Harmonic failure in the filter of Static Var Compensator

https://doi.org/10.1016/j.engfailanal.2019.104207Get rights and content

Highlights

  • A new methodology for engineering failure analysis associated harmonic in Static Var Compensator.

  • A new proposal for improvements the International Standards IEEE 519 for harmonic studies.

  • A real case study has been developed for the high voltage for failure analysis.

Abstract

The Static Var Compensator (SVC) is an important transmission component for the stability of the power system, it has 3 main components: Thyristor- controlled reactor (TCR), Thyristor-switched capacitor (TSC) and filters. The filters are the weakness part in this power system. In this kind of equipment, the worst problem associated with a filter failure is the harmonic damage in the power system, the currently international standards doesńt have enough information about the damage in the power system with high harmonic influence caused by SVC with the filter failure.

In this research the main scope is to provide a new assessment procedure for energy and industrial companies for the application of equipment on the utility system, it will illustrate the harmonic assessment levels, at the point of common coupling (PCC).

A real failure analysis is made for a better comprehension of the concepts of the PCC, it is very important to know the way of harmonic current flow and other parameters as: Average maximum demand load current, the short circuit ratio (SCR), the total demand distortion (TDD) and total harmonic distortion (THD). I will provide a better understanding and recommendation for the IEEE Standard 519, the dimension should address the time variations and the statistical characteristics of the harmonic levels. The harmonic is important due to levels, control on the utility system. This engineering failure analysis of the filter applications and interface with other energy companies.

Introduction

This research describes the study of harmonic performance of the SVC when the TCR is the considered harmonic source. The maximum voltage and current harmonic distortion on the 220 kV bus caused by harmonics generated by the TCR are calculated. All calculations are based on network harmonic impedance data described in Section 3. It is verified that the calculated highest distortions due to the TCR harmonic generation are within the limits specified [1].

In summary, the Harmonic Performance Study considers the following factors:

  • -

    Maximum allowed individual and total harmonic voltage distortion – due to TCR harmonic generation – shall not exceed the limits specified [2].

  • -

    Maximum allowed individual harmonic current distortion – due to TCR harmonic generation – shall not exceed the limits specified [3].

  • -

    Network harmonic impedance data [1].

  • -

    Manufacturing tolerances of the components [4].

  • -

    Capacitance variations due to changes in temperature [5].

  • -

    Negative-sequence voltage on the 220 kV bus.

  • -

    Maximum steady-state error on the TCR firing system [1].

  • -

    Filter tuning and resonances with power system [1].

The network impedance seen from the SVC connecting bus is one of the most important parameters affecting the filter design and performance, due to possible resonance phenomena between filters and network. As the network impedance will change over time due to different operating conditions, connection of loads and generators, and outages of main components [6], it is essential that the representation used in the studies covers the whole range of possible operating conditions [7]. Normally this is done by defining envelopes of impedances which encompasses all possible values that can reproduce the impedance of the network over a wide range of frequencies.

Section snippets

Harmonics in the power system

Theory for calculation of harmonic generation from a TCR and calculation of harmonic currents and voltages in the SVC caused by the TCR harmonic generation is described in Ref. [1].

It has provided system models in Power Factory format, representing the power system where the SVC is to be installed. Several cases of contingencies were considered. A frequency scan has been performed for each contingency. For 2019 three study cases has been considered; max, med and min load flow and one study case

Methodology for failure analysis

The new methodology proposed in this research should be apply for harmonic limits involves characterizing the harmonic sources, the assessment of the impact on the power energy system. It will permit to work for a better implementation of control, if necessary.

It could generate a cooperative effort of all the parties involved in the failure analysis and design problem with SVC, TCR, TSC and filters associated to the power system. Most outstandingly. Through the user, the manufacturer of

Case study

Harmonic impedances create impedance diagrams defined by the maximum and minimum impedance magnitude and the largest and smallest impedance angle. The results are presented in the following Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, they analyze the harmonic network impedance for N equal to 2 until 25.

The following factors

Conclusions

In this research, a new assessment procedure for harmonic failure analysis and design associated to SVC for energy and industrial have been illustrated, for the harmonic assessment levels, at the point of common coupling (PCC); this real failure analysis in Perú has developed a better understanding and recommendation for the IEEE Standard 519, in the Section 3.

This new procedure includes the Harmonic Performance Study considers the following factors:

  • -

    Maximum allowed individual and total harmonic

Declaration of Competing Interest

This paper does not have any conflict of interest.

Acknowledgement

Recognition to Universidad Nacional de San Agustín de Arequipa for support in the research.

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