Study on energy storage of regional pipe network system based on time-of-use pricing

doi:10.11949/0438-1157.20191155

Abstract

Abstract:

The regional cooling system is mainly divided into three parts: source, network and users. The pipe network can not only link the source and users, but also realize energy storage. Therefore, the energy storage effect of pipe network can be used to realize the interaction between refrigeration station and power grid. Taking the refrigeration station of a industrial park located in Guangzhou as an example, this paper builds a regional cooling system based on Dymola platform and Modelica language. Based on time-of-use pricing, three control strategies are proposed based on the characteristics of heat storage and delay of pipeline network to explore the application of heat network in power response. Results show that, the effect of the network storage maintained at room temperature is 0.31 h. The use of pipe network heat reduce power consumption by 6.4% and 6.7% of electricity. Visibly network effect is an important resource in power grid demand response.

Key words: district cooling, dynamic simulation, process control, batchwise, network storage, time-of-use pricing

摘要：

区域供冷系统主要分为源、网、用户三部分，其中管网不仅可以作为能量输送环节，还可以实现能量的储存，因此可以利用管网的储能效应实现制冷站与电网的互动。以广东惠州某园区制冷站为例，基于Modelica语言在Dymola平台上搭建了区域供冷系统。基于分时电价，应用管网的储热与延迟特性，提出三种控制策略以探讨热网在电力响应中的应用。仿真结果显示，在案例中管网储热维持室温的效果为0.31 h，利用管网储热能够使供冷系统节省6.4%的电耗和6.7%的电费，可见管网的虚拟储能效应是制冷站参与电网需求响应的重要资源。

关键词: 区域供冷, 动态仿真, 过程控制, 间歇式, 管网储能, 分时电价

CLC Number:

TU 85

Xiaoyu GUO, Zhe TIAN, Jide NIU, Jie ZHU. Study on energy storage of regional pipe network system based on time-of-use pricing[J]. CIESC Journal, 2020, 71(S1): 293-299.

郭晓雨, 田喆, 牛纪德, 祝捷. 基于分时电价的区域管网系统储能应用研究[J]. 化工学报, 2020, 71(S1): 293-299.

Figures/Tables 11

Fig.1 Simplified schematic diagram of network cooling system

Fig.2 Simulation model of network system

Fig.3 Control logics of plan (1), (2), (3)

Fig.4 Outdoor temperature in one summer day

Table 1 Time-of-use pricing of Huizhou

电价时段

价格/

(CNY/(kW·h))

时段

高峰

1.1609

14:00~17:00、19:00~22:00

平段

0.7036

8:00~14:00、17:00~19:00、22:00~24:00

低谷

0.3518

0:00~8:00

Table 2 Information of cooling system equipment

设备名称	设备参数	数量
冷水机组	冷冻水进出水温度：13/6℃；冷却水进出水温度32/37℃；额定制冷量：4610 kW；COP：6.43	4台
冷冻水泵	额定流量2246.4 m³/h	4台
冷却水泵	额定流量3145 m³/h	4台
冷却塔	额定功率38 kW	4台

Fig.5 Topology of network system

Fig.6 Temperature of workshop in three schemes

Fig.7 Temperature signal of three schemes

Fig.8 Electric power of a, b, c schemes

Fig.9 Indoor temperature trigger signal of scheme d

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