A power system comprising: a power source comprising a solar power source; a DC bus for receiving DC power from the power source; a line side converter electrically coupled to the DC bus for converting the DC power from the DC bus to AC power with a regulated voltage output to feed an electrical system; and a power conversion control system comprising a line side controller for controlling operation of the line side converter; wherein the power conversion control system is configured to: obtaining a power imbalance signal according to a power command signal (Pcmd) and a power feedback signal (Pfeedback), wherein the power command signal comprises the maximum power from a maximum power point tracking circuit connected to a power source; using the power imbalance signal to generate an internal frequency signal (ω); integrating the internal frequency signal (co) to generate a phase angle signal (θ); obtaining a DC voltage difference signal according to a DC voltage command signal (Vdc_cmd) and a DC voltage feedback signal (Vdc_feedback); and using the DC voltage difference signal to directly or indirectly adjust the phase angle signal (θ); wherein the power feedback signal comprises: a measured power signal representative of the AC power from the line side converter; a measured power signal of the DC power on the DC bus; or a combination thereof. a power source comprising a solar power source; a DC bus for receiving DC power from the power source; a line side converter electrically coupled to the DC bus for converting the DC power from the DC bus to AC power with a regulated voltage output to feed an electrical system; and a power conversion control system comprising a line side controller for controlling operation of the line side converter; wherein the power conversion control system is configured to: obtaining a power imbalance signal according to a power command signal (Pcmd) and a power feedback signal (Pfeedback), wherein the power command signal comprises the maximum power from a maximum power point tracking circuit connected to a power source; using the power imbalance signal to generate an internal frequency signal (ω); integrating the internal frequency signal (co) to generate a phase angle signal (θ); obtaining a DC voltage difference signal according to a DC voltage command signal (Vdc_cmd) and a DC voltage feedback signal (Vdc_feedback); and using the DC voltage difference signal to directly or indirectly adjust the phase angle signal (θ); wherein the power feedback signal comprises: a measured power signal representative of the AC power from the line side converter; a measured power signal of the DC power on the DC bus; or a combination thereof. obtaining a power imbalance signal according to a power command signal (Pcmd) and a power feedback signal (Pfeedback), wherein the power command signal comprises the maximum power from a maximum power point tracking circuit connected to a power source; using the power imbalance signal to generate an internal frequency signal (ω); integrating the internal frequency signal (co) to generate a phase angle signal (θ); obtaining a DC voltage difference signal according to a DC voltage command signal (Vdc_cmd) and a DC voltage feedback signal (Vdc_feedback); and using the DC voltage difference signal to directly or indirectly adjust the phase angle signal (θ); wherein the power feedback signal comprises: a measured power signal representative of the AC power from the line side converter; a measured power signal of the DC power on the DC bus; or a combination thereof. a measured power signal representative of the AC power from the line side converter; a measured power signal of the DC power on the DC bus; or a combination thereof.