Energy Management and Capacity Allocation Scheme for Co-phase Traction Power Supply and Energy Storage System in Electrified Railways
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摘要:
为进一步降低电气化铁路对三相电网的负序影响，兼顾牵引变电所节能经济运行，提出了一种电气化铁路同相储能供电系统能量管理策略和容量配置方案. 首先，以三相电压不平衡度限值为约束，确定了不同负序超标情况下储能装置启动阈值；而后，建立了储能供电系统负序补偿模型，计算储能装置充放电电流；最后，以牵引变电所实测数据为例，给出储能装置容量配置方案，并计算验证了所提能量管理策略的可行性和正确性. 研究结果表明：该同相储能供电系统通过实时控制储能装置充放电，可实现负序满意度补偿、负荷削峰填谷、兼顾再生能量利用，负序补偿度由储能装置放电功率决定，削峰填谷效果和再生能量利用率由储能装置启动阈值和储能容量决定；储能容量一定时，越小阈值，再生制动能量利用率越高.
Abstract:In order to reduce the impact of electrified railways on the negative sequence of three-phase power grid, and consider energy-saving and economic operation of traction substations, an energy management strategy and capacity allocation scheme is proposed for the co-phase traction power supply and energy storage system in electrified railways. Firstly, with the constraint of the three-phase voltage unbalance limit, the starting threshold of the energy storage device is determined in the cases of the negative sequence exceeding standard. Then the negative-sequence compensation model of the power supply and energy storage system is established to calculate its charging and discharging current. The measured data of traction substations are used to develop the capacity allocation scheme of the energy storage device, which are then validated by the calculation. The results show that the co-phase traction power supply and energy storage system can control the charge and discharge of the energy storage device in real time to realize negative-sequence satisfaction compensation, load peak shaving and valley filling, and regenerative energy utilization. The degree of negative sequence compensation is determined by the discharge power of the energy storage device. The peak-shaving and valley-filling effect and regenerative energy utilization rate are determined by the starting threshold and the capacity of the energy storage device. When the energy storage capacity is constant, the smaller the threshold, the higher the utilization rate of regenerative braking energy.
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图 2 同相储能供电系统端口电压矢量图
Figure 2. Voltage vector diagram of port in co-phase power supply and energy storage system
图 3 负序电压不平衡度排列曲线
Figure 3. Sequence curve of negative-sequence voltage unbalance degree
图 4 同相储能供电系统工况
Figure 4. Working conditions of co-phase power supply and energy storage system
图 5 不同工况负序相量图
Figure 5. Negative-sequence phasor diagram under different working conditions
图 9 安装储能装置前后负序电压不平衡度排列曲线
Figure 9. Sequence curve of negative-sequence voltage unbalance degree with and without energy storage system
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