| 引用本文: | 苗 青,吴俊勇,艾洪克,熊 飞,齐大伟,郝亮亮.组合级联式兆瓦级功率调节装置协调控制策略[J].电力自动化设备,2014,34(7): |
| MIAO Qing,WU Junyong,AI Hongke,XIONG Fei,QI Dawei,HAO Liangliang.Coordinated control of hybrid cascaded megawatt power regulation device[J].Electric Power Automation Equipment,2014,34(7): |
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| 摘要: |
| 提出了一种新型组合级联式兆瓦级功率转换系统（PCS）的拓扑结构，它由电池组、隔离型半桥DC／DC变换器和级联式H桥DC／AC变换器组合而成。首先对所选用的隔离型半桥DC／DC变换器的基本原理、电压增益和功率传输特性进行了分析。在此基础上，重点研究了2种变换器的协调控制策略：为实现装置的双向功率交换，DC／DC侧采用移相控制，DC／AC侧采用双环控制；为确保直流侧电容电压恒定，DC／DC侧采用占空比控制，DC／AC侧采用全局直流电压控制；为提高装置响应速度和改善直流侧电容电压品质，将电网侧的实时功率指令前馈给DC／DC侧；为改善装置的启动特性，提出了一种软启动控制策略。在PSCAD／EMTDC环境下建立了基于锂电池储能的PCS模型，应用所提出的一整套协调控制策略，对装置的启动过程、正常调节工况、电池组容量和荷电状态不同等工况进行了仿真。结果表明该装置在所提出控制策略下具有较宽的电压匹配能力，电池状态适应能力强，且控制的响应速度较快，能实现大容量储能和双向大功率调节。 |
| 关键词: 功率转换系统 隔离型半桥DC ／DC变换器 级联式H桥DC ／AC变换器 储能 功率控制 前馈控制 |
| DOI： |
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| 基金项目:北京市科技计划课题资助项目（D131104002013003） |
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| Coordinated control of hybrid cascaded megawatt power regulation device |
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MIAO Qing, WU Junyong, AI Hongke, XIONG Fei, QI Dawei, HAO Liangliang
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School of Electrical Engineering，Beijing Jiaotong University，Beijing 100044，China
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| Abstract: |
| A topology of hybrid cascaded megawatt PCS（Power Conversion System） is proposed，which consists of battery packs，isolated half-bridge DC／DC converter and cascaded H-bridge DC／AC converter. The basic principle，voltage gain and power transmission characteristics of the selected isolated half-bridge DC／DC converter are analyzed，based on which，the coordinated control between two kinds of converter is emphatically studied. The phase-shift control at DC／DC side and the dual-loop control at DC／AC side are adopted to realize the bi-directional power exchange；the duty-cycle control at DC／DC side and the global DC voltage control at DC／AC side are adopted to maintain the DC capacitor voltage constant；the real-time power instruction of grid side is fed back to DC／DC side for increasing the response speed of device and improving the quality of DC capacitor voltage；and a scheme of soft startup control is applied to improve the startup characteristics of device. A PCS model based on lithium battery energy storage is established with PSCAD／EMTDC and its operation under the proposed coordinated control is simulated for different battery capacities and state of charge under startup and normal regulation conditions. Simulative results demonstrate that，the device under the proposed control has wide voltage matching capability，excellent battery status adaptability，fast response，large energy-storage capacity and bi-directional power regulation capability. |
| Key words: power conversion system isolated half-bridge DC／DC converter cascaded H-bridge DC／AC converter energy storage power control feedforward control |
