Modeling and Current Control Strategy for a Medium-voltage Cascaded Multilevel STATCOM with LCL Filter
Abstract
The Static Synchronous Compensator (STATCOM a.k.a. SVG) is widely used to regulate dynamic reactive powerand to solve dynamic voltage stability problems. Modeling shows that a cascaded STATCOM, which is composedof several cascaded H-bridges, not only has strong coupling characteristics when an LCL filter is added but it is alsoa non-linear, multivariable system. Therefore, its practical design and application are dicult to implement. In thispaper an internal decoupling control algorithm is introduced to provide independent control of the active and reactivecurrents. Decoupling control algorithms are proposed, and models and simulation of the decoupling are provided. Wedescribe the setting up of a simulation and experiments with a cascaded STATCOM based on combined circuit topologywith a multi-field programmable gate array (FPGA), and double-loop control algorithms with a current inner loop, anda capacitor voltage outer loop. To provide control of the current inner loop, proportional-integral (PI) and resonantcontrollers are used, having the control ability to cancel harmonics while compensating for the reactive power. Thispaper presents new current-tracing control models that compensate for the fundamental current and eliminate selectiveharmonics by adopting a d-q synchronous reference frame, and a discrete Fourier transform (DFT). Voltage balanceis realized by introducing modulation wave distribution strategies. Furthermore, both simulation and experiments areemployed to verify the feasibility and eectiveness of the control strategy.References
[1] Yao Zhiqing, Zhao Qian, Liu Ximei.: Research on grid-connected technology of inverter based on quasi synchronous principle: Power System Protection and Control 39(24)(2011)123-126.
[2] Singh B., Saha R., Chandra A., et al.: Static synchronous compensators (STATCOM): Power Electronic 2(4)(2009)297-324.
[3] Liu Fei, Duan Shanxu, Zha Xiaoming.: Design of two-loop controller in a grid-connected inverter with LCL filters: Proceedings of the CSEE 29(12)(2009)234-240.
[4] Zhang Dongjiang, Qiu Zhiling, Li Yuling.: Shunt active power filter with high steady-state performance based on LCL-filter: Transactions of China Electrotechnical Society 29(12)(2009)234-240.
[5] Zhang Xing, Shao Wenchang, Yang Shuying.: Multi-loop control scheme of a grid side converter with LCL-filter: Journal of HeFei University of Technology 32(7)(2005)72-76.
[6] Zhang Xianping, Lin Zixu, Li Yaxi.: A novel control strategy for PWM rectifier with LCL filter: Transactions of China Electrotechnical Society 22(2)(2007)74-77.
[7] Leskover S., Marchesini M.: Control techniques for DC-link voltage ripple minimization in cascaded multilevel converter structures: Power Electronics and Application (EPE). Germany:European Power Electronics Association (2005)23-32.
[8] Wei Wenhui, Liu Wenhua, Song Qiang.: Research on fast dynamic control of static synchronous compensator using cascade multilevel inverters: Proceedings of the CSEE 25(2)(2005)23-26.
[9] Liserre M., Teodorescu., Blaabjerg F.: Multiple harmonics control for three-phase grid converter systems with the use of PI-RES current controller in a rotating frame: Power Electron 21(3)(2006)836-841.
[10] Liu Chunxi, Ma Weiming, Sun Chi.: Design of output LC filter and low order harmonics suppression in high power 400Hz inverter: Transactions of China Electrotechnical Society 26(6)(2011)129-137.
[11] Sozański K P.: Sliding DFT control algorithm for three-phase active power filters: Applied Power Electronics Conference and Exposition, Twenty-First Annual IEEE. USA:IEEE (2006)1223-1229.
[12] Li Yidan, Lu Wensheng, Peng Xiuyan.: DC voltage measurement and control for cascaded STATCOM: Proceedings of the CSEE 31(1)(2011)14-19.
[13] Liu Wenhua, Song Qiang, Teng Letian.: Balancing control of DC voltages of 50MVA STATCOM on cascade multilevel inverters: Proceedings of the CSEE 24(4)(2004)145-150.
[14] Ren Mingwei, Sun Yukun.: Voltage balance control of DC capacitors of 11-level cascade STATCOM: Automation of Electric Power Systems 4(6)(2010)10-15.
[15] Hu Yinghong, Ren Jiajia, Wang Jianze.: Balancing control method of DC voltage of cascaded H-bridge STATCOM: Electric Machines and Control 14(11)(2010)31-36.
[2] Singh B., Saha R., Chandra A., et al.: Static synchronous compensators (STATCOM): Power Electronic 2(4)(2009)297-324.
[3] Liu Fei, Duan Shanxu, Zha Xiaoming.: Design of two-loop controller in a grid-connected inverter with LCL filters: Proceedings of the CSEE 29(12)(2009)234-240.
[4] Zhang Dongjiang, Qiu Zhiling, Li Yuling.: Shunt active power filter with high steady-state performance based on LCL-filter: Transactions of China Electrotechnical Society 29(12)(2009)234-240.
[5] Zhang Xing, Shao Wenchang, Yang Shuying.: Multi-loop control scheme of a grid side converter with LCL-filter: Journal of HeFei University of Technology 32(7)(2005)72-76.
[6] Zhang Xianping, Lin Zixu, Li Yaxi.: A novel control strategy for PWM rectifier with LCL filter: Transactions of China Electrotechnical Society 22(2)(2007)74-77.
[7] Leskover S., Marchesini M.: Control techniques for DC-link voltage ripple minimization in cascaded multilevel converter structures: Power Electronics and Application (EPE). Germany:European Power Electronics Association (2005)23-32.
[8] Wei Wenhui, Liu Wenhua, Song Qiang.: Research on fast dynamic control of static synchronous compensator using cascade multilevel inverters: Proceedings of the CSEE 25(2)(2005)23-26.
[9] Liserre M., Teodorescu., Blaabjerg F.: Multiple harmonics control for three-phase grid converter systems with the use of PI-RES current controller in a rotating frame: Power Electron 21(3)(2006)836-841.
[10] Liu Chunxi, Ma Weiming, Sun Chi.: Design of output LC filter and low order harmonics suppression in high power 400Hz inverter: Transactions of China Electrotechnical Society 26(6)(2011)129-137.
[11] Sozański K P.: Sliding DFT control algorithm for three-phase active power filters: Applied Power Electronics Conference and Exposition, Twenty-First Annual IEEE. USA:IEEE (2006)1223-1229.
[12] Li Yidan, Lu Wensheng, Peng Xiuyan.: DC voltage measurement and control for cascaded STATCOM: Proceedings of the CSEE 31(1)(2011)14-19.
[13] Liu Wenhua, Song Qiang, Teng Letian.: Balancing control of DC voltages of 50MVA STATCOM on cascade multilevel inverters: Proceedings of the CSEE 24(4)(2004)145-150.
[14] Ren Mingwei, Sun Yukun.: Voltage balance control of DC capacitors of 11-level cascade STATCOM: Automation of Electric Power Systems 4(6)(2010)10-15.
[15] Hu Yinghong, Ren Jiajia, Wang Jianze.: Balancing control method of DC voltage of cascaded H-bridge STATCOM: Electric Machines and Control 14(11)(2010)31-36.
Published
2015-03-27
How to Cite
ZHAO, Xuehua et al.
Modeling and Current Control Strategy for a Medium-voltage Cascaded Multilevel STATCOM with LCL Filter.
Journal of Power Technologies, [S.l.], v. 95, n. 1, p. 1--13, mar. 2015.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/664>. Date accessed: 20 apr. 2024.
Issue
Section
Energy Engineering and Technology
Keywords
Cascaded H-bridge; Internal model decoupling; Resonant controller; Distribution of modulation; Double-loop control
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
