# Performance Analysis of Quantum Key Distribution Technology for Power Business
## 1 Introduction
However, its low-key rate limited its application in multi-service scenarios. A QKD networking model was introduced, but only studies the effect of distance on QKD performance [17]. A method of power-securing events and unified meter reading businesses based on QKD was proposed [18]. It provided a secure transmission channel for unified billing information of power, water and gas, but the network was mainly based on BOFC. A multi-point power dispatching quantum key application strategy was proposed, which effectively improved the secure transmission level of the dispatching network. However, it did not take into account the actual operating environment [19; 20]. Article [21] used a local search algorithm to improve the efficiency of MDI-QKD (measurement device independent-quantum key distribution protocol) and designed a quantum key application strategy in a simulation environment to improve the utility of QKD in power dispatching network. For the practical application of QKD technology in power industry, the existing research results have not been systematically verified, and the combination with the existing power business is insufficient [22; 23; 24]. Considering the differences among the attributes of power businesses, each business has different encryption requirements and security requirements. At the same time, power dispatching and control services have extremely high requirements for communication delay and reliability. The real-time requirement of power financial data transmission is less demanded, however, it contains a lot of sensitive information, so the confidentiality requirement of information interaction can be extremely high. Not like text encrypted transmission, video conference involves a large amount of data, as well as higher real-time and synchronization requirements. In complex power environments, rigorous testing and verification are required to verify whether QKD technology can operate safely and stably. Therefore, it is necessary to carry out the performance evaluation of the power quantum secret communication system under the complex grid environment. Based on the urgent needs of power business security, this paper simulates a variety of different power grid operating environments, and the performance of QKD technology in power business has been verified. Meanwhile, it is verified whether the QKD technology can satisfy the business operation indicators of power dispatching, system protection, disaster recovery data and video conference. Meanwhile, in order to improve the security protection ability of power service information interaction, this paper studies the QKD networking in typical business scenarios. The fast polarization feedback technology is adopted to solve the stability problem of overhead power line quantum key encryption. Based on this, it is further combined with business attributes such as grid dispatching, power distribution automation, power information collection and video conference to build a secure and reliable communication network. This paper is organized as follows: the principle of BB84 protocol and QKD is briefly introduced in Section 2. In Section 3, we describe the performance characteristics of power QKD. Several QKD networking schemes are proposed in Section 4. The experimental results of the power QKD system are presented and discussed in Section 5. Finally, the conclusion is summarized.