A new control strategy for distributed static compensators considering transmission reactive flow constraints
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The document presents a control strategy for distributed static compensators (DSTATCOM) that utilizes a slow reset regulator (SRR) for voltage control in transmission systems, particularly when integrating renewable energy sources. This approach ensures the DSTATCOM maintains steady state output and optimizes reactive power reserves, reducing losses during dynamic events. Additionally, it includes a new algorithm for calculating operational constraints based on VAR flow in the transmission system.
A new control strategy for distributed static compensators considering transmission reactive flow constraints
- 1. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 1 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com A New Control Strategy for Distributed Static Compensators Considering Transmission Reactive Flow Constraints Abstract Te concept of the slow reset regulator (SRR) has been proposed or used for some FACTS device such as static VA compensators (SVC) or static compensator (STATCOM) for system voltage control applications. The new control strategy applies a slow reset regulator (SRR) to slowly bias the VAr set point of the DSTATCOM master controller to maintain its steady state output within a target bandwidth. The operating result maintains an appropriate VAr reserve level from the DSTATCOM for dynamic events in the system. This paper also presents a new algorithm to calculate the operating constraints of the SRR that reflect the VAr flow at the local or remote point in the transmission system and the allowable VAr thresholds for that flow.
- 2. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 2 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Proposed system A modeling block diagram of the DSTATCOM master controller in the Q-control mode with the SRR (red lines) and interface to a transmission system where multiple renewable power plants are also connected. This figure represents an engineering application at a wind generation hub where the transmission operator usually requires a minimum impact on voltage and VAr flow caused by the variable wind generation. In the diagram, the DSTATCOM is configured to control the VAr flow at the point of interconnection (POI) of the renewable plants, which is a 230 kV bus in the transmission system miles away from the plant location. This control configuration can also be used for any other transmission applications where the VAr flow at a local or remote point in the system needs to be regulated. For example, the change in power transfer (import or export) between two areas may cause VAr flow swings and hence large reactive losses in the transmission system. In this case, the VAr flows on the transfer paths of the transmission system may be controlled by substation-based DSTATCOM systems with similar control configurations.
- 3. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 3 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Advantages Maintain its steady state output within a target bandwidth. Maximize its VAr reserve for dynamic events and reduce equipment and associated system operating losses.
- 4. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 4 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Block diagram PLANT 1 PLANT 2 SSD L-C-L FILTER THREE PHASE VSI DC LINK CAPACITOR INPUT DC SUPPLY THREE PHASE DRIVER PIC CONTROLLER WITH BUFFER 5V DC 12V DC LOAD
- 5. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 5 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Tools and software MPLAB – microcontroller programming. ORCAD – circuit layout. MATLAB/Simulink – Simulation.