中国电机工程学报
中國電機工程學報
중국전궤공정학보
Proceedings of the CSEE
2015年
19期
4895-4905,后插27
,共12页
特高压直流%逆变站%功率特性%振荡中心%振荡阻尼
特高壓直流%逆變站%功率特性%振盪中心%振盪阻尼
특고압직류%역변참%공솔특성%진탕중심%진탕조니
ultra high voltage direct current (UHVDC)%inverter station%power characteristic%oscillation center%oscillation damping
我国地域辽阔,一次能源与负荷中心呈逆向分布特征.特高压直流跨区送电,并经特高压交流接续送电,是实现电力大容量、远距离、经济高效输送的重要方式,将成为交直流混联电网的典型格局之一.大扰动冲击下,与振荡中心近电气距离的大容量直流逆变站,其功率动态变化,会对系统振荡阻尼特性产生影响.该文研究了交流电压大幅波动条件下,直流逆变站非线性无功特性;从并联无功补偿支路提供振荡正阻尼条件和振荡等面积原理两个方面,揭示了直流逆变站弱化振荡阻尼的机制;基于低压限流单元(voltage dependent current order limiter,VDCOL)限流特性曲线对逆变站无功特性的影响分析,提出改善混联系统振荡阻尼的优化措施.准东—重庆±1100kV/10000MW特高压交直流混联电网大扰动时域仿真结果,验证了措施对抑制混联电网低频振荡的有效性.
我國地域遼闊,一次能源與負荷中心呈逆嚮分佈特徵.特高壓直流跨區送電,併經特高壓交流接續送電,是實現電力大容量、遠距離、經濟高效輸送的重要方式,將成為交直流混聯電網的典型格跼之一.大擾動遲擊下,與振盪中心近電氣距離的大容量直流逆變站,其功率動態變化,會對繫統振盪阻尼特性產生影響.該文研究瞭交流電壓大幅波動條件下,直流逆變站非線性無功特性;從併聯無功補償支路提供振盪正阻尼條件和振盪等麵積原理兩箇方麵,揭示瞭直流逆變站弱化振盪阻尼的機製;基于低壓限流單元(voltage dependent current order limiter,VDCOL)限流特性麯線對逆變站無功特性的影響分析,提齣改善混聯繫統振盪阻尼的優化措施.準東—重慶±1100kV/10000MW特高壓交直流混聯電網大擾動時域倣真結果,驗證瞭措施對抑製混聯電網低頻振盪的有效性.
아국지역료활,일차능원여부하중심정역향분포특정.특고압직류과구송전,병경특고압교류접속송전,시실현전력대용량、원거리、경제고효수송적중요방식,장성위교직류혼련전망적전형격국지일.대우동충격하,여진탕중심근전기거리적대용량직류역변참,기공솔동태변화,회대계통진탕조니특성산생영향.해문연구료교류전압대폭파동조건하,직류역변참비선성무공특성;종병련무공보상지로제공진탕정조니조건화진탕등면적원리량개방면,게시료직류역변참약화진탕조니적궤제;기우저압한류단원(voltage dependent current order limiter,VDCOL)한류특성곡선대역변참무공특성적영향분석,제출개선혼련계통진탕조니적우화조시.준동—중경±1100kV/10000MW특고압교직류혼련전망대우동시역방진결과,험증료조시대억제혼련전망저빈진탕적유효성.
With a vast territory, China's primary energy and load centers are reversely distributed. The ultra high voltage direct current (UHVDC) combined with ultra high voltage alternating current (UHVAC) is an important way to achieve large capacity, long-range and cost-effective power delivery and will be one of the typical pattern of AC and DC hybrid systems. Under large disturbance, the active and reactive power of the inverter station which is located at the UHVAC channel and close to the oscillation center will change dynamically with AC voltage fluctuations and will affect the oscillation damping characteristic. In this paper, the power characteristic of inverter station was investigated firstly. It is reveals that the dynamic reactive load characteristics and positive feedback mechanism between reactive power and voltage is the key factor in the weakening of oscillation damping. By analysis of influencing factors, the optimized parameters of the voltage dependent current order limiter (VDCOL) were proposed to improve the power characteristic of the inverter station and to enhance the oscillation damping of the hybrid system. Large disturbance time domain simulation results from the UHVDC/UHVAC hybrid system demonstrate the effectiveness of proposed measures to suppress low-frequency oscillations.
