近年来,高比例可再生能源发电接入我国电网,通过多条特高压/超高压交直流输电线路实现远距离传输,电网对故障后的暂态电压过程更加敏感,暂态电压安全成为我国电网的核心威胁之一。这已经成为国内外学术界和产业界关注的热点,其中一个焦...近年来,高比例可再生能源发电接入我国电网,通过多条特高压/超高压交直流输电线路实现远距离传输,电网对故障后的暂态电压过程更加敏感,暂态电压安全成为我国电网的核心威胁之一。这已经成为国内外学术界和产业界关注的热点,其中一个焦点是如何通过有效的控制手段降低出现暂态电压不安全的风险。该文设计并研发了面向高比例可再生能源交直流混联电网的动态自动电压控制(dynamic automatic voltage control,DAVC)系统,通过考虑在线预想故障集的预防控制,提升电网故障后的暂态电压支撑能力。阐述了所研制的DAVC系统总体结构、主要功能和系统设计,通过在实际大型电网的应用案例说明其效果。目前,该DAVC系统已经在我国多个网省级电网调度控制中心取得实际在线应用。展开更多
In this paper, digital simulation techniques for dynamic and transient voltage performance studies, using accurate load and synchronous generator models have been proposed. Particular attention has been paid to the in...In this paper, digital simulation techniques for dynamic and transient voltage performance studies, using accurate load and synchronous generator models have been proposed. Particular attention has been paid to the induction motor load model. Accurate models of voltage supporting devices including OLTC transformer are derived. The system of differential equations based on the above models are converted into linear algebraic equations by use of the trapezoidal approximation formula. These are then written as difference equations to facilitate computational programming. For various contingencies a numerical iterative technique is used to obtain a simulation of the system voltage and angle profile. Various contingency tests on a 9-bus sample system and a 22-bus system prove the applicability of the package.展开更多
By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) mal...By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) malfunction in a power system. By modeling the load characteristic with data from SCADA, we employed the Gauss-Seidel method to solve the nonlinear equations and estimate the voltage of unobservable buses with the high precision voltages of neighboring buses measured by a PMU. Simulations were carried out on the IEEE 39-bus system, and the results show that this novel method can dynamically and accurately trace the variation of the voltage phasor of the unobservable buses.展开更多
文摘近年来,高比例可再生能源发电接入我国电网,通过多条特高压/超高压交直流输电线路实现远距离传输,电网对故障后的暂态电压过程更加敏感,暂态电压安全成为我国电网的核心威胁之一。这已经成为国内外学术界和产业界关注的热点,其中一个焦点是如何通过有效的控制手段降低出现暂态电压不安全的风险。该文设计并研发了面向高比例可再生能源交直流混联电网的动态自动电压控制(dynamic automatic voltage control,DAVC)系统,通过考虑在线预想故障集的预防控制,提升电网故障后的暂态电压支撑能力。阐述了所研制的DAVC系统总体结构、主要功能和系统设计,通过在实际大型电网的应用案例说明其效果。目前,该DAVC系统已经在我国多个网省级电网调度控制中心取得实际在线应用。
文摘In this paper, digital simulation techniques for dynamic and transient voltage performance studies, using accurate load and synchronous generator models have been proposed. Particular attention has been paid to the induction motor load model. Accurate models of voltage supporting devices including OLTC transformer are derived. The system of differential equations based on the above models are converted into linear algebraic equations by use of the trapezoidal approximation formula. These are then written as difference equations to facilitate computational programming. For various contingencies a numerical iterative technique is used to obtain a simulation of the system voltage and angle profile. Various contingency tests on a 9-bus sample system and a 22-bus system prove the applicability of the package.
基金Project supported by the National Natural Science Foundation of China (Nos. 50507018, 50595414, 50677062, and 60421002)the National Basic Research Program (973) of China (No. 2004CB217902)+1 种基金the National Key Technologies Supporting Program of Chinaduring the 11th Five-Year Plan Period (No. 2006BAA02A01)theKey Grant Project of MOE of China (No. 305008)
文摘By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) malfunction in a power system. By modeling the load characteristic with data from SCADA, we employed the Gauss-Seidel method to solve the nonlinear equations and estimate the voltage of unobservable buses with the high precision voltages of neighboring buses measured by a PMU. Simulations were carried out on the IEEE 39-bus system, and the results show that this novel method can dynamically and accurately trace the variation of the voltage phasor of the unobservable buses.
