huge economic losses to power companies and power users, and will pose a threat to the safety, stability and economic operation of the power grid. An effective way to solve voltage quality problems is to install static var compensation devices in the power grid. Since the static var compensator (SVC) was put into commercial operation in the 1970s, SVCs have been put into operation in various countries in the world for more than 30 years, and considerable benefits have been obtained. It is an important and effective means of dynamic voltage support and reactive power compensation in power systems. It is used to compensate reactive power in power supply networks, improve voltage unbalance, and suppres...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/16G05F1/70
CPCY02E40/34Y02E40/30
Inventor 罗安徐先勇帅智康李锋刘定国赵伟
Owner HUNAN UNIV
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