Could someone help me with this Abstract? I need an English correction, please

I can only make some suggestions because I don't know what the original work says. There aren't a lot of grammar errors in your translation but it sounds really heavy. 

This project proposal aims to analyze the Classical Antiquity of Roma representations and the uses in the didactic compendia of History used in the secondary public schools during the consolidation process of the Second Reign of Brazil.

I'm assuming Roma should be Rome. I'm assuming you mean history books used in high school when Brasil became unified.

Such analysis, in an original approach, will be led to attempt to make clear the redefinition about some elements of the Classic Old World to school subject of History, whose goals were also focused on the construction and consolidation of a new national identity, put together to the dictates of the Brazilian Imperial State.

The above sentence is a run on sentence and should be broken up into two thoughts.
"Using a unique approach, this analysis will attempt to make clear...." I'm having a hard time understanding the rest.

Using methodological principles based upon Renovated Political History (in which the concepts of Political Culture and Representation make up their central conceptual focal point),

I've never heard of Renovated Political History. Do you mean Modern Political History?
Central point and focal point can mean the same thing in this sentence so you are repeating yourself. 

we listed as the main documental sources of contemporary age the first textbooks of Ancient History used in Brazil educational system,

used in the Brazilian educational system

or better yet say, the translations of Poirzon’s and Caiz’s French works (Ancient History-1838) and the compendium of De Rozoir and Dumont (Roman History-1840). We think the idea about the teaching of Ancient History in the secondary imperial public schools,

What is an imperial school?

officially inaugurated in 1838 with Colégio Pedro II creation in Rio de Janeiro, defined the parameters of historical narrative based on political values which does not only present a long time of chronological limits of the Imperial State of Brazil, but also huge contrasts about national political context from that period and its imperial system of government.

The above sentence needs a lot of work, it doesn't really express a clear thought. 

Could someone help me with this Abstract? I need an English correction, please

This project proposal aims to analyze the Classical Antiquity of Roma representations and the uses in the didactic compendia of History used in the secondary public schools during the consolidation process of the Second Reign of Brazil. Such analysis, in an original approach, will be led to attempt to make clear the redefinition about some elements of the Classic Old World to school subject of History, whose goals were also focused on the construction and consolidation of a new national identity, put together to the dictates of the Brazilian Imperial State. Using methodological principles based upon Renovated Political History (in which the concepts of Political Culture and Representation make up their central conceptual focal point), we listed as the main documental sources of contemporary age the first textbooks of Ancient History used in Brazil educational system, or better say, the translations of Poirzon’s and Caiz’s French works (Ancient History-1838) and the compendium of De Rozoir and Dumont (Roman History-1840). We think the idea about the teaching of Ancient History in the secondary imperial public schools, officially inaugurated in 1838 with Colégio Pedro II creation in Rio de Janeiro, defined the parameters of historical narrative based on political values which does not only present a long time of chronological limits of the Imperial State of Brazil, but also huge contrasts about national political context from that period and its imperial system of government.

Is it better now the last paragraph?

We think about the idea of Ancient History teaching in public high school in the Empire Age, officially opened in 1838 with the construction of Colégio Pedro II in Rio de Janeiro, defined the parameters of historical narrative based on political values which did not only last a long time of Brazilian Imperial State that overcame its own limit, but also presented large contrasts in regard to national political context from that period and imperial system of government.

thanks a lot!