Grid Voltage Balancing Strategy Based on Per-Phase-Controlled Inverters

2021 ◽  
Author(s):  
Hao-Chun Hsu ◽  
Nien-Ting Chung ◽  
Yaow-Ming Chen ◽  
Chih-Chao Hsu
Keyword(s):  
Voltage Balancing ◽  
Grid Voltage

scholarly journals Inter-cluster voltage balancing control of a delta connected modular multilevel cascaded converter under unbalanced grid voltage

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Oghenewvogaga J. K. Oghorada ◽  
Li Zhang ◽  
Huang Han ◽  
Ayodele B. Esan ◽  
Mingxuan Mao
Keyword(s):  
Flow Analysis ◽  
Accurate Method ◽  
Voltage Balancing ◽  
Grid Voltage ◽  
Control Scheme ◽  
Cascaded Converter ◽  
Capacitor Voltage ◽  
Injection Methods ◽  
Cluster Methods ◽  
Unbalanced Grid

AbstractA new inter-cluster DC capacitor voltage balancing scheme for a delta connected modular multilevel cascaded converter (MMCC)-based static synchronous compensator (STATCOM) is presented. A detailed power flow analysis of applying negative sequence current (NSC) and zero-sequence current (ZSC) injection methods in addressing the issue of inter-cluster DC voltage imbalance under unbalance grid voltage is carried out. A control scheme is proposed which integrates both inter-cluster methods using a quantification factor QF. This is used to achieve the sharing of the inter-cluster active power between the NSC and ZSC injection methods. An accurate method of determining the quantification factor is also presented. The proposed method offers better sub-module DC capacitor voltage balancing and prevents converter overcurrent. The influence of unbalanced grid voltage on the delta connected MMCC-based STATCOM rating using this integrated cluster balancing technique is investigated. The control scheme is verified with a 5 kV 1.2MVA MMCC-STATCOM using 3-level bridge sub-modules, and the results show the advantages of the proposed method over other inter-cluster methods.

DC Capacitor Voltage Balancing Control for Cascaded STATCOM

2013 ◽  
Vol 325-326 ◽  
pp. 1221-1224 ◽  
Author(s):  
Sheng Qing Li ◽  
Wen Xiang Xu ◽  
Wei Zhou Li ◽  
Huan Yue Zeng
Keyword(s):  
Phase Information ◽  
Static Synchronous Compensator ◽  
Voltage Balancing ◽  
Grid Voltage ◽  
Voltage Unbalance ◽  
Capacitor Voltage ◽  
Average Distribution ◽  
Voltage Phase ◽  
Simulation Results ◽  
Balancing Control

Through the DC side capacitor voltage unbalance problem of cascaded static synchronous compensator. Put through a theory of active voltage average distribution to balance DC capacitor voltage, using master slave controller to realize controlling requirements. The main controller calculates each phase AC side of H bridge required total active and reactive voltage and grid voltage phase information etc, The slave controller complete each cascade module for active voltage average distribution control. The simulation results show that the method is feasible and effective.

scholarly journals A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2262 ◽  
Author(s):  
Hua Han ◽  
Chao Luo ◽  
Xiaochao Hou ◽  
Mei Su ◽  
Wenbin Yuan ◽  
...  
Keyword(s):  
Decentralized Control ◽  
Cost Effective ◽  
Current Control ◽  
Control Mode ◽  
Communication Link ◽  
Grid Voltage ◽  
Point Tracking ◽  
Pv Inverter ◽  
Communication Links ◽  
Voltage Phase

For an AC-stacked photovoltaic (PV) inverter system with N cascaded inverters, existing control methods require at least N communication links to acquire the grid synchronization signal. In this paper, a novel decentralized control is proposed. For N inverters, only one inverter nearest the point of common coupling (PCC) needs a communication link to acquire the grid voltage phase and all other N − 1 inverters use only local measured information to achieved fully decentralized local control. Specifically, one inverter with a communication link utilizes the grid voltage phase and adopts current control mode to achieve a required power factor (PF). All other inverters need only local information without communication links and adopt voltage control mode to achieve maximum power point tracking (MPPT) and self-synchronization with grid voltage. Compared with existing methods, the communication link and complexity is greatly reduced, thus improved reliability and reduced communication costs are achieved. The effectiveness of the proposed control is verified by simulation tests.

Analysis of Power Grid Voltage Stability with High Penetration of Solar PV Systems

2021 ◽  
pp. 1-1
Author(s):  
Sharmin Rahman ◽  
Sajeeb Saha ◽  
Shama Naz Islam ◽  
M Arif ◽  
Mehdi Mosadeghy ◽  
...  
Keyword(s):  
Voltage Stability ◽  
Power Grid ◽  
Solar Pv ◽  
Grid Voltage ◽  
Pv Systems ◽  
High Penetration
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