High-voltage power transmission in China: A long-distance relationship cooling off | IHS Markit
(High voltage Direct Current) technology and high voltage power transmission technology in China. Along with the major policy of China, “①West to east power . other benefits of direct current links. HVDC allows power transmission between. An abundance of high-voltage DC makes big AC grids unstable. Photo: China Southern Power Grid Eastward-Flowing Power: Hydropower Solid-state conversion between AC and DC has enabled high-voltage direct current In July, CSG neutralized this threat by shutting off Yunnan's AC links to the. State Electricity Regulatory Commission · China Atomic China National Nuclear Corporation · Power companies of China.
The lines themselves are underperforming, and more recent projects are coming online amid a period of electricity generation overcapacity.
China’s giant transmission grid could be the key to cutting climate emissions
This means that approvals for new lines have slowed, and grid companies are unlikely to meet their targets for new ones. Enlarge map for more detail.
The benefit of UHV lines is that they have dramatically reduced losses. China has deployed two types of UHV line.
Direct current UHVDC lines suit transmission from A to B over distances of more than 1, kilometres; whereas alternating current UHVAC lines work better over slightly shorter distances but permit branching links along the way.
But rollouts have slowed, and few analysts expect State Grid will deliver on its target.
Ultra-high-voltage electricity transmission in China - Wikipedia
But officials worry about nationwide blackouts cascading across these interconnected grids. Meanwhile, the economic case for new UHVDC lines from the interior has weakened amidst slowing growth in electricity demand. National demand growth averaged Pervasive overcapacity means less need for new transmission projects.
Unsurprisingly, then, approvals for new UHV projects — which take years to construct — have been slow, with just one project approved inand two in Local tensions Certain regional governments targeted for UHV projects have also been sceptical.
Provinces get larger boosts to gross domestic product GDPemployment, and revenue from building their own power plants rather than importing power from other provinces. Even new lines with central government backing have sometimes failed to get provincial acceptance. But as NEA officials noted last autumn, Jiangxi does not want this power.
Sparks fly over ultra-high voltage power lines
The province is bringing more coal-fired power plants online in so wants to delay the new line until after Hubei province is also reluctant to accept long-debated new lines from north-west China.
Disappointing gains Grid companies have their own reasons for being cautious about new UHV lines. Revenues from these mega-projects depend on the amount of power they can transmit. But utilisation of existing lines has been lower than expectedwith non-hydro lines performing particularly badly. The company initially developed and built ultra-high-voltage lines to meet the swelling energy appetites across the sprawling nation, where high mountains and vast distances separate population centers from coal, hydroelectric, wind, and solar resources.
But now State Grid is pursuing a far more ambitious goal: These massive networks could help slash climate emissions by enabling fluctuating renewable sources like wind and solar to generate a far larger share of the electricity used by these countries.China overhauls major power transmission line
The longer, higher-capacity lines make it possible to balance out the dimming sun in one time zone with, say, wind, hydroelectric, or geothermal energy several zones away.
Politics and bureaucracy have stymied the deployment of such immense, modern power grids in much of the world.
In the United States, it can take more than a decade to secure the necessary approvals for the towers, wires, and underground tubes that cut across swaths of federal, national, state, county, and private lands—on the rare occasion when they get approved at all. State Grid is already the biggest power distributor in Brazil, where it built its first and still only overseas ultra-high-voltage line. The company has also snapped up stakes in national transmission companies in Australia, Greece, Italy, the Philippines, and Portugal.
A electrician stands in front of a State Grid branch in China's Hunan province in That regulatory unbundling was designed to introduce competition and accelerate development as the nation struggled to meet rising energy demands and halt recurrent blackouts.
Liu, a savvy operator with a talent for navigating party politics, almost immediately began to lobby hard for ultra-high-voltage projects, according to Sinews of Power: From the start, critics asserted that State Grid was pushing ultra-high-voltage transmission primarily as a means of consolidating its dominant position, or that the new technology was an expensive and risky way of shoring up rickety energy infrastructure.
But it quickly assimilated the expertise of its partners and began developing its own technologyincluding high-voltage transformers as well as lines that can function at very high altitudes and very low temperatures. State Grid has also developed software that can precisely control the voltage and frequency arriving at destination points throughout the network, enabling the system to react rapidly and automatically to shifting levels of supply and demand.
- Ultra-high-voltage electricity transmission in China
- High-voltage power transmission in China: A long-distance relationship cooling off
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