中央空调紧急控制应对受端电网直流闭锁故障研究

doi:10.6040/j.issn.1672-3961.0.2019.201

Abstract

Abstract:

The central air conditioner had the potential to cope with the DC blocking fault through emergency control, ensure the safe and stable operation of the receiving-end grid after suffering from large power shortage. The basic principle of the central air conditioner was introduced. On this basis, the physical model of the central air conditioner which included central air conditioning unit, temperature change of frozen inflow and outflow water, heat exchange between the cooling water of the fan coil and the room, indoor average temperature change as well as the proportion of the room in the open state were established. An emergency control strategy for direct power cut and flexible recovery of central air conditioning was proposed. The feasibility of the emergency control of the central air conditioning system in response to stability control and under frequency/voltage load shedding were discussed respectively. The characteristics of the central air conditioning emergency control were simulated. The emergency control of central air conditioner was simulated after HVDC blocking fault occurs in Shandong power grid, verifying that the power grid frequency could be increased by 0.04 Hz when central air conditioners accounted for 1% of the total load in Shandong power grid.

Key words: load control, central air conditioner, emergency control, HVDC, bi-polar block fault

CLC Number:

TM732

Meng LIU,Dingyi CHENG,Wen ZHANG,Hengxu ZHANG,Kuan LI,Guohui ZHANG,Jianjun SU. Discussion on emergency control of central air conditioner at large receiving-end grid to cope with HVDC blocking fault[J].Journal of Shandong University(Engineering Science), 2020, 50(1): 72-81.

Figures/Tables 12

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厂家	单台主机额定功率	单台冷冻泵额定功率	单台冷却泵额定功率	单台室内风机额定功率	单台冷却塔风机额定功率
约克	350~700	20~110	20~110	0.3左右	20
特灵	100~1 000	100左右	100左右	0.1左右	2~10
开利	100~1 000	20~110	20~110	0.1左右	2~10

C_{w, l}/ (W·℃^-1)	C_{w, e}/ (J·℃^-1)	c/ (J·kg^-1·℃^-1)	v/ (kg·s^-1)	K_ex/ (W·℃^-1)	C_air/ (J·℃^-1)	K_air/ (W·℃^-1)
4.96×10⁴	4.96×10⁷	4 200	39.4	6.2×10⁴	1.49×10⁷	4.96×10⁴

Discussion on emergency control of central air conditioner at large receiving-end grid to cope with HVDC blocking fault

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References 35

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城市	螺杆机数量	离心机数量	总数量
济南	104	83	187
青岛	42	69	111
烟台	18	33	51
潍坊	33	20	53
临沂	8	0	8
日照	16	9	25
威海	30	19	49
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