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When WLSE method is applied for only active power injection measurement vector then the estimation of ‘x’ is
xest(δ)P+1=xest(δ)P+H1PTWPZP-hpxestP
xest(δ)P+1=xest(δ)P+H1PTWPH1PH1PTWPZP-hpxestP
xest(δ)P+1=xest(δ)P+H2PTWPH2P-1H2PTWPZP-hpxestP
xest(δ)P+1=xest(δ)P+H1PTWPH1P-1H1PTWPZP-hpxestP