Evaluation of an Optimal Radial-Loop Configuration for a Distribution Network With PV Systems to Minimize Power Loss

In order to verify the applicability of the computer numerical simulation method under complex engineering conditions, and solve the problem that it is difficult to guarantee the normal construction of underground projects with a depth of more than 1 km (it is difficult to carry out multiple field attempts under highdepth conditions, and if you simply use ordinary the calculation method, its calculation accuracy is difficult to guarantee). For the construction of complex geological conditions of an underground mine with a depth of 1300 m in the Central Plains of China, based on the finite difference method (FDM) with high calculation accuracy, using FLAC 3D software based on FDM, and using progressive design method (PDM) [1], design a variety of different schemes and analyze the mechanism of force and deformation of the surrounding rock mass of the project. Apply the obtained optimal scheme in actual engineering, and monitor the actual force and deformation. Comparing the results of the computer numerical simulation with the monitoring results, the results show that the computer numerical simulation method can also have good application in the actual engineering under the geological conditions of ultra-kilometer depth. It also provides theoretical basis and technical guidance for engineering hypothesis under approximate conditions.

Section: A Establishment Of the Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Computer Method in Solving Complex Engineering Technical Problems

Qiao

et al. 2021

“…The power flow constraint (7), VSC loss constraint (13) and FDS loss constraint ( 16) are nonlinear quadratic constraints, which can be further relaxed to the following second-order cone constraints:…”

Section: Model Transformationmentioning

confidence: 99%

“…In [12], "budget of uncertainty" is set to overcome the conservatism caused by only considering the worst scenarios in the system, and also improves the economy. However, most robust optimization only uses the single objective model, which cannot fulfill the requirements of flexibility, economy and safety in the AC/DC hybrid distribution network with multiple uncertainties [13]. In [14], a robust optimization model is established to co-optimize the slopes of active and reactive power droop control of VSCs with the aim to minimize the total network losses, whose objective function only includes distribution network losses.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Robust Optimization of Hybrid AC/DC Distribution Networks Considering Flexible Interconnection Devices

Wang¹,

Liang

2021

Hybrid AC/DC distribution networks with the high-efficiency consumption and highproportion access of new energy have become a crucial trend for future modern distribution networks. High penetration of renewable energy brings various controllable resources along with uncertainties to hybrid AC/DC distribution networks, making conventional single objective optimization fail to meet optimal operation requirements of flexibility and reliability. In this paper, considering uncertainties of distribution generations and loads, a multi-objective robust optimization model based on various controllable devices is proposed. To increase resource utilization, the proposed method comprehensively and properly models the full variety of possible control means (i.e., flexible distribution switch, voltage source converter, energy storages, et al). Utilizing the abundant control means, a multi-objective optimization which minimizes network losses, voltage deviations and operation cost simultaneously is modeled. Then, based on the multiobjective model, a two-stage robust optimization based on second order cone method and column constraint generation algorithm is proposed to achieve the solution, which can deal with the fluctuation of loads and renewable energy quickly and effectively. Outdoing traditional single objective robust optimization, our multi-objective robust optimization utilizes various controllable resources, obviously improving the safety, flexibility and economy simultaneously. Finally, compared with existing robust optimization, the proposed method is tested in numerous case studies to verify its effectiveness and advantages in a modified IEEE 33node system.

“…In order to meet the new requirements of economic, social and reform and development, and cope with multiple pressures such as ensuring the safe operation of power system, promoting market-oriented operation and meeting rigid investment demand, the rational planning and accurate control of distribution network project planning and construction is one of the basic conditions for whether the power network can supply high reliability and high quality power [9][10]. In view of the demand for lean management and accurate investment decision-making of distribution network, the differentiated classification and evaluation method of distribution network as the key link of its future development investment and decision-making [11][12] has gradually become a research hotspot carried out by scholars.…”

Section: Introductionmentioning

confidence: 99%

Research on Differentiated Classification System of Distribution Network Based on Grading and Zoning

Zhou

Deng²,

et al. 2021

In order to cope with multiple pressures such as ensuring the safe operation of the distribution network, promoting market-oriented operation, and satisfying rigid investment needs, power grid companies must implement a lean management approach. In response to the lack of systematic classification and evaluation methods for the distribution network in precise investment and future planning, this paper proposes a multi-dimensional hierarchical sub-regional distribution network differentiation classification system covering provinces, cities (counties), urban power supply units, towns, and villages. In the dimensions of provinces and cities (counties), based on the data fitting analysis of per capita electricity consumption, the classification method of the development stage of the power grids is obtained, and the provinces and cities (counties) are classified into pioneering benefits, steady improvement, and excellence three stages; in the dimension of urban power supply units, based on the combination of "top-down" and "bottom-up", the urban power supply units are divided into three categories: A+, A, and B; in the dimensions of towns and villages, according to characteristics indicators and construction models, proposed classification schemes for towns and villages. Finally, the results of an example analysis show that the differentiated classification system proposed in this paper can achieve an accurate assessment of the current development status of the distribution network, and provide important guidance for the precise investment of the distribution network in the future.