A piezoelectric generator system comprising at least one piezoelectric generator unit, each generator unit comprising: an array of piezoelectric modules (M ji,i), each of said piezoelectric modules (M ji,i) comprising a piezoelectric element (E ji,i) and an alternating current/direct current converter (C ji,i) for converting alternating current generated by the piezoelectric element (E ji,i) into direct current; the array of piezoelectric modules (M ji,i) comprising a number of sets (i) of said piezoelectric modules (M ji,i), each of said sets (i) electrically connected to each other in parallel; the sets (i) of piezoelectric modules (M ji,i) comprising a number (j 1, j 2,... j i) of piezoelectric modules (M ji,i) electrically connected to each other in series; the array being intended to supply electric power (P out) when said piezoelectric modules (M ji,i) are mechanically driven by at least one dynamic load (F 1, F 2.. F n) such that an electrical voltage (V out) in each set (i) of piezoelectric modules (M ji,i) is substantially the same; characterized by an input force control device for controlling said dynamic loads (F 1, F 2.. F n) such that only a predetermined amount of force with a predetermined speed of application acts on the piezoelectric modules (M ji,i) such that a predetermined electric power (P out) is supplied by the piezoelectric generator unit; and said input force control device comprising an activation plate for evenly distributing the predetermined force acting on the piezoelectric modules (M ji,i) such that they all receive substantially the same predetermined force, substantially at the same moment and substantially for the same time; and a damping element suitable for damping the dynamic load or force (F 1, F 2.. F n) so as to protect the piezoelectric modules (M ji,i). an array of piezoelectric modules (M ji,i), each of said piezoelectric modules (M ji,i) comprising a piezoelectric element (E ji,i) and an alternating current/direct current converter (C ji,i) for converting alternating current generated by the piezoelectric element (E ji,i) into direct current; the array of piezoelectric modules (M ji,i) comprising a number of sets (i) of said piezoelectric modules (M ji,i), each of said sets (i) electrically connected to each other in parallel; the sets (i) of piezoelectric modules (M ji,i) comprising a number (j 1, j 2,... j i) of piezoelectric modules (M ji,i) electrically connected to each other in series; the array being intended to supply electric power (P out) when said piezoelectric modules (M ji,i) are mechanically driven by at least one dynamic load (F 1, F 2.. F n) such that an electrical voltage (V out) in each set (i) of piezoelectric modules (M ji,i) is substantially the same; characterized by an input force control device for controlling said dynamic loads (F 1, F 2.. F n) such that only a predetermined amount of force with a predetermined speed of application acts on the piezoelectric modules (M ji,i) such that a predetermined electric power (P out) is supplied by the piezoelectric generator unit; and said input force control device comprising an activation plate for evenly distributing the predetermined force acting on the piezoelectric modules (M ji,i) such that they all receive substantially the same predetermined force, substantially at the same moment and substantially for the same time; and a damping element suitable for damping the dynamic load or force (F 1, F 2.. F n) so as to protect the piezoelectric modules (M ji,i).