新能源大规模并网会给电力系统的动态安全稳定带来新影响,因此新能源的安全、稳定、高效利用是能源未来的发展方向之一。不同种类的新能源对电力系统的暂态稳定影响各不相同,采用“域”的分析法能够较好地解决这一问题。首先,提出了基...新能源大规模并网会给电力系统的动态安全稳定带来新影响,因此新能源的安全、稳定、高效利用是能源未来的发展方向之一。不同种类的新能源对电力系统的暂态稳定影响各不相同,采用“域”的分析法能够较好地解决这一问题。首先,提出了基于改进的动态差分进化-内点法(dynamic differential evolution-interior point method,DDE-IPM)进行动态安全域构建和分析,该方法与传统方法相比,具有速度快、误差小、准确率高等优点。其次,在DIgSILENT/PowerFactory进行时域仿真,对故障下不同种类新能源、不同渗透率下系统动态安全域进行校验,并分析系统在不同渗透率下的低电压穿越能力,得出以下结论:在系统各新能源渗透率下,系统的动态安全域超平面具有平行的性质且边界距离与新能源的容量增量成正比;新能源的补偿设备对系统的暂态安全性在一定范围内起到支撑作用,系统的动态安全域有所外扩;系统风电机组和光伏电站均满足并网运行的低电压穿越能力。展开更多
This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity c...This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity cost.The static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very easy.In the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is suggested.According to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are derived.The components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system security.An illustrative example on the New England 10-genetator 39-bus System is used to demonstrate the proposed method.展开更多
提出了一种快速识别初始运行点附近失稳模态的方法,该方法基于大量计算观察到的初始运行点附近不同运行点注入下模型的可达性格纳姆矩阵元素近乎不变的性质,将基于K-中心点算法的同调识别和初加速度法相结合,快速识别初始运行点附近的...提出了一种快速识别初始运行点附近失稳模态的方法,该方法基于大量计算观察到的初始运行点附近不同运行点注入下模型的可达性格纳姆矩阵元素近乎不变的性质,将基于K-中心点算法的同调识别和初加速度法相结合,快速识别初始运行点附近的失稳模态,为实用动态安全域(PDSR)直接法提供了临界点搜索建议,改善了PDSR法。该方法的有效性在New England 10机39节点系统得到了验证。展开更多
The paper presents a practical dynamic security region (PDSR) based dynamic security risk assessment and optimization model for power transmission system. The cost of comprehensive security control and the influence o...The paper presents a practical dynamic security region (PDSR) based dynamic security risk assessment and optimization model for power transmission system. The cost of comprehensive security control and the influence of uncertainties of power injections are considered in the model of dynamic security risk assessment. The transient stability constraints and uncertainties of power injections can be considered easily by PDSR in form of hyper-box. A method to define and classify contingency set is presented, and a risk control optimization model is given which takes total dynamic insecurity risk as the objective function for a dominant con-tingency set. An optimal solution of dynamic insecurity risk is obtained by opti-mizing preventive and emergency control cost and contingency set decomposition. The effectiveness of this model has been proved by test results on the New Eng-land 10-genarator 39-bus system.展开更多
电力系统中的相量测量单元(PMU)可以实现电网部分相量(如节点的电压相量)的实时异地同步测量与传输。为充分发挥含PMU的广域量测系统(W AM S/PMU)在电力系统安全预警、保护与控制中的作用,研究了节点相角-电压空间上保证暂态稳定的动态...电力系统中的相量测量单元(PMU)可以实现电网部分相量(如节点的电压相量)的实时异地同步测量与传输。为充分发挥含PMU的广域量测系统(W AM S/PMU)在电力系统安全预警、保护与控制中的作用,研究了节点相角-电压空间上保证暂态稳定的动态安全域的边界性质。研究表明,对于既定的事故和事故前、后系统图形,相角-电压空间上实用动态安全域的临界边界同样可以用一个或极少数几个超平面近似描述。节点相角-电压空间中的实用动态安全域边界的拟合具有非常好的精度。基于这样一个安全域和W AM S/PMU提供的节点信息,可以很方便地计算出相角-电压空间的任一增长方向上的稳定裕度。也可以通过可视化,在线观察目前运行点距既定预想事故下稳定边界各个方向上的距离。展开更多
文摘新能源大规模并网会给电力系统的动态安全稳定带来新影响,因此新能源的安全、稳定、高效利用是能源未来的发展方向之一。不同种类的新能源对电力系统的暂态稳定影响各不相同,采用“域”的分析法能够较好地解决这一问题。首先,提出了基于改进的动态差分进化-内点法(dynamic differential evolution-interior point method,DDE-IPM)进行动态安全域构建和分析,该方法与传统方法相比,具有速度快、误差小、准确率高等优点。其次,在DIgSILENT/PowerFactory进行时域仿真,对故障下不同种类新能源、不同渗透率下系统动态安全域进行校验,并分析系统在不同渗透率下的低电压穿越能力,得出以下结论:在系统各新能源渗透率下,系统的动态安全域超平面具有平行的性质且边界距离与新能源的容量增量成正比;新能源的补偿设备对系统的暂态安全性在一定范围内起到支撑作用,系统的动态安全域有所外扩;系统风电机组和光伏电站均满足并网运行的低电压穿越能力。
基金the key research project of the National Natural Science Foundation of China(Grant No.50595413)
文摘This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity cost.The static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very easy.In the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is suggested.According to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are derived.The components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system security.An illustrative example on the New England 10-genetator 39-bus System is used to demonstrate the proposed method.
文摘提出了一种快速识别初始运行点附近失稳模态的方法,该方法基于大量计算观察到的初始运行点附近不同运行点注入下模型的可达性格纳姆矩阵元素近乎不变的性质,将基于K-中心点算法的同调识别和初加速度法相结合,快速识别初始运行点附近的失稳模态,为实用动态安全域(PDSR)直接法提供了临界点搜索建议,改善了PDSR法。该方法的有效性在New England 10机39节点系统得到了验证。
基金Supported by the key research of the National Natural Science Foundation of China (Grant No. 50595413) The National Basic Research Program of China (973 Program) (Grant No. 2004CB217904)
文摘The paper presents a practical dynamic security region (PDSR) based dynamic security risk assessment and optimization model for power transmission system. The cost of comprehensive security control and the influence of uncertainties of power injections are considered in the model of dynamic security risk assessment. The transient stability constraints and uncertainties of power injections can be considered easily by PDSR in form of hyper-box. A method to define and classify contingency set is presented, and a risk control optimization model is given which takes total dynamic insecurity risk as the objective function for a dominant con-tingency set. An optimal solution of dynamic insecurity risk is obtained by opti-mizing preventive and emergency control cost and contingency set decomposition. The effectiveness of this model has been proved by test results on the New Eng-land 10-genarator 39-bus system.
文摘电力系统中的相量测量单元(PMU)可以实现电网部分相量(如节点的电压相量)的实时异地同步测量与传输。为充分发挥含PMU的广域量测系统(W AM S/PMU)在电力系统安全预警、保护与控制中的作用,研究了节点相角-电压空间上保证暂态稳定的动态安全域的边界性质。研究表明,对于既定的事故和事故前、后系统图形,相角-电压空间上实用动态安全域的临界边界同样可以用一个或极少数几个超平面近似描述。节点相角-电压空间中的实用动态安全域边界的拟合具有非常好的精度。基于这样一个安全域和W AM S/PMU提供的节点信息,可以很方便地计算出相角-电压空间的任一增长方向上的稳定裕度。也可以通过可视化,在线观察目前运行点距既定预想事故下稳定边界各个方向上的距离。
