Prediction of restriction in output current by reactant flow in redox flow battery for compensating load variations

Prediction of restriction in output current by reactant flow in redox flow battery for compensating load variations
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预测氧化还原液流电池中反应物流对输出电流的限制,以补偿负载变化

DOI:
10.1002/cta.2881
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发表时间:
2020
影响因子:
2.3
通讯作者:
Hikihara Takashi
Hikihara Takashi
中科院分区:
工程技术3区
文献类型:
--
作者:
Mannari Toko;Okuda Takafumi;Hikihara Takashi

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连接到电网的氧化还原液流电池(RFBs)可以吸收出现在多个时间尺度上的负载变化。RFB由作为化学反应元件的电池堆和作为存储元件的罐组成。电解质在它们之间泵送和循环。只要反应物被供应到电池堆,电池堆就可以供应功率。反应物流向电池的速度慢限制了输出电流,并且在电流限制下,RFB不能提供所需的功率。反应物流量应被考虑,以确认RFB是否可以在负载变化时提供所需的功率。本文提出了一种通过模拟反应物流量来预测电流限制的方法。该方法基于化学反应模型。该模型使我们能够模拟反应物浓度的时间演变,这决定了RFB的电学行为和反应物流量。从反应物流的电流被引入到估计由反应物流的慢速度的电流限制。所提出的方法很好地预测了原型RFB的电流限制,该原型RFB被集成到A类放电电路中。
Redox flow batteries (RFBs) connected to the power grid can absorb load variations which appear in several time scales. An RFB consists of a cell stack as the chemical reaction element and tanks as the storage element. Electrolytes are pumped and circulated between them. The cell stack can supply power as long as reactants are supplied to the stack. The slow velocity of the reactant flow to the cells restricts the output current, and the RFB can not supply the requested power under the current restriction. The reactant flow should be considered for confirming whether the RFB can supply the requested power at load variations. This paper proposes the method to predict the current restriction by the reactant flow through simulations. The method is based on a chemical reaction model. The model enables us to simulate the time evolution of the reactant concentration, which governs the electrical behavior and the reactant flow of the RFB. The current available from the reactant flow is introduced to estimate the current restriction by the slow velocity of the reactant flow. The proposed method predicts well the current restriction of the prototype RFB, which is integrated into a‐A class discharging circuit.
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