Is there a balance node in the power system design?

Balance node is a virtual concept, which is used to ensure the convergence of power flow calculation. When there are active and reactive power gaps in power flow calculation, the balance node can send or absorb the gaps, maintain the stability of system voltage and frequency, and indirectly ensure the convergence of power flow calculation results. The real FM power plant can be regarded as a balanced node, but there is no such node in the actual power system.