电力载波多联机空调通信系统的设计与开发

为了降低多联机空调系统的成本、简化安装工程，采用电力线载波通信技术构建了多联机空调的通信系统。首先根据系统控制的通信需求提出了基于窄带电力线通信技术的解决方案；然后主要从信道接入控制和组网控制两方面设计了包括物理层、介质访问控制（MAC）层、网络层和应用层的四层通信协议集，提出了基于载波侦听多路访问/冲突避让（CSMA/CA）设计思想的三种信道接入算法以及星型网络拓扑的组网算法；最后对11节点多联机空调系统进行了组网测试、正常通信测试和抗干扰测试。测试结果表明所提算法及方案能够满足多联机空调系统的实时控制要求，并具有较强的抗干扰能力；另外，所设计的通信协议具有开放性，可以根据需求进行修改，应用于智能家居等短距离无中继的实时控制领域。

Design and development of power line carrier communication system for variable refrigerant volume air-conditioning systems

In order to reduce the cost and simplify the installation of Variable Refrigerant Volume (VRV) air-conditioning system, a communication system was constructed based on Power Line Carrier Communication (PLCC) technology. First, a solution based on narrowband PLCC technology was proposed according to the communication requirement of the system control. Then, the four-layer communication protocol including physical layer, Medium Access Control (MAC) layer, network layer and application layer was designed mainly from two aspects of channel access control and networking control. Three kinds of channel access algorithms based on CSMA/CA (Carrier Sense Multiple Access with Collsion Avoidance) design idea and a kind of network algorithm for star network topology were put forward. Last, the networking test, system communication test and anti-disturbance test for a 11-node VRV system were given. The test results show that the proposed algorithms and solution can satisfy the real-time control of VRV system and has strong ability of anti-disturbance. In addition, with the openness of the designed communication protocol, it can be modified according to different requirements and be applied to a variety of real-time control areas in short distance without relay such as smart home.