Crossing Power Governance Approach of Continuous Power Supply System in Electrified Railway
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摘要:
为消除牵引供电系统穿越功率的影响，同时兼顾再生制动能量利用，提出一种穿越功率治理的新方法. 首先，结合贯通供电系统结构推导不同工况下的功率潮流，分析穿越功率检测方法；其次，在单相组合式同相牵引变电所的基础上，设置功率转移与能量储存单元，分析改进后系统的工作机制；然后，通过功率分配与负序满意补偿的上层控制策略和变流器控制的底层控制策略相结合，提出穿越功率治理协同控制策略；最后，以某线路试验数据为例计算穿越功率大小，评估治理措施的经济性，同时通过仿真验证所提方案的正确性和有效性. 研究结果表明：本文所提出的系统及其控制策略能够有效消纳穿越功率和再生制动能量，在考虑牵引变电所和牵引网损耗的情况下，功率转移与能量储存单元的穿越功率利用率在70%以上，具有良好的经济性和可行性.
Abstract:A novel crossing power governance approach was proposed to mitigate the effects of crossing power in the traction power supply system while taking regenerative braking energy utilization into account. First, the power flow under different operating conditions was derived based on the structure of the continuous power supply system, and the method for detecting crossing power was analyzed. Second, a power transfer and energy storage unit was set using the single-phase combined co-phase traction substation, and the working mechanism of the improved system was analyzed. Then, a cooperative control strategy of crossing power governance was proposed by combining the upper control strategy of power distribution and negative sequence satisfactory compensation with the lower control strategy of converter control. Finally, the amount of crossing power was calculated using the experimental data of a railway line, and the cost-effectiveness of the governance measure was evaluated. In addition, the accuracy and efficacy of the proposed scheme were verified by simulation. The research results show that the proposed system and its control strategy can effectively mitigate the crossing power and regenerative braking energy, with the utilization rate of the crossing power of the power transfer and energy storage unit exceeding 70% in the case of traction substation and traction network loss. The system is highly economical and feasible.
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图 6 贯通供电下不同工况功率分配情况
Figure 6. Power distribution under different working conditions of continuous power supply
表 1 典型故障类型
Table 1. Typical failure types
故障所 故障装置 再生制动 穿越功率 变电所 1 故障 ESS PLS消纳为主，未消纳部分馈送电网；不影响穿越功率的消纳 PLS ESS消纳为主，未消纳部分馈送电网；不影响穿越功率的消纳 PTESU 馈送电网；不影响穿越功率的消纳 变电所 2 故障/变电所 1、2 同时故障 ESS PLS消纳为主，未消纳部分馈送电网 PLS ESS消纳为主，未消纳部分馈送电网 PTESU 馈送电网 
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表 2 功率分配关系
Table 2. Relationship of power distribution
实时功率 情况 1 情况 2 情况 3 情况 4 情况 5 情况 6 $ {P_{\rm{S}}} $ $ - \left( {\left| {{P_{\rm{L}}}} \right| - {P_{{\rm{PLS\_thshd}}}} - {P_{{\rm{ESS\_thshd}}}}} \right) $ 0 $ - \left( {\left| {{P_{\rm{L}}}} \right| - {P_{{\rm{PLS\_thshd}}}}} \right) $ 0 ${P_{\rm{L}}}$ ${P_{\rm{L}}} - {P_{{\rm{ESS}}}}$ $ {P_{{\rm{PLS}}}} $ $ - {P_{{\rm{PLS\_thshd}}}}$ $ - {P_{{\rm{PLS\_thshd}}}}$ $ - {P_{{\rm{PLS\_thshd}}}}$ $ - \left| {{P_{\rm{L}}}} \right|$ 0 0 $ {P_{{\rm{ESS}}}} $ $ - {P_{{\rm{ESS\_thshd}}}} $ $ - \left( {\left| {{P_{\rm{L}}}} \right| - {P_{{\rm{PLS\_thshd}}}}} \right) $ 0 0 0 $ {P_{{\rm{ESS}}}} $
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表 3 实测数据
Table 3. Measured data
工况 电流/A 电压/kV 有功功率/kW 变电所 1 合环前 66.50 28 0 变电所 1 合环后 144.50 28 1946 变电所 2 合环前 73.25 28 704 变电所 2 合环后 49.25 28 − 1299
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表 4 成本与收益
Table 4. Costs and benefits
万元 是否包含
储能装置运营
年份/年累计成本
和运维费累计节省
电费盈亏 含储能 1 1000 327.47 −672.53 2 1200 654.94 −545.06 3 1400 982.41 −417.59 4 1600 1309.88 −290.12 5 1800 1637.35 −162.65 6 2000 1964.82 −35.18 7 2200 2292.29 92.29 不含储能 1 800 327.47 −472.53 2 1000 654.94 −345.06 3 1200 982.41 −217.59 4 1400 1309.88 −90.12 5 1600 1637.35 37.35
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表 5 系统参数
Table 5. System parameters
参数 数值 电源电压等级/kV 110 三相输电线路/km 50 牵引变电所进线$ {L_{\rm{A}}} $、$ {L_{\rm{B}}} $/km 10、10 储能装置充放电功率/MW 2 10 kV动力照明系统/MW 2 牵引网长度/km 40
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