Abstract: The receiving end hybrid line commutated concerter based voltage source converter（LCC-VSC）not

only has the advantages of LCC and VSC，but also adopts the structure of high-voltage valve group LCC and lowvoltage valve group three-end parallel VSC in series at the receiving end. Therefore，the receiving end hybrid LCCVSC has greater transmission capacity，low manufacturing difficulty and low cost. With these advantages，it is a very promising techonlogy of the future power system and has great application prospects. However，the DC side harmonic characteristics have a great impact on the control and protection strategy of the whole receiving end hybrid LCC-VSC system. Unfortunately，this problem is not studied fully. Therefore，the harmonic equivalent models of LCC，DC filter and VSC were established. Moreover，the DC side harmonic calculation equivalent model was proposed on basis of the receiving end hybrid LCC-VSC topology and the harmonic equivalent models. Theoretical analysis and simulations of a receiving end hybrid LCC-VSC project shows that the calculation error of the proposed model is no more than 10%.

      Key words: line commutated converter based high voltage direct current（LCC-HVDC）；HVDC flexible；

receiving end hybrid LCC-VSC；DC filter；DC side harmonic