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Wide-area time-lag PID damping controller design method of electric system

A damping controller, power system technology, applied in system integration technology, information technology support system, reducing/preventing power oscillation, etc., can solve the problems of PID controller parameter tuning more difficult, complicated parameter tuning method, etc.

Active Publication Date: 2015-11-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

The structure and algorithm of the PID controller are simple and widely used, but the parameter tuning method is complicated. If the influence of time lag is to be considered, the parameter tuning of the PID controller will be even more difficult.

Method used

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  • Wide-area time-lag PID damping controller design method of electric system
  • Wide-area time-lag PID damping controller design method of electric system
  • Wide-area time-lag PID damping controller design method of electric system

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Embodiment example

[0063] Implementation case: Simulation analysis of power system with four machines and two areas

[0064] Such as Figure 4 In the four-machine two-area power system shown, generators G1 and G2 are located in area 1, and generators G3 and G4 are located in area 2. The two areas are interconnected by a long tie line, and area 1 transmits active power to area 2 through the long tie line. Through the analysis of the small disturbance stable characteristic root, it can be seen that there are three low-frequency oscillation modes in the system, as shown in Table 1. Mode 1 is an interval low-frequency oscillation mode, and G1 and G2 in area 1 have low-frequency power relative to G3 and G4 in area 2. Oscillation, the oscillation frequency is 0.5389Hz, and the damping value is 0.0099. Because the damping value is very small, once the system is disturbed, it will oscillate violently for a long time, and the power oscillation curve of the tie line is as follows Figure 5 shown.

[00...

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Abstract

The invention provides a wide-area time-lag PID damping controller design method of an electric system, and belongs to the field of electric system stabilization control technology. The complete design method is provided in order to solve a problem of low frequency oscillation occurring in the interconnection process of a regional power grid of a wide-area electric system. The design method comprises steps of determining the low frequency oscillation mode of the electric system; selecting a feedback control signal representing the low frequency oscillation characteristic and a proper damping control executer; establishing a transfer function mathematical model of the wide-area electric system; designing an electric system PID controller suitable for feedback control of time-lag PWM signals; and calculating a possible PID parameter distribution range which is capable of ensuring stability of the electric system and selecting a proper PID parameter therefrom. According to the invention, the problem of low frequency oscillation in area of the wide-area electric system is can be solved and the design method is applicable when there are time lags in a wide-area feedback PWM signal. The designed controller has a simple structure and easy to achieve in projects.

Description

Technical field: [0001] The invention relates to a design method of a time-delay PID damping controller in a power system, and belongs to the technical field of power system stability control. Background technique: [0002] With the interconnection of regional power grids, the scale of the power system continues to expand, and the problem of low-frequency oscillation is becoming more and more serious. How to ensure that the power system under the UHV interconnection of the large regional power grid has a high damping coefficient has become an urgent control problem to be solved for the safe and stable operation of the modern power system. [0003] Due to the interconnection of large regional power grids, the low-frequency oscillations may involve multiple regional power grids at the same time, and the distribution is very wide and the impact is also great. Traditional power system stability controllers (PSS) that use local signals as feedback signals are limited by the obse...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 戚军欧林林张有兵洪学劲峰
Owner ZHEJIANG UNIV OF TECH
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