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Design method for power system wide area PID damping controller suitable for stochastic time-delay

A damping controller and power system technology, applied in system integration technology, information technology support systems, instruments, etc., can solve the problems of complex parameter tuning methods and difficult PID controller parameter tuning.

Active Publication Date: 2015-12-02
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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  • Design method for power system wide area PID damping controller suitable for stochastic time-delay
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  • Design method for power system wide area PID damping controller suitable for stochastic time-delay

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Embodiment example

[0074] Implementation case: Simulation analysis of power system with four machines and two areas

[0075] Such as image 3 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 4 shown.

[007...

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Abstract

A design method for a power system time-delay PID damping controller comprises: determining a power system low-frequency oscillation mode; choosing a feedback control signal which reflects characteristics of inter-area low-frequency oscillation and a suitable damping control actuator; assessing possible stochastic time-delay distribution features of a wide area PMU signal; establishing a transfer function mathematical model of a wide area power system; designing a power system PID controller structure suitable for PMU signal stochastic time-delay situations; and separately calculating PID parameter distribution ranges which can ensure the stability of the power system at different time-delays, acquiring an intersection thereof and choosing a suitable set of PID parameters as parameters of the damping controller. The method provided by the present invention not only solves the inter-area low-frequency oscillation problem of the wide area power system, but also is applicable to time-delay situations of wide area feedback PMU signals and allows time-delays to change stochastically within a certain range. The designed controller is simple in structure and easy in engineering realization.

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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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 戚军欧林林周文委
Owner ZHEJIANG UNIV OF TECH
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