Resilience enhancement-oriented energy storage control method and system for distributed generator (DG) in distribution network

A resilience enhancement-oriented energy storage control system for a DG in a distribution network, comprising:

• an objective function determining unit configured to determine an objective function, wherein the objective function comprises a first sub-objective function and a second sub-objective function, the first sub-objective function aims to minimize an investment cost at an outer level, and the second sub-objective function first aims to maximize an LS cost and a post-disaster operation cost at a middle level, and then minimize an LS cost and a post-disaster operation cost at an inner level;
• an outer-level constraint determining unit configured to determine an outer-level constraint based on a quantity of configured ESSs, a quantity of hardened lines, and a rated power and capacity configuration of an ESS;
• a middle-level constraint determining unit configured to determine a middle-level constraint based on a line failure;
• an inner-level constraint determining unit configured to determine an inner-level constraint based on node power of a distribution network, a line load capacity, a line power flow, a power output of a unit, a node voltage, climbing of the unit, operation of the ESS, and LS;
• a parameter determining unit configured to determine, based on the outer-level constraint and the first sub-objective function, a unit hardening investment cost cich of a line, a line length sij, a binary decision variable yij for line hardening, a first cost coefficient ce, a second cost coefficient cp, and a capacity EiR and rated power PiR of an ESS configured on node i;
• and determine a power output cgG of a DG, a unit cost coefficient cich of charging of the ESS, a unit cost coefficient cidis of discharging of the ESS, a unit LS cost ciLS after a load weight is considered, an LS ratio ρi,t of node i, and load pi,tD of node i based on the middle-level constraint, the inner-level constraint, and the second sub-objective function;
• and
• an energy storage control unit configured to control energy storage of the DG in the distribution network based on the obtained parameters.