| 引用本文: | 王洁聪,郭琦,刘崇茹,Udaya Annakkage,黎晓,苏晨博,罗超.MMC的稳态相量模型及功率运行区间计算方法[J].电力自动化设备,2021,41(6): |
| WANG Jiecong,GUO Qi,LIU Chongru,Udaya Annakkage,LI Xiao,SU Chenbo,LUO Chao.Steady-state phasor model and power operating region calculation method of MMC[J].Electric Power Automation Equipment,2021,41(6): |
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| MMC的稳态相量模型及功率运行区间计算方法 |
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王洁聪1, 郭琦2,3,4, 刘崇茹1, Udaya Annakkage5, 黎晓1, 苏晨博1, 罗超2,4,6
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1.华北电力大学 新能源电力系统国家重点实验室，北京 102206;2.南方电网科学研究院有限责任公司 直流输电技术国家重点实验室，广东 广州 510663;3.国家能源大电网技术研发(实验)中心，广东 广州 510663;4.广东省新能源电力系统智能运行与控制企业重点实验室，广东 广州 510663;5.曼尼托巴大学，加拿大 温尼伯 R3T2N2;6.中国南方电网公司电网仿真重点实验室，广东 广州 510663
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| 摘要: |
| 模块化多电平换流器(MMC)的控制器输出量与MMC内部电气量之间存在复杂的耦合关系，难以确定影响其输出功率范围的关键因素及计算功率运行区间的边界。为此，首先以dq坐标相量的形式，推导出一种新的MMC的交流侧稳态等效模型，该模型为1个等效电容与等效电压源串联。模型参数可完全由控制器输出量和直流电压确定，从而将控制输出量与运行电气量解耦；等效电容直观地反映了MMC子模块电容充放电过程造成的换流器内部耦合特性对交流侧输出特性的影响。利用所提模型可以方便地计算得到MMC输出功率的P-Q曲线。然后，通过计算P-Q曲线族的包络线，提出一种确定MMC稳态运行区域边界的方法，并研究了环流抑制控制和交流系统短路比对运行区域的影响。最后，在PSCAD/EMTDC平台上搭建单端MMC仿真模型，验证了所提模型及稳态运行区间计算方法的正确性。 |
| 关键词: 模块化多电平换流器 稳态相量模型 功率运行区间 耦合特性 包络线 |
| DOI：10.16081/j.epae.202105021 |
| 分类号:TM46 |
| 基金项目:直流输电技术国家重点实验室开放基金资助项目(SKLHVDC-2019-KF-13) |
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| Steady-state phasor model and power operating region calculation method of MMC |
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WANG Jiecong1, GUO Qi2,3,4, LIU Chongru1, Udaya Annakkage5, LI Xiao1, SU Chenbo1, LUO Chao2,4,6
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1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China;3.National Energy Power Grid Technology R&D Centre, Guangzhou 510663, China;4.Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System, Guangzhou 510663, China;5.University of Manitoba, Winnipeg R3T2N2, Canada;6.CSG Key Laboratory for Power System Simulation, Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China
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| Abstract: |
| There is a complex coupling relationship between the controller outputs and the internal electrical quantities of MMC(Modular Multilevel Converter),and it is difficult to determine the key constraints limiting the power outputs and calculate the power operating region of MMC. Thus, a novel AC-side steady-state equivalent model of MMC in the form of phasor in dq frame coordinate system is proposed, the model is an equivalent capacitance in series with an equivalent voltage source. All parameters of the model are determined only by the controller output and DC voltage, so that the controller outputs and operating electrical quantities are decoupled. The equivalent capacitance intuitively reflects the influence of the converter internal coupling characteristics caused by the submodule capacitor charging and discharging process on AC-side output characteristics. Based on the proposed model, the P-Q curve of output power for MMC can be calculated conveniently. Then, an approach to determine the power operating region of MMC by calculating the envelope of P-Q curve family is proposed, and the impacts of circulating current suppression control and SCR(Short Circuit Ratio) of AC system on the operating region are studied. Finally, the correctness of the proposed model and the steady-state operating region calculation method are verified by single-terminal MMC simulation model built on PSCAD/EMTDC platform. |
| Key words: modular multilevel converter steady-state phasor model power operating region coupling characteristics envelope |
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