为了满足配电网不对称短路计算的通用性要求,针对换流器型分布式电源(inverter based distributed generation,IBDG)不对称短路特征的多样性,研究含IBDG配电网的不对称短路电流计算方法。该方法从通用计算模型出发,根据IBDG不对称短路...为了满足配电网不对称短路计算的通用性要求,针对换流器型分布式电源(inverter based distributed generation,IBDG)不对称短路特征的多样性,研究含IBDG配电网的不对称短路电流计算方法。该方法从通用计算模型出发,根据IBDG不对称短路的正负序电流控制原理及在不同控制目标下的短路电流输出特性,结合低电压穿越和限流控制对IBDG输出不对称短路电流的具体要求,建立一种通用的、适用于多种控制目标的IBDG不对称短路正负序等效模型。基于该模型建立含IBDG配电网通用的不对称短路等效电路和计算方程,得到一种适用于多种IBDG控制目标的、配电网任意节点发生任意不对称短路的短路电流通用计算流程。最后,在一个配电网算例中对所提计算方法进行验证,结果表明了所提方法的正确性和有效性。展开更多
针对换流器型分布式电源(inverter based distributed generation,IBDG)广泛应用的新型配电网,解决目前不对称短路电流计算方法主要以计算单个短路点为主,且新增短路点后将面临计算通用性问题,该文研究一种新颖的配电网不对称短路电流...针对换流器型分布式电源(inverter based distributed generation,IBDG)广泛应用的新型配电网,解决目前不对称短路电流计算方法主要以计算单个短路点为主,且新增短路点后将面临计算通用性问题,该文研究一种新颖的配电网不对称短路电流计算方法。该方法将2个短路点的情况考虑在内,进一步对不对称短路进行分类,并形成结合IBDG短路等效电路的配电网不对称短路通用等效电路。接着分别建立1个和2个短路点情况下的计算方程和边界方程,提出一种能计及2个不对称短路点的,对配电网普遍适用的不对称短路电流通用计算方法。最后,在一个配电网算例中对所提计算方法进行验证,结果验证了所提方法的正确性和有效性。展开更多
An input-output signal selection based on Phillips-Heffron model of a parallel high voltage alternative current/high voltage direct current(HVAC/HVDC) power system is presented to study power system stability. It is w...An input-output signal selection based on Phillips-Heffron model of a parallel high voltage alternative current/high voltage direct current(HVAC/HVDC) power system is presented to study power system stability. It is well known that appropriate coupling of inputs-outputs signals in the multivariable HVDC-HVAC system can improve the performance of designed supplemetary controller. In this work, different analysis techniques are used to measure controllability and observability of electromechanical oscillation mode. Also inputs–outputs interactions are considered and suggestions are drawn to select the best signal pair through the system inputs-outputs. In addition, a supplementary online adaptive controller for nonlinear HVDC to damp low frequency oscillations in a weakly connected system is proposed. The results obtained using MATLAB software show that the best output-input for damping controller design is rotor speed deviation as out put and phase angle of rectifier as in put. Also response of system equipped with adaptive damping controller based on HVDC system has appropriate performance when it is faced with faults and disturbance.展开更多
文摘为了满足配电网不对称短路计算的通用性要求,针对换流器型分布式电源(inverter based distributed generation,IBDG)不对称短路特征的多样性,研究含IBDG配电网的不对称短路电流计算方法。该方法从通用计算模型出发,根据IBDG不对称短路的正负序电流控制原理及在不同控制目标下的短路电流输出特性,结合低电压穿越和限流控制对IBDG输出不对称短路电流的具体要求,建立一种通用的、适用于多种控制目标的IBDG不对称短路正负序等效模型。基于该模型建立含IBDG配电网通用的不对称短路等效电路和计算方程,得到一种适用于多种IBDG控制目标的、配电网任意节点发生任意不对称短路的短路电流通用计算流程。最后,在一个配电网算例中对所提计算方法进行验证,结果表明了所提方法的正确性和有效性。
文摘针对换流器型分布式电源(inverter based distributed generation,IBDG)广泛应用的新型配电网,解决目前不对称短路电流计算方法主要以计算单个短路点为主,且新增短路点后将面临计算通用性问题,该文研究一种新颖的配电网不对称短路电流计算方法。该方法将2个短路点的情况考虑在内,进一步对不对称短路进行分类,并形成结合IBDG短路等效电路的配电网不对称短路通用等效电路。接着分别建立1个和2个短路点情况下的计算方程和边界方程,提出一种能计及2个不对称短路点的,对配电网普遍适用的不对称短路电流通用计算方法。最后,在一个配电网算例中对所提计算方法进行验证,结果验证了所提方法的正确性和有效性。
文摘An input-output signal selection based on Phillips-Heffron model of a parallel high voltage alternative current/high voltage direct current(HVAC/HVDC) power system is presented to study power system stability. It is well known that appropriate coupling of inputs-outputs signals in the multivariable HVDC-HVAC system can improve the performance of designed supplemetary controller. In this work, different analysis techniques are used to measure controllability and observability of electromechanical oscillation mode. Also inputs–outputs interactions are considered and suggestions are drawn to select the best signal pair through the system inputs-outputs. In addition, a supplementary online adaptive controller for nonlinear HVDC to damp low frequency oscillations in a weakly connected system is proposed. The results obtained using MATLAB software show that the best output-input for damping controller design is rotor speed deviation as out put and phase angle of rectifier as in put. Also response of system equipped with adaptive damping controller based on HVDC system has appropriate performance when it is faced with faults and disturbance.
