# A Review of Distribution Grid Consumption Strategies Containing Distributed Photovoltaics
## 3 Distribution Grid Consumption Strategy with Distributed PV
### Voltage Control Strategies for Distribution Grids Containing Distributed Photovoltaics
#### 3.3.2 Voltage Coordination Control Methods
Some authors have utilized this similar horizontal zoning approach to propose a network partitioning and voltage coordination control method for distributed PV distribution networks containing high penetration [110], improving the electrical distance and intra- and inter-zone coupling metrics to achieve optimal zoning. Subsequently, voltage optimization is carried out with the objectives of node voltage deviation and network loss. Other authors utilize controllers for information transfer, and partitions are randomly divided into a number of them to solve the voltage overrun problem by adopting a cluster voltage control strategy to autonomously regulate the reactive power output from the distributed PV inverters while considering the scenario of communication deficiency [111]. Directions for future work on the voltage control strategy include further optimizing the design of the control system to improve the response speed and accuracy, exploring more intelligent and adaptive voltage control strategies to cope with complex and changing grid environments, and carrying out large-scale empirical studies to verify the effectiveness and feasibility of the strategy. The above are some of the results of voltage control strategies by Chinese researchers; worldwide, voltage control strategies have been studied by a considerable number of people. [PERSON] et al. proposed a robust decentralized voltage control strategy for remote microgrid systems [112], and overall, the proposed AFPID controller in this strategy  
Figure 12: Schematic diagram of IEEE33 node test system. performs better than the other methods in distributed voltage control. The literature [113] proposed an adaptive power ramp rate control method for photovoltaic (PV) power generation systems, which achieves fast dynamics and low power oscillation by adaptively calculating voltage steps. Experimental and simulation results confirm the performance of the method in various operating environments, and the method can be applied to large-scale PV power plants. The literature [114] designed a low-voltage ride-through control strategy for a solar PV grid-connected inverter; this scheme minimizes the harmonic and reactive power injected into the grid and also reduces the voltage oscillations at the DC bus. In addition, this control strategy provides dynamic control of active and reactive power. In order to solve the problems of voltage fluctuations and voltage losses due to intermittent solar energy, [PERSON] et al. from India proposed a new local dynamic sag control strategy for providing reactive auxiliary support ports using decentralized [115]. Combined with a meta-heuristic reptile search algorithm technique, it greatly improves the rationality of the system voltage distribution and fully utilizes the capacity of the PV inverter. [PERSON] et al., also in India, illustrated how to efficiently regulate higher-order sliding mode controllers in PV systems [116], and the proposed HOSM control strategy outperforms the conventional PI control technique in a perturbed environment, thus allowing the PV system to provide constant voltage to the power line. The literature [117] proposed an adaptive control framework for the flexible and effective management and control of clustered DC nanonetworks in islanded DC microgrid systems, where the adaptive model predicts the controller to provide better transient response and less current ripple. [PERSON] et al. from the USA proposed a novel transformerless grid-connected inverter based on a switched capacitor [118]. The boosting capability was obtained by utilizing the series-parallel switching technique of switched capacitor modules. Higher overall efficiency and leakage current elimination capability were obtained by the common ground technique. French scholars [PERSON] et al. comparatively analyzed the equivalent circuits of two non-isolated Buck/Buck-Boost converters under synchronous control and applied them to a stand-alone PV battery-loaded system [119].