﻿ 三电平STATCOM新型直接功率控制策略研究 Research on Novel Direct Power Control Strategy of Three-Level STATCOM

Transmission and Distribution Engineering and Technology
Vol.04 No.01(2015), Article ID:15094,9 pages
10.12677/TDET.2015.41001

Research on Novel Direct Power Control Strategy of Three-Level STATCOM

Yiyan Zhang, Rui Gao, Yiming Xiao

Jiading Power Supply Company, State Grid Shanghai Municipal Electronic Power, Shanghai

Email: 24650185@qq.com

Received: Apr. 1st, 2015; accepted: Apr. 12th, 2015; published: Apr. 17th, 2015

ABSTRACT

The three-level STATCOM (static synchronous compensator) plays an important role in the reactive power compensation of the distribution system. In all of the control strategies of three-level STATCOM, traditional hysteresis direct power control (DPC) strategy has the characteristics of uncertain switching frequency which made the grid connected filter hard to design. In this paper, it presents a novel constant switching frequency direct power control strategy of three-level STATCOM. The novel strategy based on the mathematical model of three-level STATCOM, and three-level SVPWM strategy is used as modulation strategy. Using PI controller and instantaneous power feedforward and decoupling control, the novel strategy realizes constant switching frequency as while as good reactive compensation effect. Finally, the simulation verified the correctness and rationality of the proposed method.

Keywords:Three-Level STATCOM, Constant Switching Frequency Direct Power Control Strategy, Mathematical Model, Three-Level SVPWM, Feedforward and Decoupling Control

Email: 24650185@qq.com

1. 引言

2. 三电平STATCOM数学模型

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Figure 1. Equivalent circuit of three-level NPC rectifier

(8)

3. 三电平STATCOM新型直接功率控制策略

(9)

，考虑到则有：

(10)

4. 三电平STATCOM新型直接功率控制策略的控制器设计

4.1. 功率内环控制器设计

(11)

Figure 2. Fixed frequency DPC strategy of three-level STATCOM

(12)

4.2. 三电平STATCOM电压外环控制器设计

(13)

(14)

Figure 3. Power decoupling control of three-level STATCOM

(15)

(16)

(17)

4.3. 三电平STATCOM直流电容电压的均衡控制

5. 仿真验证

Figure 4. Voltage loop control of three-level STATCOM

Figure 5. Space voltage vectors of three-level SVPWM

Figure 6. Grid voltage and current before compensation

Table 1. Real-time calculation results of redundant vector effect time (the first sector)

Table 2. Key parameters of the simulation platform

Figure 7. Grid voltage and current after compensation

Figure 8. DC capacitor voltage of three-level STATCOM

Figure 9. Output power of three-level STATCOM

6. 结论

Research on Novel Direct Power Control Strategy of Three-Level STATCOM. 输配电工程与技术,01,1-10. doi: 10.12677/TDET.2015.41001

1. 1. 张波 (2012) 基于DSP的STATCOM系统软件设计. 硕士论文, 西安电子科技大学, 西安.

2. 2. 薛畅 (2009) 基于三电平拓扑结构的STATCOM的研究. 硕士论文, 哈尔滨工业大学, 哈尔滨.

3. 3. 张鑫 (2013) 配电变一体化三电平静止无功补偿装置. 硕士论文, 华中科技大学, 武汉.

4. 4. Akagi, H., Kanazawa, Y. and Nabae, A. (1984) Instantaneous reactive power compensators comprising switching devices without energy storage components. IEEE Transactions on Industry Application, 20, 625-630.

5. 5. Peng, F.Z. and Lai, J.S. (1996) Generalized instantaneous reactive power theory for three-phase power systems. IEEE Transactions on Instrumentation and Measurement, 45, 293-297.

6. 6. 刘进军, 王兆安 (1998) 瞬时无功功率与传统功率理论的统一数学描述及物理意义. 电工技术学, 13, 6-12.

7. 7. Takahashi, I. and Noguchi, T. (1986) A new quick-response and high-efﬁciency control strategy of an induction motor. IEEE Transactions on Industry Applications, 22, 820-827.

8. 8. Depenbrock, M. (1988) Direct self-control (DSC) of inverter-fed induction machine. IEEE Transactions on Power Electronics, 3, 420-429.

9. 9. Oh-nishi, T. (1991) Three phase PWM converter/inverter by means of instantaneous active and reactive power control. In-ternational Conference on Industrial Electrlnics, Control and Instrumentation, Kobe, 28 October-1 November 1991, 819-824.

10. 10. Noguchi, T., Tomiki, H., Kondo, S. and Takahashi, I. (1998) Direct power control of PWM converter without power- source voltage sensors. IEEE Transactions on Industry Applications, 34, 473-479.

11. 11. 杨达亮, 卢子广, 杭乃善, 李国进 (2011) 三相电压型PWM整流器准定频直接功率控制. 中国电机工程学报, 31, 66-73.

12. 12. 李爽, 王志新, 王国强 (2013) 海上风电柔性直流输电变流器P-DPC控制研究. 电工技术学报, 28, 264-269.

13. 13. 陈伯时 (2005) 电力拖动自动控制系统. 机械工业出版社, 北京.