Abstract
In order to cope with the uncertainty power and consumption problems in AC/DC distribution networks after accessing high-permeability renewable energy source (RES), a flexible economic dispatching method for the AC/DC distribution networks considering the uncertainty of wind power is proposed based on the flexibility operation theory. First, considering the flexibility of regulation range, speed, and time, the source-network-load flexibility resources of AC/DC distribution networks are quantitatively evaluated. An evaluation index and a calculation method of the operation flexibility for the AC/DC distribution networks are defined. Then, based on the nonparametric kernel density estimation and confidence interval method, the constraints transformation of flexibility requirement in distribution networks considering the uncertainty of wind power is implemented. Finally, a multi-objective day-ahead flexible and economic dispatching model of the AC/DC distribution networks is established, which takes the operation economy and voltage quality of distribution networks as the objective function and the controllable operation parameters of voltage-source converters (VSCs) and AC/DC networks as the decision variables. The modified IEEE-33 system with flexible multi-terminal interconnection is simulated and analyzed. The result shows that the proposed method further improves the node voltage level and the RES consumption level and reduces the network losses and the total dispatching cost while ensuring the AC/DC distribution network to cope with the fluctuation of the system uncertainty.
Highlights
The deteriorating environment and the shortage of traditional energy further promote the development of renewable energy generation technology
Constraints of various controllable devices, the day-ahead predictive output of wind turbines, photovoltaic generators and electric vehicles; Aiming at the local dispatching layer, according to the optimization objective, the combined output of wind-storage is optimized by using Yalmip&Cplex, and full-time charging and discharging powers of energy storages are determined under the condition of meeting the output constraints and capacity constraints; Aiming at the regional dispatching layer, after obtaining the operation mode of the local dispatching layer, the control parameters of controllable devices and voltage source converters (VSCs) are optimized based on alternating iterative power flow algorithm for hybrid AC/DC networks and dual particle swarm optimization algorithm
By using the kernel density estimation method and confidence interval method, the flexibility requirement constraints considering the uncertainty of the wind power are transformed and applied to the day-ahead flexible economic dispatching model
Summary
The deteriorating environment and the shortage of traditional energy further promote the development of renewable energy generation technology. The constraint transformation of the flexibility demand in distribution networks considering the uncertainty of wind power is implemented by the non-parametric kernel density estimation and confidence interval method. Considering the coordinated operation scheduling method of VSCs and controllable devices in AC/DC distribution networks, the multi-objective flexible operation dispatching method considering the uncertainty of wind power is proposed . The effect of VSCs on the operation flexibility of distribution networks is attributed to its active and reactive power decoupling regulation ability, whose constraints are as follows: Ucmin,i ≤ Ucti −Icmax,i ≤ Icti. The non-parametric kernel density estimation method is used to solve the conditional probability distribution of the prediction error of wind power output under a predicted value. Considering the flexibility requirement of the distribution networks operation, the quantitative flexibility index constraints are incorporated into the dispatching model to ensure that the economic dispatching scheme can maximize economic benefits and meet the flexible adjustment requirement of AC/DC distribution networks accessing highpermeability RES
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