A coordinated control method for a distributed compensator, wherein the distributed compensator is composed of converters that are connected to three phases of alternating-current lines in series respectively, the converters that are connected into each phase are formed by multiple modules sequentially connected in series, and the method is characterized in that: during the process of normal operation of the distributed compensator, checking, in real time, the operating state of each module among the multiple modules in the converter of each phase, so as to obtain the first number of modules in each phase, a first number of modules being the number of available modules, which have normal operation conditions and do not have faults, in the converter of each phase; calculating, in real time, a second number of modules, which can effectively output voltages, of the distributed compensator, the second number of modules being equal to the minimum value of the first number of modules in each phase; in a case that a first module of the converter of a first phase has a fault, blocking and bypassing the first module, and in addition, subtracting one from the first number of modules in the first phase, and keeping the first number of modules in a non-fault phase unchanged; and for each of the three phases, comparing the first number of modules in each phase with the second number of modules, and in a case that the first number of modules is greater than the second number of modules, switching a state of a module, which needs to be converted into a hot standby state and which is in a converter of a phase in which the first number of modules is greater than the second number of modules, into the hot standby state; the number of modules whose state need to be switched into the hot standby state, equals to the difference of the first number of modules of the phase where the modules that need to be switched to the hot standby state are located and the second number of modules. during the process of normal operation of the distributed compensator, checking, in real time, the operating state of each module among the multiple modules in the converter of each phase, so as to obtain the first number of modules in each phase, a first number of modules being the number of available modules, which have normal operation conditions and do not have faults, in the converter of each phase; calculating, in real time, a second number of modules, which can effectively output voltages, of the distributed compensator, the second number of modules being equal to the minimum value of the first number of modules in each phase; in a case that a first module of the converter of a first phase has a fault, blocking and bypassing the first module, and in addition, subtracting one from the first number of modules in the first phase, and keeping the first number of modules in a non-fault phase unchanged; and for each of the three phases, comparing the first number of modules in each phase with the second number of modules, and in a case that the first number of modules is greater than the second number of modules, switching a state of a module, which needs to be converted into a hot standby state and which is in a converter of a phase in which the first number of modules is greater than the second number of modules, into the hot standby state; the number of modules whose state need to be switched into the hot standby state, equals to the difference of the first number of modules of the phase where the modules that need to be switched to the hot standby state are located and the second number of modules.