The large population base and rapid growth have many negative impacts. Even if modernization meets people’s material needs, to some extent, it will also lead to problems in the operation of society due to resource exploitation. Therefore, in terms of the thermal power generation used in the past, it has been unable to meet the needs of social operation, and will also cause environmental degradation. In response, the birth of photovoltaic power generation technology has solved the problem of insufficient energy supply in reality, and to some extent reduced the negative impact of environmental degradation. However, this technology is still an emerging technology, and there are still certain issues that need to be addressed. This article mainly discusses the principle and corresponding countermeasures for adjusting the voltage rise at the junction point of a photovoltaic power generation system.
Electric energy is a major resource that must be relied on for the current social operation, so if there is a lack of electricity in the operation of society, it will inevitably have a negative impact. In this regard, in order to ensure stable operation of electric power operation, it is necessary to optimize the application of new technologies, in order to improve the power production capacity. However, the application of new technologies in China still has a phenomenon of technological immaturity, so in order to avoid the occurrence of malpractice issues, it is necessary to achieve control over them, in order to ensure the subsequent development and application of this technology.
1. Application of Photovoltaic Power Generation System and Analysis of Voltage Rise Principle
(1) Application of photovoltaic power generation system
In the application of photovoltaic power generation technology, components need to be made of semiconductor materials, which can enable it to achieve power transmission through the conversion of solar energy in applications. This also makes the photovoltaic power generation system itself not bring environmental pollution issues during the application process, and the overall operational safety is also better than traditional power generation methods. At the same time, because photovoltaic power generation does not have regional limitations, and its own power output is also higher than the effect of traditional technology applications, developing photovoltaic power generation and implementing operations through technological innovation can solve the current problem of insufficient power application in society. However, in terms of the application of photovoltaic power generation technology, even though the technological innovation in recent years has achieved the optimization of photovoltaic power generation technology, in the process of practical application, there are still certain drawbacks in the application of low-voltage distribution networks, which will directly affect the final power output, and also bring certain safety hazards. If it is not possible to effectively resolve this issue, it will inevitably lead to more undesirable issues during subsequent operations. Based on this, in order to avoid the emergence of hidden dangers, it is necessary to comprehensively optimize the application of photovoltaic power generation systems, and start with solving practical problems to achieve comprehensive upgrades.
(2) Principle of voltage rise at grid connection points in photovoltaic power generation systems
Society cannot live without electricity supply, so if we want to meet the needs of social development and operation in electricity supply, we must expand the scope of photovoltaic system applications through grid connection. However, in China, in terms of the construction of power supply systems, the actual configuration used by various operators in power transmission does not actually meet the requirements of photovoltaic systems. Moreover, most operators use single power system operation to achieve voltage conversion during power transmission, so it is difficult to achieve effective voltage control in this form of power transmission that cannot complete reverse current changes. At the same time, for photovoltaic power generation, the common application method is to use isolated step-up voltage to achieve the use of transformers. This way, through intervention, it can achieve the transfer of high voltage to the medium voltage distribution network, or even directly transfer to the low voltage network for application, generating the effect of voltage rise during grid connection. To ensure that photovoltaic power generation can be widely promoted and applied, it is necessary to address practical issues.
2. The Principle and Strategy of Adjusting the Voltage Rise at the Parallel Point of a Photovoltaic Power Generation System
(1) Active current power supply
For the application of photovoltaic power generation systems, it is necessary to focus on the active current and voltage during the process of adjusting the voltage rise at the junction point. After all, active current and voltage are not only the key to achieving voltage rise control, but also directly affect the economic benefits of contractors and operators in their applications. Generally speaking, PCC voltage is an important value that can be used to measure whether a photovoltaic power generation system has an ability to confirm whether it exceeds the controllable range when the voltage at the grid point increases. Therefore, if the value exceeds a reasonable range during the application process, it will inevitably lead to the overall capacitance of the entire grid point being under overload [3]. In this case, it often directly leads to the unstable operation of the entire photovoltaic power generation system. In addition, for photovoltaic power generation systems, if the active current and voltage are to be regulated to ensure that the voltage can form a regular waveform during the implementation of voltage regulation at the grid connection point, it is necessary to achieve optimal numerical control to ensure that the PCC can always change within the allowable range, thereby avoiding the occurrence of drawbacks.
Generally speaking, the main reason why the PCC voltage rise cannot be effectively controlled during the current grid connection operation of power generation systems in China is that there are a large number of high-power issues when connecting large capacity power generation systems to the grid. At this time, when conducting low voltage or medium voltage transfer, there will inevitably be drawbacks. In order to achieve control in active current and voltage regulation, the most important point is to ensure that the output power can be reduced during direct conversion of PCC voltage, in order to achieve control effects. In addition, in order to truly control the active current, it is also necessary to achieve the stability of its waveform, so that the voltage can always be regulated, in order to ensure operation.
(2) Reactive current power supply
If you want to control the voltage of a photovoltaic power generation system, you can also handle it by adjusting the reactive current and voltage. Generally speaking, during the control work of reactive current power supply adjustment, a dual second-order universal integrator can be used, which can automatically measure the voltage at any time and be reflected through data application. At the same time, for voltage control, the specific floating value is actually the key data to determine whether the voltage can be controlled. Therefore, by using scientific testing to confirm its value, reactive power compensation can be achieved through precise adjustment, thereby effectively controlling the dynamic accuracy of the PCC. It is worth noting that due to the complexity of this method in the actual operation process and the volatility of changes without power changes, if effective application of data cannot be achieved at this time, it will inevitably lead to the inability to achieve control within a reasonable range during data adjustment. Based on this, in strategic applications, if the PCC voltage exceeds the expected range, during the regulation work, it is necessary to absorb a certain amount of reactive power from the grid to achieve voltage control, so as to reduce the voltage back to the standard range.
Summary
The application of electric energy can promote the development of society, so if the supply of electric energy cannot be guaranteed, it will inevitably affect the operation of society. Therefore, in the current stage, photovoltaic power generation systems that are pollution-free and stable in transportation can truly meet the needs of social operation, and can also promote social development with their advantages, which requires ensuring the effectiveness of their applications.
