Fig 1.
Frequency step response of VSG when D is constant (D = 1) and J is different.
Fig 2.
Frequency step response of VSG when J is constant(J = 1 kg•m2) and D is different.
Fig 3.
The power closed-loop control structure of VSG.
Fig 4.
Frequency step response of VSG when D is constant (D = 1) and J is different.
Fig 5.
Frequency step response of VSG when J is constant(J = 1 kg•m2) and D is different.
Fig 6.
Closed-loop pole distribution of G2(s).
Fig 7.
VSG power-frequency control structure after introducing leading differential control link.
Fig 8.
Frequency response of the improved VSG based on leading differential control GA1(s).
Fig 9.
Frequency response of the improved VSG based on leading differential control GB1(s).
Fig 10.
Power-frequency control structure of the improved VSG based on leading differential control.
Fig 11.
Improved VSG frequency step response.
Fig 12.
The change trajectory of GB2_n (s) pole when T is changed.
Fig 13.
The change trajectory of GB2_n (s) pole when C is changed.
Fig 14.
VSG off-grid and on-grid system topology.
Fig 15.
Real-time simulation experiment platform based on RT-LAB.
Table 1.
Load variation.
Table 2.
Control strategy and control parameters.
Fig 16.
Traditional VSG frequency and active power.
Fig 17.
Variation of improved VSG frequency and active power.
Table 3.
Control strategy and parameter setting.
Fig 18.
Frequency and active of traditional VSG.
Fig 19.
Frequency and active of the improved VSG.