Coordination control method of voltage balancer in all-photovoltaic direct-current power grid mode

The invention discloses a coordination control method for a voltage balancer in an all-photovoltaic direct-current power grid mode. The coordination control method comprises the following steps: firstly, constructing a radial multi-node bipolar all-photovoltaic direct-current networking structure of an integrated voltage balancer, and proposing a mathematical model of influence of line resistance, load resistance and a switch duty ratio on direct-current bus current; analyzing a dynamic equation of the voltage balancer, and constructing secondary control based on a consistency algorithm; the modulus consistency coordination control for regulating and controlling unbalanced voltage by utilizing a voltage balancer is provided by integrating primary control and secondary control; and the multi-node bipolar full-photovoltaic direct-current network completes regulation and control of unbalanced voltage of the positive electrode and the negative electrode according to the proposed modulus consistency control strate