The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-Bridge
Abstract
:1. Introduction
2. SVG Mathematical Model
Cascaded SVG Primary Circuit Topology
3. SVG Control Strategy Based on the DQ Coordinate System
3.1. Cascaded SVG Primary Circuit Topology
3.2. DC Side Voltage Balance Control Mechanism
3.3. Fuzzy-PI Controller
3.3.1. Fuzzy-PI Controller
3.3.2. Domain of Discourse and Membership Function
3.3.3. Establishment of the Fuzzy Rule Base
- (1)
- When the error E is too large, the response speed of the system will be slow, and KP should take a more significant value; at the same time, to ensure that the system does not have integral saturation and limit the necessary action, KI should take a smaller value.
- (2)
- When the error E is around medium size, KP should take a small value, and KI should take a significant discount to ensure the system response speed and control overshoot.
- (3)
- When the error E is too small, to avoid excessive error in the steady-state operation of the system and affect the control effect, KP and KI should take larger values.
3.3.4. Fuzzy Inference and Defuzzification
4. Simulation and Analysis
5. Conclusions
- (1)
- Compared with the traditional PI control, this paper is based on the fuzzy PI control voltage balance strategy, which significantly improves the response speed and accuracy of the DC-side voltage balance controller.
- (2)
- The overall system current DQ decoupling controls the output of the public active-duty cycle and reactive duty cycle, and the voltage balance controller increases the duty cycle correction on the common active-duty cycle component to achieve the effect of voltage balance.
- (3)
- While ensuring the constant voltage of the DC side, the DC side voltage balance controller does not have a coupling effect with the dual closed-loop control of the system, and the control structure is simple and easy to implement.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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EC | NB | NM | NS | ZE | PS | PM | PB | |
---|---|---|---|---|---|---|---|---|
E | ||||||||
NB | PB | PB | PM | PM | PS | ZE | ZE | |
NM | PB | PB | PM | PS | PS | ZE | NS | |
NS | PM | PM | PM | PS | ZE | NS | NS | |
ZE | PM | PM | PS | ZE | NS | NM | NM | |
PS | PS | PS | ZE | NS | NS | NM | NM | |
PM | PS | ZE | NS | NM | NM | NM | NB | |
PB | ZE | ZE | NM | NM | NM | NB | NB |
EC | NB | NM | NS | ZE | PS | PM | PB | |
---|---|---|---|---|---|---|---|---|
E | ||||||||
NB | NB | NB | NM | NM | NS | ZE | ZE | |
NM | NB | NB | NM | NS | NS | ZE | ZE | |
NS | NB | PM | NS | NS | ZE | PS | PS | |
ZE | NM | NM | NS | ZE | PS | PM | PM | |
PS | NM | NM | ZE | PS | PS | PM | NM | |
PM | ZE | ZE | PS | PS | PM | NM | PB | |
PB | ZE | ZE | PS | PM | NM | PB | PB |
Parameter | Quantity | Symbol |
---|---|---|
power voltage | 220 | V |
Number of H-bridges | 3 | piece |
grid frequency | 50 | HZ |
Filter inductor | 5 | mH |
DC side capacitance | 10,000 | μF |
DC side reference voltage | 500 | V |
DC side equivalent resistance | 50/100/150 | Ω |
DC side equivalent resistance | 220 | V |
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Gong, R.; Feng, Y. The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-Bridge. Electronics 2023, 12, 39. https://doi.org/10.3390/electronics12010039
Gong R, Feng Y. The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-Bridge. Electronics. 2023; 12(1):39. https://doi.org/10.3390/electronics12010039
Chicago/Turabian StyleGong, Renxi, and Yuan Feng. 2023. "The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-Bridge" Electronics 12, no. 1: 39. https://doi.org/10.3390/electronics12010039