计及电压幅值检测延时及相位跳变的IIDG故障电流解析计算

doi:10.11930/j.issn.1004-9649.202212094

摘要/Abstract

摘要：

逆变型分布式电源（inverter interfaced distributed generation，IIDG）的波动性、弱馈性及强受控性，使其在故障下具有与同步发电机不同的短路电流特性，对其进行准确解析是继电保护适应性分析与保护新原理研究的基础，具有重要意义。针对现有研究忽略电压幅值检测延时导致IIDG故障特性难以准确解析的问题，以新能源送出线路发生三相短路为例，综合考虑电压幅值检测延时以及相位跳变所引起锁相环动态响应特性的影响，对IIDG故障暂态过程进行精细化划分，分别针对故障暂态过程的2个阶段，建立了电压电流双环控制和电流环控制下的故障电流解析表达式，明确了电压检测延时与锁相环动态响应对IIDG故障电流暂态特性的影响机理。最后，基于Matlab/Simulink仿真平台，验证了所提故障电流解析计算模型的正确性。

关键词: 逆变型分布式电源, 电流解析计算, 幅值检测延时, 相位跳变, 对称故障

Abstract:

The volatility, weak feedback, and strong control of inverter interfaced distributed generation (IIDG) make it have different short-circuit current characteristics from synchronous generators under faults, and accurate analysis of them is the basis for the analysis of relay protection adaptability and the research of new protection principles, which is of great significance. Since the existing literature ignores the voltage amplitude detection delay and makes it difficult to accurately analyze the fault characteristics of IIDG, this paper takes the three-phase short circuit of the new energy transmission line as an example, comprehensively considers the influence of the voltage amplitude detection delay and the dynamic response characteristics of the phase-locked loop caused by phase jump, and finely divides the transient process of IIDG fault. It also establishes the fault current analysis expression under voltage and current loop control and current loop control for the two stages of the transient process of the fault. The influence mechanism of voltage detection delay and dynamic response of phase-locked loop on the transient characteristics of IIDG fault current is clarified. Finally, based on the Matlab/Simulink simulation platform, the correctness of the fault current analysis and calculation model proposed in this paper is verified.

Key words: inverter interfaced distributed generation, current analysis and calculation, amplitude detection delay, phase jump, symmetric fault

罗美玲, 马英, 黄伟兵, 孟令昆, 于晓军, 郑涛. 计及电压幅值检测延时及相位跳变的IIDG故障电流解析计算[J]. 中国电力, 2024, 57(2): 72-81.

Meiling LUO, Ying MA, Weibing HUANG, Lingkun MENG, Xiaojun YU, Tao ZHENG. IIDG Fault Current Analysis and Calculation Considering Voltage Amplitude Detection Delay and Phase Jump[J]. Electric Power, 2024, 57(2): 72-81.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202212094

https://www.electricpower.com.cn/CN/Y2024/V57/I2/72

图/表 14

图 1 IIDG并网系统拓扑结构及控制框图

Fig.1 IIDG grid-connected system topology and control block diagram

图 2 锁相环控制结构

Fig.2 Structure of phase-locked loop control

图 3 并网点电压跌落示意

Fig.3 Voltage drop at grid-connected point

图 4 锁相环输出相位变化示意

Fig.4 Phase change of phase-locked loop output

图 5 锁相环影响路径

Fig.5 Path affected by phase-locked loop

图 6 故障电流解析思路

Fig.6 Fault current analysis

图 7 IIDG并网结构

Fig.7 IIDG grid-connected structure

表 1 IIDG并网仿真模型参数

Table 1 IIDG grid-connected simulation model parameters

参数	数值	参数	数值
额定容量/(MV·A)	0.25	变压器T1变比	0.38/35
电压环控制参数$ {K}_{\mathrm{v}\mathrm{p}} $	2	变压器T2变比	35/110
电压环控制参数$ {K}_{\mathrm{v}\mathrm{i}} $	400	滤波电感/mH	20
电流环控制参数$ {K}_{\mathrm{i}\mathrm{p}} $	0.3	滤波电阻/mΩ	0.37
电流环控制参数$ {K}_{\mathrm{i}\mathrm{i}} $	20	直流母线电容/μF	8000
锁相环控制参数K_p	180	锁相环控制参数K_i	3200

图 8 并网点电压跌落波形（跌至0.8 p.u.）

Fig.8 Voltage drop waveform at grid-connected point (dropped to 0.8 p.u.)

图 9 dq轴电流理论与仿真对比（并网点电压跌至0.8 p.u.）

Fig.9 Comparison between current of dq axis theory and simulation (voltage of grid-connected point dropped to 0.8 p.u.)

图 10 A相电流理论与仿真对比（并网点电压跌至0.8 p.u.）

Fig.10 Comparison between A phase theory and simulation current (voltage of grid-connected point dropped to 0.8 p.u.)

图 11 并网点电压跌落波形（跌至0.45 p.u.）

Fig.11 Voltage drop waveform at grid-connected point (dropped to 0.45 p.u.)

图 12 dq轴电流理论与仿真对比（并网点电压跌至0.45 p.u.）

Fig.12 Comparison between current of dq axis theory and simulation (voltage of grid-connected point dropped to 0.45 p.u.)

图 13 A相电流理论与仿真对比（并网点电压跌至0.45 p.u.）

Fig.13 Comparison between A phase theory and simulation current (voltage of grid-connected point dropped to 0.45 p.u.)

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