Electric power system wide-area PID damping controller with large-range-change time-lag self-adaptive ability and design method thereof

A damping controller and power system technology, applied in system integration technology, information technology support system, reducing/preventing power oscillation, etc., can solve the problems of complex parameter setting methods and difficult parameter setting, etc., and achieve easy engineering realization , the effect of simple structure

Inactive Publication Date: 2015-12-30
STATE GRID ZHEJIANG ELECTRIC POWER +2
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  • Abstract
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  • Application Information

AI Technical Summary

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 large-scale change of the time lag is to be considered, the parameter tuning of the PID controller will be even more difficult.

Method used

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  • Electric power system wide-area PID damping controller with large-range-change time-lag self-adaptive ability and design method thereof
  • Electric power system wide-area PID damping controller with large-range-change time-lag self-adaptive ability and design method thereof
  • Electric power system wide-area PID damping controller with large-range-change time-lag self-adaptive ability and design method thereof

Examples

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Embodiment example

[0061] Implementation case: Simulation analysis of power system with four machines and two areas

[0062] 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.

[006...

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Abstract

The invention relates to an electric power system time-lag PID damping controller and belongs to the technical field of electric power system stable control. The wide-area PID damping controller with the large-range-change time-lag self-adaptive ability is designed for the low-frequency oscillation problem and the PMU signal time-lag large-range-change phenomenon occurring in the regional power grid interconnection process of a wide-area electric power system, and a selecting method for PID control parameters is provided. The wide-area PID damping controller comprises a wide-area measuring signal preprocessing module, a time-lag comparator, a proportional (P) link, an integral (I) link, a differential (D) link, a PID parameter storage module, a PID parameter selecting reset module and an output amplitude limiting link. According to the strategy for actual time-lag PID parameter online selection, PMU feedback control signal time lag is allowed to change within the large range, and the designed controller is simple in structure, and easy to realize in an engineering mode.

Description

Technical field: [0001] The invention relates to a time-delay PID damping controller of 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 observability of contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 吴秋晗戚军魏路平江全元占震滨李永杰杨博
Owner STATE GRID ZHEJIANG ELECTRIC POWER
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