The volatility of wind power makes it more prominent the reactive power and voltage control of wind farms clusters, which is studied from the perspective of regional control as the main tendency at present. This paper designs a multi-objective reactive power optimization and voltage control strategy for wind farms cluster, which is based on the analysis of wind power fluctuation characteristics and reactive power compensation characteristics. The optimization model includes the day-ahead optimization and the intra-day optimization. At first, pre-optimizing each discrete reactive power compensation device by taking into account wind power output characteristics in the former mode. While in the intra-day optimization, the controlling center optimizes the compensation amount of different reactive compensation devices based on the optimization results of the day-ahead optimization model. The case study of a practical wind farms cluster is modeled with the proposed strategy. The primal-dual interior point method (PDIPM) was used to solve the optimization model and the simulated results verified the effectiveness of the proposed method.

Multi-time-scale Coordinative and Complementary Reactive Power and Voltage Control Strategy for Wind Farms Cluster

This paper proposes a novel reactive power allocation optimization method based on the bi-level programming (BP) model. Considering hierarchical voltage/ var control in partitioned distribution network and dynamic coupling relationships between periods, the BP model is applied to make a research on the optimized expansion of existing allocation. In the proposal, lower model aims to maximize the balance of reactive power locally while upper model targets at minimizing the voltage deviation from expected value. Besides the upper and lower model are interlinked and coordinated through the nodal voltage. Simultaneously, two contribution factor indexes are employed to quantify the ability of improving the voltage quality and optimizing the branch flow. And these indexes can be derived from the voltage-var sensitivity and branch flow-var sensitivity. Then according to the indexes, the best ones are chosen as compensation nodes and employed in the bi-level programming model. Finally the results of the American PG&E 69-buses distribution network validate the rationality and effectiveness of the proposed method.

Bi-level programming based optimal reactive power allocation for hierarchical voltage/var control in partitioned distribution network

Considering the voltage problems of district power network with large-scale new energy, the reactive power optimization model is discussed in this paper, and the renewable power plants are taken as continuous reactive power adjustment means to participate in the optimization. From two time scales of day-ahead and real-time, a three-level dynamic optimization model for coordinated control of district power network and new energy station is built and different objective functions are constructed of each level according to different needs and control variables. Finally, a case of district power network is used to validate the proposed model, and the results show that the model can ensure the safe operation of the grid at different load levels.

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Research on reactive power optimization of district power network with large-scale new energy

Under the environment of AVC (Automatic Voltage Control), this paper proposes a new idea about solving the power system dynamic reactive power optimization problem to coordinate with and adaptation of AVC, with the analysis of effect and mechanism of reactive power source and load. And based on the idea, it gives a practical solution method of reactive power optimization between the dynamic and static. According to the property of reactive power sources and the key features of reactive power load circle variation, it makes full use of continuous reactive power regulation resources, to realize the effective optimal combination of discrete reactive power resources ahead of the day time, which will be the foundation of further research.

A practical solution method of dynamic reactive power optimization in AVC

By combining with the latest theoretical results of distribution voltage control for distribution network, a voltage control simulation system based on. NET platform of distribution network containing a large number of photovoltaic power sources is designed and developed, which provides supplementary analysis for planning decision-making of voltage control. The system is developed in Microsoft Visual Studio 2010 platform integrated with the GIS plug-in component MapX. In the end, a modified IEEE33-69case is used to validate the feasibility of the proposed simulation system.

Simulation Method and Software Platform Development for Voltage Control of Distribution Network with Large-scale Photovoltaics

Operating times constraint of discrete control equipment results in a space-time close coupled problem in dynamic reactive power optimization.A new method is proposed to assign the operating time of equipment properly so as to achieve the optimization as a whole.The method determines preliminary operating table of equipment by static reactive power optimization results and operating constraints,which indicates whether an equipment is allowed to operate or not.Optimization is carried out with the operation allowable equipments in the researched period.With the optimization results of that period and operating constraints in the whole day,the operating table of subsequent periods can be renewed and decoupling of 24 periods can be realized as well.The new method is not only simple in modeling,but also easy in implementation.Test results have shown that it can reduce daily power loss and meet the needs of real-time operation within allowable daily operating times.

Simplified Method of Dynamic Reactive Power Optimization and Its Implementation

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Simplified Method of Dynamic Reactive Power Optimization and Its Implementation