Guizhou Power Dispatching and Communication Bureau

Guiyang, China

Guizhou Power Dispatching and Communication Bureau

Guiyang, China
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Ge D.,Anshun Electrical Power Supply Company | Jiang H.,Guizhou Power Dispatching and Communication Bureau | Xu G.,China Southern Power Grid Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

Segregation measures in the joint commissioning of stability control system for large-scale interconnected power systems are essential to the safe operation and successful commissioning. The segregation measures and requirements for joint and individual substation commissioning are detailed. Based on the integrity principle of stability control strategy and logic, the concept of mutual extension among stability control devices under different dispatch jurisdictions is introduced, which, in practical projects, guarantees the complete test of the stability control system without any dead zone, while the universal integrity of stability control strategy and logic during the joint and individual substation commissioning is ensured.


Huang H.,State Grid Electric Power Research Institute of China | Chen J.,State Grid Electric Power Research Institute of China | Gao Z.,State Grid Electric Power Research Institute of China | Gao C.,Guizhou Power Dispatching and Communication Bureau | And 2 more authors.
APAP 2011 - Proceedings: 2011 International Conference on Advanced Power System Automation and Protection | Year: 2011

Reactive power and voltage control is the important technical means to improve the voltage quality and reduce the active loss of power grid. It is hard to regulate the voltage and reactive power of Guizhou power grid by manual operation. In this paper, adopting to the successful experiences in automatic voltage control (AVC) system of several power companies in Europe and China, a new decomposition and coordination method is presented for multivariable coordinated control between generators, shunt capacitors, shunt reactors and adjustable reactive loads. Firstly, the method utilizes the primal-dual interior point algorithm to solve an large-scale discrete and mixing optimal reactive power flow (ROPF) calculation, which gives an optimal voltage profile of the whole power grid; Then the method utilizes the extended coordinated secondary voltage control to optimize the regional reactive power distribution with discrete and mixing variables coordination based on the local balance of reactive power, whilst satisfying the optimal voltage profile. The substation of district power network is equivalent to the adjustable reactive loads with coordination between provincial and district AVC systems. The paper also presents a new method of main and auxiliary dual instructions, which is used to control the plant voltage by master station. The newly developed AVC system has been put into practical operation in Guizhou power grid, and the results show that the AVC system is remarkably effective. © 2011 IEEE.


Shan Y.,Wuhan University | Shan Y.,Wuhan Naval University of Engineering | Shan Y.,State Grid Electric Power Research Institute of China | Gong Q.,Wuhan University | And 3 more authors.
APAP 2011 - Proceedings: 2011 International Conference on Advanced Power System Automation and Protection | Year: 2011

Reactive power and voltage control is the important technical means to improve the voltage quality and reduce the active loss of power grid. It is hard to regulate the voltage and reactive power of Guizhou power grid by manual operation. In this paper, adopting to the successful experiences in automatic voltage control (AVC) system of several power companies in Europe and China, a new decomposition and coordination method is presented for multivariable coordinated control between generators, shunt capacitors, shunt reactors and adjustable reactive loads. Firstly, the method utilizes the primal-dual interior point algorithm to solve an large-scale discrete and mixing optimal reactive power flow (ROPF) calculation, which gives an optimal voltage profile of the whole power grid; Then the method utilizes the extended coordinated secondary voltage control to optimize the regional reactive power distribution with discrete and mixing variables coordination based on the local balance of reactive power, whilst satisfying the optimal voltage profile. The substation of district power network is equivalent to the adjustable reactive loads with coordination between provincial and district AVC systems. The paper also presents a new method of main and auxiliary dual instructions, which is used to control the plant voltage by master station. The newly developed AVC system has been put into practical operation in Guizhou power grid, and the results show that the AVC system is remarkably effective. © 2011 IEEE.


Wang S.,State Grid Electric Power Research Institute of China | Zeng T.-J.,State Grid Electric Power Research Institute of China | Zheng M.-R.,Guizhou Power Dispatching and Communication Bureau
Dianwang Jishu/Power System Technology | Year: 2010

When arbitrary two-point ground fault occurred in different phases of neutral non-effective grounding system, there is a trouble that existing protection configuration scheme will cut off both grounded lines simultaneously or one of the grounded lines cannot be cut off selectively as desired. For this reason, the factors influencing selective tripping decision are analyzed and the formula to compute selection index of tripping, which takes the weight and value of the factors influencing tripping selection decision into account comprehensively, is given, and then the selective tripping decision scheme is proposed. The correctness of the proposed scheme is verified by cases and it is proved that adopting selective tripping for two-point grounding fault occurred in different phases can improve the power supply reliability of neutral non-effective grounding system.


Zhao W.,Guizhou Power Dispatching and Communication Bureau | Gao C.,Guizhou Power Dispatching and Communication Bureau | Lin H.,Guizhou Power Dispatching and Communication Bureau
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

It is difficult to detect N600 one-point or two (multi)-point grounding of PT(Potential Transformer) secondary circuit in running substations and power plants. A method is presented for it without power supply interruption. Equivalent circuits of N600 one-point grounding and two (multi)-point grounding of PT secondary circuit in running substations and power plants are established respectively. Based on the difference analysis between them, it is suggested to add a small resistance in series with N600 permanent grounding line of the PT secondary circuit, and the current through the permanent grounding line can be measure. When changing the resistance value, if the current is invariable, it is one -point grounding, otherwise, it is two (multi)-point grounding. Practices prove the availability of the method.

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