电-氢多能互补型微电网的VSG平衡电流控制方法

陈维荣; 于瑾; 李奇; 蒲雨辰; 杨寒卿; 韩莹

doi:10.3969/j.issn.0258-2724.20180860

电-氢多能互补型微电网的VSG平衡电流控制方法

doi: 10.3969/j.issn.0258-2724.20180860

基金项目: 四川省科技计划（应用基础面上项目）（19YYJC0698）

详细信息

作者简介:
陈维荣（1965—），男，教授，博士生导师，研究方向为电力系统及其自动化、工业监控技术、智能信息处理、燃料电池技术及应用，E-mail：wrchen@swjtu.cn

通讯作者:
李奇(1984—)，男，教授，博士生导师，研究方向为轨道交通新能源技术、综合能源系统运行与控制等，E-mail：liqi0800@163.com

中图分类号: V221.3
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出版历程
- 收稿日期: 2018-10-29
- 修回日期: 2019-03-06
- 网络出版日期: 2019-06-13
- 刊出日期: 2019-12-01

Balanced Current Control Method for Virtual Synchronous Generator in Electro-Hydrogen Multi-Energy Complementary Microgrid

摘要

摘要: 多能互补型微电网将具有互补性的多种能源集中于同一并网系统，可有效提高微电网的能源利用效率及供电可靠性. 虚拟同步发电机（virtual synchronous generator，VSG）技术，实现分布式电源的友好并网. 然而，在非理想运行情况下，当电网电压出现不平衡时，传统的VSG控制不具备抑制负序电流的能力，将导致微电网三相并网电流不平衡，因此提出一种基于电-氢多能互补型微电网的VSG平衡电流控制方法. 本文搭建了包含光伏及储能系统的电能系统模型，和包含电解槽-氢储能-燃料电池系统的氢能系统模型；分析了VSG的基本原理，通过VSG并网小信号模型的分析，对控制参数进行了设计，提高了系统的稳定裕度；定量分析了不平衡电流的产生原因，通过改进dq坐标系下电流指令计算方法，抑制了负序电流，保证电-氢多能互补型微电网的电能质量. 最后仿真验证了多能互补微电网能量管理策略的有效性，仿真结果证明VSG平衡电流控制方法能在电压不平衡情况下实现并网电流三相平衡，最终将冲击电流由52 A抑制至27 A，并显著减小了功率波动.
- 多能互补 /
- 虚拟同步发电机 /
- 不平衡电压 /
- 虚拟阻抗
Abstract: The multi-energy complementary microgrid concentrates multiple complementary energy sources in the same grid-connected system, which can effectively improve energy utilization efficiency and power supply reliability of the microgrid. Virtual synchronous generator (VSG) technology enables friendly networking of distributed power supplies. However, in the case of non-ideal operation, the traditional VSG control does not have the ability to suppress the negative sequence current when the grid voltage is unbalanced, which will lead to the imbalance of the three-phase grid-connected current of the microgrid. To solve this problem, a VSG balanced current control method based on electro-hydrogen multi-energy complementary microgrid is proposed. This work builds a power system model including photovoltaic and energy storage systems, and a hydrogen energy system model including an electrolytic cell-hydrogen storage-fuel cell system. Then, the basic principle of VSG is analyzed, and through the analysis of the VSG grid-connected small-signal model, the system parameters and control parameters are designed to improve system stability margin. The causes of the unbalanced current are shown in a way of quantitative analysis. In addition, by improving the current command calculation method in the dq coordinate system, it is able to suppress the negative sequence current and ensure the power quality of the electro-hydrogen multi-complementary microgrid. Finally, the energy management strategy of multi-energy complementary microgrid is verified to be effective by simulation. The simulation results show that the VSG balanced current control method can achieve the three-phase balance of the grid-connected current in the case of voltage imbalance and the inrush current is suppressed from 52 A to 27 A. Furthermore, it significantly reduces power fluctuations.
- multi-energy complementary /
- virtual synchronous generator /
- unbalanced voltage /
- virtual impedance

HTML全文

图 1 电-氢多能互补型微电网结构

Figure 1. Electro-hydrogen multi-energy complementary microgrid structure

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图 2 VSG控制系统框图

Figure 2. Block diagram of VSG control system

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图 3 有功-相角、无功-电压传递函数波特图

Figure 3. Bode plot for active power-phase and reactive power-voltage transfer functions

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图 4 VSG控制系统闭环控制框图

Figure 4. Block diagram of VSG control system in closed-loop control

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图 5 有功控制环波特图

Figure 5. Bode diagram of active control loop

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图 6 无功控制环波特图

Figure 6. Bode diagram of reactive control loop

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图 7 改进的平衡电流控制框图

Figure 7. Block diagram of improved balanced current control

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图 8 多能互补型微电网功率协调控制

Figure 8. Coordinated control of multi-energy complementary microgrid power

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图 9 传统VSG控制输出电流波形

Figure 9. Output current waveform by traditional VSG control

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图 10 改进VSG电平衡控制输出电流

Figure 10. Output current by VSG current balanced control

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图 11 输出有功、无功功率对比

Figure 11. Comparison of active and reactive powers

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表 1 电源及储能参数

Table 1. Parameters of power supply and energy storage

名称	参数	数值
光伏阵列	环境温度/℃	25
光伏阵列	光照强度/（kW•m²）	1 000
燃料电池	额定功率/kW	1
燃料电池	额定电压/V	24
电解槽	额定功率/kW	1
储氢罐	最大容许压强/MPa	35
	体积/L	0.4
	初始容量/%	40
蓄电池	最大充放电功率/kW	2
	容量/（A•h）	20
	额定电压/V	350
	初始荷电状态/%	20
	额定功率/kW	12
	额定电压/V	37.5

下载: 导出CSV

表 2 系统参数

Table 2. Parameters of the system

参数	取值
U_DC/V	700
R/Ω	0.1
L/mH	6
C/μF	40
L_g/mH	2
D	15
J	0.05
K_V	300
k	5

下载: 导出CSV

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