scholarly journals Research on optimization method of primary frequency modulation capability based on different ratios of hydropower

2020 ◽  
Vol 185 ◽  
pp. 01031
Author(s):  
Xiaojie Pan ◽  
Maosen Fan ◽  
Wenchao Zhang ◽  
Liwei Zhang ◽  
Xing Chen
Keyword(s):  
Transmission Lines ◽  
Frequency Modulation ◽  
Power Grid ◽  
Thermal Power ◽  
Optimization Method ◽  
Frequency Stability ◽  
High Ratio ◽  
Long Distance ◽  
Primary Frequency ◽  
Grid Operation

With the continuous development of China’s cross-regional interconnected power grid, large- capacity and long-distance transmission have become an important feature of China’s power grid. As the transmission capacity of single-return transmission lines continues to increase, the risk of frequency fluctuations increases, making grid operation scheduling more concerned with the performance of the unit’s primary frequency modulation. This paper tests the frequency stability of a power system under different scenarios, in which the proportion of water and thermal power in the system is different. The results represent that a system with a large proportion of hydropower has poorer frequency stability. This paper offers a method of primary frequency modulation, which proposed to improve the frequency stability of the system by increasing the time delay of the hydropower unit’s governor. The results of simulation prove that this method is an available solution to solve the problem of poor system frequency stability when a system has a high ratio of hydropower.

Research on the Primary Frequency Regulation of the Large Capacity Thermal Power Units

2014 ◽  
Vol 608-609 ◽  
pp. 915-919 ◽  
Author(s):  
Hong Xia Wu
Keyword(s):  
Power Plant ◽  
Control Method ◽  
Power Grid ◽  
Thermal Power ◽  
Frequency Regulation ◽  
Load Curve ◽  
Large Capacity ◽  
Continuous Increase ◽  
Important Index ◽  
Primary Frequency

Frequency is an important index of power quality, primary frequency regulation is of great significance for maintaining the grid frequency. In recent years, with the expansion of the power grid capacity and the continuous increase of the generator capacity, the large capacity units play a role is becoming more and more important in the primary frequency regulation of power grid. This paper takes ultra supercritical coal-fired units (1000MW) of a power plant of Hubei for example, primary frequency regulation control method, requency offset load curve and so on were studied through relevant test.

Research and Optimization of Thermal Power Unit's Automatic Control Based on Frequency Regulation Ability of Power Grid

2013 ◽  
Vol 330 ◽  
pp. 606-610 ◽  
Author(s):  
Jun Li ◽  
Wei Wei Li
Keyword(s):  
Power Systems ◽  
Automatic Control ◽  
Power Grid ◽  
Thermal Power ◽  
Optimal Operation ◽  
Theory And Practice ◽  
Frequency Regulation ◽  
Frequency Compensation ◽  
The Stability ◽  
Primary Frequency

Wind power and other new energy connected to power grid bring new challenges to optimal operation of power systems. The stability of power grid mainly depends on primary frequency compensation and secondary frequency compensation of thermal power units. By analyzing the theory and practice of DEH and coordinated control system (CCS) of thermal power units, combined with the insufficient of actual primary frequency compensation and automatic power generation control (AGC) strategy response to frequency of accidents, the optimization of primary frequency compensation and AGC of thermal power units automatic control were offered. The practical application results show that the proposed control strategy can effectively control the thermal power units to achieve the stability of power grid frequency.

scholarly journals Adaptive Droop Coefficient and SOC Equalization-Based Primary Frequency Modulation Control Strategy of Energy Storage

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2645
Author(s):  
Gaojun Meng ◽  
Yang Lu ◽  
Haitao Liu ◽  
Yuan Ye ◽  
Yukun Sun ◽  
...  
Keyword(s):  
Energy Storage ◽  
Frequency Modulation ◽  
Control Strategy ◽  
Simulation Analysis ◽  
Power Grid ◽  
Frequency Regulation ◽  
Storage Battery ◽  
Load Disturbance ◽  
Modulation Control ◽  
Primary Frequency

In order to efficiently use energy storage resources while meeting the power grid primary frequency modulation requirements, an adaptive droop coefficient and SOC balance-based primary frequency modulation control strategy for energy storage is proposed. Taking the SOC of energy storage battery as the control quantity, the depth of energy storage output is adaptively adjusted to prevent the saturation or exhaustion of energy storage SOC. The balanced control strategy is introduced to realize the rational utilization of resources and the fast balance of SOC in the process of primary frequency modulation of energy storage battery under different charge states. Then, four evaluation indexes are proposed to evaluate the effect of primary frequency modulation and SOC maintenance. Taking a regional power grid as an example, a simulation analysis is carried out under step load disturbance and continuous load disturbance. According to the simulation results, the proposed control strategy is effective in power system frequency regulation and battery SOC maintenance.

scholarly journals Engineering Vehicles Detection Based on Modified Faster R-CNN for Power Grid Surveillance

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2258 ◽  
Author(s):  
Xuezhi Xiang ◽  
Ning Lv ◽  
Xinli Guo ◽  
Shuai Wang ◽  
Abdulmotaleb El Saddik
Keyword(s):  
Intrusion Detection ◽  
Transmission Lines ◽  
Power Grid ◽  
High Accuracy ◽  
Detection Task ◽  
Feature Classification ◽  
Intelligent Surveillance ◽  
Detection Model ◽  
Surveillance Method ◽  
Grid Operation

Engineering vehicles intrusion detection is a key problem for the security of power grid operation, which can warn of the regional invasion and prevent external damage from architectural construction. In this paper, we propose an intelligent surveillance method based on the framework of Faster R-CNN for locating and identifying the invading engineering vehicles. In our detection task, the type of the objects is varied and the monitoring scene is large and complex. In order to solve these challenging problems, we modify the network structure of the object detection model by adjusting the position of the ROI pooling layer. The convolutional layer is added to the feature classification part to improve the accuracy of the detection model. We verify that increasing the depth of the feature classification part is effective for detecting engineering vehicles in realistic transmission lines corridors. We also collect plenty of scene images taken from the monitor site and label the objects to create a fine-tuned dataset. We train the modified deep detection model based on the technology of transfer learning and conduct training and test on the newly labeled dataset. Experimental results show that the proposed intelligent surveillance method can detect engineering vehicles with high accuracy and a low false alarm rate, which can be used for the early warning of power grid surveillance.

Effects of GIC in Power System and Control Measures

2012 ◽  
Vol 182-183 ◽  
pp. 676-680
Author(s):  
You Jie Ma ◽  
Dong Fang Wu ◽  
Xue Song Zhou
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Large Scale ◽  
Geomagnetic Storms ◽  
Neutral Line ◽  
Power Grid ◽  
Electric Power System ◽  
Control Measures ◽  
Long Distance ◽  
The Earth

The geomagnetic storm which is caused by the sun's activity is a global natural disaster. For the transformer neutral line connects to the earth directly, the geomagnetic storms can induce GIC in the loop formed by the earth and the transmission lines with long distance. The GIC has very big effect on the safe operation of electric power system when it flows in power grid. It includes the main damages on power system equipment caused by the GIC, the introduction of the GIC generation principle, main features, analysis algorithm and some control measures in this paper. Finally, point out that the GIC of the long distance transmission system and large-scale power grid should be paid more attention.

The Analysis of Strategies for Large Thermal Power Unit Frequency Control after the Breakdown of Isolated Network in Sending-End Network

2013 ◽  
Vol 392 ◽  
pp. 646-650
Author(s):  
Hao Wang ◽  
Qing Wang ◽  
He Huang ◽  
Yong Zhang ◽  
Yun Ting Song ◽  
...  
Keyword(s):  
Power Unit ◽  
High Frequency ◽  
Frequency Control ◽  
Power Grid ◽  
Thermal Power ◽  
Load Shedding ◽  
High Rate ◽  
Optimization Strategy ◽  
Lower Amplitude ◽  
Primary Frequency

As for the hidden dangers of low-frequency load shedding caused by high frequency generator tripping in isolated power grid because of the failure connection between outward transmission district grid and leadership grid, we gave an analysis to problems with high-frequency in sending network and isolated power grid, and reasons causing the unmatching between OPC and governors. Then, we adopted the measured parameters of thermal power units for the analysis of its regulating system under the isolated power grid, and discussed the regulating effect when the lower amplitude of the primary frequency was-30% and full liberalization. As for the high rate of load shedding in the sending network, this paper has put forward an optimization strategy for thermal power unit frequency control in isolated network. Release primary frequency amplitude to-30% in isolated network, measure the acceleration of rotation speed when OPC acts at the first time, calculate the tragic power of the unit and send it to AGC system. The unit quickly adjusts the power of the unit according to new AGC instruction, and stabilizes the frequency in isolated network. This strategy can help to realize the coordination between OPC and speed governor, and improve the margin of high-frequency in isolated network.

Reconstruction Analysis on the Energy Conservation of the Power Grid in Anhui Area

2013 ◽  
Vol 373-375 ◽  
pp. 2219-2223
Author(s):  
Qing Sheng Sun ◽  
Qing Song Lei ◽  
Rui Ke ◽  
Ming Yu Li
Keyword(s):  
Energy Conservation ◽  
Energy Saving ◽  
Economic Efficiency ◽  
Transmission Lines ◽  
Energy Efficient ◽  
Power Loss ◽  
Power Grid ◽  
Distribution Features ◽  
Grid Operation ◽  
Looped Network

This paper presented the loss of the power grid and elaborated the distribution features of the power grid in Anhui, pointed out that measures should be taken to improve the structure of Anhui power grid for energy-saving according to its own specific characteristics. Suggestions includes the construction of UHV power grid, the breaking out of looped network, the construction of multi-circuit transmission lines on the same tower, scientific adjusting the grid operation voltage, improving the power factors, and adjusting the load. Based on the rules and characteristics of grid power loss, measures should be adopted on special ways to get the largest energy-efficient operations and achieve the aim of less investment to increase economic efficiency.

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