Pattern Analysis of Future HVDC Grid Development

Wind energy has the advantages of wide distribution, renewable, and non-polluting, so it is receiving more and more attention from more and more countries. As more and more wind power systems are integrated into the grid, it has an impact on the stability of the grid. To keep the power system stable, there is an urgent need for a grid simulator that can simulate various behaviors of the grid and test the reliability of the wind turbine before grid integration. Inverters, especially multilevel inverters, as the core part of the grid simulator, have been widely studied by scholars in recent years. However, compared to conventional inverters, multilevel inverters are characterized by high code development effort, great difficulty, and a long development period. In this paper, we adopt an automatic DSP code generation method with MATLAB hardware support package and give a complete system design method and development flow based on MATLAB and TMSF28335 automatic code generation. Finally, we take the closed-loop three-level MMC inverter as an example, propose an equalization algorithm suitable for automatic code generation for the capacitor-voltage balancing part, and verify the feasibility of the DSP automatic code generation in a multilevel inverter development. The feasibility of DSP automatic code generation in the development of a multilevel inverter is verified. The experimental results show that the proposed equalization algorithm with variable reference coefficient and DSP automatic code generation method can be used in the development of a multilevel inverter, which can improve development efficiency and reduce development costs.

https://iopscience.iop.org/article/10.1088/1742-6596/2503/1/012100/pdf

Implementation of Automatic DSP Code Generation Based on Closed-loop Algorithm for Three-level Inverters

With the intensive outfeed of large-capacity high voltage direct current (HVDC) transmission links, the grid pattern, operational paradigm, and stability characteristics of the sending-end grid have undergone profound changes. In this paper, an evaluation index system is proposed to evaluate the adaptability of expansion planning schemes of the sending-end power grid with multiple HVDC links. The constructed evaluation index system comprehensively takes into account four aspects: economic development, generation mix, system strength, as well as security and stability. According to given grid planning schemes, the realization process of the evaluation index system is proposed to assessment the adaptability of the multi-send HVDC power grid. Sichuan Grid, a large-scale provincial power system in China, is taken as an example to compare the evaluation results under different expansion planning schemes.

Adaptability Evaluation of Multi-Send HVDC Power Grid Planning Schemes

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Balancing and Controlling of Modular Multilevel Converter Voltage Integration into Hvdc Transmission Lines on Smartgrid System

pdf/investigation-and-performance-optimization-of-modular-3207m2zkikxy.pdf

Investigation and Performance Optimization of Modular Multilevel Converter-based HVDC Systems for Smart Grids: Control, Harmonic Analysis and Power Quality Enhancement

Virtual capacitance based control for MMC-HVDC systems connected with weak AC grids

Renewable energy will play an important role in the future energy development of West China. Voltage source converter based on high voltage direct current (VSC-HVDC) has a strong regulation capability of voltage and power, and can be interconnected with weak AC grid or even passive grid. A ± 1000kV large west sending terminal DC power grid based on VSC-HVDC is constructed, by which with rich distributed resources in West China can be centrally dispatched to East China, avoiding the uncertainty impact of renewable energy power generation on power system stability. Steady and transient characteristics of the sending terminal DC grid are simulated and analyzed.

Scheme and Operation Characteristic Analysis of Large Sending Terminal DC Grid Based on Flexible DC in West China

Accurate modeling and simulation for all power and electronic components can greatly improve the simulation accuracy, but the calculation time is too long. Due to the characteristics of centralized operation and distributed control in power network, each region’s data is highly confidential, so it is difficult for the control center of one region to obtain the data of other regions. In actual engineering, the user's research object is often only a certain part of the system, so it is very necessary to perform equivalent calculations on other parts of the system, which can greatly reduce computer memory and improve simulation speed. This review paper introduces the basic principles, advantages and disadvantages of 3 types of equivalent methods, static equivalents, dynamic equivalents and frequency-dependent network equivalents (FDNE), then introduces the development of equivalent software, summarizes the problems existing in equivalent methods at present, and points out possible research directions in the future.

Review of Equivalent Methods for Power System

At this stage, on the power supply system (PSS) terminal and the customer end, there are many kinds of researches of the energy storage’s (ES) application. However, the scientific research on the multi-zone collaborative production scheduling of new energy (NE) and ES on the power network is still in the development link. Therefore, the key scientific research on the application of ES on the power network is in this article. Based on clock frequency simulation, the paper creates a long-time multi-zone production scheduling entity model in which NE and ES operate harmoniously in the power network and puts forward the best operation countermeasures for NE and ES in different regions. Based on the power network’s data information in a specific place in our country, the simulation tests the entity model and production scheduling countermeasures created in the article. The simulation results show that for the PSS with extensive operation of new ES, the introduction of ES can increase the processing speed of new one and reduce the system’s total carbon consumption level (TCCL).

Optimal Operation Method of Power System With Large-scale New Energy and Storage Based on Multi- Zoning

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Papers

Virtual capacitance based control for MMC-HVDC systems connected with weak AC grids

Scheme and Operation Characteristic Analysis of Large Sending Terminal DC Grid Based on Flexible DC in West China

Review of Equivalent Methods for Power System

Optimal Operation Method of Power System With Large-scale New Energy and Storage Based on Multi- Zoning