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Voltage control method for power distribution network with energy storage

A voltage control method and distribution network technology, applied in the direction of AC network voltage adjustment, energy storage, AC network load balancing, etc., can solve problems such as cost increase, regulation voltage limit, and limited capacity of photovoltaic inverters, and achieve improved stability Effects on Sex and Reliability

Pending Publication Date: 2021-12-17
STATE GRID ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems: adding reactive power compensation devices will cause a large number of harmonics in the distribution network; the capacity of photovoltaic inverters is limited, and the regulation voltage will be limited; adding energy storage devices will lead to increased costs

Method used

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  • Voltage control method for power distribution network with energy storage
  • Voltage control method for power distribution network with energy storage
  • Voltage control method for power distribution network with energy storage

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] figure 1 Shown is an architecture diagram of an energy storage connected to a photovoltaic distribution network according to an embodiment of the present invention. As shown in the figure, there are 33 busbars, some of which contain a photovoltaic system and an energy storage access point. The power output by the power supply and the distributed photovoltaic system flows along the line, and the voltage continues to decrease as the line increases, so 18 The voltage at bus No. 18 is the lowest, and the voltage at bus No. 18 at the end of the line can be measured first. This distribution network contains a large number of distributed photovoltaic systems, and a large number of distributed photovoltaic grid-connected is the main reason for the voltage limit of the low-voltage distribution network.

[0048] figure 2 Shown is a method of u...

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Abstract

The invention discloses a voltage control method for a power distribution network with energy storage. The method comprises the steps of measuring node voltage of a power distribution network, performing power control on inverters when the measured voltage exceeds a limit, enabling the utilization rates of the inverters to be the same by taking the utilization rates of the inverters as a consistency target, and adjusting the voltage according to the power of the inverters; and if the voltage is still not within a safety threshold or the standby capacity of the inverter is insufficient, entering charge and discharge power control of energy storage, and controlling the charge and discharge rate in combination with the consistency target of the utilization rate of the energy storage battery and SoC local information until the node voltage reaches the safety threshold range. According to the voltage control method for the power distribution network with energy storage, the power regulation of the inverters and the charging and discharging power control of the energy storage are combined, and the consistency target is combined, so that each inverter and the energy storage are discharged in a balanced manner, the node voltage of the power distribution network system is ensured to be within a safety threshold, and the operation reliability and safety of the power distribution network system are improved.

Description

technical field [0001] The invention belongs to the field of voltage control of a distribution network that is connected to energy storage and includes a large number of distributed photovoltaic systems, and in particular relates to a voltage control method of a distribution network including energy storage. Background technique [0002] In response to the problem of energy depletion, the penetration rate of distributed power is gradually increasing. Among them, under the trend of rapid development of photovoltaic power generation technology, the cost of photovoltaic power generation has been greatly reduced, and the installed capacity of photovoltaic power generation in the power system has become more and more important. The impact of distributed photovoltaic access on power quality is mainly reflected in voltage limit, voltage flicker, harmonics and relay protection problems, which will have an adverse impact on the operation of the distribution network. Voltage stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/12H02J3/48H02J3/50
CPCH02J3/32H02J3/12H02J3/48H02J3/50Y02E70/30
Inventor 唐成虹陈永华李淑锋王方胜余良辉李渊郑涛李吉平傅金洲王智
Owner STATE GRID ELECTRIC POWER RES INST
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