分布式能源接入电力系统的新型计量系统

Distributed energy power system access new metering system

新能源系统、储能设备等设备接入到电力系统中,电网中的谐波含量大大增加,传统的电能计量系统已经无法满足多能源接入电网的计量需求。分析了影响电能电量计量的各个方面,提出了一种新型计量方案。在运用智能仪表的基础上,特别增加了谐波计量模块,采取先消除谐波,使采样环节不受干扰提高精度,后利用dq坐标系快速而准确地估计出电网电压的谐波。仿真结果验证了该方案能有效估计出谐波值,进而实现了新能源并网时电能的更准确计量。

When new energy systems, energy storage devices, and all client devices are connected to power system, grid harmonic content will increase significantly, and the traditional energy metering system has been unable to meet the needs of multi-energy metering access to the grid. This paper analyzes the impact of various aspects of energy consumption metering, and proposes a new measurement scheme. Based on the use of intelligent instruments, a harmonic metering module is increased in particular. It eliminates harmonics firstly to improve the accuracy of the sampling aspects without disturbance, and then uses dq coordinate system to quickly and accurately estimate the harmonic grid voltage. Simulation results show that the scheme can effectively estimate the harmonic value, thus achieving a more accurate measurement of electricity when new energy is connected to the grid.