当直流微电网锂电池DC/DC变换器采用传统虚拟直流发电机(virtual DC generator,VDCG)控制策略时无法均衡锂电池健康状态(state of health,SOH),增加锂电池维护成本。现有基于VDCG控制的方案仅能实现锂电池荷电状态(state of charge,SOC)参数均衡。因此,提出基于VDCG的非等容锂电池组SOH均衡策略。首先,结合VDCG和SOH估算公式,解析VDCG调节SOH原理。其次,结合容量差异对SOH均衡的影响重新设计调节系数。然后,将锂电池放电深度(depth of discharge,DOD)作为均衡变量与VDCG输出有功功率结合,通过调节有功功率均衡SOH参数实现SOH均衡。再次,建立基于VDCG控制方案小信号模型,通过根轨迹选取保证系统不失稳的控制参数。最后,MATLAB仿真软件获得的仿真波形验证了所提方案的有效性。
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