Emergency Control Strategy Study on Multi-Send HVDC Project from Central China to East China Power Grid

2013 ◽  
Vol 732-733 ◽  
pp. 1157-1163
Author(s):  
Jia Zhang ◽  
Xiao Fang Song ◽  
Feng Xue
Keyword(s):  
Control Strategy ◽  
Transient Stability ◽  
Power Grid ◽  
Peak Load ◽  
Coordinated Control ◽  
Central China ◽  
East China ◽  
Emergency Control ◽  
Number Of Generators ◽  
Simulation Results

In the summer peak load operation mode of the interconnected power grid which is integrated with HVDC transmission lines from Central China power grid to East China power grid, security and stability emergency control strategies based on generator shedding and EDCPS (Emergency DC Power Support) are studied to cope with system instability caused by Tuanlin-Fengjing DC line unipolar block fault. Simulation results show that interconnected system cannot maintain the transient stability effectively by using EDCPS only. A coordinated control strategy which combines generator shedding with EDCPS is proposed to reduce the number of generators to be shed and ensure the transient stability. Through optimizing EDCPS which two or more HVDC lines participate in, an optimal coordinated control strategy is proposed. Simulation results present that the strategy which combines GC shedding with Longzheng DC bipolar supporting is the optimal strategy.

scholarly journals Coordinated Stability Control Strategy for Intelligent Electric Vehicles Using Vague Set Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Yilin He ◽  
Jian Ma ◽  
Xuan Zhao ◽  
Ruoyang Song ◽  
Xiaodong Liu ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Control Strategy ◽  
Coordinated Control ◽  
Stability Control ◽  
Lateral Acceleration ◽  
Vague Set ◽  
Yaw Rate ◽  
Stability Performance ◽  
Control Target ◽  
Simulation Results

Aiming at improving the tracking stability performance for intelligent electric vehicles, a novel stability coordinated control strategy based on preview characteristics is proposed in this paper. Firstly, the traditional stability control target is introduced with the two degrees of freedom model, which is realized by the sliding mode control strategy. Secondly, an auxiliary control target further amending the former one with the innovation formulation of the preview characteristics is established. At last, a multiple purpose Vague set leverages the contribution of the traditional target and the auxiliary preview target in various vehicle states. The proposed coordinated control strategy is analyzed on the MATLAB/CarSim simulation platform and verified on an intelligent electric vehicle established with A&D5435 rapid prototyping experiment platform. Simulation and experimental results indicate that the proposed control strategy based on preview characteristics can effectively improve the tracking stability performance of intelligent electric vehicles. In the double lane change simulation, the peak value of sideslip angle, yaw rate, and lateral acceleration of the vehicle is reduced by 13.2%, 11.4%, and 8.9% compared with traditional control strategy. The average deviations between the experimental and simulation results of yaw rate, lateral acceleration, and steering wheel angle are less than 10% at different speeds, which demonstrates the consistency between the experimental and the simulation results.

Research on Jing-Jin-Tang Power Grid Coordinated Control Strategy

2015 ◽  
Vol 799-800 ◽  
pp. 1306-1310
Author(s):  
Fang Ming Niu ◽  
Peng Wang ◽  
Yu Cheng ◽  
Xue Dong Ren
Keyword(s):  
Control Strategy ◽  
Power Grid ◽  
Coordinated Control ◽  
Automatic Generation ◽  
Control Mode ◽  
Practical Significance ◽  
Control Effect ◽  
Spare Capacity ◽  
New Strategy ◽  
Grid Operation

The disadvantage of Beijing-Tianjin-Tangshan power grid operation control mode is that the control effect is poorer and the spare capacity demand is big, this paper puts forward a new coordinated control strategy. First of all, this paper describes the relationship between the load, frequency, the output of generating unit, the tie line power and the area control error relationship of the whole power grid, according to the regional automatic generation control performance assessment criteria, concludes the characteristics of regional unit adjustment. This paper analyzes the contradiction between them, and then proposes a coordinated control strategy between the Beijing-Tangshan power grid and Tianjin power grid. The case simulation results prove the superiority and feasibility of the new coordinated control strategy. Compared with the original, the new strategy reduces the volatility of the unit, shortens the recovery time of frequency, and has a certain practical significance.

Exploration of AGC Control Mode for North China-Central China-East China UHV Synchronous Power Grid

2013 ◽  
Vol 433-435 ◽  
pp. 1230-1236
Author(s):  
Jing Zhou ◽  
Ke Wang ◽  
Ya Ping Li ◽  
Dan Zeng
Keyword(s):  
North China ◽  
Frequency Control ◽  
Power Grid ◽  
Control Model ◽  
Active Power ◽  
Central China ◽  
Control Mode ◽  
East China ◽  
Centralized Control ◽  
The Future

With the continuous construction of ultra high voltage (UHV) power grid, East China-Central China North China will be interconnected via UHV lines to be a UHV synchronous grid in the future. Further expansion of the grid scale, the existing active power and frequency control mode has been unable to adapt to the new features. Based on the future structure of North China-Central China-East China synchronized power grid, the article built the whole network of the AGC control model using PSD-FDS full dynamic simulation program. By the simulation of examples, the problems of AGC control mode for UHV synchronous power grid has been pointed out visually. Finally, the paper presented an ideal AGC control mode called centralized control mode to deal with the new challenge.

scholarly journals Coordinated Optimal Control of Multiple Reactive Power Devices at Different Voltage Levels in UHVDC Near Zone

2020 ◽  
Vol 165 ◽  
pp. 06021
Author(s):  
Zongzu Yue ◽  
Xuhui Shen ◽  
Feng Yan
Keyword(s):  
Steady State ◽  
Power Output ◽  
Reactive Power ◽  
Power Grid ◽  
Coordinated Control ◽  
Central China ◽  
Voltage Collapse ◽  
Power Devices ◽  
Power Sources ◽  
Grid Voltage

Affected by different steady-state reactive power output ratios among generators, capacitors and other reactive devices in the end-to-end power grid, voltage collapse may occur due to the failure of the receiving-end AC system, and the problem of voltage stabilization in multi-DC feed systems is particularly common. For suppressing voltage collapse, sufficient dynamic reactive power support is an effective measure, and there are some differences in the dynamic support effect of different reactive power sources. The dynamic reactive power response of the generator and its reactive power margin are two important factors affecting the coordination and optimization of the reactive power of the generator. The comprehensive evaluation index is adopted to optimize the sequencing of the reactive power output of the generator near the DC drop point. A coordinated control method of dynamic and static reactive power for DC near-point systems at different voltage levels is proposed. By controlling the steady-state reactive power output ratio between multiple reactive devices, the node voltage is maintained near the target value, and reactive power control schemes at different voltage levels can be given to meet load changes. Finally, taking the actual situation of Central China Power Grid as an example, the results of different reactive voltage control strategies are compared and analyzed, which proves that the coordinated control strategy of multiple reactive power devices can significantly improve the stability of the receiving grid voltage.

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