基于线性化的交直流混合配电网运行优化

Operation Optimization of AC/DC Hybrid Distribution Network Based on Linearization

高比例的新能源和直流负载的接入给配电网带来了全新的挑战,随着基于电压源换流器(voltage source converter, VSC)的换流技术不断发展,交直流混合配电网因其能够为分布式电源提供高效经济的接入方式而得到了越来越广泛的应用。提出了一种含有分布式电源、储能和VSC的交直流混合配电网运行优化模型,该模型以配网购电成本、弃风弃光成本、网损成本和储能日运行维护成本之和构成的系统综合运行成本最小为目标,优化配网购电量、VSC的功率和储能的充放电策略。针对该混合整数非线性模型带来的求解困难的问题,提出了一种考虑网损的线性化方法对模型进行线性化处理,该方法没有网架拓扑形式的限制,具有更广泛的适用性。最后,在改造的13节点算例中验证了所提方法的有效性和准确性。

The access of a high proportion of new energy and DC loads has brought new challenges to the distribution network. With the continuous development of the converter technology based on voltage source converter(VSC), the AC/DC hybrid distribution network has been more and more widely used because it can provide an efficient and economical access method for distributed power sources. An operation optimization model of AC/DC hybrid distribution network including distributed power generation, energy storage and VSC is proposed. The goal is to minimize the comprehensive operating cost of the system consisting of the sum of the power purchase cost of the distribution network, the cost of abandoning wind and solar energy, the cost of network loss and the daily operation and maintenance cost of energy storage, and the power purchase of the distribution network, the power of the VSC and the charging and discharging strategy of the energy storage are optimized. To solve the problem that the mixed integer nonlinear model is difficult to solve, a linearization method considering network loss is proposed to linearize the model. This method is not limited by the topology of the grid, and has wider applicability. Finally, the effectiveness and accuracy of the proposed method are verified in a modified 13-node example.