电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
14期
55-62
,共8页
齐尚敏%李凤婷%何世恩%刘光途%黄蓉
齊尚敏%李鳳婷%何世恩%劉光途%黃蓉
제상민%리봉정%하세은%류광도%황용
集群风电场%低电压穿越%故障特性
集群風電場%低電壓穿越%故障特性
집군풍전장%저전압천월%고장특성
grid-connected large scale wind farms%low voltage ride through%fault characteristics
结合风电机组的结构和并网原理,对直驱风电机组提出了"卸荷电路+无功补偿"的低电压穿越改进控制方法,对双馈风电机组采用了DC-Chopper和SDBR(series dynamic braking resistor)代替Crowbar的低电压穿越改进控制方法.以 PSCAD 为平台分别构建了具备低电压穿越能力的直驱风电机组和双馈风电机组的并网仿真模型;结合风电并网技术规程,采用电压跌落器仿真验证了直驱、双馈风电机组在电网电压跌落下的低电压穿越能力.参照新疆达坂城实际风电场群接入系统方案,构建了包含具备低电压穿越能力的直驱、双馈风电机组的集群风电场仿真算例,研究了风电场送出线故障、集群风电场送出线电压跌落、系统线路电压跌落时风电场群故障穿越特性.仿真结果表明:集群接入风电场送出线电压跌落会影响相邻风电场及系统的电压和频率,故障结束后整个风电接入系统可以在风电接入技术规程要求的时间内恢复至稳态运行状态.研究成果有助于分析风电大规模集群接入系统的运行特性,提高电力系统对风电的接纳能力.
結閤風電機組的結構和併網原理,對直驅風電機組提齣瞭"卸荷電路+無功補償"的低電壓穿越改進控製方法,對雙饋風電機組採用瞭DC-Chopper和SDBR(series dynamic braking resistor)代替Crowbar的低電壓穿越改進控製方法.以 PSCAD 為平檯分彆構建瞭具備低電壓穿越能力的直驅風電機組和雙饋風電機組的併網倣真模型;結閤風電併網技術規程,採用電壓跌落器倣真驗證瞭直驅、雙饋風電機組在電網電壓跌落下的低電壓穿越能力.參照新疆達坂城實際風電場群接入繫統方案,構建瞭包含具備低電壓穿越能力的直驅、雙饋風電機組的集群風電場倣真算例,研究瞭風電場送齣線故障、集群風電場送齣線電壓跌落、繫統線路電壓跌落時風電場群故障穿越特性.倣真結果錶明:集群接入風電場送齣線電壓跌落會影響相鄰風電場及繫統的電壓和頻率,故障結束後整箇風電接入繫統可以在風電接入技術規程要求的時間內恢複至穩態運行狀態.研究成果有助于分析風電大規模集群接入繫統的運行特性,提高電力繫統對風電的接納能力.
결합풍전궤조적결구화병망원리,대직구풍전궤조제출료"사하전로+무공보상"적저전압천월개진공제방법,대쌍궤풍전궤조채용료DC-Chopper화SDBR(series dynamic braking resistor)대체Crowbar적저전압천월개진공제방법.이 PSCAD 위평태분별구건료구비저전압천월능력적직구풍전궤조화쌍궤풍전궤조적병망방진모형;결합풍전병망기술규정,채용전압질락기방진험증료직구、쌍궤풍전궤조재전망전압질락하적저전압천월능력.삼조신강체판성실제풍전장군접입계통방안,구건료포함구비저전압천월능력적직구、쌍궤풍전궤조적집군풍전장방진산례,연구료풍전장송출선고장、집군풍전장송출선전압질락、계통선로전압질락시풍전장군고장천월특성.방진결과표명:집군접입풍전장송출선전압질락회영향상린풍전장급계통적전압화빈솔,고장결속후정개풍전접입계통가이재풍전접입기술규정요구적시간내회복지은태운행상태.연구성과유조우분석풍전대규모집군접입계통적운행특성,제고전력계통대풍전적접납능력.
Based on the structure of wind turbines and its grid-connection principle, an improvedlow voltage ride through control scheme with "DC chopper + reactive compensation" of PMSG is proposed. An improvedlow voltage ride through control scheme with DC chopper and series dynamic braking resistor of DFIG is adopted. The grid-connection simulation models of PMSG and DFIG which have thecapability of low voltage ride through are built in the PSCAD/EMTDC. Based on " Technical rule for connecting wind farm to power system", the low voltage ride through capability are verified with voltage sag generator (VSG) for PMSG and DFIG. Combined with the accessing scheme of Dabancheng wind farm group, a simulation example of wind farm groups which all the PMSG and DFIG have the capability of low voltage ride through is built, the characteristics of wind farm groups during fault ride-through in condition of different fault types of tie line and voltage drop at wind farm outgoing line as well as voltage drop at tie line between the groups are researched. Results indicate that the voltage drop of grid-connected large scale wind farms outgoing line have influence on voltage and frequency for the adjacent wind farm and power system, the whole wind power system can be restored to steady state operationafter the failure.Research results contribute to analyze the running characteristic of grid-connected large scale wind farms and improve the receptivity ability for wind power.